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CX2SA > SATDIG 18.01.12 14:17l 983 Lines 31690 Bytes #999 (0) @ WW
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Today's Topics:
1. Seeking contact info for JA8TCH (Alan P. Biddle)
2. Re: Model Rocket Booster Engine for Picosatellite (Joe Leikhim)
3. Re: Seeking contact info for JA8TCH (Ted)
4. Record for # QSO in space? (Don Hoover (WS4E))
5. Re: Model Rocket Booster Engine for Picosatellite (Ken Ernandes)
6. Re: Model Rocket Booster Engine for Picosatellite
(G0MRF@xxx.xxxx (Burns Fisher)
7. Re: Model Rocket Booster Engine for Picosatellite (Bill Ress)
8. Multifunction Portable Tracker / USB Rotor Controller
(Thomas Doyle)
9. Re: Radio Pirates (Gordon JC Pearce)
10. Re: Model Rocket Booster Engine for Picosatellite (Joe Leikhim)
11. You remember KC9ROI braving the cold (Bruce)
12. Re: Seeking contact info for JA8TCH (Greg D.)
13. Re: Model Rocket Booster Engine for Picosatellite
(Gary "Joe" Mayfield)
14. Re: Model Rocket Booster Engine for Picosatellite (Joe Leikhim)
15. Re: Seeking contact info for JA8TCH (Alan P. Biddle)
----------------------------------------------------------------------
Message: 1
Date: Tue, 17 Jan 2012 14:29:55 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>, "SAREX-BB" <SAREX@xxxxx.xxx>
Subject: [amsat-bb] Seeking contact info for JA8TCH
Message-ID: <56FDDDD0C44A4DDEA4FA184F76DCE2D2@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Hi,
I am looking for information, particularly an email address, for JA8TCH.
He(?) was one of the last to receive telemetry from ARISSat-1.
Unfortunately there is no listing in English sources such as QRZ.COM, though
I got several hits from Japanese language sites, including an Echolink node.
Alan
WA4SCA
------------------------------
Message: 2
Date: Tue, 17 Jan 2012 15:44:16 -0500
From: Joe Leikhim <rhyolite@xxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
Message-ID: <4F15DDA0.9040505@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
David;
There are some much bigger motors! Ask the Level-3 rocketry folks!
Anyway a cluster of medium sized motors could be fired individually as
required to raise altitude. I would think that SRB's would be more
reliable and safer than hypergolic used on previous Oscars. There would
of course be a lot of heat in the rocket casings that would need to be
dissipated.
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
www.Leikhim.com
JLeikhim@xxxxxxx.xxx
407-982-0446
Note to GMail Account users. Due to an abnormally high volume of spam
originating from bogus GMail accounts, I have found it necessary to block
certain GMail traffic. Please phone me if you believe your message was not
received.
------------------------------
Message: 3
Date: Tue, 17 Jan 2012 13:13:40 -0800
From: "Ted" <k7trkradio@xxxxxxx.xxx>
To: <APBIDDLE@xxxxxxx.xxx>, "'AMSAT-BB'" <amsat-bb@xxxxx.xxx>,
"'SAREX-BB'" <SAREX@xxxxx.xxx>
Subject: [amsat-bb] Re: Seeking contact info for JA8TCH
Message-ID: <672DC94401CE42D5A1B46DA957539C79@xxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Alan, maybe the JARL has his info. (Japans equivalent of our ARRL)
73, Ted K7TRK
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Alan P. Biddle
Sent: Tuesday, January 17, 2012 12:30 PM
To: AMSAT-BB; SAREX-BB
Subject: [amsat-bb] Seeking contact info for JA8TCH
Hi,
I am looking for information, particularly an email address, for JA8TCH.
He(?) was one of the last to receive telemetry from ARISSat-1.
Unfortunately there is no listing in English sources such as QRZ.COM, though
I got several hits from Japanese language sites, including an Echolink node.
Alan
WA4SCA
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 4
Date: Tue, 17 Jan 2012 16:22:04 -0500
From: "Don Hoover (WS4E)" <ws4e@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Record for # QSO in space?
Message-ID:
<CABnqzh_XeB71+SRVpSvMnWGOCTY7WZf720GOHpqFwt5TbN9Zjg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Anyone know who has the record for the most ham QSO's in space?
Astronaut Doug Wheelock maybe?
Just curious. It would be a nice record to have some other people try
to break and incentive to keep the activity going.
