RealFlight does not model P-factor or engine torque in their sim. They do not model rough surfaces, or grass, or slopes , divits, etc. Take-offs are easy and straight forward in RealFlight. They're not in real life - especially with something like that Top Flite P-51. RealFlight does not model stalls correctly and stall recoveries are quite easy in their sim ... they're not in Real Life. Landings are easy and straight forward in the sim, they're not in real life.

Sims are great for training your thumbs, for keeping up on your skills during the off season. But, they are not capable of telling you how a particular airplane will fly under certain conditions.

Keep in mind that RealFlight is a sim that contains the planes sold by Hobbico - RealFlight is part of GreatPlanes and GreatPlanes (Top Flite, Goldberg, etc) are part of Hobbico. All of the planes in RealFlight are much easier to fly in the sim then in real life. KnifeEdge Software does not model the physics of the planes in the sim to match the real planes ... a look at any of the planes physics will show a vast difference in weight, power settings, control surfaces, etc. for any of the planes that are in RealFlight - especially their trainers. The planes are specifically modeled to make them fly easy. If you can fly the plane in the sim then you can fly the plane in real life ... or at least that's the goal of RealFlight. That way GreatPlanes/Hobbico will sell more planes.