The Mall caibration Course Taping

Transcription

1 The Mall caibration Course Taping Raw tape results for The Mall Calibration Course David 6 *50m lengths plus m Hugh 6 *50m lengths plus m Average m m m Assume David and Hugh pulled the tape at exactly 50N which is the standard tension figure for class 2 tapes Convert 50N to Kg= 50/9.81= 5.10 Kg or = lbs Tape Calibration Results from NIST Tape length Tension Kg 20 40m-100m NIST report p NIST report p2 Calculated from 10kg & 20Kg NIST values calculated So for 60m measured on tape scale adjustment needed for 50N would be = mm Raw measurement of The Mall was m so adjustment needed will be mm So raw corrected for tension = = m Temperature Correction for 11C (as per Correct to 20C NIST calibration temp Correction = *(- 9) * = mm Page 1

2 The Mall caibration Course Taping THE MALL CALIBRATION COURSE CORRECTED FOR TAPE TENSION AND TEMPERTAURE = Mike's Laser Measurement of The Mall Calibration Course laser readings Deduct extra from slope of laser beam plumb-laser ref reflection- front face bob to cal end mark After corrections Corrected laser Total So Laser gave a measurement which was larger = m As a percentage this is 0.011% The specification for the Bosch Professional GLM 250VF is as follows In unfavourable conditions (e.g. at intense sunlight or an insufficiently reflecting surface), the maximum deviation is ±20 mm per 150 m. In favourable conditions, a deviation influence of ±0.05 mm/m must be taken into account. This spec is 0.013% in unfavourable conditions and 0.005% in favourable conditions, so the laser measurement is consistent with its specified accuracy Page 2

3 Mike's Calibrations Specialized All Cond Armadillo 700x25 tyre pumped ~ 110psi on 9 June at Mikes cals Long Tow, Abingdon, Cal length m Date Time start R1 end R1 end R2 end R3 end R4 CONSTANT Ride 1 count Ride 2 count Ride 3 count Ride 4 count av temp C 10 Jun :00: dry 11 Jun :30: very wet rain 12 Jun :45: wet -no rain 13 Jun :56: dry 14 Jun :12: dry N.B The Mall is very smooth but with holes, Long Tow was resurfaced with tar and small stones last summer, and is much rougher. For a pneumatic tyre The Mall should give a larger constant. The Mall Cal Length m Date Time start R1 end R1 end R2 end R3 end R4 CONSTANT Ride 1 count Ride 2 count Ride 3 count Ride 4 count av temp C 13 Jun :07: dry 13 Jun :37: dry average used Page 3

4 Mike-13jun2012 MIKE'S RIDE RESULTS Constant cts/km Mike's description of Hugh's Hugh's measurement schedule Hugh's No. location Count count Inc Dist inc km Cum dist km Start/Finish 1 LP Traffic light Westminster br 2?????unclear note Joint on N side Joint on S side Ped light at start Mall 4 dashed line Start/Finish 5 Mid point between Tarmac join lines Start/Finish 5 Mid point between Tarmac join lines Between Telephone Boxes 6 Between Telephone Boxes Cleopatra's needle 7 R Temp=11.8C Last LP before Waterloo Bridge 8 LP on L WL Hill start divider 9 Start Divider on R Paternoster Sq Tree apron 10 Paternoster Sq:N edge Column on L st LP Cheaopside 10a Lp on L bread St E Kerb 11 level with kerb of road on R Tl Leadenhall str 12 Post on R finger Post Eastcheap 13 finger pole on L Start is. Before Byward St 14 First edge divide in centre Tower Hill turn 15 Turn at divider near Tower London Br LP2 16 LP centre on L Ped light at Millennium Br 17 TF LP on L TL opp Temple Ave 18 Pole on L LP90 (Before HG Ave) 19 Centre LP on L Far side BoB memorial 20 S face Block on L Time=04:23 LP 6 George St 21 LP on R LPG92 Birdcage Walk 22 C88 on R Ped light The Mall 23 dashed line Start/Finish 24 Start/finish Page 4

5 Hughs cals HUGH'S CALIBRATIONS The Mall Cal Length m Date Time start R1 end R1 end R2 end R3 end R4 CONSTANT Ride 1 count Ride 2 count Ride 3 count Ride 4 count 13 Jun :30: Jun :40: average used Page 5

6 hugh-13jun2012 HUGH'S RAW COUNTS Constant cts/km Hugh's measurement schedule Hugh's No. Count count Inc Dist inc km Cum dist km Start/Finish Traffic light Westminster br Ped light at start Mall Start/Finish Start/Finish Between Telephone Boxes Cleopatra's needle Last LP before Waterloo Bridge WL Hill start divider Paternoster Sq Tree apron st LP Cheaopside 10a bread St E Kerb Tl Leadenhall str finger Post Eastcheap Start is. Before Byward St Tower Hill turn London Br LP Ped light at Millennium Br TL opp Temple Ave LP90 (Before HG Ave) Far side BoB memorial LP 6 George St LPG92 Birdcage Walk Ped light The Mall Start/Finish Page 6

7 Davids cals DAVID'S CALIBRATIONS The Mall Cal Length m Date Time start R1 end R1 end R2 end R3 end R4 CONSTANT Ride 1 count Ride 2 count Ride 3 count Ride 4 count 13 Jun :06: Jun :36: average used Page 7

