alcohol burner

My Feedback: (48)

I have an Ace 4-120 biplane that I received off a fellow RC member in our club.....He has passed away, and I have a question about the plane......I have a Super Tigre 2300 on it with a tuned pipe. I have no plans with this plane. I checked the C.G. right on or slightly behind the main spar on the top wing. According to this, it is just slightly nose heavy which I would think would be just fine. However when I flew it today...I have about 1/8 or slightly more Down trim in the elevator....this is telling me tail heavy, but when I fly it inverted, I have to hold Down in it even more.....I brought it home and I rechecked C.G. again. Checked thrust of engine also. It has about 1-2 degree right thrust in it......I would also assume this is ok. I guess now I am thinking wing incidence is off. Can anyone tell me what the top wing and bottom wing incidence should be on this plane? I have no experience with biplanes, but I do build other planes from kit form, but have no idea on this one.....Any help would be much appreciated....thanks......Tim

dmcmike

My Feedback: (14)

Check all the incidences, upper and lower wing, motor and elevator. I've flown bipes for years, and have found that if you run the lower wing at 0, upper at -1, elevator at 0, and engine at -1 to -2, you'll really start to enjoy the way it flies. The only other option I would suggest would be to get a 4 stroke for it.