RE: Build - New Version CARF P-51 Mustang
The standoffs I ordered from PSP arrived so it was time to install the motor. An electric motor can be installed closer to the spinner than a gas motor so the first thing needed was a new firewall. I used a contour guage to get the correct shape of the bottom of the fuse and cut out a couple formers from 1/8th inch aircraft ply and laminated them together with epoxy. I taped a couple of standoffs together to get a length of 3.25 inches and tack glued them to the original firewall. The new firewall was pushed against the standoffs and hysoled in place. This allowed the transfer of the right thrust and down thrust from the original firewall to the new firewall. The next day the firewalls were drilled and the top two standoffs were bolted in place. These standoffs anchor the top of the new firewall and prevent it from moving. Next, the motor was installed using 2 inch standoffs. I also received some 4-40 counter sunk flat head slotted machine screws from Micro Fasteners. I'll be using these to secure the cowl.
Kirk