ORIGINAL: ENO
Thanks for the comments,
The troubling thing is the battery pack was being tested after every fight with a 1amp load and was always above 7.5v. After the crash we checked the sysem again with a 1amp load and the batteries still read above 7.5v. That's what troubling part to us. So we are wondering if the duo run system with the Jaccio 5.7v regulator can't handle the amp load under certain conditions with what appears to be a well charged battery pack. There is a group of here in Chicago on standbye with are CDI's awaiting some info. The unfortunate pilot was Mickey, and he's usually pretty flawless with his setups.
Doc
I'm not an engineer so don't beat me up...I've done a quick search on Li-ion packs and found an interesting discharge curve plotted from cell phone use (single cell)...
At 3.75v (7.5V for assumed 2 cell)...It appears to be a very dangerous curve. If this curve holds true, coupled with the higher current draw on the output of the regulator, the additional demand could have pulled the voltage down causing exactly what happened (again assuming that the engine then Rx failure theory is an indicator of a dead battery)...
I don't really know, but perhaps an engineer type can chime in and offer an opinion about this theory....
Here is the link:
http://www.lenrek.net/experiments/nokia/
Larry Diamond