I recently completed 3 sets of retracts for BT 81 Mosquito's. Check out the builds on Rc Groups under "Mosquitos in formation".
Here's a pic of the LG,made from HobbyKing oleos, some aluminum and steel arms. They have been tested but not used yet. They will have a 12kg servo each for operation. Weight is approx 12.5ozs each with the 5" wheel. flying-barely
