WATTS DOWN ON ROAD

[JOHN WALKER]

FTHP TEST ON ROAD AS PER PAGE 47 OF TRAINING WITH POWER METER 2nd EDITION - ALLEN & COGGAN.
COMPLETED COAST DOWN, CAL RIDE, TILT AND CAL WIND. TO THE LETTER OF THE LAW.
Attached FTHP result. What have I done wrong. to have such low watts.
Am not experienced enough to twig the figures.
Help, please, surely I cannot be a tortise.

John

[Velocomp]

Please attach ride file, not the pdf image of it

[racerfern]

Your Crr isn't .0181 AND your CdA isn't .020 when you weigh 88kg. So post the ride file and we'll get it figured out rather quickly. Nice effort BTW.

[JOHN WALKER]

Attach file ride, trust this is correct. my actual body weight is 74/75 kg and the combined bike and self is 88kg.
thank you very much for helping me out. I sense there is hope for me.
regards

John

[JOHN WALKER]

Have you had any luck with correcting ?

john

[racerfern]

Sorry for the delayed reply. I kept on looking at a file from April you posted and thought it was figured out.

Anyways, somehow you have an extremely low wind scaling that is throwing everything off. Right now the easiest way is for you to install the profile attached to this posting. Apply it to your ride and see if it fits into your perception of what the effort was.

You should consider doing another cal ride to confirm your wind scaling.

[JOHN WALKER]

Completed another Cal & Coast Down on smooth asphalt: Cal wind and tilt performed immediately before ride.
Results:
Aero .292 Wind Scaling: .758 CdA: .385
Friction: 8.201 Riding Tilt: -0.7 Crr: .0025

I ride: Bianchi with Vittoria Zaffiro Slicks. Ride mostly on the hoods.

Bike and self weight: 88kg / 194lbs

The suggestions in Ibike manual suggest Crr: .0055 and CdA: .34 to .43

Do these figures appear reasonable?

John

[racerfern]

I'm glad to see your wind scaling came up. You're pretty much there except I see too much CdA and not enough Crr. No worries, apply this profile and you should be good to go.

It has CdA of .355 and Crr of .0055

Let me know how it works for you.