Paul

Nice to see someone thinking about keeping things light for better flying.

If you use 2 2 cell A123 battery packs of 1100 may that will weigh the same as your single battery. I have these batteries in one of my small turbine planes and can fly up to 4 flights per charge, though you would need to confirm. You would save the weight of the BEC as it is not needed. Further weight savings could include doing away with the UAT and replacing it with a pleated paper clunk in the tank, which is all I do on all my jets. You could save a little more weight by ditching the Gyro and you could cut your equipment board down in size.

If you have time to look though the huge thread you would find that Paul Gray had the lightest installation with no equipment board, just the various components velcroed on the fuselage sides. He managed a dry weight of 8 lbs though I never managed to get mine as low as this! You unfortunately have to install brakes which adds weight due to your regulations. I would do some tests and see what the current consumption is, I would guess it is very low and you could possibly use the ecu battery with a Y lead to power the retracts. These little cells are amazing with the high C rating. I have even used them in 3 cell packs for Kero starting.

John