I had this plane and remember trying a retract servo I had on hand and it didnt work out. It struggled operating them. I do know it wasn't a Hitec 75. Cant remember brand, its been around 7-8 yrs ago. I ended up getting the JR's which were great, but pricey. I think you're gonna find the Hitec wont work good since their only around a 100oz and the JR's are 260oz and they used every ounce working the retracts. I do remember that. And the JR's are Metal gears and the 75's are not.