Of Course ELECTRIC is fine in O.T.S. , as long as it's the same vintage as the Aeroplane . ( Duck for cover Icon  )

Make fun of it all you want the thing is i learned to fly with that type model back in 1986. So this dates even before that. 
The principle was the same I had a tube PVC with 6D size batteries inside. the power was going to the handle which had a switch built in it.
I used copper wires I cannibalized from a electric motor they where tied to the handle and tied with w knot to the 1/16 plywood then routed in to the brushed motor. The wing was a 1/8 piece of flat balsa the stab was a 1/16 flat balsa with cloth hinges the push rod a 1mm piece of wire with a Z bend at both ends. the fuselage was a piece of spruce wood 3/8x1/16.
We made balsa props. The landing gear was a flat piece of aluminium with a 1mm wire through it and the wheels where corks from wine bottles.

It taught me how to land take off fly level some S flying and that was it. It might be a good project even for boy scouts to do.

What happens when your flying wires touch?

Electric motor copper wingdings have protective coating. They will not short.
Jim you are funny.

Think Cox was the last one to put out a battery in the pants pocket powered U-control called the Cox F8F Bearcat Beetle Bomb.  Found one on eBay:


https://www.ebay.com/itm/Cox-F8F-Bearcat-Beetle-Bomb-Electric-Control-Line-Model-Airplane/263431794236?hash=item3d55c22e3c:g:nvgAAOSwLjxaV-ij

 
Found another:
https://www.ebay.com/itm/Cox-F8F-Bearcat-Beetle-Bomb-Electric-Control-Line-Model-Airplane/132468707491?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649

Hello Matt Back in about 1980 I used the Aeromodeller plan for a Cosmic Wind 'round the pole' model and modified it to include a bellcrank. Used enameled copper wire and motorcycle batteries in a back pack and we  flew it a lot . Even some of the neighborhood kids had a go when I flew it in the local park .
Modern batteries mean nobody will bother now with power down the lines as resistance is to high to get meaningful watts coming out of the lines without dangerously highy voltages . Don't like to admit it as I love caster oil and internal combustion engines but those electric models have a lot going for them now especially when they seem to win all the events here in NZ now! I may build Paul Delgatte B25 stunter and would be tempted to use electric so I could fly scale at the Nats with 2.4ghz throttle control . (Electric models won both F2B and C/L Scale at our Nats in January)
Regards Gerald

Motors= https://hobbyking.com/en_us/turnigy-g25-brushless-outrunner-870kv.html
Battery= https://www.hobbycity.nz/collections/lipo-batteries/products/5200mah-4s-60c-lithium-ion-hv-battery