IMAA Requirements for Electrics?

[Rob Schaffer]

Can someone review the IMAA flight requirements and how I need to provide for them on an electric aircraft? Servo torque isn't a problem, and I don't feel that I need any redundant systems in the radio, but what about the "Engine kill switch" ? Will they accept the use of a Shunt to kill all power to the system?

I'm about to begin building on my TF Arrow, which meets the 80" span requirement and I would like to think ahead on some of these items if needed.

Thanks

[staggerwing]

Rob,
I've been an IMAA member since its origin & have not seen any mention of the kill switch rule as applied to electrics thru memos to our club which is IMAA sanctioned or in the "High Flight" magazine.
But it is a good question which may be best answered by e-mailing IMAA which I will do also.

Our club, the Binghamton Aeros, will be hosting a 3 day IMAA regional Mini Fest
at the Chenango Bridge Airport this Aug 10th thru the 12th & hope to see as many elec participants as possible.---plenty of camping room at this beautifull grass strip dating back to the 20's.

Bob

[davecee]

I've flown my electrics at IMAA events. The stated intention of the kill switch is to be able to shut down an "ignition" engine. There is as yet no written requirement in the IMAA safety code that requires a "kill switch" for electrics. There is, though, a requirement that the engine be able to be stopped from the radio. Usually than means closing the carburetor with the use of the throttle stick. I can stop my electric motor with the throttle stick in the same way, so I feel that's OK until the IMAA says otherwise.
Dave

[Ralph Weaver]

How would the IMAA suggest using a kill switch with glow. Now that they allow electric, I'm sure they allow glow. ;)

[jonnyjetprop]

They don't. The requirement for a kill switch is just for gas. Many gas engines can't be shut off by closing the carb, like a glow can. You use a switch mounted on the outside to kill the ignition. What they are requiring is a way to shut the motor off by radio control in case of a problem.

John