I'd say the LawnBoy is a perfect candidate for a conversion. I've run them for years and they're pretty tough, they'll take a good prop strike without damage. I'd say a hidden stump or a kid tossed rock in the lawn is the same as any prop strike it may encounter at the flying field. And another reason the LawnBoy would make a conversion: you already know it will swing prop well, under load. After all that's what it's made to do.