Simple answer,

You need 1 servo per surface for 50 cc and usually 2 per surface (except elevator) on 100cc and 2-3 per surface on 150cc (except elevator 1-2).

You should run 2 batts/switches on 100cc or larger. I prefer to run 2 on 50cc as well but most don't

Depending on the type of batt/voltage you may need 2 regulators or 1 regulator that can handle 2 batts.

You need 1 batt for the ignition system (again maybe a regulator depending on the voltage).

Any gas engine I reccommend an Optic kill (or similar device) for the igntion as well.


Now the debate comes after all this.

depending on the ignition and batt choice you may need a regulator

depending on the servo choice and RX choice you may want to run a Power Expander like the Smart-Fly versions.

You don't have to though if you run the correct size batts and have no binding in your system.


I like the Smart-Fly EQ6. It has matchboxes built in, Regulator built in and Optic Kill built in. Only thing extra you would need is a regulator for the ignition depending on the type of batt/voltage you run there.