Here we go. Nope, that's impossible, it's NOT a prop issue. Prop issues are for fine-tuning and getting torque in aerobatic situations or slowing something down or speeding it up a bit, but you can't simply take a plane that previously had a 14-inch prop on it and install a gasser that takes a 22 X 10 and expect it to fit or fly right. First, the prop is too long and will likely hit. If you go to a 3-blade, something's gotta give there, and once you get something pitched up there that fits and works with the engine and doesn't over-rev the engine, you're going too fast at idle. Reduce the pitch and it will over-rev the engine. Throttle it down so it can't open up far enough to over-rev with the lesser pitch and you've completely undermined the reasons for placing a big engine on there in the first place! I've spent at least 20 of the past 27 years watching guys tell me that installing that big engine won't bother anything too much, and then watched them try to figure out....1 by 1.... everything I just listed above and a whole lot more besides, like how the heck to slow it down on a hot-top runway...... Like I keep saying, if model planes were really meant to hover they would have collectives in them like the helis do. See, THEN you'd have me...no arguing with the ability to kill all thrust or even reverse it! Auto-Free rotational landing brakes.......

Jim