In assembling the new Pitts this will be my first time with electronic ignition. 2nd gas project.

I will be using 4 servo aileron configuration with two Y harnesses. - 2 channels. Elevators using one channel each - 2 channels, rudder, throttle, main battery 1700 mah and smoke system battery 1100 mah- 4 channels. Total 8 channels used. Electronic ignition - 1100 mah battery. using 7 Futaba 9405 metal gear 80 oz. servos and one 9202 for the throttle.

A few questions - Haven't gotten the DA 50 in yet, but from what I understand there is no connection to the RX. It's a completely separate isolated system and to be mounted well away from the RX.

I am using three batteries ( ignition 1100 mah, servos 1700 mah and smoke 1100 mah) and want to back up the main servo battery with a back-up battery and switch system as well. How do you do this when all eight channels are taken?

Is there a battery box to slave two batteries together while not draining power from the back up battery unless the power in the main drops, or the main switch fails? If there is, what do you guys use as a quality back-up system? Your opinion on how I am planning on setting up the Pitts II are welcomed. This would have four batteries after adding a back up for the servos. Make sense? Is there a better way? Weight concerns? Is a back up battery overkill? Would really appreciate your thoughts and help on this?