Around 2007, when I was heavily into flying radio-controlled aerobatic model airplanes, I outfitted a roughly 20-percent-scale Zlin Z-526 Akrobat model with an electric motor and six-cell lithium-polymer battery pack.
I figured the newer batteries, unlike the nickel-cadmium cells I had experimented with for years, would provide enough power and endurance to complete the demanding aerobatic sequences typically featured at contests. I was also looking for a level of performance that would impress my casual Sunday sport-flyer friends, who were not yet convinced of electric power’s potential. Switching to electric motors from the single-cylinder two-stroke and four-stroke internal combustion engines we had used for decades was a big step among modelers. We used electric power for the occasional self-launching glider but little else.