------------------------------
Message: 5
Date: Tue, 17 Jan 2012 16:22:23 -0500
From: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
To: "rhyolite@xxxxxxxx.xxxx <rhyolite@xxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
Message-ID: <29C8A835-92C1-40B8-8E80-23C99E0A8E64@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
How would attitude be controlled so the thrust is in the correct direction?
Spin stabilization about the maximum moment off inertia axis is probably the
best choice. This would require a magnetic torquing system.
Another issue is the thrust needs to be directed through the spacecraft's
center-of-mass or there will be stability problems. How would a cluster be
fired individually with each, in turn, directed through the center of mass?
That's a complex design problem.
One more issue is that when you carry multiple motors, the first must
accelerate the mass of the unfired motors, so the early firing will be less
effective. The mass of the spent casings will need to be accelerated buy
the subsequent motor firings.
You do have some work to do before you have a practical solution.
73, Ken N2WWD
Sent from my iPad
On Jan 17, 2012, at 3:44 PM, Joe Leikhim <rhyolite@xxxxxxxx.xxx> wrote:
> David;
> There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway
a cluster of medium sized motors could be fired individually as required to
raise altitude. I would think that SRB's would be more reliable and safer
than hypergolic used on previous Oscars. There would of course be a lot of
heat in the rocket casings that would need to be dissipated.
>
> --
> Joe Leikhim
>
> Leikhim and Associates
> Communications Consultants
> Oviedo, Florida
>
> www.Leikhim.com
>
> JLeikhim@xxxxxxx.xxx
>
> 407-982-0446
>
> Note to GMail Account users. Due to an abnormally high volume of spam
originating from bogus GMail accounts, I have found it necessary to block
certain GMail traffic. Please phone me if you believe your message was not
received.
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 6
Date: Tue, 17 Jan 2012 16:33:43 -0500
From: Burns Fisher <burns@xxxxxx.xx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
(G0MRF@xxx.xxxx
Message-ID:
<CABX7KxU6KN4k9LkFXjiHLJ_NbO-0MbROnNVzVVjPe8efUROc+g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Pretty cool idea! Of course Aerotech sells much larger engines with
hundreds of newton-seconds of total impulse, and somewhere close to 100
pounds of instantaneous thrust when it is first lit! And even if it stays
in LEO, this certainly prolongs its life...
What I wonder about is how the 3-axis stabilization on this bird works...I
don't see any additional nozzles in the picture and if they use a momentum
wheel, they have to unload it at some point. I suppose you could spin it
instead of active stabilization, but then you can only use one engine (on
the spin axis). As someone commented earlier in another thread, you need
two firings to go from one circular orbit to another one at a different
altitude.
Thanks for posting!
Burns
> Thanks Joe.
>
> What an exciting concept.
>
> Having got really enthusiastic, I thought I would roughly calculate how
> high one of these little rockets could raise the orbit.
>
> Given that one rocket reload pack has
>
> 40 Newtons of thrust
> and lasts for about one second
> We have 40 Newton seconds of specific impulse.
>
>
> The mass flow rate is 18.6g in one second or 0.0168kg/s
>
> So.....the ISP (a bit vague here) is around 219 seconds (ave thrust / mass
> flow rate / 9.81ms^2)
>
> Which should get a 3.7kg satellite's apogee about..... 40km higher.
>
> So...Not enough for P3E then
>
> Oh well, not so exciting after all. Time for a beer.
>
> 73 David G0MRF
>
>
>
>
> In a message dated 17/01/2012 03:56:37 GMT Standard Time,
> rhyolite@xxxxxxxx.xxx writes:
>
> Has anyone seen this. I am surprised a shuttle mission permitted this
> type of booster. From what I believed, safety concerns prevented most
> types of boosters.
>
> http://www.rocketryplanet.com/content/view/3706/30/#axzz1jgQ85qx1
>
> --
> Joe Leikhim
>
> Leikhim and Associates
> Communications Consultants
> Oviedo, Florida
>
> www.Leikhim.com <http://www.leikhim.com/>
>
> JLeikhim@xxxxxxx.xxx
>
> 407-982-0446
>
> Note to GMail Account users. Due to an abnormally high volume of spam
> originating from bogus GMail accounts, I have found it necessary to block
> certain GMail traffic. Please phone me if you believe your message was not
> received.
