ORIGINAL: Airbike-RCU
I've been using the electronic kill switch from RCAT that Richard posted above. So far so good. One on a DA 50, the other on a BME 50, I'll need to get another one for my ZDZ80.
It is small and lightweight and at around $20 or so, costs even less than a servo.
I see that RCAT offer three but only one is fiberoptic the RC-100FO and costs 49.95$.
Can't using the other RC100 and RC110 units still put you at risk of RF interference since your hard wired from the ignition back to the Rx?
Pete