Originally Posted by stegla
I have a 1 cell indoor model with a 5g outrunner that makes strange squealing sounds at part throttle. I just fly it and try to ignore the noise.
I did have problems with a 24mm fan using the long-can 10mm eflite inrunner. It just misfired at part throttle settings. Nevertheless it flew ok!! However, the problem cured itself when I rearranged some of the gear to alter the cg??? strange!
Try a big battery to see if it is a LVC issue.
I'm using an 850mAh batt intended for the plane...I do know that twins can get into harmonic issues...I have the same motors/fans running in single engine planes with no issues like I'm having in the twin engine F-15...I could check the motors individually but that would mean removing shrink tubing and de-solding components...YUCK!!!...