Those must have been exciting times!
73, Jim KQ6EA
On 09/29/2013 03:27 PM, Robert McGwier wrote:
Ah yes and how many knew Martin Sweeting was involved in early design
meetings for P3A? Sorry for leaving you out Sir Martin!
On Sun, Sep 29, 2013 at 11:14 AM, Robert McGwier <rwmcgw...@gmail.com>wrote:
From one of the great minds of our history. Marty showed us how good the
kinds of writing he did would be for us......
The first photo is one of the first formal meetings where Karl, Jan,
Marty Davidoff, Tom Clark and others discuss Phase 3A. These were GLORIOUS
years for AMSAT. No one denies this and no amount of back biting or rehash
of old incidents will fix it. The tools they had were their brains, a
pencil, and SOME calculation engine. The tools we have today allow many
more to play. The achievements that Karl's GENIUS, Jan's system
engineering and the technical input and guidance from the rest gave
(including Marty) are unsung and poorly told songs of the indomitable
spirit of these free spirited thinkers...
http://n4hy.smugmug.com/AMSAT/Phase-3-A/001-Meetings-01-Technical/2053450_WkWbc9#!i=105550031&k=L7jf7FJ
And this one even earlier (that's Rich Zwirko, K1HTV in coat and tie).
If others can identify people (not including Tom, Marty, Karl, and Jan and
Rich) please let me know who they are.
http://n4hy.smugmug.com/AMSAT/Phase-3-A/001-Meetings-01-Technical/2053450_WkWbc9#!i=105550132&k=PqJ99cK
I almost could wish I was 15 years older or had a time machine.....
Bob
N4HY
On Mon, Sep 23, 2013 at 6:35 PM, Paul Stoetzer <n...@arrl.net> wrote:
I recently obtained a copy of the 1990 edition of Martin Davidoff's
Satellite Experimenters' Handbook and as I was browsing through the book,
I
came across a passage on page 4-9 about the difficulties with UO-11,
that's
very relevant to the ongoing debate about the lack of Phase 3 satellites:
"If there's a message here, it's that taking part in the amateur satellite
program is not for the faint-hearted. Setbacks and barriers will always be
part of the picture. And, the most rewarding successes will probably come
from employing ingenuity and tenacity to overcome the 'impossible'
hurdles."
73,
Paul Stoetzer, N8HM
Washington, DC (FM18lv)
On Sun, Sep 22, 2013 at 7:17 PM, <mlengrues...@aol.com> wrote:
Hi Dan,
OSCAR-10 (P3-B) used the same 400N engine as OSCAR-13 (P3-C) and
OSCAR-40 (P3-D).
For P3-E we have a 200N motor from EADS Astrium, the same one which is
used on the European ATV...
I was AMSAT P3-A (planned to be OSCAR-9) which used a solid propellant
apogee kick-motor.
It's under the water near the cost of french Guiana.. RIP
You can find an very good article here:
http://www.ka9q.net/AMSAT-Tech-Journal-2.pdf
See page 8..15
Rest assured, the PFA and propulsion system was qualified according to
highest commercial standards by commercial companies. Thus in no way
there would be any risk to the launcher or other payloads. This also
includes several levels of safety borders in the hardware design and in
the software. The launch agencies have there own specialized personal
to review all the details... Without that, nobody would have
launched
any of the P3 satellites !!!
What happened to AO-40 later on after orbit injection and after
activating the systems is a completely different matter and did not
present any risk to the launcher at any time!
Michael R. Lengruesser, DD5ER
AMSAT-DL e.V.
-- International Satellites for Communication,
Science and Education --
mlengrues...@amsat-dl.org
http://www.amsat-dl.org
In einer eMail vom 22.09.2013 21:07:08 Westeuropäische Sommerzeit
schreibt
n8...@usa.net:
The apogee motors for OSCAR-10,and OSCAR-13 were solid propellant
400 Newton trust motors donated to AMSAT-DL by the Messerschmitt
Aerospace
Company in Germany.
Only Phase 3A had a solid fuel motor. AO-10 and AO-13 had liquid fuel
bi-propellent motors the same as AO-40. No matter how well designed
they
are,
they still have the potential to blow up the entire launch stack if
something
goes wrong. Since Dick Daniels is no longer with us, the knowledge has
been
lost and we will not be launching any more of these in the future.
Dan Schultz N8FGV
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--
Bob McGwier
Owner and Technical Director, Allied Communication, LLC
Professor Virginia Tech
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
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