Vuaim,

I believe your original inquiry was based on the cost of Glow fuel eating you up. I have just read all this thread, and can make the following observations:

1. To reduce your cost, a 1/2A plane can be VERY aerobatic and fast, with a .15 size engine, and fly for a month on a gallon of fuel. A .15 size plane with a .25 can fly on 10%, do the same things, and fly two or 3 weeks on a gallon. Plus the planes are not expensive.

2. Glow fuel has half the energy per unit volume of gasoline. Glow fuel requires 1/4 the volume of air to burn, so you can get (roughly) twice the power out of a .46 glow engine as a .46 gas engine. When it is pointed out that you need to carry a spark ignition system with that .46 gas engine, the cost benefits are outweighed... (pun intended.)

3. Gas engines with spark ignition start to become good for aerobatic flying at about the 50CC (3 cubic inch) size, or maybe a bit smaller. Aerobatic planes for these engines are larger than your sixty size, or even your 1.20 size planes. If cost is your main concern, you might want to downsize and stick with glow. If aerobatics is your main concern, you can get terriffic engines in the .60 to 1.20 size, with glow - but your fuel costs are increased over your .40 glow plane.

I see lots of encouragement for you to go with the large gas plane, and I endorse that - if you have the cash. If not, maybe a small aerobatic glow (or electric) plane is what would really solve your cash concerns.

Good luck!
Dave Olson