I'll be the first to give you first hand experience with this new g20. It is a bit heavier that a comparable sized glow engine. Total weight is something like 41 ounces with everything. That's 3 pounds 3 ounces. and it's making 1.7hp at 8500. A good saito will do that and be almost 1/2 half that weight.

That being said, If you are going to put this into a 3d plane with loads of wing area you would be just fine. Now I just witnessed last evening someone that has this engine in the Aeroworks Edge540. My first thought was way too heavy. I'm not sure what the plane weighed. Anyway, we started out on a APC 15X6 and saw 9400 ready to fly. We switched to a APC 16x6 and got 8800. Now this is on an engine that was just started for the first time and did not even have a 10 ounce tank of fuel through it yet.

We flew it with the 16X6 and power was pretty darn good. It went vertical in a hurry but lost pull up around 1000 feet, so it's not unlimited but plenty. No extreme stuff was tried but this little engine pulled through very large loops, which did not even faze it, hammerheads were a breeze.

Now as far as RPM's go, remember that this thing tops out in HP at 8500, Redline is 10000. So turning a prop much over 9000 is just mainly a waste. Torque is what turns the prop and helps to overcome the load from going vertical. I'm thinking that a 15X6 for the first 3 or 4 gallons so as to not overload/overheat the engine then switching to the 16x6.

It's pretty common to think in terms of a glow engine when you first switch to gas. Most things carry over between the two, but props and needles and especially breakin procedures do not. For gas you prop to have the engine at the top of it's powerband, not max rpm, in setting the needles, you do not richen them for breakin, you richen only the high speed needle by only 100 or so rpm and that is only just to not have it go lean in the air. The low speed needle is set for the best transition you can get. Breakin is handled by the oil ratio not the rich settings of the needles.

Once you remember those three items, learning how to deal with gas becomes a lot eaiser