[amsat-bb] Re: Phase 3

Peter Guelzow peter.guelzow at kourou.de
Sun Sep 22 04:33:17 PDT 2013

Hi Domenico, et all,

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:
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!

73s Peter DB2OS

On 22.09.2013 12:29, i8cvs wrote:
> ----- Original Message -----
> From: "pabutusa at gmail.com" <rob at pabut.org>
> To: "i8cvs" <domenico.i8cvs at tin.it>
> Sent: Sunday, September 22, 2013 5:01 AM
> Subject: Re: [amsat-bb] Re: Phase 3
> Are you sure the kick motors on ao10/13 were solid ???? I was pretty sure
> the were liquid because the could be fired multiple times to tweak the
> orbit. I also remember seeing pictures of technicians I'm hazmat suits
> fueling the bird.
> --> Rob, ka2pbt
> Hi Rob,KA2PBT
> The solid propellant motor of OSCAR-10 was designed to fire
> only one time at the apogee and change the orbit inclination to
> around 67 degrees into a Molniya orbit but unfortunately the
> onboard 400 Newton kick motor  did not function entirely
> correctly, due to collision with launch vehicle after separation
> - hence the not-quite-Molniya-orbit with only inclination of
> 27 degrees.
> OSCAR-13 uses a bi-propellant hydrazine and nitrous oxide
> 400 Newton motor system and behaved flawlessly during the
> two post launch burns.
> Oscar-13 was launched into a highly elliptical equatorial orbit,
> a "Geostationary Transfer Orbit", with a perigee height of
> 240 km. Over the next 7 days it was re-oriented to point the motor
> along-track such that apogee velocity could be increased by
> 150 m/s. This increased perigee height to 1100 km, and freed
> the satellite from buffeting and atmospheric drag.
> During the next 2 weeks it was oriented "upwards" so that a burn
> at apogee would increase inclination to 58°, and perigee height to
> 2500 km.
> Two weeks later, 1988 July 22 15:00 utc the mode-B transponder
> was switched on for general use.
> The pictures you have seen referes to charge the fluid bi-propellant
> hydrazine and nitrous oxide toxic fuel into OSCAR-13 and later
> on to charge the liquid propellant into AO40 made with UMDH
> and nitrogen tetroxide.
> 73" de
> i8CVS Domenico
> On Sep 21, 2013, at 22:15, "i8cvs" <domenico.i8cvs at tin.it> wrote:
>> ----- Original Message -----
>> From: "Angus McLeod" <amcleod at caribsurf.com>
>> To: <amsat-bb at amsat.org>
>> Sent: Saturday, September 21, 2013 9:27 PM
>> Subject: [amsat-bb] Re: Phase 3
>>> As far as I know, the kick-motors used on the Phase-3 birds were NOT
>>> cardboard tubes packed with homemade gunpowder.  They were commercial
>>> grade motors obtained from the commercial aerospace industry.  If I am
>>> wrong about this, and someone can jump in with facts, I'd be glad to
>>> hear.
>> Hi Angus,
>> The kitch 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.
>> The kick apogee motor for AO40 was a liquid propellant made with UMDH and
>> nitrogen tetroxide but it failed to work because unfortunately someone
>> before the flight forgot to remove the safety red cover over the exost
>> valve of the fuel system and this is why after many attemps to overcome
>> the problem the satellite got an explosion inside wich damaged most part
>> of transponders.BTW AO40 worked fantastic in Mode U/S ,Mode L/S
>> and Mode L/K for a long time until the main battery and the spare battery
>> system suddently failed in short circuit.
>> 73" de i8CVS Domenico
>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list