I can tell you a DLE 20 would be Way over powered. I had (yes had) a OS fs 70 on mine and it was just Way more power than needed. If you want gas I would suggest 1 10 or 15 cc probably 15 would be a LOT of fun

Mine is lost because I had a flight battery go dead...
I have just ordered another and I have to say, I will probably never be without one again... I LOVE this plane as did everyone at my club