Hey guys I just made a bungee laucher , using 20 feet of bungee cord, 10 feet of light rope with a leader of 6 inches with rings attached. The cool part is the laucher is servo actuated by a female plug on the belly of the plane, with the male end of the servo plugging in it going to the gear channel, So far ten plus flights have proved flawless!. I used 15% on the rail angle, A little up input at lauch, you'd think it was taking off a runway! I'll take a pic and post!