Started work on the Avbay.
It'll be along the lines as described by Wolflair in other areas of the forum.
Here's the basic components.
12" coupler tube (CT).
Switch band (SwB) epoxied to middle of CT.
The SwB is just a 2" length of airframe tube. The booster tube and payload tube butt up against either end.
The SwB will be used to house the altimeter switches and port holes.
Stepped bulkheads (BH) at each end. These will house the eyebolt, allthread bolts, eject charge canister and ignition lead terminal blocks.
Sled to house altimeters. Launch lugs 1/4" will be epoxied to edges of the sled and will house the allthreads.
Delta quicklinks 3/16" for attaching the shock cords.
Here's a closeup of the SwB showing 1 of the 3 altimeter port holes.
You can also see 1 of the 3 rivet holes in the CT for fastening the avbay to the payload tube.
Switch holes not drilled in the SwB yet...haven't decided on what switches to use.
Here's a closeup of the stepped BH.
Allthread holes not drilled yet.
Its made of an airframe BH and a coupler BH epoxied together.
The idea is that the allthread bolts pull the BH's up against the CT to make a nice seal to protect the avbay electronics from any eject charges
Here is one of the "closed" eyebolts I bought. It just seems to be a normal open eyebolt with a dab of weld on it.
I've got nice big washers on each side to spread the load across the BH.
I suppose it will be strong enough(?)
I guess other options are a "proper" forged eyebolt or a Ubolt.
I wonder what is the "weakest link in the recovery chain": shock cord, quicklink, eyebolt, BH, CT, rivets?