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My Raptor50 with OS Hyper makes a strange sound.
It almost sounds like the wah wah's, but it isn't the same as I have seen on this forum. The engine works good even when the sound starts.
At first I thought it was the headspeed, since I hear it more in idleup. But I sometimes also hear it in normal. When I give full throttle the sound is gone.
Sometimes I hear it in hover, and almost always in FFF.
The hyper is new (2gallons).
Rave ENV, Stratus BW,Trex700 V-bar,Furion450