Thanks for all the info guys. I got my Formula 3D in the other day and have it built up to mounting the engine. The wing hold down bolts were not to my liking and the holes in the wing were drilled at the wrong angle so I replaced the machine screws with 1/4 20 nylon bolts that I drilled and tapped. I do have a question for you guys. The engine mount seems to wide apart for any engine. I bolted the mount to the firewall and then sat my Saito .82 on the mount and when you look down through the holes in the engine flange you can see daylight on the inside of the mount. What did you guys do about this problem??? I looked at the dimensions from hole to hole on the Super Tigre G90 and it's 1.97 from side to side and that still isn't wide enough. The mount is kinda flexable and I was wondering if you could squeeze the end of the mount together a little and then mount the engine and drill the holes???