You can in most cases use the weight of a plane to glue you a clue. If the plane is less than 12 lbs. then you can pretty much be assured that it will fly with a glow powered engine. Anything over 12 lbs. will be more cost effective to go with a gasoline powered engine. There are bigger glow powered engines but they can go through 14 plus oz. of fuel in one 10 minute flight. At around $25.00/gallon for glow fuel, it actually makes gasoline look like a cheap alternative!! [X(]