Beach Shoot #12 - Half-Tourbillion

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Date: 2003-11-21


Built as an experiment.

12.5 mm ID tube of PVA pasted frozen meal cardboard, A4 80 gsm overwrap. Straight meal propellant, rammed hard. End plugs of wax treated cat litter. Spin and lift vent drilled with 2.5 mm drill.

Lift vent fused with quickmatch leader from spin vent. Short section of bare match to implement delay before lift ignition. Spin vent fused with blackmatch and meal-NC in the usual manner.

Glued together paddle-pop sticks as the stabilizer wing.


Spectacular failure.

It spun up OK, but shortly after the lift vent was activated the stabilizer wings were wrenched off, and the thing started to flop around uselessly on the ground.

Not long after there was an *enormous* report, the side wall of the tube failed. I would imagine it happened as the two burning surfaces from each vent broke down the propellant plug between them, resulting in a large burn surface area and excessive internal pressure.

It wasn't well enough balanced and was too heavy to work, the wings came off too easily, and the case failed to withstand the normal bulk-burn effect of a tourbillion at the end of its flight.


title type size
Test Video video/x-msvideo 2.257 Mbytes
Pre-Test Picture image/jpeg 78.917 kbytes
Post-Mortem Picture image/jpeg 72.535 kbytes