flyrotary@lancaironline.net Mailing List Archive

Wow, Forward CG on an RV-10 with a Renesis? I'm flabergasted! Unless your engine CG WAY forward of where the stock O - 540 is mounted I don't understand how you got there, even with the supercharger. My RV-8 with a 20B is turning out tail heavy!

Like Ed said, Pay attention to those ounces during construction. They turn into 100 pounds when its finished :>)

Tracy

2009/4/1 Bobby J. Hughes <bhughes@qnsi.net>

Phil,

Just as a reference my Renesis RV10 came out with a forward CG. Added 13
lbs of tail ballast until I can relocate one battery after phase 1. With
the ballast N416AS matches Van's factory RV10. Firewall to prop flange
is 47", with a 2.25" cowl spacing. The MT prop is 39lbs. The super
charger is about 25 lbs with mounts. Two radiators, oil/ water exchanger
and two batteries are on the firewall. I also have a full interior and
IFR stack.

If I was mounting a 20B I would stick with 47-48" to prop flange and
move one or both batteries to the standard position. Radiator placement
with coolant and prop weight would need to be considered.

Extreme Composite's
http://www.extremecomposites.com/aircraftparts.htmlhas the molds for my
cowl. The mold was made to accommodate 53.25" to 49.25" from prop to
firewall. Spinner is 15". They also make the cowls and 15" spinners for
the F1 rocket. The upper and lower parts are just shells so inlets can
be added as needed. Talk to Jimmy if your interested. The cowl was a lot
more work then I anticipated.

I have two 400ci radiators with an oil to water exchanger plumbed
between them. No issues with ground cooling during extended runs.

Bobby
(wondering how my plane gained 100 pounds)

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Phil White
Sent: Wednesday, April 01, 2009 7:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] 20B mated to RV-10

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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