I am presently trying out the Spektrum A5030 servo in my E-F1 model. I know this is not the same stresses as Q40 for sure, but just giving them a try for now. If they are successful, I will move to 426 Quickie and maybe Q40. I am running regulated 6.0 volts. Haven't had any "nervous" issues with the servo but I do notice the gear train and motor is more noisey than the 3421. I am using nylon gears in the A5030, 3421 is metal gears. So far the A5030 is working fine and for $20.00 it's a steal of a deal.

The other option is the Spektrum H5000 digital helicopter servo. This is an excellent servo and equivalent or better than the JR3421 in my mind. The H5000 is a $55.00 servo however.


Randy