RE: New 81" P-47 ARF coming from Hangar 9
If the pics in the manual are any indication, the retracts look pretty stout. The frames look a lot like Spring Air 400 series 1/5 scale retracts, so they may be a good air substitute if needed.
I fly Airtronics Stylus radios, and Airtronics makes a proportional retract servo that can be slowed down through the radio. Should work good with these retracts.
I have also seen some robot company that makes a kit to turn a standard proportional servo into a 180 degree throw. That would be an option too. Saw a link not too long ago here on RCU, but don't remember where. I'll post it if I see it again.