Purchase any model kit and get $10 off any radio system purchased at the same time! to qualify for this deal your cart must contain the kit, radio and coupon when submitted.. Boats serve many purposes: carrying cargo, rescue or wartime missions, recreation, etc. the shape of the boat helps to determine its effectiveness in completing different tasks. some of the parts of the boat that play a role in the way the boat moves are the hull and keel. by experimenting with the. A radio-controlled aircraft (often called rc aircraft or rc plane) is a small flying machine that is controlled remotely by an operator on the ground using a hand-held radio transmitter.the transmitter communicates with a receiver within the craft that sends signals to servomechanisms (servos) which move the control surfaces based on the position of joysticks on the transmitter..