# Principles of Sailing

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 Principles of Sailing This is a PowerPoint set of charts presented by Demetri Telionis on March 21, 2015 at the Yacht Club of Hilton Head Island. The aim of this presentation was to help the audience understand the physical principles of sail aerodynamics, and hull/centerboard fluid mechanics. Most of the graphs in this presentation were taken from Sailing Theory and Practice by C.A.Marchaj, published by Dodd, Mead & Company

2 l Definition of basic components found on a sailboat

3 Concentrated Forces The action of two forces is equivalent to the action of their resultant The resultant is the diagonal of a rectangle Forces are vectors. They possess magnitude and direction Forces can be concentrated at a point

4 Distributed Forces Consider 10 lb of water in tank with 5 X6 base The force is distributed over 30 square inches The distributed load 10 lb/ 30 in 2 = 0.33 psi Force distributed over an area we call pressure

5 Two basic laws of fluid mechanics LAW 1. Continuity A 1 V 1 = A 2 V 2 = constant Velocity (feet per second) TIMES area (square feet) = volume flow rate(cubic feet per second) This law indicates that if as we move into the tube the area decreases, then the velocity increases, so that the product stays the same This holds for flow through a pipe, or just between any two streamlines in the flow

6 Two basic laws of fluid mechanics LAW 2. Bernoulli s law P 1 + ρv 12 /2= constant (Here ρ is the density of the fluid) Pressure plus.(almost) velocity squared = constant This law indicates that if along a stream, the velocity increases, then the pressure decreases

7 Pressure and velocity vary when fluid moves over a solid surface The surface could be the hull of a boat, or a sail Here pressure can be measured by manometers Look for areas of low pressure over the solid surface

8 Air Flow over a Wing at Incidence The pressures that develop result in net forces in the vertical and horizontal direction Where the streamlines bunch together, the velocity increases, and then Bernoulli dictates that the pressure decreases. This generates suction on the upper surface and compression on the lower. F L : Lift F D : Drag

9 Flow over a Flat Plate This could be the boat center board, the keel or the rudder No incidence generates no side force(no lift) As the incidence angle increases Lift is generated, but also drag. As incidence increases, drag increases faster than lift.

10 Adjusting the shape of a wing or a sail affects the net aerodynamic force Mechanical devices can change the shape of a wing Adjustments can be made to change the shape of a sail

11 Flaps increase lift and drag Flaps increase lift (needed when landing at low speeds) But flaps increase much more drag ( also needed when landing)

12 Forces on Sails The wind generates pressure over the sail. Pressure acts normal to a surface Negative pressure (suction) develops on the lee side of a sail Positive pressure develops on the windward side Gage pressure= local pressure atmospheric pressure The resultant of all these pressures, F T exerted on the sail is transferred to the boat

13 Add a boat to the sail F H : Healing Force F R : Driving Force F T : Total Force STARBOARD PORT When the wind is on the port side: PORT TACK

14 Forces on a sailboat Forces on center board: F D : Drag F L : Lift Forces on boat (sail and center board) balance each other The boat is in equilibrium In the situation depicted, the boat is moving at an angle of α B with respect to its axis

15 Forces on the sail

16 Forces exerted on boat Newton s first law: At constant body speed, all forces are balanced

17 Skipper is pointing North β You see the mark dead North You are on a clean windward leg You decide to look only at your compass You keep your boat pointing North Where will you be at the end?

18 Skipper is pointing at mark If you steer towards the mark, your boat does not move towards the mark If you keep steering towards the mark, then your trajectory is a curve.

19 If we increase the angle of incidence to the sail the flow separates close to the luff of the sail, The sail stalls and the suction on its less side is reduced.

20 A well-trimmed sail should have the flow hugging the sail on both sides. At higher incidences, the flow separates on the lee side as detected by the flapping of the streamers. At low incidence the flow separates on the windward side, and the streamers on that side flap around. Trim the sail and steer the boat so that your jib is in condition 2.

