A friend of mine runs a Super Tigre 45 on his Twist. I run a 52 Magnum on my twist. Both planes use a 12.25x3.75 prop. Mines quite a bit faster and will hover easyer. We're at 6780 feet altitude so it's hard to get anything to hover. It's up to you but I'd go with the Magnum. Some people have had bad luck with Magnums but that's all I run and they run great. I think they may be using low castor fuel. I recently crashed the Twist in an oops and the engine is on an Ultimate Bipe now.