Red Doggie,
Don't really need a steam engine afterall.
Assuming zero acceleration at steady state speed (and no mistakes in the SI
vs English conversions)
Using classic equation for drag force in Newtons using your Cd, frontal
area, density of the medium, and speed in m/s.
N=1/2*Cd*A*rho*v^2
I came up with 675.4 Newtons SI which converts to 151 ft-lbs. English
Then, a motor which produces 72 HP at 2500 RPM will have the required 151
ft-lbs.
10.1" radius tires, 1:1 gearing at 2500 rpm
speed(MPH)=RPM*tire radius/(168*gearing)
You do have a very valid point that HP cannot be ignored.
It is totally tied to HP and RPM.
However, since RPM was free, I used it to my advantage.
Chuck
From: [EMAIL PROTECTED]
Reply-To: [email protected]
To: [email protected]
Subject: RE: [F500] F100000000
Date: Tue, 1 Aug 2006 08:19:05 -0600
Hmmm, that's interesting. OK, here's a questions:
How much torque, at what RPM, with what overall gearing and tire rolling
radius would one need to make a car with a CD of 0.6, and a frontal area of
0.5 m^2 go 150 MPH in air with a density of 1.2 kg/m^3? And since power
doesn't matter, can it be done with less than 72 hp (without a tailwind or
going downhill)?
;)
On Mon, 31 Jul 2006 20:44:07 -0700, Chuck Voboril wrote
> Physics don't lie, doggy. :->
> HP only determines acceleration.
>
> Fundamental differnence betweeen power and energy.
> Chuck
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