RE: HOB Decathlon build
Sorry about the picture not being vertical.
Next I setup the motor mount. As I said in a previous post, I intended to use nylon spacers and bolts to mount the motor far enough forward to have a nice fit with the prop and the cowl. I did a lot of fitting with this, and eventually came up with the length my spacers needed to be. There is a large amount of right thrust built into the model, and its construction (cheeks, motor mount offset, etc) allow the prop to clear everything. Yeah, I know, no kidding. The point is, all this allowed the spacers to be the same length. I used a miter box to cut them. I also fount I had to nip a bit off one corner to allow the motors mounting plate screws to fit. The motor fit near perfect, with the prop exiting the center of the non existent front of the cowl. I also used nylon lock nuts on the back side of the firewall.
I installed the blind nuts prior to gluing in the firewall, and used CA on the back of the nut to secure it.