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> http://amsat.org/mailman/listinfo/amsat-bb
>
>
> End of AMSAT-BB Digest, Vol 7, Issue 30
> ***************************************
>
------------------------------
Message: 7
Date: Tue, 17 Jan 2012 13:48:26 -0800
From: Bill Ress <bill@xxxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
Message-ID: <4F15ECAA.6090201@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Aah but David, its a start along the lines you and I have been trying to
drum up interest. You gotta crawl before you walk. As you know well,
it's the way to start out in LEO (cheaper launch) and then nudge it into
MEO. I said before, it's gonna happen since it's the obvious solution to
getting to a better orbit. A lot to overcome but there's work going on
now to get there.
Did someone say that the new Delfi satellite will have some thrust on
board or was it a wishful dream on my part??
Regards...Bill - N6GHz
On 1/17/2012 11:42 AM, G0MRF@xxx.xxx wrote:
> Thanks Joe.
>
> What an exciting concept.
>
> Having got really enthusiastic, I thought I would roughly calculate how
> high one of these little rockets could raise the orbit.
>
> Given that one rocket reload pack has
>
> 40 Newtons of thrust
> and lasts for about one second
> We have 40 Newton seconds of specific impulse.
>
>
> The mass flow rate is 18.6g in one second or 0.0168kg/s
>
> So.....the ISP (a bit vague here) is around 219 seconds (ave thrust / mass
> flow rate / 9.81ms^2)
>
> Which should get a 3.7kg satellite's apogee about..... 40km higher.
>
> So...Not enough for P3E then
>
> Oh well, not so exciting after all. Time for a beer.
>
> 73 David G0MRF
>
>
>
>
> In a message dated 17/01/2012 03:56:37 GMT Standard Time,
> rhyolite@xxxxxxxx.xxx writes:
>
> Has anyone seen this. I am surprised a shuttle mission permitted this
> type of booster. From what I believed, safety concerns prevented most
> types of boosters.
>
> http://www.rocketryplanet.com/content/view/3706/30/#axzz1jgQ85qx1
>
> --
> Joe Leikhim
>
> Leikhim and Associates
> Communications Consultants
> Oviedo, Florida
>
> www.Leikhim.com
>
> JLeikhim@xxxxxxx.xxx
>
> 407-982-0446
>
> Note to GMail Account users. Due to an abnormally high volume of spam
> originating from bogus GMail accounts, I have found it necessary to block
> certain GMail traffic. Please phone me if you believe your message was not
> received.
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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@xxxxx.xxx. 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
>
>
--
Regards...Bill Ress
High Sierra Microwave
------------------------------
Message: 8
Date: Tue, 17 Jan 2012 16:59:33 -0600
From: Thomas Doyle <tomdoyle1948@xxxxx.xxx>
To: AMSAT-BB@xxxxx.xxx
Subject: [amsat-bb] Multifunction Portable Tracker / USB Rotor
Controller
Message-ID:
<CAHnRQR+hP0szKExd7JB94-PARAAfw_Rm+9X1FyVSB6bVsHVxJw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
You might find this interesting.
http://www.tomdoyle.org/SimpleSatTracker
Sent from my computer.
73 W9KE tom ...
------------------------------
Message: 9
Date: Tue, 17 Jan 2012 23:16:27 +0000
From: Gordon JC Pearce <gordonjcp@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Radio Pirates
Message-ID: <4F16014B.2000200@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 17/01/12 03:42, Gregg Wonderly wrote:
> The biggest issue that causes recession and then depression in the
> economy, is when the value in the economy out strips the cash available
> to support that value. When everyone buys the "cheapest" item, and it is
> a defective item, that then doesn't live long enough in the economy,
> that can cause people to replace it, in an emergency purchase, with a
> "credit purchase", which then presses the economy with more value, and
> less cash.
Right, but my point is that the "cheap crap" item is lasting longer than
the expensive name-brand item, and comes with full service documentation
and a sane method of ordering spares. Furthermore, in many cases the
manufacturers have helpful and knowledgeable techies, even if there is a
bit of a language barrier.
I don't really see why I should pay extra for a product that's not as
good, from a company that treats its customers and indeed its dealers
with what stops just barely short of contempt once it's got their money.
--
Gordonjcp MM0YEQ
------------------------------
Message: 10
Date: Tue, 17 Jan 2012 18:33:12 -0500
From: Joe Leikhim <rhyolite@xxxxxxxx.xxx>
To: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
Message-ID: <4F160538.4000501@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have developed the perfect solution;
A gatling gun type canister for the rocket motors would solve all of
your objections per below:
On 1/17/2012 4:22 PM, Ken Ernandes wrote:
> How would attitude be controlled so the thrust is in the correct
direction? Spin stabilization about the maximum moment off inertia axis is
probably the best choice. This would require a magnetic torquing system.
