Well, work has started again on the Excalibur!
When I left off I was at the point where I could dry fit the fins and cockpit. The engine mount was done.
Over the last few evenings I've fitted the launch lugs & engine mount. I had originally intended on using a 1/2" stand-off but in the end I've decided to use standard launch lugs - just extended out a little.
Lunch lugs have been drilled through the body tube with a washer and nut to secure in place. I've added a dob of epoxy over the nuts to make sure they remain secured. Once the engine mount is in place, I'll have no way to access them.
Next up, engine mount! No photos of this - step, but I slipped the engine mount into place with a temporary centering ring at the top, since I wanted to be able to remove it once the epoxy had cured. As I had cut the fin slots, this is where I injected the epoxy.
With the engine mount in place & epoxy cured, I moved on to fitting the fins. Nothing exciting here - fins were eye-balled since a 4" rocket just won't fit into my fin jig
With the fins in place, I added internal fillets - this... this was no easy task! I ended up drilling a couple of small holes along the fin root and injecting epoxy with a syringe.
Once the internal fillets were done, I foamed the rear end -
Foam. Horrid, messy stuff - but my fins aren't going anywhere now!
Krusty