On Sun, 20 Dec 2015 04:26:39 -0800 (PST), Uncle Monster
wrote:

On Saturday, December 19, 2015 at 5:03:18 PM UTC-6, wrote:
On Sat, 19 Dec 2015 14:57:03 -0700, Tony Hwang
wrote:

Eagle wrote:
https://www.youtube.com/embed/pD_yQZ4iNjY?rel=0

In high school I played with something like that.
Broke whole bunch of window panes. I was not punished.
Principal was forgiving.

We dabbled with all sorts of home made rockets in the early 60s. I am
surprised we survived with all limbs intact.
We had some zinc dust (for sulfur and zinc dust fuel) but it was hard
to come by. Our go to fuel was potassium nitrate and sugar. The trick
was making nozzles but a crossman cylinder was a ready made rocket
motor case (drill out the end to 1/4")
You could saw off the end and press it into an aluminum pipe from old
lawn furniture but they blew out, even if we epoxied them in (that
expansion rate thing).

When I was a kid we played with the rocket kits and factory made cardboard tube rocket engines. Of course we also made bombs. (€¢?€¢)

[8~{} Uncle Rocket Monster

The KNO3 and sugar in a crossman cylinder was a pretty effective
engine with more power than the Estes motor. You could put one in a
Bering cigar tube and never see it again. We shot them out of a piece
of 1" pipe and they really went for a ride. We never really got the
spin we wanted for stability tho. You never knew where they were going
to go.