Hi Carsten,

When I first read your comments I wondered if the voltage spikes could also be coming from the servos. According to Emcotec this can be a problem with the new powerful digital servos we are running (they call it the dynamo effect), they actually have a small filter capacitor available to plug directly into the receiver that should cure this... Might be an easy fix, that is lighter than an additional ignition battery.

[link=http://shop.rc-electronic.com/e-vendo.php?shop=k_emcotec_e&SessionId=&a=article&Pr odNr=A18000]http://shop.rc-electronic.com/e-vendo.php?shop=k_emcotec_e&SessionId=&a=article&Pr odNr=A18000[/link]

By the way, if you do the test with the servos, maybe it would be better to use a model that vibrates a little more than a jet. My best guess is that the dynamo effect (or whatever we call it ) is most pronounced when the control surfaces vibrate, and this is probably not as pronounced on a smooth jet as with a regular glow-plug engine.