Single a123, home built, two leads to two switches both going to reciever. Ignition power straight from RX. Use a optokill for ease of stopping the motor if I am not fitting a choke servo, not for more rf protection.

Havea syysa ubec, worked great but dont see the point of one, also used a diode drop down for the ignition in the past, have also stopped doing that as so far have had no ignition failures on three rcxel ignitions and three rcg ignitions on a123 power. I have had one servo fail on a123 power but could notcome toany conclusions over thatas so far it is one servoout of30 to fail on 6 volt plus in 3 years. Pityit was the elevator servo.

I also am not suggesting that others do it my way just posting my results.