Register here

Author Topic: Dream Chaser for CEV requirement  (Read 41084 times)

Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #75 on: July 27, 2017, 01:28:14 am »
Using the dual engine Centaur configuration as to be used for manned space flight missions on the Atlas V, in this case it's for cargo in the 552 variant.

Sierra Nevada confirms ULA will launch first two Dream Chaser cargo missions

https://spaceflightnow.com/2017/07/22/sierra-nevada-awaiting-direction-from-nasa-confirms-ula-will-launch-first-two-dream-chaser-cargo-missions/


Offline Grey Havoc

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 7665
  • The path not taken.
The sole imperative of a government, once instituted, is to survive.

Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #78 on: November 12, 2017, 12:46:42 pm »
Sierra Nevada Corp.’s Dream Chaser space plane glides successfully through a big test

Quote
Sierra Nevada Corp. said its Dream Chaser prototype space plane glided to a successful landing in California’s Mojave Desert today after being dropped from a helicopter.

Today’s uncrewed test at Edwards Air Force Base marked the first time the Dream Chaser flew freely through the air since 2013. That earlier flight was also judged successful, but the landing gear failed to deploy correctly, which caused the winged vehicle to skid off the runway and crash.

Over the years that followed, SNC repaired and upgraded the aerodynamic test vehicle in preparation for a new series of flight tests at NASA’s Armstrong Flight Research Center, within Edwards’ property.

https://www.geekwire.com/2017/sierra-nevada-corp-s-dream-chaser-space-plane-glides-test-flight/amp/

Offline fredymac

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1187
Re: Dream Chaser for CEV requirement
« Reply #79 on: November 13, 2017, 03:40:43 pm »

Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #80 on: November 15, 2017, 11:27:45 pm »
Via NASA Spaceflight forum.

Quote
Here is a transcript of today's Q&A (on twitter) with Steve Lindsey of SNC:

https://twitter.com/SierraNevCorp/with_replies

Question: 1st: Congrats!!! 2nd: the left landing gear appeared to develop a, "wicked shimmy" shortly after landing. Did that actually occur or was it some kind of optical illusion or camera artifact?

Answer: I didn't see that; good rollout so maybe an artifact?

Question: Will the cargo DC still have windows (like the test article)?

Answer: No windows on the cargo version - sad for a pilot like me 😟

Question: Do you already have an aspirational target date for the demo/maiden flight of the actual (not the test article) DC?

Answer: We are currently in discussions with @Space_Station on when our first flight will occur

Question: Looking to the future: can/will Dream Chaser launch with several launch providers after its initial flights with @ulalaunch? Such as @SpaceX, @Arianespace or @blueorigin?

Answer: We are assessing multiple launch vehicles for future missions. 

Question: What are your plans for DC in the post-ISS world?

Answer: We are looking at many different types of missions, to include stand alone science missions, satellite servicing missions, and crewed missions ... just to name a few.  We intend to be flying Dream Chasers for a long, long time. 

Question: what rocket do you guys plan to launch with?

Answer: Our first mission will be on an Atlas V rocket @ulalaunch .

Question: How many Dream Chaser spaceplanes does SNC currently plan to build and operate?

Answer: Total number will depend upon the customers and types of missions we fly.  Hopefully a whole fleet of Dream Chasers!

Question: does the Dream Chaser still have the capabilities preform an ISS orbit boost?

Answer: Yes, we do. 

Question: First off, thank you for your contributions To the space program, Steve. My question to you is: What lessons were learned from drop test 1 and what changed between the first flight and now?

Answer: We learned so many lessons from the first flight, I can't possibly list them here.  The same will be true from this flight.  And this is exactly why we flight test; to make our orbital vehicle/system better. 

Question: What’s the maximum amount of time Dream Chaser could stay on orbit, docked to the ISS?

Answer: For cargo/science resupply flights, 45-75 days.  But that's based on what @Space_Station has requested in their visiting vehicle traffic manifest; we can stay docked or berthed longer than that if needed. 

Question: Do you have internships available for college students that will provide hands-on experience with projects like Dream Chaser?

Answer: YES!! Go check out the SNC website - http://sncorp.com 

Question: For crewed flights, what abort options will Dream Chaser have if an emergency occurs during launch?

Answer: We have designed the Dream Chaser to be able to abort anytime during ascent (including while sitting on the launch pad).  For missions to the @Space_Station, we also have the ability to land at runways up the east coast of the United States.

Question: What is the future of this particular Dream Chaser vehicle after its completed all testing? Donating it to a museum?

Answer: Right now we plan to keep it in 'flyable storage' so we can use it for future test flights if needed.  It is also human rated, so when we build a crewed version in the future we'll do additional atmospheric flight test.  Then maybe to a museum!

Question: Because I think all LV's in dev't now should have REUSABILITY as a basic feature, what's SNC's aspirational target for number of reuse w/ minimal refurbishment for each D.C. spacecraft?