Yes just like other missions.
> Another issue is the thrust needs to be directed through the spacecraft's
center-of-mass or there will be stability problems. How would a cluster be
fired individually with each, in turn, directed through the center of mass?
That's a complex design problem.
A motorized canister with 6 to 8 motors aligned such that the active
motor is aligned through the COM. Picture a revolver or gatling gun.
> One more issue is that when you carry multiple motors, the first must
accelerate the mass of the unfired motors, so the early firing will be less
effective. The mass of the spent casings will need to be accelerated buy
the subsequent motor firings.
Spent casings would be ejected using the ejection charge normally used
for deploying a parachute. Just as with any fuel, the mass of the
unfired fuel will create mass for the initial firings.
> You do have some work to do before you have a practical solution.
Work is done. Took about 4 minutes. Coffee break now!
> 73, Ken N2WWD
>
> Sent from my iPad
>
>
>
> On Jan 17, 2012, at 3:44 PM, Joe Leikhim<rhyolite@xxxxxxxx.xxx> wrote:
>
>> David;
>> There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway
a cluster of medium sized motors could be fired individually as required to
raise altitude. I would think that SRB's would be more reliable and safer
than hypergolic used on previous Oscars. There would of course be a lot of
heat in the rocket casings that would need to be dissipated.
>>
>> --
>> Joe Leikhim
>>
>> Leikhim and Associates
>> Communications Consultants
>> Oviedo, Florida
>>
>> www.Leikhim.com
>>
>> JLeikhim@xxxxxxx.xxx
>>
>> 407-982-0446
>>
>> Note to GMail Account users. Due to an abnormally high volume of spam
originating from bogus GMail accounts, I have found it necessary to block
certain GMail traffic. Please phone me if you believe your message was not
received.
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. 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
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
www.Leikhim.com
JLeikhim@xxxxxxx.xxx
407-982-0446
Note to GMail Account users. Due to an abnormally high volume of spam
originating from bogus GMail accounts, I have found it necessary to block
certain GMail traffic. Please phone me if you believe your message was not
received.
------------------------------
Message: 11
Date: Tue, 17 Jan 2012 19:26:43 -0600
From: Bruce <kk5do@xxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] You remember KC9ROI braving the cold
Message-ID: <4F161FD3.9010004@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
If you remember a few weeks ago KC9ROI braving the cold to work ARISSat-1.
I thought that was pretty neat and I had to get a Satellite
Communicators Club Certificate to him and what better way than at one of
their club meetings. I sent the certificate out the next day for a
meeting they had Saturday, Jan 14. They framed the certificate and
presented it to him. Here is a picture on their website.
http://www.n9xh.org/
You never know where that spark of enthusiasm is, this might just be it.
73...bruce
--
Bruce Paige, KK5DO
AMSAT Director Contests and Awards
ARRL Awards Manager (WAS, 5BWAS, VUCC), VE
Houston AMSAT Net - Wed 0200z on Echolink - Conference *AMSAT*
Also live streaming MP3 at http://www.amsatnet.com
Podcast at http://www.amsatnet.com/podcast.xml or iTunes
Latest satellite news on the ARRL Audio News
http://www.arrl.org
AMSAT on Twitter http://www.twitter.com/amsat
------------------------------
Message: 12
Date: Tue, 17 Jan 2012 19:38:03 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
To: <apbiddle@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>, <sarex@xxxxx.xxx>
Subject: [amsat-bb] Re: Seeking contact info for JA8TCH
Message-ID: <BLU133-W91695A442DA940A8DDCFAA9810@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Alan,
I found the following listing in a 1982 "Foreign Listings Callbook": (I
knew I saved this for a reason...)
JA8TCH Mori Seigi, 81-75 Taihei, Shinoro, Kitaku, Sapporo, Hkd 001
Now, that was from 30 years ago... presuming the call hasn't been
re-issued, maybe a starting place?
Good luck, and congrats to Seigi-san!
Greg KO6TH
> From: APBIDDLE@xxxxxx.xxx
> To: amsat-bb@xxxxx.xxxx SAREX@xxxxx.xxx
> Date: Tue, 17 Jan 2012 14:29:55 -0600
> Subject: [amsat-bb] Seeking contact info for JA8TCH
>
> Hi,
>
> I am looking for information, particularly an email address, for JA8TCH.
