Beach Shoot #17 - Flying Hummer

attached image

Date: 2003-12-19


Another Z-bomb like device.

Built exactly like the last device of the same type, a 12.5 mm ID hummer tube, 25 mm long. Wax treated cat litter end plugs, meal propellant. 1.8 mm vent hole, drilled tangentally and upwards at 45 degrees to meet the propellant grain in the center.

Fused with thin blackmatch and meal-NC paste priming.


Worked great!

Soared up 50 metres or more before burn-out. Unfortunately it was too fast to follow this time. Once again it gave a final puff of sparks after a short delay, probably due to slivers of propellant in the corners of the grain breaking loose from the walls due to the high rotational rate.

The device spun up to about 495 Hz, or 29.7 kRPM.

It was not recovered unfortunately.

In the pre-test picture you can see the case extender used to help fully fill the case. It is probably the most important piece of tooling used in constructing these devices, making that last scoup of propellant and clay *much* easier to ram.


title type size
Test Video video/x-msvideo 504.930 kbytes
Pre-Test Picture image/jpeg 44.341 kbytes
Spectrogram image/gif 169.009 kbytes