Answer: Our design goal is 15 flight reuse -- we'll get better data on their actual life once we start flying missions

Questions: 1) Has all the CFD/Modeling been done for launch/stress atop the Atlas V? 2) Were other firms' launchers modeled/tested? 3) Time/issues if converting to Astronaut Ferry Mission?

Answers: We've done a lot of CFD/Modeling work on the Dream Chaser and our Launch Vehicle.  We are investigating several different launch vehicles; this will include similar work.  We maintain a 'path to crew' with our vehicle; crew and cargo vehicles are about 85% common

Question: I am wondering; If the successful atmospheric Free-Flight test of @SierraNevCorp's Dream Chaser, on November 12, did not included a test-routine for the folding-wing design, when and how will that be tested?

Answer: We'll test the wing deployment system on the ground and in a vacuum & thermal chamber.  The wings are deployed on orbit - so they'll already be fixed in place prior to entry.

Question: My dad noted many similarities (visually) between Dream Chaser and X-38. Was that program the starting point for this one?

Answer: Similar, but different heritage from the X-38.  The Dream Chaser comes from NASA's HL-20 Program, which came from the Russian BOR-4 Program.  How's that for an interesting heritage?!

Question: In mid flight during the drop test,  the DC seemed to wobble from left to right. Was this normal?

Answer: Great question!  That 'wobbling' was actually an intentional 'Programmed Test Input', or PTI.  This set of maneuvers was designed to assess the responsiveness and stability of the vehicle and provide us better aerodynamic data.  Worked Great!!

Question: Why the lag on getting video out? It's so much easier for folks like me to retweet stuff when it's there to retweet - and we're ALWAYS hungry for webcasts!

Answer: It was Veteran's day weekend.  We flew at a closed airfield (Edwards AFB) -- and the men and women of the USAF deserved the weekend off!  We processed the video as soon as we had access to it.

Question: how many test flights do you think there will be after the most recent one?

Answer: We're assessing the data from this most recent test - our decision to execute additional test flights will be based on whether or not we accomplished all of our test objectives from this flight. 

Question: Was #DreamChaser being flown strictly via computer or was a human involved?

Answer: The Dream Chaser flew autonomously (via computers and pre-programmed commands).  However, we also had a flight control team capable of commanding the vehicle and analyzing telemetry in real time.

Question: Will the U.N. mission in 2021 land in the United States or outside the U.S?

Answer: We haven't made a decision on this -- but we are working this question with  @UNOOSA

Question: What's the transition has been like btwn space shuttle nd dream chaser...does smaller means less complicated or the opposite...in reference to design, aerodynamics, propulsion etc..

Answer: We took all of the lessons learned from the Space Shuttle Program and applied them to our design; making the vehicle as robust and simple as possible.  This will make Dream Chaser more reliable and less expensive to operate.

Question: I noticed that even when #DreamChaser is in contact with the ground on all 3 landing gears it is still pitched up somewhat. Most aircraft are pitched down a little. Why is that?

Answer: Our nose skid strut is a little higher but when at rest the vehicle is pretty level.  The shuttle nose gear was much shorter, and that resulted in much firmer 'slapdown' forces.  Our derotation and nose strut touchdown is much gentler by comparison

Question: what are the 2 most important safety features redesigned in DreamChaser vs Space Shuttle?

Answer: 2 that come to mind are:- We went from toxic chemicals (such as hypergolic fuels and hydrazine) to non-toxic fuels, which make for easier access to the vehicle and safer ground processing - Improved, tougher heat shield

Offline blackstar

  • Senior Member
  • CLEARANCE: Top Secret
  • **
  • Posts: 1665
Re: Dream Chaser for CEV requirement
« Reply #81 on: November 16, 2017, 06:50:32 am »
I hope someday we get to see the video of the earlier crash. I understand why they won't release it--they don't want that to be shown over and over again. But I've always thought that an open airing of the difficulties of doing this engineering is important for people on the outside, so they can understand that making it look easy is not easy.


Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #82 on: November 24, 2017, 03:03:43 pm »
Dream Chaser through critical landing test, prepares for orbital flights

Quote
With Sierra Nevada Corporation’s Dream Chaser spaceplane through a successful and critical Approach and Landing Test milestone, the company is now shifting gears to focus on the all-important first orbital flight of Dream Chaser No Earlier Than 2020.  That orbital flight will be part of Sierra Nevada Corporation’s fulfillment of NASA’s CRS2 Commercial Resupply Services cargo transportation effort for the International Space Station.

https://www.nasaspaceflight.com/2017/11/dream-chaser-test-prepares-orbital-flights/

Offline gtg947h

  • CLEARANCE: Confidential
  • *
  • Posts: 74
Re: Dream Chaser for CEV requirement
« Reply #83 on: November 25, 2017, 04:45:29 pm »
But I've always thought that an open airing of the difficulties of doing this engineering is important for people on the outside, so they can understand that making it look easy is not easy.

THIS.

Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #84 on: February 07, 2018, 12:55:28 pm »
SIERRA NEVADA CORPORATION RECEIVES OFFICIAL NASA LAUNCH WINDOW FOR DREAM CHASER® SPACECRAFT

Quote
SPARKS, Nev. , February 07, 2018 – Sierra Nevada Corporation (SNC) received NASA’s Authority to Proceed for the Dream Chaser spacecraft’s first mission, with a launch window for late 2020. The mission will provide cargo resupply to the International Space Station under the Commercial Resupply Services Contract 2 (CRS2).

“SNC has been successfully completing critical design milestones as approved by NASA, and having a timetable for the first launch is another important step achieved for us,” said Fatih Ozmen, owner and CEO of SNC. “The team has worked so hard to get to this point and we can’t wait to fulfill this mission for NASA.”

Key Mission Capabilities:

Delivers up to 5,500 kg (12,125 lb) of pressurized and unpressurized supplies and scientific research payloads
Remains attached to the space station for extended periods so crew can transfer cargo and perform science laboratory operations 
Flying laboratory that allows scientists to send commands, receive data in real-time
Powered payload science experiments can operate continuously during the mission
Critical science is conducted from the pressurized cabin (crew-tended or autonomous)
Unpressurized cargo/experiments are transferred to or from the space station via robotic operations
Returns up to 2000kg of cargo via pinpoint landing at NASA Kennedy Space Center (KSC) Shuttle Landing Facility (SLF) for immediate post-landing handover to customer, maximizing the integrity of data collected on-orbit     
“The Dream Chaser is going to be a tremendous help to the critical science and research happening on the space station,” said Mark Sirangelo, executive vice president of SNC’s Space Systems business area. “Receiving NASA’s Authority to Proceed is a big step for the program. We can’t wait to see the vehicle return to Kennedy Space Center to a runway landing, allowing immediate access to the science payloads being returned from the station.”

https://www.sncorp.com/press-releases/snc-nasa-dream-chaser-launch-window/

Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #85 on: February 07, 2018, 11:50:04 pm »
New Dreamchaser extended free-flight video:

https://twitter.com/SierraNevCorp/status/961367594858106880



Offline Flyaway

  • CLEARANCE: Top Secret
  • ***
  • Posts: 1451
Re: Dream Chaser for CEV requirement
« Reply #86 on: April 16, 2018, 09:44:16 am »
Why Sierra Nevada’s owners are betting big on Dream Chaser

Quote
To Fatih and Eren Ozmen, Dream Chaser is more than a spaceplane. It’s a vehicle to transform the entire industry.

Some highlights for me from the interview.

Talking about launchers for DC.

Quote
Eren: We also will be selecting the launch vehicle for future missions. We are working with many launch providers and they are coming up with very affordable new launch vehicles in the 2021 timeframe. After the first mission, we will have more opportunities to reduce the cost because a significant cost of our mission is the launch. We are looking at all those different partnerships with different companies, looking for synergies and strategic relationships. We are in very heavy discussions with all of them. That is helping us understand how the dynamics are changing and how to maintain our competitive place while launch costs come down and technology improves.

Talking about crewed DC.

Quote
Eren: Yes. The NASA crew contract that we got awarded is still open. And actually, we got an extension on that contract. There is no current funding right now because two other companies [Boeing and SpaceX] got the award. But the reason we didn’t get the crew contract is because supposedly we couldn’t achieve the schedule. Now you see the other two companies are behind schedule.

How they are paying for it all.

Quote
Eren: Yes. The NASA crew contract that we got awarded is still open. And actually, we got an extension on that contract. There is no current funding right now because two other companies [Boeing and SpaceX] got the award. But the reason we didn’t get the crew contract is because supposedly we couldn’t achieve the schedule. Now you see the other two companies are behind schedule.

What makes DC unique.

Quote
Fatih: A key discriminator between Dream Chaser and our competitors is that we are the only rocket-agnostic space vehicle. We are not married to any particular program.

With Dream Chaser, we have a lot of partnerships internationally. We have applications across the board, from the United Nations to working with pharmaceutical companies.

It is a unique approach that is different than what we’ve been doing for the last 40-50 years: sending capsules into space and bringing them back to splash down in the ocean. Dream Chaser lands like the space shuttle did and it leverages all the lessons learned over the years into a next-generation spaceplane.

http://spacenews.com/why-sierra-nevadas-owners-are-betting-big-on-dream-chaser/

Offline bobbymike

  • CLEARANCE: Top Secret
  • ***
  • Posts: 8396
Re: Dream Chaser for CEV requirement
« Reply #87 on: April 20, 2018, 06:09:48 pm »
http://aviationweek.com/space-symposium/dream-chaser-cargo-spaceplane-assembly-poised-begin

Quote
COLORADO SPRINGS—Sierra Nevada expects to receive aeroshell panels next month for the first orbital Dream Chaser, marking a key milestone in the run-up to the start of spaceplane assembly at the company’s Louisville, Colorado, facility.

The panels, along with the vehicle’s composite primary structure, are produced by Lockheed Martin, and form the bulk of the vehicle’s aerodynamic surfaces. The structural elements are coming together as Sierra Nevada continues through critical design review (CDR), the final phases of which are expected to be completed in July.
Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers.

Charles W. Eliot