> He(?) was one of the last to receive telemetry from ARISSat-1.
> Unfortunately there is no listing in English sources such as QRZ.COM, though
> I got several hits from Japanese language sites, including an Echolink node.
>
> Alan
> WA4SCA
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
------------------------------
Message: 13
Date: Tue, 17 Jan 2012 22:04:11 -0600
From: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
To: <rhyolite@xxxxxxxx.xxx>, "'Ken Ernandes'" <n2wwd@xxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
Message-ID: <BAY169-DS41661D0DA36A40F9A521968A810@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
This is a fun thought exercise. The gatling gun is one option. I prefer
something with no moving parts. It should be possible (not easy) to center
one engine on each side. That would be six engines. Once in orbit take the
time to stabilize the satellite along the first axis before firing the first
engine to boost the orbit. Repeat the process up to 5 times. Wow - This is
rocket science!
73,
Joe kk0sd
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Joe Leikhim
Sent: Tuesday, January 17, 2012 5:33 PM
To: Ken Ernandes
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
I have developed the perfect solution;
A gatling gun type canister for the rocket motors would solve all of
your objections per below:
On 1/17/2012 4:22 PM, Ken Ernandes wrote:
> How would attitude be controlled so the thrust is in the correct
direction? Spin stabilization about the maximum moment off inertia axis is
probably the best choice. This would require a magnetic torquing system.
Yes just like other missions.
> Another issue is the thrust needs to be directed through the spacecraft's
center-of-mass or there will be stability problems. How would a cluster be
fired individually with each, in turn, directed through the center of mass?
That's a complex design problem.
A motorized canister with 6 to 8 motors aligned such that the active
motor is aligned through the COM. Picture a revolver or gatling gun.
> One more issue is that when you carry multiple motors, the first must
accelerate the mass of the unfired motors, so the early firing will be less
effective. The mass of the spent casings will need to be accelerated buy
the subsequent motor firings.
Spent casings would be ejected using the ejection charge normally used
for deploying a parachute. Just as with any fuel, the mass of the
unfired fuel will create mass for the initial firings.
> You do have some work to do before you have a practical solution.
Work is done. Took about 4 minutes. Coffee break now!
> 73, Ken N2WWD
>
> Sent from my iPad
>
>
>
> On Jan 17, 2012, at 3:44 PM, Joe Leikhim<rhyolite@xxxxxxxx.xxx> wrote:
>
>> David;
>> There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway
a cluster of medium sized motors could be fired individually as required to
raise altitude. I would think that SRB's would be more reliable and safer
than hypergolic used on previous Oscars. There would of course be a lot of
heat in the rocket casings that would need to be dissipated.
>>
>> --
>> Joe Leikhim
>>
>> Leikhim and Associates
>> Communications Consultants
>> Oviedo, Florida
>>
>> www.Leikhim.com
>>
>> JLeikhim@xxxxxxx.xxx
>>
>> 407-982-0446
>>
>> Note to GMail Account users. Due to an abnormally high volume of spam
originating from bogus GMail accounts, I have found it necessary to block
certain GMail traffic. Please phone me if you believe your message was not
received.
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. 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
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
www.Leikhim.com
JLeikhim@xxxxxxx.xxx
407-982-0446
Note to GMail Account users. Due to an abnormally high volume of spam
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Message: 14
Date: Wed, 18 Jan 2012 00:16:38 -0500
From: Joe Leikhim <rhyolite@xxxxxxxx.xxx>
To: "Gary \"Joe\" Mayfield" <gary_mayfield@xxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
Message-ID: <4F1655B6.6030708@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Like any design a cost-benefit analysis would be required to determine
if the Gatling arrangement is even necessary. I am sure there are about
a dozen ways to "skin the cat". (My apologies to my pet cat Mac)
On 1/17/2012 11:04 PM, Gary "Joe" Mayfield wrote:
> This is a fun thought exercise. The gatling gun is one option. I prefer
> something with no moving parts. It should be possible (not easy) to center
> one engine on each side. That would be six engines. Once in orbit take the
> time to stabilize the satellite along the first axis before firing the first
> engine to boost the orbit. Repeat the process up to 5 times. Wow - This is
> rocket science!
>
> 73,
> Joe kk0sd
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Joe Leikhim
> Sent: Tuesday, January 17, 2012 5:33 PM
> To: Ken Ernandes
> Cc: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite
>
> I have developed the perfect solution;
>
> A gatling gun type canister for the rocket motors would solve all of
> your objections per below:
>
> On 1/17/2012 4:22 PM, Ken Ernandes wrote:
>> How would attitude be controlled so the thrust is in the correct
> direction? Spin stabilization about the maximum moment off inertia axis is
> probably the best choice. This would require a magnetic torquing system.
