In rec.aviation.piloting Charles Vincent wrote:
wrote:
The biggest source of drag on a car is air followed by tires.
Of course the makers are going to put hard tires on as well as
streamline the vehicle to get mileage up.
The less drag, the less gas the vehicle uses.
What's your point?
That is only true in cruise on the highway. In stop and go city driving
driveline friction is the majority, followed by inertia. Air and tire
is a small percentage combined.
Inertia is not drag.
Inertia is F=ma.
In stop and go driving, F=ma dominates.
If it didn't, hybrids converting the F in deceleration into energy in
the batteries instead of heat in the brakes wouldn't get their high
mileage numbers.
--
Jim Pennino
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