With the 52 Magnum turning a 12.25x3.75 on mine, The Nitro version turned out to be a great flying plane. I may add more weight to mine a little at a time in the tail to see how it does. It's really a blast to fly as it is. It's very fast and very agile then at slower speeds it's just as smooth as can be with no bad habbits. It's a great wind plane, it'll cut with through a 25 mph breeze without flinching. It's pretty darn strong too, first couple flights I was expecting it to come apart being as fast as it is. I've not found any problems with running the larger engine on it. I need to get the reciever problem figured out in that one so I can get it back out to the field. It starts shaking once the motor is started really bad, makes for an interesting flight.

When I get the World Models version out of the attic I'll replace the stock 52 muffler with the pits version from Magnum. It's 1.75 ounces lighter.