21 Sail Interaction The jib directs a stream on the lee side of the main. This increases velocity and thus lowers pressure, which further enhances the main s performance

22 Velocity distribution over an object If a wind is approaching an object say at 60 mph, or equivalently if the object is moving at a speed of 60 mph with no atmospheric wind present, then the body distorts the flow around it. In other words, if you stick your hand through the sunroof, you will feel a speed much higher than 60 mph. ( Just see the bunching up of the streamlines)

23 Apparent or Relative Wind No head wind Car moving at 60 mph Apparent wind is 60 mph 60 mph Head wind of 30 mph 30 mph 60 mph Now apparent wind is 60 mph + 30 mph = 90 mph 30 mph 60 mph

24 Apparent wind Boat velocity and wind velocity are not aligned The apparent wind strength and direction is what your telltales tell you and what you feel when you are in the sailboat

25 POINTS OF SAIL Closed-hauled Windward Reaching Broad Reach Downwind AR = Aspect Ratio: Approximately: Height over base: AR = h/b h b

26 Aspect ratio of sails High aspect ratio sails are more efficient close to the wind Felucca on the Nile My J22

27 Pointing to windward Close-hauled a boat can sail at about 45 degrees upwind

28 This is an imaginary ladder with its steps normal to the wind direction. If two boats are on the same step of a ladder, then their sailing distance to the mark is the same The wind ladder Direct distance versus sailing distance Direct distance: A to Mark: 1,000 B to Mark: 1,400 Sailing distance: For both: 1,400

29 Different options of sailing to windward No matter what courses are followed, the sailing distances of A to the mark and B are the same But each tack slows you done some.

30 Boats merge on lay line near the mark The dashed lines drawn from the windward mark at an angle of 45 degrees to the wind are called the lay lines AVOID CROSSING THE LAY LINE!!!!! Because then your sailing distance is increased.

31 line must be a ladder step

32 If the wind direction changes, a boat may find itself on a higher or a lower step (the boats indicated on this graph were left over from the previous chart and are irrelevant to the above statement) To observe this effect, go to the previous chart, touch the screen at point say on step 200, and keep it there, then move on to this chart an see where your finger will find itself with the shift of the wind.

33 Starting line not along a ladder step If the starting line is not aligned with a ladder step, then one side is more favorable than the other. In the case depicted here, starting on the left, you will be on step 200, while a competitor starting on the right will be on step 100.

34 Dead Air Region Flow Visualization Wind Tunnel Downstream of a lifting surface at high incidence, or downstream of any object, like a building, a region develops with almost zero velocity. This is called the dead-air or dead wind region. In sailing we sometimes refer to this region as the shadow of the boat to our windward.

35 Wind shadow The dead wind region of a closed-hauled sail is limited. But a sail presenting its full shape to the wind, as is the case in a downwind leg is significant.

36 If you are astern of one or more boats, you should anticipate that you could find yourself in the deadwind region of another boat, or in a region where the wind is deflected against you, and thus will require you to point lower than the competitor. Get out of there as soon as possible.

37 The sails disturb the flow all around It is not only the wind shadow that hurts you. It is also the direction of the disturbed wind that will force you to point lower

38 Wind tunnel measurements of disturbance expressed as a percentage of undisturbed-wind sailing

39 Spinnaker Rigging

40 Downwind The aerodynamics of sails downwind Entirely different principles A spinnaker is essentially a parachute A spinnaker/main wind shadow is much broader

41 Spinnaker in Reaching

42 Reaching with Spinnaker Freeing the clew of the spinnaker will make it work like a big genoa, and thus increase the forward force generated by the spinnaker

43 Jibing the spinnaker The pole must be disconnected, and while the main is jibed, the pole must be connected on the other side, thus the old clew now becomes the tack

### THE 21 st CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, MARCH 2013

THE 21 st CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, MARCH 2013 A wind tunnel study of the interaction between two sailing yachts P.J. Richards, D.J. Le Pelley, D. Jowett, J. Little, O. Detlefsen

### Section V Sailing off the wind

Section V Sailing off the wind 1 Sail shapes and flow patterns - off the wind a) Principles When reaching, it is maximum thrust which is important, and here the leech ribbons come into their own. Fig.43a

### Now we get to the really fun part of cat sailing, but first you need to know about apparent wind.

Shelley Sailing Club Inc. Notes for informal catamaran training course, Alec Duncan, 14/3/2015 Part 4: Reaching and running Now we get to the really fun part of cat sailing, but first you need to know

### CASE STUDY FOR USE WITH SECTION B

GCE A level 135/01-B PHYSICS ASSESSMENT UNIT PH5 A.M. THURSDAY, 0 June 013 CASE STUDY FOR USE WITH SECTION B Examination copy To be given out at the start of the examination. The pre-release copy must

### Melges 24 Sailing Guide

RACING GUIDES www.ullmansails.com Upwind Sailing Melges 24 Sailing Guide The Melges is most efficient when sailed as flat as possible. Excessive heel causes leeway which is slow. The skipper must work

