ORIGINAL: shd3920
So elevator, rudder, spoilers?
How do the spoilers work? One separate gimble stick (is that what they are called on the TX?) for each spoiler with 2 separate servos? Or one servo and one gimble stick operating the two spoilers like flaps?
Spoilers do what the name implies. They "spoil" the flow of air over the top of the wing which causes a loss of lift in that portion of the wing. Without lift that wing drops relative to the other wing. If both wings have spoilers deployed both wings lose lift and the plane requires more speed to maintain a constant altitude. In the deployed position they can also function as "air-brakes" during descent causing the plane NOT to speed up as much while descending. How much depends on a number of factors. Spoilers tend to be less effective in roll control at lower speeds than ailerons.