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Author Topic: Dream Chaser for CEV requirement  (Read 36155 times)

Offline Grey Havoc

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Re: Dream Chaser for CEV requirement
« Reply #15 on: August 30, 2010, 06:12:12 am »
Probably the only place to get "off the shelf" shuttle avionics would be museums and eBay. Probably best to buy stuff actually manufactured in this century.

But didn't NASA carry out a shuttle avionics modernisation programme not too long ago?
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Offline Matej

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Re: Dream Chaser for CEV requirement
« Reply #16 on: August 30, 2010, 08:12:52 am »
...too long ago...

Besides, there are a lot of new modern systems, developed during the X-33 and CEV programs that are ready to use. But the key point is to integrate them, to put the specific configuration together and to create a solid software that can operate them.

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Offline Byeman

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Re: Dream Chaser for CEV requirement
« Reply #17 on: August 30, 2010, 08:49:44 am »
Probably the only place to get "off the shelf" shuttle avionics would be museums and eBay. Probably best to buy stuff actually manufactured in this century.

But didn't NASA carry out a shuttle avionics modernisation programme not too long ago?

That was only the cockpit instruments and displays.  MEDS was the name of the project and it used COTS flat panel displays. 

The shuttle avionics is mid 70's technology, but the GPC's were upgraded to what the B-1B used and that was early 80's technology. 

Offline Grey Havoc

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Re: Dream Chaser for CEV requirement
« Reply #18 on: August 30, 2010, 10:58:51 am »
That was only the cockpit instruments and displays.  MEDS was the name of the project and it used COTS flat panel displays.  

The shuttle avionics is mid 70's technology, but the GPC's were upgraded to what the B-1B used and that was early 80's technology.  

I remember the cockpit interfaces side of things (being a major COTS disbeliever  :) ) but I thought they also did some work on the three CPUs and some other elements?
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Offline Byeman

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Re: Dream Chaser for CEV requirement
« Reply #19 on: August 31, 2010, 04:45:57 am »
That was only the cockpit instruments and displays.  MEDS was the name of the project and it used COTS flat panel displays.  

The shuttle avionics is mid 70's technology, but the GPC's were upgraded to what the B-1B used and that was early 80's technology.  

I remember the cockpit interfaces side of things (being a major COTS disbeliever  :) ) but I thought they also did some work on the three CPUs and some other elements?

There are 5 GPC's (general purpose computers)

Most guidance systems are "COTS".  OSC has developed a system "MACH", that is used in all of its vehicles.

Offline Grey Havoc

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Re: Dream Chaser for CEV requirement
« Reply #20 on: August 31, 2010, 04:53:14 am »
There are 5 GPC's (general purpose computers)

Most guidance systems are "COTS".  OSC has developed a system "MACH", that is used in all of its vehicles.

I thought most current space certified guidance systems were still custom built? As for the GPCs, I thought they had recently gone to a system of three primary CPUs (GPCs), but you're right, it's still four.
« Last Edit: August 31, 2010, 04:59:23 am by Grey Havoc »
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Offline Byeman

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Re: Dream Chaser for CEV requirement
« Reply #21 on: August 31, 2010, 06:23:59 am »
There are 5 GPC's (general purpose computers)

Most guidance systems are "COTS".  OSC has developed a system "MACH", that is used in all of its vehicles.

I thought most current space certified guidance systems were still custom built? As for the GPCs, I thought they had recently gone to a system of three primary CPUs (GPCs), but you're right, it's still four.

No, it is 5 (five) GPC's

There is a difference between launch vehicle guidance systems and spacecraft guidance systems

At any rate, gyros, accels, computers, data systems are all available COTS

Offline FutureSpaceTourist

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Re: Dream Chaser for CEV requirement
« Reply #22 on: October 21, 2010, 01:09:00 pm »
The Sierra Nevada Corporation has issued a statement about progress on DreamChaser under their NASA CCDev contract. The start of the statement is below:

Quote from: http://www.sncorp.com/news/press/pr10/snc_ccdev_milestone.shtml
Sierra Nevada Space Systems Successfully Competes Two
Major Nasa Human Space Flight Development Milestones