### BoatWorks. (An Illustrated Sailing Primer) Table of Contents: 1. Basic Sailing Terminology: Boat Related Wind Related Other key terms

BoatWorks (An Illustrated Sailing Primer) Table of Contents: 1. Basic Sailing Terminology: Boat Related Wind Related Other key terms 2. Sailing Basics: Points of Sail The Wind The Boat The Sails 3. Crew

Navigation with Leeway Leeway, as we shall use the term, means how much a vessel is pushed downwind of its intended course when navigating in the presence of wind. To varying extents, knowledge of this

### National Maritime Center

National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 8 Choose the best answer to the following Multiple Choice Questions. 1. In illustration D001SL, what is the edge

### THE INTERACTION BETWEEN SAILING YACHTS IN FLEET AND MATCH RACING SITUATIONS

THE INTERACTION BETWEEN SAILING YACHTS IN FLEET AND MATCH RACING SITUATIONS P.J. Richards, Yacht Research Unit, University of Auckland, New Zealand N. Aubin, École Navale, France D.J. Le Pelley, Yacht

### Mental Calisthenics (22)

Mental Calisthenics (22) Patient s Name: Date: 1 Basic Nautical Terms Read the nautical terms below: 1. Aft - The back of a ship. If something is located aft, it is at the back of the sailboat. The aft

### Detailed study 3.4 Topic Test Investigations: Flight

Name: Billanook College Detailed study 3.4 Topic Test Investigations: Flight Ivanhoe Girls Grammar School Questions 1 and 2 relate to the information shown in the diagram in Figure 1. z Question 1 y Figure

### PRE-START DO S AND DONT S by Dave Perry

PRE-START S AND NT S by Dave Perry September, 2009 p. 2 of 5 Three Phases of the Pre-Start Some General Do s and Don t s The Entry One minute loops max in final 2:00 Tactician say we re in Blue say your

### GLOSSARY Of SAILING TERMS

GLOSSARY Of SAILING TERMS Aback With the wind on the wrong side of the sails. Abaft Behind an object in relation to the bow. Abeam At approximately right angles to the foreandaft line of the boat. Advantageous

### Bernoulli's Principle

Bernoulli's Principle Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. Introduction The Bernoulli's Principle explains the behavior of

### E Scow Racing and Rigging Manual

E Scow Racing and Rigging Manual Written by Mark Ehlers Editing and content revisions by Andrew Bartling Aspects of Sailing E Scows Crew weight should never exceed 675lbs. The target weight for 4 people

### OASIS SAILING CLUB. A&E Review Form Sailing/CQM Rev 11/9/2015. Name: Level

OASIS SAILING CLUB A&E Review Form Sailing/CQM Rev 11/9/2015 Name: Level Vessel: A&E Reviews are designed to improve general competence and safe sailing of OSC vessels. The written multiple-choice tests

### HIGHLANDER TUNING GUIDE

HIGHLANDER TUNING GUIDE This document provides information on preparation, Quantum s sail tuning and technique, and other helpful tips to make sure you re ready to meet your challenge in today s competitive

### NORTH SAILS FAST COURSE MAINSAIL

NORTH SAILS FAST COURSE MAINSAIL Contents: Introduction. Step 1 Set twist with mainsheet tension. Step 2 Set depth with mast bend and outhaul tension. Step 3 Set draft position with luff tension. Step

### 1. A tendency to roll or heel when turning (a known and typically constant disturbance) 2. Motion induced by surface waves of certain frequencies.

Department of Mechanical Engineering Massachusetts Institute of Technology 2.14 Analysis and Design of Feedback Control Systems Fall 2004 October 21, 2004 Case Study on Ship Roll Control Problem Statement:

### How to Pick the Favored End by David Dellenbaugh

How to Pick the Favored End by David Dellenbaugh Race committees usually try to set their finish lines square to the wind direction, but windshifts and other factors often skew the line and favor one end.

