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Hi Phil,
I have a 20B installed in a Lancair ES with about 110 hrs on the Hobbs. Bobby Hughes has a supercharged Renesis installed in an RV-10. On my installation, I came out pretty close to the recommended CG. I was able to use the stock Lancair cowl (with the addition of a chin scoop and the "Dolly Pardon" treatment). Have you checked the CG numbers on your engine placement? The FWF weight of a N/A 20B should be very close to the FWF weight of an IO-540. Yours appears to be quite a bit forward, but maybe that's the camera angle.
My cooling system consists of an aluminum Ford Galaxy radiator (don't recall the exact dimensions), but it is about 800 cu in. It is mounted under the engine/psru and fed by a chin scoop. The oil cooler core is approx. 10 x 11 x 3 and is fed by the left cowl inlet. Right inlet feeds the throttle body.
The water temps were good but the oil temps were too high so I installed an oil-to-water exchanger. This brought the oil temps down significantly and also helped the water and oil temps to track each other more closely. The last thing I did was to install a servo powered cowl flap. This helped to reduce cooling drag in cruise flight.
I can take some measurements this weekend if you need more precise numbers.
Mark S.
2009/4/1 Phil White <philwhite9@aol.com>
After much head scratching, I have managed to attach my 20B to my RV-10. I kept the Lyc dynafocal mount, in case I fail in making the rotary work satisfactorily, or if I need to sell to some cretan who doesn't believe in engines with only 4 moving parts. I managed to get the prop flange within 1/4" vert and 1/2" horiz of where I wanted it, tho it is 51" from the firewall compared to the stock location of 43". Guess I get to build a sleek turbine-look cowling!
If anyone with a proven cooling system design for the 20B can provide radiator sizes and source(s), it would be most welcome.
Phil White
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