Very interesting. I have a set of electric retracts here for a P-40 and adjusting the voltage will adjust the speed of them. I wonder if you were drawing too many amps at a lower voltage... I may have to play with this. My other plane with retracts, the F4U, are servo actuated so I can slow them down with my Tx in the speed menu. I guess we will see when I get this new plane built lol. Going to be a while. It's nothing but toothpicks right now lmao.