RE: Barn Door aileron vs. Strip aileron
The term "barn door ailerons" has been misused lately. You see some ads calling wide ailerons "barn doors." This is not normal usage for the name.
The generally accepted use of barn door means an inset aileron at or near the wing tip. It requires a modified wing with a cut out for the aileron. It also leaves room for flaps as seem on many scale planes. For the same area, barn door ailerons are wider and shorter than a corresponding strip aileron.
A strip aileron generally covers the whole length of the trailing edge. For the same area as a barn door aileron, they are narrower. They do not require a modified wing. You build a wing and hang a narrow strip of wood on the trailing edge for control. They were originally designed for ease of construction. The portion near the center of the airplane gives very little in the way of rolling force, but for the older designs with one aileron servo and torque rods, they were easy to install and hook up.
Modern planes, especially fun fly type planes have extremely wide ailerons which has prompted some distributors to advertise barn door ailerons. Technically, these are just very wide strip ailerons, so be careful what you read and look at the plane to determine what type ailerons it has.