### Wind Light Moderate Heavy Speed 0-8 mph 9-17 mph 18 + mph

Hobie 20 Racing Setting - Compiled by Bob Mimlitch, Fleet 23, Dallas, TX Most of the information is from Bob Curry's articles in Catamaran Sailor published by Mary Wells. Wind Light Moderate Heavy Speed

### J/70 Tuning Guide. For any question you may have on tuning your J/70 for speed, contact our experts:

Photo Paul Todd/OUTSIDE IMAGES For any question you may have on tuning your J/70 for speed, contact our experts: Tim Healy 401-683-7997 tim.healy@northsails.com Will Welles 401-683-7997 will.welles@northsails.com

### The Definite Guide to Optimist Trim

The Definite Guide to Optimist Trim by Martin Gahmberg & the WB-Sails team The purpose of this tuning guide is to help you trim your WB sail optimally by learning the effects of the controls: How to change

### CSC Learn to Sail Class

CSC Learn to Sail Class JUNE 2014 Pedram Leilabady LNYC Nomenclature Sailors Lingo! Direc@ons Ahead Astern 1 6/3/14 Main Parts Mainsail Jib Sails / Spars Head Mast Head Leech Luﬀ Leech Luﬀ Mainsail Clew

### AEROSPACE MICRO-LESSON

AIAA Easily digestible Aerospace Principles revealed for K-12 Students and Educators. These lessons will be sent on a bi-weekly basis and allow grade-level focused learning. - AIAA STEM K-12 Committee.

### Optimist Tuning Guide

Optimist Tuning Guide Sail Care: To help you re new racing sail stay in top condition as long as possible here is some tips - Try not to crease your sail, some creases can cause MIT tears in your sail

### Applications of Bernoulli s principle. Principle states that areas with faster moving fluids will experience less pressure

Applications of Bernoulli s principle Principle states that areas with faster moving fluids will experience less pressure Artery o When blood flows through narrower regions of arteries, the speed increases

### Sail Trimming Guide for the Beneteau 40

INTERNATIONAL DESIGN AND TECHNICAL OFFICE Sail Trimming Guide for the Beneteau 40 October 2007 Neil Pryde Sails International 1681 Barnum Avenue Stratford, CONN 06614 Phone: 203-375-2626 Fax: 203-375-2627

### Basic Keelboat Sailing Standard (ASA 101)

Basic Keelboat Sailing Standard (ASA 101) Prerequisites: None General Description: Description: Demonstrated ability to skipper a sloop-rigged keelboat of approximately 20 to 27 feet in length by day in

### CC Scouts SA. Leader Notes. Cub Sailing

CC Scouts SA Leader Notes Cub Sailing Welcome to Cub Sailing at Glenelg Adventurous Activity Centre Dear Cub Leader, We are very pleased to offer you cub sailing at Glenelg. You can book this activity

### PRE-TEST Module 2 The Principles of Flight Units /60 points

PRE-TEST Module 2 The Principles of Flight Units 1-2-3.../60 points 1 Answer the following questions. (20 p.) moving the plane (4) upward / forward. Opposed to that is 1. What are the names of the four

### ANGEL INSTRUCTIONS ALMOST READY TO SAIL MODEL YACHT

ANGEL INSTRUCTIONS ALMOST READY TO SAIL MODEL YACHT Long: 920mm High:1840mm Toatl sail area: 0.4 m2 1 MODEL YACHT ASSEMBLY INSTRUCTIONS & SAILING HINTS Thank you for purchasing one of our range of model

2 Table of Contents If you have questions about operating or installing your new Megatech product, or if you are missing parts... Please Call Megatech First! DO NOT RETURN THIS PRODUCT TO THE STORE Call

### Sail Trimming Guide for the Beneteau 373

INTERNATIONAL DESIGN AND TECHNICAL OFFICE Sail Trimming Guide for the Beneteau 373 March 2004 Neil Pryde Sails International 354 Woodmont Road #18 Milford, CT 06460 Phone: 203-874-6984 Fax: 203-877-7014

### Bluenose Class Jib Trim by: Andreas Josenhans (North Sails Atlantic)

Bluenose Class Jib Trim by: Andreas Josenhans (North Sails Atlantic) The current Bluenose Jib has been unchanged from 2006-2015. Over the years, a Bluenose headsail was changed to achieve the following.

### ConcepTest PowerPoints

ConcepTest PowerPoints Chapter 10 Physics: Principles with Applications, 6 th edition Giancoli 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for

### TUNE YOUR SAILS SPEED. Optimist Tuning Guide. Photo Wavelength

TUNE YOUR SAILS FOR OUTRIGHT SPEED Photo Wavelength PEAK / HEAD THROAT TACK CLEW THANK YOU for choosing North Sails for your Optimist. Whether you are just starting out in an Optimist you are an experienced

### AERODYNAMIC CHARACTERISTICS OF SPIN PHENOMENON FOR DELTA WING

ICAS 2002 CONGRESS AERODYNAMIC CHARACTERISTICS OF SPIN PHENOMENON FOR DELTA WING Yoshiaki NAKAMURA (nakamura@nuae.nagoya-u.ac.jp) Takafumi YAMADA (yamada@nuae.nagoya-u.ac.jp) Department of Aerospace Engineering,

### SAILING STRATEGY. Sailing Club of Washington February 15, 2017

SAILING STRATEGY Sailing Club of Washington February 15, 2017 TOPICS FOR DISCUSSION Strategy vs. Tactics Winning Before the Race Begins How to diagnose a Race Course The Start The First Beat The Run Common

### L 15 Fluids [4] The Venturi Meter. Bernoulli s principle WIND. Basic principles of fluid motion. Why does a roof blow off in high winds?

