I started flying gas powered free flights in th 30's and have since gone through many other types of flying. I first flew electrics when the motors came with the kits and used nicad batteries that weighed in at about 1 pound per pack. Mostly sailplane types. I never gave up on fuel power but since the electrics now are so advanced I intend to try again with WWI scale. The power system I need for the airplane I want to build is almost $300.00. There are some very nice four strokes for less but after all it's only money !!!!