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Don't forget that 247hp is at 9000rpm, there is probably little difference at 7500rpm. 7500rpm is probably max. wit5h a 2.85:1 re-drive.
Georges B.
Christavia Mk IV. 13b NA
-------Original Message-------
Date: 05/31/05 16:26:25
Subject: [FlyRotary] 213 mph 75% cruise (was: RX-8 6 port Intake - Like, complicated....)
At 03:56 PM 5/31/2005, you wrote:
>
>I must say I agree with Tracy on this, after looking at both, the only
>difference been power seems ( to me) to be as a result of the complex
>porting. As this will be scrapped for a 'home-brew' port arrangement, I
>believe the 4 port will be a lot easier to work on - for the average builder!
The two extra ports get you 40 extra HP with no additional weight.
This is a 20% increase in HP for the trouble of building two more
runners on the intake.
The top speed for an RV-7 with 247 HP could be 240 MPH, perhaps
even more with a skinny cowling. (I realize this is beyond the 230 mph Vne,
but I was just making a point.....)
Regardless, it's fun just to think about a 75% cruise speed of 213
mph.
Bill Dube'
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