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Re: It's not 21% loss, it's factor of 1.21 (more) (archive)

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Posted by Paul E on May 01, 2000 at 13:04:09:

In Reply to: It's not 21% loss, it's factor of 1.21 (more) posted by PM3 on April 30, 2000 at 18:02:35:

: This is where I used to get it mixed up too. When you multiply by factor of 1.21, it's the same as adding 17.5% back to flywheel. THEN take off the 17.5% at the fly, and you'll get your rear wheel HP..but you can't get the same # by multiplying by 1.175, and expecting to get the same Flywheel HP again.
: See, RW HP has to be same as (0.825) which is 1-17.5%, mulitiplied by the flywheel HP. That will give you the 17.5% LOSS to the WHEELS, to get the RW HP. Otherwise, just multiply by the RW HP by 1.21 (or divide by 0.825), and you'll get almost the same #'s to the Flywheel. CYA>PM3

: : That is due to the drivetrain, correct? How does the drivetrain dissipate that power? Friction? Is there anything that could be done to reduce that loss? Just curious.

: : Thanks,
: : Ken

Right...The reciprocal would be to just divide the RWHP by 82.5% instead of multiplying by a factor of 1.21. The results are the same, but you can see the relationship because 82.5 is the reciprical of 17.5, which is the drivetrain loss.....Its relationship to 1.21 is a little more involved, as you indicate...

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