PTS stands for Progressive Trainer System—groundbreak-ing new technology that allows pilots to progress from learning to fly to performing sport aerobatics without having to upgrade or buy a new airplane. Clear plastic NACA droops attach to the outer edges of the wing, providing beginners with extra stability during training and manipulating the stock airfoil to produce added lift. The fixed landing gear features a special speed brake system that keeps the flying speed down, making the Mustang easy to handle. 2-position flaps add drag, and can be later upgraded to functioning flaps by adding a servo.

Once the pilot has mastered the basics of RC flight, he can quickly and easily remove the droops and speed brakes, instantly transforming the ready-to-fly trainer into a smooth-flying sport plane able to fly a variety of aerobatics such as loops, spins and snap rolls.