SNC fires hybrid rocket motor and begins production on Dream Chaser Vehicle


Louisville, CO – October 11, 2010  – The Sierra Nevada Corporation (SNC) Space Systems Group announces the successful completion of two critical milestones for NASA’s Commercial Crew Development (CCDev) Program.  On September 21, 2010, SNC completed three successful test firings of a single hybrid rocket motor in one day.  SNC’s newly opened rocket test facility in San Diego County, California, hosted NASA personnel for a rocket motor manufacturing review as well as the motor firings, including one firing under vacuum ignition conditions.  The tests, which simulated a complete nominal mission profile, demonstrated the multiple restart capability of SNC’s proprietary hybrid rocket motor.  This same hybrid rocket will be used as the main propulsion system on the Dream Chaser during the orbital operations.

Earlier this summer, SNC completed its second major milestone.  This milestone was focused on the development of the primary tooling necessary to build the composite structure of the Dream Chaser vehicle.  The tooling required under the milestone has been completed and is now being used to begin fabrication of the first critical aeroshell structures which will be tested later this year.  NASA conducted a thorough review of all the elements of the two milestones and has certified milestone completion with no corrective actions. 

They're claiming DreamChaser will be ready for operations in 2014.

Offline blackstar

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Re: Dream Chaser for CEV requirement
« Reply #23 on: October 21, 2010, 01:23:22 pm »
They're claiming DreamChaser will be ready for operations in 2014.

We can all start taking bets now.

Offline FutureSpaceTourist

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Offline FutureSpaceTourist

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Re: Dream Chaser for CEV requirement
« Reply #25 on: December 18, 2010, 12:22:16 am »
NASA has been helping SNC perform drop tests of a 15% scale model of Dream Chaser:

Quote from: http://www.nasa.gov/centers/dryden/Features/dream_chaser_model_drop.html
Dream Chaser Model Drops in at NASA Dryden 12.17.10

NASA Dryden supported helicopter air-drop flight tests of a 5-foot-long, 15-percent scale model of the Sierra Nevada Corporation's (SNC) Dream Chaser spacecraft design under a Space Act Agreement between the two organizations.

The company's planned full-size Dream Chaser vehicle, based on the NASA HL-20 lifting body, is designed to carry up to seven people to the International Space Station and back. The vehicle is slated to launch vertically on an Atlas V rocket and land horizontally on conventional runways.

Dryden provided ground and range safety support, including a T-34 chase aircraft for photo and video imagery. The Center also provided scheduling and flight test operations engineering support, along with hangar facilities and workspace.

"Working with the SNC/CU team was a privilege. Their teamwork and dedication were phenomenal, especially through a very dynamic, tiring week of testing," said Jonathan Pickrel, NASA Dryden's flight operations engineer overseeing the testing.

The captive carry and drop flights of the 88-pound model helped validate various aspects of the Dream Chaser vehicle's configuration and performance, such as flight stability and aerodynamic data for flight control surface deflections.

"Working with NASA Dryden has always been a pleasure for me personally," said Dr. Merri Sanchez, Senior Director for Space Exploration Systems at SNC. "Sierra Nevada appreciates the excellent operational support, flexibility and flight test expertise from the NASA Dryden and Air Force teams during the conduct of our scale model test flights," Sanchez said. "We're leveraging the NASA HL-20 heritage design with our Dream Chaser vehicle that we are building to meet our Nation's need for a commercial crew transportation system, and it's great that our first subscale flight was at this NASA center."

Sierra Nevada contracted with Northwest Helicopter for the Bell 206B3 Jet Ranger helicopter that carried the Dream Chaser model on a 100-ft. cable. The helicopter dropped the model from an altitude of 14,000-feet, with landing via parachute. The model was designed, built, and operated from a collaboration between SNC and the Research and Engineering Center for Unmanned Vehicles at the University of Colorado at Boulder (CU).

SNC have also issued a statement about their CCDev2 submission and collaboration with Virgin Galactic:

Quote from: http://thisisreno.com/2010/12/virgin-galactic-joins-in-sierra-nevada-space-systems-dream-chaser-orbital-space-vehicle-program/
SPARKS, Nev. – Sierra Nevada Corporation announced today that Virgin Galactic, LLC (VG) has given its support to Sierra Nevada’s Space Systems Dream Chaser Orbital Space Vehicle development team and has been included in SNC’s submitted proposal response to NASA for the next phase of NASA’s Commercial Crew Development program known as CCDev2.

