[s-cars] Accurate Drive-Train Loss on UrS?

[Calvin & Diana Craig]

I forgot about the normal force thing...DUH!  That does apply to the
frictional losses but not the inertial losses.  Hmmm...I wonder how much of
which is in the total.  My guess would be that it is more rotational.  There
are a couple of reasons I say this.  We can use our own cars here as a test
case.

There is very little extra "frictional" loss increase due to driving through
two different gearboxes in an AWD car..that is split the power, so the
normal force goes down but there are more components so it remains about a
wash as far as total loss goes.  However, the inertia of the extra
components is definitely a factor.  So much so that the figure increases by
about 60% for AWD cars.  Therefore this means that the inertia is a very
significant contributor in the first place.

Also, I haven't heard anyone complaining of really high oil temps among our
400 HP club here, which when doubling the frictional losses you would think
would be a factor if they were really causing a 25% loss in HP.

--Calvin