Firewall Fiberfrax insulation mostly complete

After the panel was riveted, we finished attaching the fiberfrax to the firewall:

Firewall fully covered with Fiberfrax, minus penetration openings

Adding sealant to the Fiberfrax for attaching the titanium foil

Spreading the sealant in the firewall recess for attaching the titanium foil

Firewall fully covered with titanium foil, after initial edge sealant application

When applying sealant to the edges of the titanium, we actually made a big mess which will require significant cleanup and then sealing it up again in some parts, before reattaching the engine mount.

Messy sealant application which will need to be cleaned up

We then opened up all the same firewall penetrations through the titanium foil, which had to be done mostly with a carbide carving bit, and being very careful not to eat up the firewall steel. We also riveted the titanium to the firewall where the titanium sheets overlap:

Firewall titanium foil riveted in place

As the last remaining step from section 27 (Firewall), I also attached the heat valves to the firewall:

Heat valves installed in place, with sealant around their edges

And finally, we riveted the wire passthrus on both sides:

Firewall with heat valves and wire passthrus attached

Next we'll finish cleaning up the sealant on the firewall, and then we'll start actually getting ready to hang the engine for real.

Time lapse:

Total engine mount and landing gear rivets: 14
Total engine mount and landing gear time: 44.2h

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