Hi,can anyone tell me what rpm I should get wuth a g-26 with a 18-6 prop.I,m getting about 7700 rpms now.The engine is on a G.P.super stearman.
thanks Fred

Depends on the brand of prop.

Plan on about 8000 with 18-6 APC wide blade and stock muffler.

More with aftermarket louder muffler.

I'm getting 9000 with an APC 17x6 and performance in the air on a 14 pound airplane is very, very good.

Jim

Hi I,m using a 18/6 classic with aftermarket muff.still only 7700 rpm,s.I have about 3 gals through it.I have been told it will get better with 5 gals through it what do you guys think? I have a 17/6apc maybe I should try that,the plane is about 14.5 lbs.
thanks Fred

Try it, you'll like it.

Jim

Hi FFDQ, I am running a 18x6 wide APC prop on a G26 on a older hanger nine stick and I turn it a little over 8200 RPMs. I run a 17x6 standard APC on a G23 mounted on a Jerrys big boy and it turns about 8600RPMs. Have you peaked the G26 engine? I am running a B&B muffler on the 26 and the stock muffler on the 23.Hope this helps you know to expect from you engine. Wayne M.

hi Waynem, Do you think there is much diff.in a apc or a classic prop,also what do you mean have I peaked the g-26.I,m using a b&b type muff.
thanks Fred

Hi Fred, What I mean by peaking is leaning the high speed needle, the one on the outside. I lean mine to peak RPMs and then back off about 200 RPMs. I do this after seting the low needle for good transition from idle to wide open.I dont try to get every RPM from my G26, but I want it almost at max. I have only ran APC props on mine so far. On my G62 I changed from a Zinger 22x8 standard prop to a Menz 22x8 and saw a big differance in performance. Not so much in RPMs but pulling power, so there is a big diff. in props. You have the B&B muffler and I would try the 18x6 wide prop. or the 17x6 would be good also. You will turn it more,but on a bi-plane I would think you want pulling power instead of speed. Hope this helps Wayne M.

hey Wayne, I have a 17/8 apc prop and will try that and I will get a 18/6 wide apc and see witch one does better.I have not peaked the high end but did richen the idle.
thanks Fred