Basic principles of fluid motion L 15 Fluids [4] >Fluid flow and Bernoulli s s principle >Airplanes and curveballs >viscosity (real fluids) v 1 Continuity equation: v A = constant A 1 A 2 v 2 Bernoulli

### Franckh-Kosmos Verlags-GmbH & Co. KG, Pfizerstr. 5-7, Stuttgart, Germany +49 (0) Thames & Kosmos, 301 Friendship St.

Franckh-Kosmos Verlags-GmbH & Co. KG, Pfizerstr. 5-7, 704 Stuttgart, Germany +49 (0) 7 29-0 www.kosmos.de Thames & Kosmos, 30 Friendship St., Providence, RI, 02903, USA -00-57-272 www.thamesandkosmos.com

### Homework Exercise to prepare for Class #2.

Homework Exercise to prepare for Class #2. Answer these on notebook paper then correct or improve your answers (using another color) by referring to the answer sheet. 1. Identify the major components depicted

### A Different Approach to Teaching Engine-Out Glides

A ifferent Approach to Teaching Engine-Out Glides es Glatt, Ph., ATP/CFI-AI, AGI/IGI When student pilots begin to learn about emergency procedures, the concept of the engine-out glide is introduced. The

### ETCHELLS RIG SET UP FOR PC-M/PC+/BF MAIN, DC270/GM JIBS,.5oz VMG, FULL RADIAL and.5oz/.75oz BIRADIAL SPINNAKERS

ETCHELLS RIG SET UP FOR PC-M/PC+/BF MAIN, DC270/GM JIBS,.5oz VMG, FULL RADIAL and.5oz/.75oz BIRADIAL SPINNAKERS 1. MAST STEP Jan 2008 5.360mtrs measured from the transom/deck intersection to the aft edge

### Instruction Manual. Features. Specification: Length: 730mm Width: 500mm Height: 1000mm Sail Area: 0.15m 2. Weight: 692g (w/o battery & receiver)

AN UNBELIEVABLE SPEED MACHINE Instruction Manual Features Specification: Length: 730mm Width: 500mm Height: 1000mm Sail Area: 0.15m 2 Weight: 692g (w/o battery & receiver) Thank you for purchasing your

### A103 AERODYNAMIC PRINCIPLES

A103 AERODYNAMIC PRINCIPLES References: FAA-H-8083-25A, Pilot s Handbook of Aeronautical Knowledge, Chapter 3 (pgs 4-10) and Chapter 4 (pgs 1-39) OBJECTIVE: Students will understand the fundamental aerodynamic

### Chapter 2 Hydrostatics and Control

Chapter 2 Hydrostatics and Control Abstract A submarine must conform to Archimedes Principle, which states that a body immersed in a fluid has an upward force on it (buoyancy) equal to the weight of the

### North Sails Seattle Thunderbird Tuning Guide

Page 1 of 6 North Sails Seattle Thunderbird Tuning Guide Introduction The following tuning guide is meant as a good starting point in setting up your boat. Since not all Thunderbirds are exactly alike

### Jet Propulsion. Lecture-17. Ujjwal K Saha, Ph. D. Department of Mechanical Engineering Indian Institute of Technology Guwahati

Lecture-17 Prepared under QIP-CD Cell Project Jet Propulsion Ujjwal K Saha, Ph. D. Department of Mechanical Engineering Indian Institute of Technology Guwahati 1 Lift: is used to support the weight of

### smarts Downwind Strategy & Tactics Running makes up roughly half of most races we sail PLAYBOOK SERIES #3

David Dellenbaugh s SPEED & The newsletter of how-to tips for racing sailors May/June 2014 smarts PLAY 1: Begin each run with a plan If you want to perform well downwind, both strategically and tactically,

### Chapter 13 Fluids. Copyright 2009 Pearson Education, Inc.

Chapter 13 Fluids Phases of Matter Density and Specific Gravity Pressure in Fluids Atmospheric Pressure and Gauge Pressure Pascal s Principle Units of Chapter 13 Measurement of Pressure; Gauges and the

