thousands of flights- have had ignition develop an internal short and fry the receiver because the ignition and engine switches were located next to each other. Postmortem revealed that when you propped the motor over there was a spark going between the ignition on off switch to the receiver on off switch. One fried receiver was the result as well as a bent plane. One foot of separation between anything ignition and receiver is recommended for a reason... Kind of like checking the chamber is empty when handling a firearm. If you do everything else right it probably wont cause a problem but if you don't and inadvertently pull the trigger. It could be very bad....