I bought metal gear retract servos from Hobby King to save money. They retract fine on the ground but not in the air since I run 4.8V. The aerodynamic loads are too high. To get them to retract, I have to do point rolls and sustained upside down. Even that does not work all the time.

I have bought some voltage regulator so I can run regulated 5.9V into my 12 ch 2.4Ghz Futaba receiver, which is rated at 6V max. I understand that people have no problem with unregulated A123 6.6V but I do not want to take a chance with my $200 receiver. I believe the cheapy HK servos will retract with no aid at 5.9V. We'll see.