Mark N. Sirangelo, Corporate Vice President and head of Sierra Nevada Space Systems commented, “We are thrilled to have Virgin Galactic as part of our effort to make commercial orbital transportation a reality. The knowledge gained in the development and promotion of the history making SpaceShipTwo suborbital system will add considerably to our program. VG joins a growing group of world class space companies who form our Dream Chaser team and will truly enhance our efforts.”

VG will investigate ways to use its considerable expertise, reputation and experience to provide global sales and marketing services for the Dream Chaser. This effort could include the selling of seats on the vehicle as well as exploring the contracted use of VG’s WhiteKnightTwo vehicle as a carrier aircraft for the Dream Chaser during its atmospheric flight test program. This effort is an expansion of VG’s and SNC’s current multi-year relationship in which Sierra Nevada is the prime motor contractor for VG’s suborbital SpaceShipTwo program.

Commenting in Virgin’s concurrent announcement, Sir Richard Branson, founder of Virgin Galactic said: “Virgin Galactic has shown in the past few years how private sector investment and innovation can lead to a rapid transformation of stagnant technologies. We are now very close to making the dream of sub-orbital space a reality for thousands of people at a cost and level of safety unimaginable even in the recent past. We know that many of those same people, including myself, would also love to take an orbital space trip in the future, so we are putting our weight behind new technologies which could deliver that safely whilst driving down the enormous current costs of manned orbital flight by millions of dollars. Today’s announcement is an important step along the way to achieving our ultimate and long term goal of leading an industry which opens up the huge potential of space to everyone, whether it be for the experience itself, for science research, for fast and efficient transportation around the globe or for delivering payloads to space safely, cleanly and cheaply.”

George Whitesides, CEO of Virgin Galactic added, “We see the Dream Chaser Orbital Vehicle as a promising opportunity to provide safe, cost-effective low earth orbit access to a range of users. All of us at Virgin Galactic look forward to working with the SNC Dream Chaser team.”

The Dream Chaser is a human spacecraft that will transport crew and cargo to the International Space Station and will be a flexible transportation system for a variety of other commercial low Earth orbit missions. It is a reusable, piloted lifting body spacecraft that can carry seven people and critical cargo to and from orbit with a return to a standard runway landing. Dream Chaser’s heritage is based on the NASA HL-20 spacecraft and is a safe spacecraft design that features low g forces during re-entry with on-board propulsion utilizing SNC’s proprietary hybrid motor technology. SNC has been developing the Dream Chaser, as the owner and prime contractor, for over five years and in 2009 won the largest contract under NASA’s Commercial Crew Development Program (CCDev1) to advance orbital vehicle development. SNC has completed, on time and on budget, all four critical milestones under the CCDev1 program including building and testing the first vehicle structure and flight rocket motors while advancing the design of all required systems for orbital flight. SNC leads a team of eight experienced space companies and organizations working to begin commercial orbital flight operation by 2014.

The attached Dream Chaser graphic accompanies the article.

Offline OM

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Re: Dream Chaser for CEV requirement
« Reply #26 on: December 18, 2010, 03:58:31 pm »
They're claiming DreamChaser will be ready for operations in 2014.

We can all start taking bets now.

...Provider OM bids one-tenth of a Quatloo.

Offline Mr London 24/7

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Re: Dream Chaser for CEV requirement
« Reply #27 on: March 11, 2011, 08:05:00 am »

Offline Demon Lord Razgriz

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Re: Dream Chaser for CEV requirement
« Reply #28 on: March 12, 2011, 05:21:11 am »
They're claiming DreamChaser will be ready for operations in 2014.

We can all start taking bets now.

I'll bet $20 and a ticket for the first Commercial flight of DreamChaser! :D

Offline XP67_Moonbat

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Re: Dream Chaser for CEV requirement
« Reply #29 on: March 12, 2011, 03:24:43 pm »
Hey London,

Spasiba bolshoe!
In God we trust, all others we monitor. :-p