I have flown quarter scale Cubs with a variety of engines including the DLE 30 and 35. While many consider the 30 and 35 over powered, I consider them almost ideal engines for a Cub with the 30 being my first choice. Except for the spark plug out the bottom of the cowl, they both fit entirely within the cowl and they swing scale or slightly larger props. I like the ability to fly along just above idle at scale like speed’s but when you want to get a bit crazy you have plenty of power to do it with. A DLE 20 is also a good choice for a Cub. I much prefer gas over any glo option. In many cases, it will be necessary to move the firewall back from the kit location.