For my next project, I'm planning to build a
rocket to get some experience with electric
deployment... I'm thinking of a "single event"
deployment setup (the more complex dual event
systems can come after I've got some experience
with this one).
I'm describing the plan below, and would welcome any
suggestions or comments.
- - --- - --- - -
PML "Miranda" kit (3in. tubing, 3ft. main airframe
plus 1ft. payload section)
1 extra piece of 3in. Quantum Tube
1 extra coupler-bulkhead assembly (+1 in the kit)
1 "Intellicone" (3in. plastic nose cone with built-in
Use the rear 18in. of the pre-slotted kit airframe.
Install fins and engine mount per kit instructions,
but do not attach the piston strap to the engine mount
tubing. (Assemble the piston in the normal manner, but
do not connect the free end of its strap to anything at
Install 1 coupler-bulkhead assembly (CBA) in the front of
this rear section.
From the remaining tubing, cut 1 24in. piece and 1 6in.
Fit the coupler of the second CBA into the front end of
the middle (24 in.) piece. Drill screw-holes through the
airframe wall and the coupler tubing. Install T-nuts on
plywood pads inside the coupler behind the holes, enabling
the coupler to be fastened into the middle tube with screws.
Install a terminal block on the rear of the bulkhead, and run
a pair wires from the terminals through a hole in the bulkhead.
Apply glue to the hole to make an airtight seal. Install the
bulkhead in the rear of the prepared coupler. Glue the front of
the coupler into the rear of the front (6in.) tubing section.
Mount the alitmeter in the electronics compartment inside the
nosecone, and insert the nosecone into the front of the forward
tube section with the wires from the terminal block running
to the deployment output of the altimeter.
Assembly for flight:
Connect an ejection charge to the terminals on the rear of
the front coupler. Connect the strap of the piston to the
eyebolt of the front bulkhead, and run the forward end of
the recovery harness through the center tube to the D-ring
on the piston. Push the piston into the front of the center
tube, and attach the front section to the center section with
screws. Pack the parachute and harness into the center section.
Attach the rear end of the harness to the eyebolt of the bulkhead
on the rear section, and slip fit the rear section into the
The result will be a rocket with the same overall length and
external configuration as the original kit design, but an
altered ejection layout: the chute will eject rearward out
of the center section, with separation between the center
and rear section.
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