Originally Posted by miltonboy
BIW. My thoughts on the firewall are to trace F-1 onto a piece of ply and re-cut it to front mount my engine on. I would put F-2 where it is supposed to go, and then build a bass wood truss structure around the motor between the two formers for added strength. In your opinion, would this help give the added strength I need to handle some of the torque and twisting?
That sounds like a good plan Miltonboy, I would recommend a double lamination of 3mm ply or some good quality 6.5mm ply for the motor firewall.
I found the ply supplied with my 109 a bit soft thus allowing the motor vibrate too much.