what kind of plane is it?? if its a high wing trainer.. you may experience it taking off a bit early. and when landing.. you really have to make sure you flare.. other wise you will bash the nosewheel into the ground and run the risk of it cartwheeling down the runway... for grass, you only need bigger tires.. it will help tremondously. the first few flights will be a learning process.. as long as it isnt grossly longer... shouldnt be too much of a problem.. just a little diffrent.