Wood prop

Roger that!

You should be able to use the 71” prop you have on a C-85. I have a 71-49 on my C-85 and I really like that setup.

Like I said, a major reason has been the fact O-200 crankshafts are easier to find. Having flown different planes, the C-85 at 2500 can deliver more speed and climb since you can still swing a 71 inch prop, unlike the O-200 which is limited to 68 inches.

Mac, you made(me) have fun Power and pitch it is all up to the owners wants.

OK Larry. So in the C85 conver you have more power bigger displacement, but still swing pitch of your choice. What have you gained. What does the power gain give you?, Or why did Forney go to the C90? Or why did Contin make an engine put out more power be the same outside diam. but yet swing the same props? I will give you all this Wood props are pretty. but for performance it's metal all the way. My Alon c90 53 pitch would run in the 130s all day long. Power and pitch, Same wing but more weigh.

We'll just have to fly to Pandora and talk to the Na'vi and see what we can barter for some. Did not realize I'd start such a discussion! Not sure I want to increase my gph tho.

What I'd like to do is simply lose weight on Tweety and keep the climb performance better than standard but less than what it is now to possibly improve cruise a smidge if that could work out.

However from very good point Larry made, going to a lighter prop means the CG will be different now due to the lighter weight at that distance from the datum. At 6' in height I don't think I can scoot the seats forward to compensate without surgery!

The current prop Tweety has is pitched for climb and is a McCauley 1A90/CF7148 at 23.5 lbs. I read that as a 71" diameter with a pitch of 48" Warren suggests going to a 51" pitch new prop (metal? diameter?) after the carb change to C85.

Throwing more LL100 on the fire, Sensenich replied back to me that "we do have wood props for this aircraft but metal propellers will provide the best performance." Historically speaking from what I have read that would be more authentic to stay with metal. A bit of a newbie quandary to say the least.