UK Karting - Notice Board (4-Stroke Karting) : Re: ram effect/forced air.... err..... trev!

Notice Board (4-Stroke Karting)

Re: ram effect/forced air.... err..... trev!
Posted by 'SimonS' on 14 Oct 2008 @ 10:01

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SimonSJoined: December 2004
Total Posts: 4
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Before using ram air, you have to make sure you have usable RAM.

The formula is 1/2rhoVsquared where
Rho=air density=1.225 kg/m3. a cubic metre of air weighs 1.225 kg
V=velocity in metres per second.

If we assume an average speed of 50mph (22.352 m/s)

then 0.5 *1.225*22.3 *22.3 =304.5 Nm sq=3.045 hPa

there are 1000 hPa in an atmosphere(or 1 bar).

So your ram air effect at 50mph is 3/1000 of a bar. That's assuming your inlets are sited somewhere useful and not in a low pressure area or where the flow of air is disturbed, deflected etc.

The other problem to consider is that your engine is quite sensitive to fuel mixture. Since the formula varies as the square of the speed you would constantly be adjusting mixture to compensate for speed. (eg, full throttle coming out of a bend would be entirely different from full throttle down the straight.)

Message Thread:

ram effect/forced air by 'tonyracer' (12 Oct 2008 @ 22:50)

Re: ram effect/forced air by 'itpro' (13 Oct 2008 @ 13:55)

Re: ram effect/forced air by 'RoadRat' (13 Oct 2008 @ 16:51)

Re: ram effect/forced air by 'Trev' (13 Oct 2008 @ 23:33)

Re: ram effect/forced air.... err..... trev! by 'itpro' (14 Oct 2008 @ 0:40)

Re: ram effect/forced air.... err..... trev! by 'SimonS' << You are here!

Re: ram effect/forced air.... err..... trev! by 'Spannerman' (14 Oct 2008 @ 10:09)

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