I don’t think the primary safety issues have anything to do with launching
underwater.
Sent from my iPhone
On Apr 15, 2020, at 5:52 PM, Jeff Stai <wk6i.jeff@xxxxxxxxx> wrote:
On Wed, Apr 15, 2020 at 5:43 PM Bryan Langholz <langholz@xxxxxxx> wrote:
I just looked this thread over, so sorry about the late addition. But, I
don’t see why people are so down on it. It’s a bit strange obsession,
launching rockets from under water, but not that much that much stranger than
what other folks (well, me sometimes, (not rocketry)?) do. The only “bad”
thing I noted in the video was that he seemed to be launching in a populated
area (something I have NEVER been guilty of, don’t ask). He wanted to be able
to see what was going on in the water, so using a glass container seems
reasonable. I don’t think there’s any chance that the glass would shatter
because of heat, the water would serve as an insulator.
I did learn some things I didn’t know. In particular, a black powder rocket
motor can burn without air (oxygen). So, I infer that the chemical reaction
creates its own oxygen. Sure enough, a search says that the O3 in the
potassium nitrate supplies the oxygen. This means that an Este motor would
burn in space, if one got it up there…
On Apr 13, 2020, at 6:55 PM, Chris Wilson <chris@xxxxxxxxx> wrote:
The underwater launch is obviously to cool the fins and keep the hot glue
that's holding them on from melting.
Sent from my iPhone
On Apr 13, 2020, at 6:47 PM, David P Smith (Redacted sender dave_w6dps for
DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:
There has also been some discussion of this on TRF. Of the many stupid
things on You Tube, this is far from the most dangerous.
I do not see any likelihood that we would allow any launching from glass
containers, even if they are tempered glass and filled with water.
In spite of the inconvenient lake currently in our lakebed, I really don't
see any advantage to launching from underwater.
Now, maybe if we only had a pontoon launch system and some hovercraft for
recovery...
David P Smith
ROC Board of Directors
NAR 78668, TRA 15803, L2
Amateur Extra, W6DPS
http://www.qsl.net/w6dps
On Monday, April 13, 2020, 05:20:54 PM PDT, John Jamieson
<jjamieson739@xxxxxxxxx> wrote:
Please check out this video. There are many safety issues I have with it.
Please let warped perception know it is not cool.
https://www.youtube.com/watch?v=Gy8td5cWgAw&lc=z220yxcxgti5cbgv1acdp43abkqa4urrutp1tpjtufpw03c010c.1586642972138327
--
John Jamieson
Prefect Tripoli Colorado
TRA #04920
