Author Topic: The different variants of Atlas boosters  (Read 76555 times)

Offline WallE

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Re: The different variants of Atlas boosters
« Reply #220 on: 08/17/2017 07:57 PM »
Could have but didn't. From what I understand, the main reason for not retaining the Centaur inertial guidance on the Atlas H was cost reasons, the GE radio guidance was quite a bit cheaper. The SLV-3D core lacked its own autopilot (as I mentioned, this was handled by the Centaur) so they equipped the Atlas H with surplus Atlas E/F autopilots. The actual guidance system was the same one used on refurbed E/F SLVs, which was a modification of the old Atlas D Mod III-B, and the ground portion of the guidance computer was replaced by a modernized digital system.

Online edkyle99

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Re: The different variants of Atlas boosters
« Reply #221 on: 08/17/2017 08:04 PM »
Atlas Centaur didn't fly from Vandenberg AFB at the time, so it was much easier to use the existing radio-guidance assets for Atlas H. 

 - Ed Kyle

Offline WallE

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Re: The different variants of Atlas boosters
« Reply #222 on: 08/17/2017 08:17 PM »
Atlas Centaur didn't fly from Vandenberg AFB at the time, so it was much easier to use the existing radio-guidance assets for Atlas H.

That is quite possible considering they would have had to modify the Centaur guidance system for West Coast launches and I guess nobody wanted to bother with that.

Offline RedTail48

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Re: The different variants of Atlas boosters
« Reply #223 on: 08/18/2017 08:57 AM »
See in the Topic "Original Peter Hunter Photo Collections." Follow the Dropbox link to Atlas. Follow that down to the Folder "02 Flight Database." Within that download the "02_4_by_lveh.pdf" file. As a header to each variant you will see specs for each variant including solid upper stage details...

Offline Michel Van

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Re: The different variants of Atlas boosters
« Reply #224 on: 09/29/2017 04:06 PM »
There is little know story of Atlas rocket:

Booster for Dyna Soar

Boeing wanted to use Atlas-Centaur to launch X-20 into Space
under consideration was modified Atlas E ICBM with Centaur stage and a Atlas Super E - Centaur B

Atlas E Model 850-1001 booster (for Suborbital test flight of X-20 )
modified the conical forward tank head 10 ft. diameter
also Tank stiffness, skin thickness and Tank pressures and it pressurization system change to take increase loads.
the Booster section get four fins for aerodynamic stabilization during launch

Atlas E - Centaur Model 850-2001 booster (payload 6000 to 12000 lbs)
same modification except here double amount Helium in Atlas E tanks
Booster engine upgraded of 16500 lbs to 172000 lbs thrust

Modifikation on Centaur B
Tank longer to increase propellants to 40000 lbs.
Modified tank structure and it pressurization system change to take increase loads.
RL10 engines upgraded of 15000 lbs to 2000 lbs. thrust.

Atlas Super E - Centaur B Model 850-3001 Booster
same modification like Model 850-2001 booster, but stretch tanks and more reenforced structure.
336700 lbs kerolox and 40000 lbs hydrolox
the two booster engines upgraded to (total) 500000 lbs thrust and sustainer to 57000 lbs thrust.


Source
Boeing
D2-5691 Atlas Booster Trade Studies
Dyna-Soar step-1 Phase Alpha
Contract No. AF33(500)-39831
Mach 23, 1960

Online RIB

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Re: The different variants of Atlas boosters
« Reply #225 on: 10/07/2017 10:39 AM »
Is the Atlas-Dynasoar report available downline?

Online edkyle99

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Re: The different variants of Atlas boosters
« Reply #226 on: 10/07/2017 02:11 PM »
Is the Atlas-Dynasoar report available downline?
I haven't found it online, but the Air Force Dynasoar history mentions the Atlas-Centaur proposal on page 43 of the report.  This was early in the program, during 1959 I believe.  Centaur was years from entering service at that point, and it wasn't an Air Force program, so the Air Force went with Titan.
http://www.dtic.mil/dtic/tr/fulltext/u2/a951933.pdf

"The Air Force source selection board had already appraised the
Boeing and Martin proposals. Although both contractors offered similar
delta-wing designs, they differed in their selection of boosters* While
Boeing only considered an orbital Atlas-Centaur combination, Martin officials
offered a surborbital Titan A (later renamed the Titan 1) and an orbital
Titan C. The board deemed the Boeing glider superior but also recommended
use of Martin's orbital booster. The Secretary of the Air Force, J. H.
Douglas, did not agree. Development of a new booster, capable of orbital
velocities, was clearly not in accord with Dre York's directlon. The
secretary recommended further study of the configuration and size of the
vehicle to determine whether the glider could be modified to permit
compatibility with a basic suborbital, Titan system."

 - Ed Kyle
« Last Edit: 10/07/2017 02:14 PM by edkyle99 »

Offline Michel Van

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Re: The different variants of Atlas boosters
« Reply #227 on: 10/09/2017 10:56 AM »
The D2-5691 Atlas Booster Trade Studies
Are online at Scott Lowther Patreon site https://www.patreon.com/user?u=197906
He offer Backkatalog sales and they are a bargain !

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