The grass hopper T38
A T38 https://m.youtube.com/watch?v=Um_kDEy8I20
The bungee was probably 50 feet long and a Y form.The base of the Y was attached to the release mechanism of the T38.the rear was attached via a release and rope to a stake in the ground. About four strong kids would take up the tension on either side of the Y.when a certain tension was reached the pilot would release the rear and the T38 would hop into the air.The trainee pilot would try to do a slight turn maybe before landing on the skid. At 613 sqdrn we couldn't be bothered with the bungee so we winch launched it up to probably 800 feet. It then dropped like a brick and we just about got back to the take off point!.White Waltham however informed us later that the T38 was not built to be winch launched !