>
> Yes just like other missions.
>> Another issue is the thrust needs to be directed through the spacecraft's
> center-of-mass or there will be stability problems. How would a cluster be
> fired individually with each, in turn, directed through the center of mass?
> That's a complex design problem.
>
> A motorized canister with 6 to 8 motors aligned such that the active
> motor is aligned through the COM. Picture a revolver or gatling gun.
>> One more issue is that when you carry multiple motors, the first must
> accelerate the mass of the unfired motors, so the early firing will be less
> effective. The mass of the spent casings will need to be accelerated buy
> the subsequent motor firings.
>
> Spent casings would be ejected using the ejection charge normally used
> for deploying a parachute. Just as with any fuel, the mass of the
> unfired fuel will create mass for the initial firings.
>> You do have some work to do before you have a practical solution.
> Work is done. Took about 4 minutes. Coffee break now!
>> 73, Ken N2WWD
>>
>> Sent from my iPad
>>
>>
>>
>> On Jan 17, 2012, at 3:44 PM, Joe Leikhim<rhyolite@xxxxxxxx.xxx> wrote:
>>
>>> David;
>>> There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway
> a cluster of medium sized motors could be fired individually as required to
> raise altitude. I would think that SRB's would be more reliable and safer
> than hypergolic used on previous Oscars. There would of course be a lot of
> heat in the rocket casings that would need to be dissipated.
>>> --
>>> Joe Leikhim
>>>
>>> Leikhim and Associates
>>> Communications Consultants
>>> Oviedo, Florida
>>>
>>> www.Leikhim.com
>>>
>>> JLeikhim@xxxxxxx.xxx
>>>
>>> 407-982-0446
>>>
>>> Note to GMail Account users. Due to an abnormally high volume of spam
> originating from bogus GMail accounts, I have found it necessary to block
> certain GMail traffic. Please phone me if you believe your message was not
> received.
>>> _______________________________________________
>>> Sent via AMSAT-BB@xxxxx.xxx. 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
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
www.Leikhim.com
JLeikhim@xxxxxxx.xxx
407-982-0446
Note to GMail Account users. Due to an abnormally high volume of spam
originating from bogus GMail accounts, I have found it necessary to block
certain GMail traffic. Please phone me if you believe your message was not
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Message: 15
Date: Wed, 18 Jan 2012 07:05:36 -0600
From: "Alan P. Biddle" <APBIDDLE@xxxxxx.xxx>
To: "'Greg D.'" <ko6th_greg@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Seeking contact info for JA8TCH
Message-ID: <8011C4767D76437BBF579B01C40CED1E@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Greg,
Wow, and I thought I was a packrat! Many thanks. It will give me a few
more places to look.
73s,
Alan
WA4SCA
-----Original Message-----
From: Greg D. [mailto:ko6th_greg@xxxxxxx.xxxx
Sent: Tuesday, January 17, 2012 9:38 PM
To: apbiddle@xxxxxxx.xxxx amsat-bb@xxxxx.xxxx sarex@xxxxx.xxx
Subject: RE: [amsat-bb] Seeking contact info for JA8TCH
Hi Alan,
I found the following listing in a 1982 "Foreign Listings Callbook": (I
knew I saved this for a reason...)
JA8TCH Mori Seigi, 81-75 Taihei, Shinoro, Kitaku, Sapporo, Hkd 001
Now, that was from 30 years ago... presuming the call hasn't been
re-issued, maybe a starting place?
Good luck, and congrats to Seigi-san!
Greg KO6TH
> From: APBIDDLE@xxxxxx.xxx
> To: amsat-bb@xxxxx.xxxx SAREX@xxxxx.xxx
> Date: Tue, 17 Jan 2012 14:29:55 -0600
> Subject: [amsat-bb] Seeking contact info for JA8TCH
>
> Hi,
>
> I am looking for information, particularly an email address, for JA8TCH.
> He(?) was one of the last to receive telemetry from ARISSat-1.
> Unfortunately there is no listing in English sources such as QRZ.COM,
though
> I got several hits from Japanese language sites, including an Echolink
node.
>
> Alan
> WA4SCA
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. 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
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End of AMSAT-BB Digest, Vol 7, Issue 31
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