The 555 is one of the greatest receivers Hitec has made. This is reflected in the price as it has a higher price than the 8 channel Supreme receiver. As above you will need to carefully trim the plugs on the Futaba plugs. The HS81 servos are great as long as you pull from the long end. Do not try to mount one side ways. Look at how it's made and you will know what I'm talking about? There's just two screws holding it down and it will rock back and forth.

The HS81 would be an ideal servo for the ailerons and engine. Hitec makes another HS 225 servo that is small and has four screws that people are using in the ailerons of the Kobras with the 30 size engines.

Enjoy,

Jim