### Chapter 15 Fluids. Copyright 2010 Pearson Education, Inc.

Chapter 15 Fluids Density Units of Chapter 15 Pressure Static Equilibrium in Fluids: Pressure and Depth Archimedes Principle and Buoyancy Applications of Archimedes Principle Fluid Flow and Continuity

### Principles of glider flight

Principles of glider flight [ Lecture 1: Lift, drag & glide performance ] Richard Lancaster Email: Richard@RJPLancaster.net Twitter: @RJPLancaster ASK-21 illustrations Copyright 1983 Alexander Schleicher

### Agood tennis player knows instinctively how hard to hit a ball and at what angle to get the ball over the. Ball Trajectories

42 Ball Trajectories Factors Influencing the Flight of the Ball Nathalie Tauziat, France By Rod Cross Introduction Agood tennis player knows instinctively how hard to hit a ball and at what angle to get

### OFFSHORE RACING CONGRESS

World Leader in Rating Technology OFFSHORE RACING CONGRESS ORC Speed Guide Explanation 1. INTRODUCTION The ORC Speed Guide is a custom-calculated manual for improving performance for an individual boat.

### Small Sailboat Pocket Manual With Water Riddles And Memory Tips

Small Sailboat Pocket Manual With Water Riddles And Memory Tips By Floyd Jay Winters http://smallsailboats.net ii Copyright Notice Copyright 2016, 2017 by Floyd Jay Winters Small Sailboats Made Fun and

### 1. All fluids are: A. gases B. liquids C. gases or liquids D. non-metallic E. transparent ans: C

Chapter 14: FLUIDS 1 All fluids are: A gases B liquids C gases or liquids D non-metallic E transparent 2 Gases may be distinguished from other forms of matter by their: A lack of color B small atomic weights

### SPH 4C Unit 4 Hydraulics and Pneumatic Systems

SPH 4C Unit 4 Hydraulics and Pneumatic Systems Properties of Fluids and Pressure Learning Goal: I can explain the properties of fluids and identify associated units. Definitions: Fluid: A substance that

TUNE YOUR SAILS FOR OUTRIGHT SPEED J/70 Tuning Guide Rev. R02 After countless hours sailing, testing and competing in the J/70 One Design, North Sails has updated our tuning notes and tips in an effort

### Chapter 15 Fluid. Density

Density Chapter 15 Fluid Pressure Static Equilibrium in Fluids: Pressure and Depth Archimedes Principle and Buoyancy Applications of Archimedes Principle By Dr. Weining man 1 Units of Chapter 15 Fluid

### Lecture Outline Chapter 15. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.

Lecture Outline Chapter 15 Physics, 4 th Edition James S. Walker Chapter 15 Fluids Density Units of Chapter 15 Pressure Static Equilibrium in Fluids: Pressure and Depth Archimedes Principle and Buoyancy

### HOW TO BECOME A FAST GUY II (Upwind Racing Tactics) By Bob Szczepanski

HOW TO BECOME A FAST GUY II (Upwind Racing Tactics) By Bob Szczepanski Racing Tactics We learned in Fast Guy (issue #166) that performance sail trim can be achieved by managing power in the main and jib.

### Section III Principles of design and aerodynamics

Section III Principles of design and aerodynamics 1 Principles of the Tasar rig a) Evolution The most significant advance in recent decades in the art of handling sailboats has been the use of tufts and

### THEORY OF WINGS AND WIND TUNNEL TESTING OF A NACA 2415 AIRFOIL. By Mehrdad Ghods

THEORY OF WINGS AND WIND TUNNEL TESTING OF A NACA 2415 AIRFOIL By Mehrdad Ghods Technical Communication for Engineers The University of British Columbia July 23, 2001 ABSTRACT Theory of Wings and Wind

### PHYS 101 Previous Exam Problems

PHYS 101 Previous Exam Problems CHAPTER 14 Fluids Fluids at rest pressure vs. depth Pascal s principle Archimedes s principle Buoynat forces Fluids in motion: Continuity & Bernoulli equations 1. How deep

### J/24 Tuning Guide. Before The Boat Hits The Water

J/24 Tuning Guide Haarstick Sailmakers have used our years of experience building and racing J/24 s to develop a FAST set of sails, geared for performance in a variety of conditions. Together with the

