I started on the Firewall this weekend and I will say that it seems to be much easier than the 9 firewall. Maybe its just experience but it seems to go together much easier and there are fewer self manufactured parts in this firewall. More detail in the pictures below.
I have a few modifications to make to this next section of the plans. First I had to drill another hole in the firewall for a return fuel line. I plan on having either a EFI fuel return of at least a purge valve to help with hot starts. Next I am cutting access panels into the side of the tunnel so I have better access to the fuel pumps and related fuel system components. That requires a backing plate and a cover plate so I designed a pair and then started the cutting process this weekend (on the CNC). So far I've made two covers but no backing plates. There are a couple of changes that I still don't know about yet that will have to have a modification made to the firewall. First I don't plan on using Van's method of oil cooler mount. It basically bounces the air flow off of the firewall and then back into the oil cooler. I think I can come up with a little better system than that. Second, I plan on using stainless steel eyeball type control cable penetrations and the three small holes that Van's put in the firewall for this purpose are too close together for the 1" eyeball. So a little work will be required there.
|This is the mid fuselage section that Travis and I riveted the floor skins to. Notice the bubble wrap? Well those two bulkhead frames kept poking me in the face...|
|Here are some measurements for the access plate that I am putting into the tunnel walls.|
|And here is the CNC happily cutting away on the first cover plate.|