It serves to hold the nose cone. The Nose cone extends into the
payload section 18".
Directly under that is the main parachute, and under that is the the
At the aft most end the main coupler will be epoxied to the end.
The aft most section of the payload section contains the hatches (on
both sides) for the primary and backup electronics bays.
The main bulkhead serves as the main chute attachment point.
Two layers of 3/4" plywood were epoxied together and the joined with
Two stainless steel u-bolts will be the main chute hard points.
The four notches around the rim are for the main chute wiring.
6 ribs of 2.5" wide, 6" long, 3/4" thick plywood make up the lower
supports for the main bulkhead. These ribs will keep the bulkhead from
traveling aft during ejection.
These ribs are epoxied to the payload section and bolted with two
1/4-20 screws each.
This first picture shows me apply and epoxy bead to seat the main
bulkhead. What may not be clear is I'm in the rocket to about
mid-thigh level to do this step.
Seating the bulkhead
Here's a forward (first) and aft view of the main bulkhead.
The forward support are the same thickness and width as the lower
Holes for the T-nuts were wetted out with epoxy before driving in the
Over-kill? Maybe, but at 663 pounds on the pad, what would you be
Forward supports Installation
The forward support are epoxied and bolted to the airframe in four
Not sure if the epoxy or the bolts will be holding the entire load.
With bolts alone the force will be 83 pounds per bolt.
With epoxy alone this represents 7 PSI.
Between the two it should hold, and we will all know the answer when
I like to say a special thank you to Melinda Catalano for her
assistance in getting the upper and lower supports bolted down.
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THE BLACK BRANT PROJECTon the verge of insanity