RE: Which plane for a beginner?
A buddy box is when you hook two transmitters together with a special connector that plugs into ports in the transmitters. The instructor holds the master that controls the plane. On the master is a switch that when held allows the second box, the slave or buddy box, to have control over the plane through the master box. This allows the instructor to quickly recover the plane by releasing a switch instead of grabbing the other transmitter.
The P-51 PTS is not really hard to fly, it's just not as forgiving as a flat bottom airfoil trainer. Flat bottom airfoil trainers will have a tendency to return to level flight when the controls are released while in a bank, climb or dive. The PTS, with it's symmetrical will be more aerobatic with the training aids removed and makes a great second trainer. The PTS also lands a lot faster, and the slower a plane flies in the pattern and on final the easier it is to learn how to land. Most trainers are tricycle geared which is also easier to learn take-off and landing over the conventional, or tail dragger gear of the PTS.
Hogflyer