### Chapter 3 PRESSURE AND FLUID STATICS

Fluid Mechanics: Fundamentals and Applications, 2nd Edition Yunus A. Cengel, John M. Cimbala McGraw-Hill, 2010 Chapter 3 PRESSURE AND FLUID STATICS Lecture slides by Hasan Hacışevki Copyright The McGraw-Hill

### E Using a spinnaker

1 595-560-E 2007-01-05 Using a spinnaker 2 Spinnaker sailing These instructions have been compiled with both the beginner and the experienced sailor in mind. Our aim has been to help the beginner to start

### TUNE YOUR SAILS FOR OUTRIGHT SPEED. Melges 20 Tuning Guide. Rev R05

TUNE YOUR SAILS FOR OUTRIGHT SPEED The following tuning guide is meant to be a good starting point when setting up your Melges 20. Depending on total crew weight, wind and sea condition and sailing style

### LEARN TO SAIL HANDBOOK

ENGLEWOOD SAILING ASSOCIATION, INC. ESTABLISHED 2002 LEARN TO SAIL HANDBOOK An Introduction to Small Boat Sailing www.englewoodsailing.org info@englewoodsailing.org 941-681-8190 W elcome to the sailing

### SUBPART C - STRUCTURE

SUBPART C - STRUCTURE GENERAL CS 23.301 Loads (a) Strength requirements are specified in terms of limit loads (the maximum loads to be expected in service) and ultimate loads (limit loads multiplied by

### Introduction to Dinghy Sailing AYF - TL1 Course Notes

North Harbour Sailing Club Established 1948 Introduction to Dinghy Sailing AYF - TL1 Course Notes CONTENTS Introduction. Safety. Parts of the Boat. Rigging. Boat Handling. Leaving and Returning to Shore.

### How to Sail Fast : Rig Tuning - by Bob Sterne

How to Sail Fast : Rig Tuning - by Bob Sterne Bob Sterne is the Executive Secretary of the CRYA, and one of the top Radio Controlled Sailboat designers. He builds World Class boats and his sails are the

### Chapter 13 Fluids. Copyright 2009 Pearson Education, Inc.

Chapter 13 Fluids Phases of Matter Density and Specific Gravity Pressure in Fluids Atmospheric Pressure and Gauge Pressure Pascal s Principle Units of Chapter 13 Measurement of Pressure; Gauges and the

### ODOM CLASS SPECIFICATIONS

ODOM CLASS SPECIFICATIONS Effective March 1, 2004 1. GENERAL 1.1 Purpose of the Measurement Rules 1.1.1 The ODOM is a One-Design Class as defined by the American Model Yachting Association (AMYA). However,

### The Discussion of this exercise covers the following points:

Exercise 3-2 Orifice Plates EXERCISE OBJECTIVE In this exercise, you will study how differential pressure flowmeters operate. You will describe the relationship between the flow rate and the pressure drop

### STABILITY OF MULTIHULLS Author: Jean Sans

STABILITY OF MULTIHULLS Author: Jean Sans (Translation of a paper dated 10/05/2006 by Simon Forbes) Introduction: The capsize of Multihulls requires a more exhaustive analysis than monohulls, even those

Buoyancy Additional Information Any object, fully or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object. Archimedes of Syracuse Archimedes principle

### 1. The principle of fluid pressure that is used in hydraulic brakes or lifts is that:

University Physics (Prof. David Flory) Chapt_15 Thursday, November 15, 2007 Page 1 Name: Date: 1. The principle of fluid pressure that is used in hydraulic brakes or lifts is that: A) pressure is the same

### CONTROL SETUP WASZP Team 11/29/2016

CONTROL SETUP WASZP Team 11/29/2016 INTRO This guide will help you tune your WASZP for optimised stability and performance. It will run through a good base setting for the systems that control your flight,

### Basic Keelboat Sailing Standard (ASA 101)

Basic Keelboat Sailing Standard (ASA 101) Prerequisites: None General Description: Description: Demonstrated ability to skipper a sloop-rigged keelboat of approximately 20 to 27 feet in length by day in

### RACING BASICS - Beginner's Racing Manual RACING BASICS. by Mark Johnson [copyright 1/19/95]

3/4/2001 9:28 PM RACING BASICS by Mark Johnson [copyright 1/19/95] there is a print version available... Table of Contents Introduction Attitude Chapter 1 - Priorities for Practice Chapter 2 - Rigging

### J/70 Tuning Guide. onedesign.com Follow North Sails on... For any question you may have on tuning your J/70 for speed, contact our experts:

