I find the electric have as much or more power than the gas. I fly a CG Eagle 400 (21oz) with a E Flite Park 450 on a 2000ma battery for 15 minutes or more and that is not treating the plane nicely. I also have GP Super Sportster (3.2 LBS) with a E Flite Power 15 on a 5350ma battery and fly over 15 minutes. I can not say for sure about larger planes but I just finished my converstion on a GP 40 Ultimate with a E Flite Power 60 on it and figure I should get about 15 minutes on it after I get all dialed in.