rbort
Elite Veteran
Location: Franklin, MA - U.S.A.
My Posts This: Topic Forum | YupI just put in the spare motor with the G26 carb already set and went flying. Didn't change throttle curves or anything else, just let the gv-1 manage it. 231 runs slower with the same throttle opening so you need to bring up the curves if you want to match them right but its not essential if they are lower than gv-1 speeds the gv-1 can handle that very well. On the contrary if they are higher then you get a speed up and slow back down when you switch flight modes with the gv-1, better to be on the lower side with curves than higher than selected head speeds.
Granted the 231 likes to run a little faster than the 26 to make the HP that the 26 can with slower speeds, but I just flew it with my standard settings. My upper speed is 1800 and I don't know about anyone else but when I turn up the head speeds more and more all I see if the speed become more variable as you add collective and/or cyclic during maneuvers. So if the motor is supposed to make more power at higher speeds, well then I can't see it being good as its not consistant power and OK maybe its making more to turn the head faster but it loses its balls to maintain it. Think of flying giant scale airplanes: full throttle on the way up, fast idle on the way down, half throttle in level flight and you've got a constant airspeed. Well I thrive to maintain a constant headspeed with my helicopter and all maneuvers look and feel alot better with the sticks.
So yes the engines are interchangeable. You just need to find head speeds where the motors are happiest at for your flying style and tastes and go with that. Different gear ratios can be compensated for within reason by adjusting head speeds. In other words with the stock Spectra it was optimized for a 231 at 1800 rpms with 7.15GR. Well if you have 7.08 then just turn the head at 1820 and you're right on the same motor target rpms again.
-=>Raja.
1005 Gasser, G26 3DMax++, 2205+ flights
Spectra-g, G26 3DMax, 865+ flights |
