Donald TheHobby Eagle A3 Super2 is the only HE auto-level product I would buy or recommend. Do NOT get the HE A3 Super3 V2. It will crash your plane in the Auto-Level mode.

Donald That'syour tailwheel. If you have a wire along the rudder, or a noswheel, it could be made to turn with it. Or I guess you'll have to drill a hole into something solid at the rear and cement it into that if it won't be steered along with the rudder.

Donald Thank you Phildo. I almost bought what I thought was balsa. Don't need plywood, which this you say it is.

Donald These should come in about 4 or 5 different wire lengths. Can you post here what length wire yours are? BG won't answer the question. Until we know, I'll buy elsewhere, like MotionRC.com.

Donald Did mounting to retracts work out? I want to do the same with a XB-70 Valkyrie.

Donald Thanks for those measurements. Now I'm wondering what size is the bolt holding it to the mounting piece. I want to put these on a set of retracts for a XB-70 Valkyrie.

Donald You should never run an unloaded motor (without prop) for more than a few seconds for the same reason as written by Trip 786 in his comments - no cooling air. Were you running it while loaded?