AERO REPORT
Date: 2025-11-17 | Rider: Mattie Dodd (DODD, Mattie) | Location: Merton, Bicester
Description: TT Bike
Course
Distance between gates: 1165 m
Elevation difference (A to B): -0.2 m
Weather
Results
Six configurations were tested
Baseline Config
Config
Description
CdA (Normalised)
CdA Delta
Power in Watts at 50 kph
Power Delta
A
Baseline TT Bike = 80mm stack, 4th from rwd reach
0.232
-
429
-
Delta to Config A
Config
Description
CdA (Normalised)
CdA Delta
Power in Watts at 50 kph
Power Delta
B
Config B = 45mm stack
0.228
-0.004
423
-6
C
Config C = 70mm stack
0.228
-0.004
423
-7
D
Config D = 80mm stack, 1 from fwd reach
0.230
-0.002
426
-3
E
Config E = 80mm stack, max rwd reach
0.232
-0.000
429
-0
F
Config F = 70mm stack, max rwd reach
0.228
-0.004
423
-6
Performance
Data Quality
CdA Standard Deviation of Laps (Traverse Pairs): 0.0016, CV: 0.70%
Show Confidence Interval:
95% Confidence Interval of Mean: 0.231 -
0.233 (±0.0014)
Dashed lines on plot show confidence. Further consistent repeats will narrow this interval
Detailed Run Data - CdA & Power
| Run Number | Start Time | Description | CdA 5°XW Normalised Full m² | CdA Raw m² | Alpha W | Aero W | Grav W | Kinetic W | Rolling W | Power W |
|---|---|---|---|---|---|---|---|---|---|---|
| A | - | Baseline TT Bike = 80mm stack, 4th from rwd reach | 0.232 | 0.228 | 1103 | 251 | 0 | -6 | -54 | 311 |
| 1 | 11:35 | - | 0.230 | 0.225 | 1133 | 255 | 0 | -0 | -55 | 310 |
| 2 | 11:53 | - | 0.232 | 0.225 | 1110 | 250 | -0 | -6 | -54 | 310 |
| 5 | 12:50 | - | 0.231 | 0.224 | 1121 | 251 | 0 | -8 | -54 | 313 |
| 9 | 15:04 | - | 0.234 | 0.237 | 1049 | 248 | 0 | -10 | -53 | 311 |
| B | - | Config B = 45mm stack | 0.228 | 0.221 | 1105 | 244 | -0 | -10 | -54 | 308 |
| 3 | 12:15 | - | 0.228 | 0.221 | 1105 | 244 | -0 | -10 | -54 | 308 |
| C | - | Config C = 70mm stack | 0.228 | 0.222 | 1116 | 248 | -0 | -9 | -54 | 311 |
| 4 | 12:34 | - | 0.228 | 0.222 | 1116 | 248 | -0 | -9 | -54 | 311 |
| D | - | Config D = 80mm stack, 1 from fwd reach | 0.230 | 0.229 | 1033 | 236 | -0 | -11 | -52 | 299 |
| 6 | 13:47 | - | 0.230 | 0.229 | 1033 | 236 | -0 | -11 | -52 | 299 |
| E | - | Config E = 80mm stack, max rwd reach | 0.232 | 0.230 | 1118 | 257 | 0 | -8 | -54 | 318 |
| 7 | 14:16 | - | 0.232 | 0.230 | 1118 | 257 | 0 | -8 | -54 | 318 |
| F | - | Config F = 70mm stack, max rwd reach | 0.228 | 0.228 | 1086 | 248 | 0 | -5 | -53 | 306 |
| 8 | 14:40 | - | 0.228 | 0.228 | 1086 | 248 | 0 | -5 | -53 | 306 |
Detailed Run Data - Speed, Position & Calibration
| Run Number | Distance m | Duration s | Speed m/s | Air Speed m/s | Yaw (abs) deg. | Yaw deg. | Head cm | Chest cm | CpCorr | Wheel Circumference m | Yaw Offset ° | Combined Mass | Power Meter Slope | Crr | Crr at Test Temp |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 1154.2 | 95.8 | 12.05 | 12.16 | 6.4 | -0.0 | 22.6 | 7.2 | 1.075 | 2.10 | -0.64 | 89.20 | 0.970 | 0.00400 | 0.00513 |
| 1 | 1154.6 | 94.9 | 12.18 | 12.26 | 6.5 | -0.2 | 22.8 | 7.5 | - | - | - | - | - | - | 0.00517 |
| 2 | 1154.8 | 95.6 | 12.09 | 12.21 | 7.3 | -0.4 | 22.7 | 6.9 | - | - | - | - | - | - | 0.00514 |
| 5 | 1154.2 | 95.3 | 12.11 | 12.26 | 7.2 | -0.0 | 22.5 | 6.5 | - | - | - | - | - | - | 0.00509 |
| 9 | 1153.3 | 97.5 | 11.83 | 11.91 | 4.5 | 0.4 | 22.4 | 7.8 | - | - | - | - | - | - | 0.00510 |
| B | 1154.4 | 95.6 | 12.08 | 12.16 | 7.4 | 0.3 | 23.0 | 7.3 | 1.075 | 2.10 | -0.64 | 89.20 | 0.970 | 0.00400 | 0.00512 |
| 3 | 1154.4 | 95.6 | 12.08 | 12.16 | 7.4 | 0.3 | 23.0 | 7.3 | - | - | - | - | - | - | 0.00512 |
| C | 1153.4 | 95.7 | 12.05 | 12.24 | 6.9 | -0.3 | 22.9 | 7.0 | 1.080 | 2.10 | -0.64 | 89.20 | 0.970 | 0.00400 | 0.00510 |
| 4 | 1153.4 | 95.7 | 12.05 | 12.24 | 6.9 | -0.3 | 22.9 | 7.0 | - | - | - | - | - | - | 0.00510 |
| D | 1153.5 | 98.8 | 11.68 | 11.95 | 5.9 | -0.1 | 23.0 | 8.5 | 1.110 | 2.10 | -0.64 | 89.20 | 0.970 | 0.00400 | 0.00506 |
| 6 | 1153.5 | 98.8 | 11.68 | 11.95 | 5.9 | -0.1 | 23.0 | 8.5 | - | - | - | - | - | - | 0.00506 |
| E | 1154.6 | 95.6 | 12.09 | 12.18 | 5.7 | -0.5 | 21.2 | 7.6 | 1.075 | 2.10 | -0.64 | 89.20 | 0.970 | 0.00400 | 0.00507 |
| 7 | 1154.6 | 95.6 | 12.09 | 12.18 | 5.7 | -0.5 | 21.2 | 7.6 | - | - | - | - | - | - | 0.00507 |
| F | 1154.7 | 96.4 | 11.98 | 12.06 | 5.3 | -0.5 | 5.7 | 7.3 | 1.075 | 2.10 | -0.64 | 89.20 | 0.970 | 0.00400 | 0.00508 |
| 8 | 1154.7 | 96.4 | 11.98 | 12.06 | 5.3 | -0.5 | 5.7 | 7.3 | - | - | - | - | - | - | 0.00508 |