8 david-13jun2012 Corrected DAVID'S RAW COUNTS Constant cts/km Hugh's measurement schedule Hugh's No. Count count Inc Dist inc km Cum dist km Start/Finish Traffic light Westminster br Ped light at start Mall Start/Finish Start/Finish Between Telephone Boxes Cleopatra's needle Last LP before Waterloo Bridge WL Hill start divider Paternoster Sq Tree apron st LP Cheaopside 10a bread St E Kerb Tl Leadenhall str finger Post Eastcheap Start is. Before Byward St Tower Hill turn London Br LP Ped light at Millennium Br TL opp Temple Ave LP90 (Before HG Ave) Far side BoB memorial LP 6 George St LPG92 Birdcage Walk Ped light The Mall Start/Finish Page 8

9 differences DIFFERENCES BETWEEN 3 RIDERS MCWS Hugh's measurement location schedule Hugh's No. note Start/Finish 1 LP Mike accumulated dist km Hugh-mike accumulated dist m Hugh -Mike interval m David-mike Hugh-Mike accumulated interval %age dist m David -Mike interval m David-Mike interval %age Hugh-david accumulated dist m Hugh David Hugh David interval m interval %age inc inc Traffic light Westminster br 2?????unclear note % % % 3 Joint on N side % % % 3 Joint on S side Ped light at start Mall 4 dashed line % % % Start/Finish 5 Mid point between Tarmac join lines % % % Start/Finish 5 Mid point between Tarmac join lines Between Telephone Boxes 6 Between Telephone Boxes % % % Cleopatra's needle 7 R % % % Last LP before Waterloo Bridge 8 LP on L % % % WL Hill start divider 9 Start Divider on R % % % Paternoster Sq Tree apron 10 Paternoster Sq:N edge Column on L % % % 1 st LP Cheaopside 10a Lp on L % % % bread St E Kerb 11 level with kerb of road on R % % % Tl Leadenhall str 12 Post on R % % % finger Post Eastcheap 13 finger pole on L % % % Start is. Before Byward St 14 First edge divide in centre % % % Tower Hill turn 15 Turn at divider near Tower % % % London Br LP2 16 LP centre on L % % % Ped light at Millennium Br 17 TF LP on L % % % TL opp Temple Ave 18 Pole on L % % % LP90 (Before HG Ave) 19 Centre LP on L % % % Far side BoB memorial 20 S face Block on L % % % LP 6 George St 21 LP on R % % % LPG92 Birdcage Walk 22 C88 on R % % % Ped light The Mall 23 dashed line % % % Start/Finish 24 Start/finish % % % Page 9

10 differences 12.8 km loop Hugh-David (in turquoise), Hugh-Mike (in dark blue), David-Mike (in green) David- Mike & Hugh-Mike & Hugh-David cumulative metres Distance km Page 10

11 differences 12.8 km loop Hugh-David (in turquoise) Hugh-Mike (in dark blue) & David-Mike (in green) as a %age of each interval 0.200% Size of +/- 1 SCPF is shown shaded David-Mike & Hugh-Mike & Hugh-David as %age 0.150% 0.100% 0.050% 0.000% % % % % % % Page 11

12 MIKE'S temp-defl-cal correction Mikes series of calibrations corrected by average temp coeff and daily deflation to the the measurement mid point ie 13 June 03:22 temp 10.55C Adjust to 10.55C Adjust for deflation Temp coeff cts/c = Deflation cts/day= cal course Date Time cts/km av temp C Day/time Long Tow 10 Jun :00: dry :07:00:00 Long Tow 11 Jun :30: very wet rain :05:30:00 Long Tow 12 Jun :45: wet -no rain :04:45:00 The Mall 13 Jun :07: dry :02:07:00 The Mall (average) 13 Jun :22: dry :03:22:00 The Mall 13 Jun :37: dry :04:37:00 Long Tow 13 Jun :56: dry :19:56:00 Long Tow 14 Jun :12: dry :05:12:00 Long Tow 23 Jun :50: dry :11:50:00 Taking as a representative cal from Long Tow corrected to 10.55C and for deflation to bring it to constant expected at 03:22 13 june, and comparing with the averaged on the Mall, we see that the smooth Mall surface gives about 4 cts/km more. This is consistent with what might be in general expected for a Constant increase on the Mall % pneumatic tyre, since Long Tow is rough However I have recently discovered some rather different behaviour from my pneumatic tyre NOTE: The temperature coefficient and rate of deflation for this tyre were determined from calibration results taken between 15 May & 6 June 2011 Page 12

13 summary of riders measurements Olympic lap measurements (without the turnaround adjustments) using m for cal course and Calculation of turnaround adjustments Lap measurements before turnrounds adjusted Calculation of turnround adjustments course (1 short lap + 3 short lap long lap long laps) 8 miles semicircle lap 8 miles 2 miles 385y lap David Hugh Mike fractional range 0.019% 0.026% 0.026% Km reqd. for Length of 4.3m centre move to make long (lengthen) km reqd. for centre move to make correct short (ie shorten) Mike Sandford's Recommendation: Since Hugh was most familiar with the course having ridden it about 20 times take Hugh's values for the adjustment. Hugh's values are also the median values of the 3 measurements. Page 13