Photo Paul Todd/OUTSIDE IMAGES For any question you may have on tuning your J/70 for speed, contact our experts: Ruairidh Scott 01329 443 430 ruairidh.scott@northsails.com Tim Healy 401-683-7997 tim.healy@northsails.com

### Manual For Race Directors Space Coast Model Sailing Club

Manual For Race Directors Space Coast Model Sailing Club March 3rd, 2006, Revision 1 SCMSC RACE DIRECTOR MANUAL 1.0 INTRODUCTION 1.1 Race Director Assignments The Space Coast Model Sailing Club has a policy

### MATCH RACING RULES APPENDIX C

APPENDIX C Match races shall be sailed under The Racing Rules of Sailing as changed by this appendix. Matches shall be umpired unless the notice of race and sailing instructions state otherwise. C1 TERMINOLOGY

Parasite Drag by David F. Rogers http://www.nar-associates.com Copyright c 2005 David F. Rogers. All rights reserved. How many of you still have a Grimes rotating beacon on both the top and bottom of the

### Experiment 8: Minor Losses

Experiment 8: Minor Losses Purpose: To determine the loss factors for flow through a range of pipe fittings including bends, a contraction, an enlargement and a gate-valve. Introduction: Energy losses

### INTRODUCTION & DESCRIPTION CHANGES WARRANTY SERVICE FEATURES & SPECIFICATIONS SAFETY PRECAUTIONS ITEMS REQUIRED

WARNING: NEVER attempt to swim after a stalled R/C boat!. Never operate your R/C boat while standing in the water. Never operate your R/C boat in the presence of swimmers. Always use a Personal Flotation

### Pressure Measurement

Pressure Measurement Manometers Sensors, Transducers Ashish J. Modi Lecturer, Dept. of Mech.Engg., Shri S.V.M. inst. Of Technology, Bharuch Pressure Pressure is a force per unit area exerted by a fluid

### Pelagic Sailing Club Membership Application

Pelagic Sailing Club Membership Application For club use only Ck# Amt \$ Date Crew Boat Owner Skipper Last Name First Name Spouse s name: Mailing Address City State Zip Phones: Home Work: Ext Cell: E-Mail

### Aerodynamically Efficient Wind Turbine Blade S Arunvinthan 1, Niladri Shekhar Das 2, E Giriprasad 3 (Avionics, AISST- Amity University, India)

International Journal of Engineering Science Invention ISSN (Online): 2319 6734, ISSN (Print): 2319 6726 Volume 3 Issue 4ǁ April 2014ǁ PP.49-54 Aerodynamically Efficient Wind Turbine Blade S Arunvinthan

### Cathy Foster Coaching Session for the Datchet Flying Fifteen Fleet

Cathy Foster Coaching Session for the Datchet Flying Fifteen Fleet Cathy Foster ex Olympian and professional coach, came to Datchet Sailing Club today 11th August 2012. Six club boats rigged and ready

### Old-Exam.Questions-Ch-14 T072 T071

Old-Exam.Questions-Ch-14 T072 Q23. Water is pumped out of a swimming pool at a speed of 5.0 m/s through a uniform hose of radius 1.0 cm. Find the mass of water pumped out of the pool in one minute. (Density

### The USA Canterbury J. Class Rules

Canterbury J Class Owners Association The USA Canterbury J Class Rules 2010 As Accepted 2008 and Revised February 2010 Published March 2010 The Canterbury J Class Rules ~ 2008 Page 1 of 10 THE CANTERBURY

### PILOT S HANDBOOK of Aeronautical Knowledge AC61-23C

PILOT S HANDBOOK of Aeronautical Knowledge AC61-23C Revised 1997 Chapter 1 Excerpt Compliments of... www.alphatrainer.com Toll Free: (877) 542-1112 U.S. DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION

### EYC Super Hard Rules Quiz

EYC Super Hard Rules Quiz (Use your rule book and the online ISAF Case Book) 1. Whenever there is contact between 2 boats racing, one boat must take a two-turns penalty, retire, or face disqualification.

### AMYA SeaWind Class Rules

AMYA SeaWind Class Rules Revised 4/1/2011 1 GENERAL - CLASS: The SeaWind is a one design class. The class objective is competition where the skill of the skipper in sailing and adjusting his boat will

### PRODUCT KNOWLEDGE INFORMATION SHEETS PERFORMANCE FEATURES

S PERFORMANCE FEATURES Caliber Yachts, Inc. reserves the right to modify or change these features, drawings, diagrams, written copy, etc., without notice. Caliber Yachts, Inc. will in no way whatsoever