I met Bob Truax a bunch of years ago. Look up the Sea Dragon and Sealar
plus some of the test rockets he built. Yes big rockets can be launched
from water too. (and yeah he was the Evel Knievel 'sky cycle' guy too)
Kramer
On 4/15/2020 6:16 PM, Jason Muckenthaler (Redacted sender jmuck78 for
DMARC) wrote:
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:
My father and I did an underwater launch at NARAM-14 in Seattle WA in 1972. The water container was clear plastic. It was considered okay then, at least. - jeff
On Wed, Apr 15, 2020 at 5:43 PM Bryan Langholz <langholz@xxxxxxx <mailto: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
<mailto: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
<mailto: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 <mailto: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
<https://urldefense.com/v3/__https://www.youtube.com/watch?v=Gy8td5cWgAw&lc=z220yxcxgti5cbgv1acdp43abkqa4urrutp1tpjtufpw03c010c.1586642972138327__;!!LIr3w8kk_Xxm!86Exn_kdtOmpHN_YScPZyg7waxsHpfnRxVJre7UOeZJ4f2YO1f-rDTi2rvy8Lq9d$>
-- John Jamieson
Prefect Tripoli Colorado
TRA #04920
--
Jeff Stai ~ WK6I ~ wk6i.jeff@xxxxxxxxx <mailto:wk6i.jeff@xxxxxxxxx>
RTTY op at W7RN
Twisted Oak Winery ~ http://www.twistedoak.com/
