Author Topic: Q&A: Pegasus Designer Dr. Antonio Elias  (Read 281154 times)

Offline antonioe

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #400 on: 10/31/2007 03:16 am »

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simonbp - 30/10/2007 11:00 PM
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antonioe - 28/10/2007 7:38 AM Yes, but it's {the second stage} being developed by somebody else, so I can't talk about it until the other party agrees we can do so...
For reference, is it in the similar total impulse range as a 48B, or larger?

Patience, young Jedi, patience must you have...

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Offline vt_hokie

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #401 on: 11/01/2007 03:50 pm »
I didn't realize just how small the Orbcomm sats are!  Can you say what the approximate lifespan is on those spacecraft?

Online Skyrocket

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #402 on: 11/01/2007 04:40 pm »
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vt_hokie - 1/11/2007  6:50 PM

I didn't realize just how small the Orbcomm sats are!  Can you say what the approximate lifespan is on those spacecraft?
Design life was 4 years.

Online Skyrocket

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #403 on: 12/05/2007 04:15 pm »
The new Orbital Quarterly Newsletter shows an illustration of the Taurus II:

http://www.orbital.com/NewsInfo/Publications/OrbitalQuarterly_Fall07.pdf


Offline vt_hokie

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #404 on: 12/05/2007 04:31 pm »
That's pretty cool that it's made available online!  Thanks for the link!

Offline meiza

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #405 on: 12/05/2007 06:16 pm »
4 engines?

Offline antonioe

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #406 on: 12/05/2007 08:41 pm »
Two
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Offline Jamie Young

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #407 on: 12/05/2007 08:45 pm »
Quote
Skyrocket - 5/12/2007  11:15 AM

The new Orbital Quarterly Newsletter shows an illustration of the Taurus II:

http://www.orbital.com/NewsInfo/Publications/OrbitalQuarterly_Fall07.pdf


Link doesn't work now.

Offline Squid.erau

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #408 on: 12/05/2007 09:06 pm »
Slightly off-topic, but on page 3 of the PDF linked above is a picture of the decommissioned Navy Mk 70 booster.  It's the wider aft portion of the coyote SSST.  This is the motor they are talking about using 4 of for the abort test flights of the new MLAS system for Orion.

Matt

Online edkyle99

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #409 on: 12/05/2007 10:08 pm »
Constant diameter profile.  Looks to be about 25-30 meters to top of upper stage unit.  Upper stage only looks like it is 4-7 meters tall, which is puzzling.  Assuming that this upper stage consists of an outer shell equipped with a low-thrust N204/MMH bipropellant propulsion system to serve as a trim stage with a jettisonable solid motor "second stage" mounted within, I'm guessing that the solid motor has to be shorter than a standard Castor 120 (which was given as 2.37 x 10.7 meters for Athena), unless this drawing doesn't show the true interior length of the first stage.  The drawing could be hiding a big interstage area above the first stage propellant tanks.  

Still, since a Castor 120 would be too big and an Orion 50SXL type slightly too small, I'm guessing that the second stage motor must look something like a scaled Castor 120 ("Castor 60"?).  This would give a 200 tonne first stage, a 25-35 tonne second stage motor, and a small trim stage that probably weighs no more than 1-2 tonnes.

I could be wrong.  I probably am wrong.  I've been wrong before.  Still fun to ponder.

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Offline antonioe

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #410 on: 12/06/2007 04:33 am »
Good detective work... keep going, keep going...
ARS LONGA, VITA BREVIS...

Offline CFE

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #411 on: 12/06/2007 04:57 am »
I would guess that it's a custom-designed second stage.  I would even guess that ATK was the manufacturer (after all, who else is left to tackle a solid rocket this big?)

As a wild guess, ATK may even be using a single segment from the shuttle's SRB as the basis for the Taurus-II (still hoping to make "Cygnus" official) second stage.
"Black Zones" never stopped NASA from flying the shuttle.

Offline Jim

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #412 on: 12/06/2007 11:28 am »
Quote
Jamie Young - 5/12/2007  4:45 PM

Quote
Skyrocket - 5/12/2007  11:15 AM

The new Orbital Quarterly Newsletter shows an illustration of the Taurus II:

http://www.orbital.com/NewsInfo/Publications/OrbitalQuarterly_Fall07.pdf


Link doesn't work now.

Same for me, even when truncated to http://www.orbital.com

Online Skyrocket

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #413 on: 12/06/2007 01:14 pm »
For those, who have problems in opening the newsletter, here is a screenshot of the Taurus II

Offline Big Al

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #414 on: 12/06/2007 01:37 pm »
From the Dec 3rd issue of Avation Week, Israel is looking to develop an air launch system for small satellites, maybe you could market your whole system world wide, I bet it would be more profitable than just launching rockets.

Offline antonioe

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #415 on: 12/06/2007 02:13 pm »
"whole system"?  Could you elaborate?
ARS LONGA, VITA BREVIS...

Offline Big Al

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #416 on: 12/06/2007 03:02 pm »
Sell them the rocket design, aircraft and system technology. Let the customer build and launch his own (military) satellites

Offline Jim

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #417 on: 12/06/2007 03:04 pm »
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Big Al - 6/12/2007  11:02 AM

Sell them the rocket design, aircraft and system technology. Let the customer build and launch his own (military) satellites

Not possible.  Against many anti proliferation treaties.

Offline Jim

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #418 on: 12/06/2007 03:07 pm »
Quote
Big Al - 6/12/2007  9:37 AM

From the Dec 3rd issue of Avation Week, Israel is looking to develop an air launch system for small satellites, maybe you could market your whole system world wide, I bet it would be more profitable than just launching rockets.

Actually, no.  there is always a need to launch satellites.  There is little need to sell the means to do it

Offline A_M_Swallow

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Re: Q&A: Pegasus Designer Dr. Antonio Elias
« Reply #419 on: 12/06/2007 03:19 pm »
Quote
Skyrocket - 6/12/2007  2:14 PM

For those, who have problems in opening the newsletter, here is a screenshot of the Taurus II

The grey pipes on the side of the nozzles made it look like there was a second set behind.

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