With 250 to 300 HP a Mustang II should be way faster than an RV4.

With 250 to 300 hp an RV4 should be way faster than an RV4. : )
Brian Trubee

Let me reword this:)

With 250 to 300 HP a Mustang II should be way faster than an RV4 with 250

to 300 HP.

Paul Lamar

-Alan Tolle wrote:

Not really intending to argue the point, but I think in a run off between a
Mustang II and RV-4 with the same horsepower the RV-4 would still be a
little faster.  Early on I had the chance to fly m RV-4 with against a very
clean Mustang II.  We both had 180 hp Lycoming engines and constant speed
props governor limited at 2700 rpm.  We both showed 28 inches of manifold
pressure, so the power out was very close to the same.  The RV-4 was
faster, but only by 2 o3 knots.

To my knowledge the fastest Mustang II on record was created by Kent Passer
in the 1980's.  As the result of very extensive aerodynamic clean up and
power output efforts his top speeds were in the neighborhood of 240 mph.
In comparison, Dave Anders' RV-4 topped Passer's best numbers very handily
in the Triavethon competition sponsored by the CAFE Foundation.

All in all, the airframe clean up was far more significant than the
horsepower output, a point for all homebuilders to keep in mind.

AlanTolle

I'll bet Dave Anders had a lot more HP :) Was that an IO 360 or an O-360 
in Kent Passer's airplane? An IO-360 is more than just the addition
of fuel injection. The valves are larger and or freer breathing. I know you
know this Allan.

Paul Lamar
 
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