The sims certainly at least give you an idea of what to do. The PT40 on the sim is pretty accurate once the plane is in the air. On the ground the sim is nothing like at the field, especially if its a grass runway. You will need high throttle just to get the plane to start to move and then you have to back off the throttle to taxi. The plane will then start to change direction all over the place as the wheels hit different levels of grass, small ruts, ect. BTW, I would see if you can send the engine back and exchange it for a 46. A 40LA is a very weak engine and the cost difference by moving up to a 46 is small and well worth it!