Wrathall Mark wrote:

There was a posting a couple of days ago by someone who is
planning a P-51 style duct on an RV-4.

If I followed it correctly the plan is to mount a 24x8', relatively
thick radiator below the fuselage,thus avoiding the need to
redesign the elevator push-rod linkage which has a bellcrank in
just the wrong place for the radiator if you go up into the Fuselage.

I have RV-4 plans and I am curious how you reconciled your
weight and balance with this radiator location.
My understanding is that Tracy's 13B installation with the stock
cowl and radiators up front came in with a firewall forward
weight comparable with the O-320. Is this not about the minimum
weight required up front to allow two seat operation?

I would be interested in your solution, as your observation of
moving the radiator out of the engine cowl simplifying things
strikes a chord.

Paul, are you planning to peripheral port your turbo installation?

NO. Since Abel Ibarra is getting 730 HP with just a street port
on his turbo 13B two rotor I think that is sufficient. 
See the picture below. ableport.jpg PL

Paul Yaw,
It seems most peripheral port experience is with auto guys trying
to increase HP. For an RV-4 160-180 HP would seem ample. Is
it possible that a peripheral port on a 13B optimized for 160HP
at 5500 RPM could be smaller than the 1.75 DIA shown on the
ACRE'S site. Would a smaller port idle better? Would it avoid
the need for an Everett Hatch style idle throttle? The simplicity
and weight savings over a four/six port manifold would be nice.

BTW does anybody have a drag polar for an RV6 or RV4 or
tell me what month and year in EAA Sport Aviation mag
I can find it in? PL


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