Author Topic: Sierra Nevada’s 5-year partnership with NASA - Progress on Dream Chaser  (Read 27760 times)

Offline Robotbeat

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Thanks, both of you
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Offline Rocket Science

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Neat Schlieren photography image of Dream Chaser on the stack in the Marshall wind tunnel...

http://www.nasa.gov/centers/marshall/about/star/star120516.html
"The laws of physics are unforgiving"
~Rob, Physics instructor, aviator, vintage auto racer

Offline Jason1701

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Great header for Chris's next DC article!

Offline Rocket Science

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Great header for Chris's next DC article!
I might make it my desktop... ;D
"The laws of physics are unforgiving"
~Rob, Physics instructor, aviator, vintage auto racer

Offline BrightLight

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Mach 5, just another 12 or so to go :D

Offline Rocket Science

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Mach 5, just another 12 or so to go :D
Looks good going uphill... :)
"The laws of physics are unforgiving"
~Rob, Physics instructor, aviator, vintage auto racer

Offline Lurker Steve

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Neat Schlieren photography image of Dream Chaser on the stack in the Marshall wind tunnel...

http://www.nasa.gov/centers/marshall/about/star/star120516.html


I thought the tail fins would make a larger wake in the airflow, but it appears that blends into the wake caused by the inter-stage adapter / top of the centaur fairly well.

I see another wake caused by the transition from the centaur to the first stage, and then another wake caused by a protusion at the bottom of the first stage. Is that a problem with the CCB model, or are they looking at airflow with an SRB attached in a Atlas 412 configuration ?

Online nacnud

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I think that is a prop line.

Offline Robotbeat

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Neat Schlieren photography image of Dream Chaser on the stack in the Marshall wind tunnel...

http://www.nasa.gov/centers/marshall/about/star/star120516.html

I love the Schlieren... :) I've done it several times, and it always looks so cool!
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Offline Lars_J

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Neat Schlieren photography image of Dream Chaser on the stack in the Marshall wind tunnel...

http://www.nasa.gov/centers/marshall/about/star/star120516.html
I thought the tail fins would make a larger wake in the airflow, but it appears that blends into the wake caused by the inter-stage adapter / top of the centaur fairly well.

I see another wake caused by the transition from the centaur to the first stage, and then another wake caused by a protusion at the bottom of the first stage. Is that a problem with the CCB model, or are they looking at airflow with an SRB attached in a Atlas 412 configuration ?

I think that is a prop line.

Yep - see attached image.

Offline Rocket Science

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Neat Schlieren photography image of Dream Chaser on the stack in the Marshall wind tunnel...

http://www.nasa.gov/centers/marshall/about/star/star120516.html

I love the Schlieren... :) I've done it several times, and it always looks so cool!
A picture is worth a thousand.... :)
"The laws of physics are unforgiving"
~Rob, Physics instructor, aviator, vintage auto racer

Offline vt_hokie

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It makes me hopeful to see that real engineering is going on with this program on several fronts, and it's potentially a lot more than just a cool concept!

Offline sdsds

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Neat Schlieren photography image of Dream Chaser on the stack in the Marshall wind tunnel...

This is really cool! Questions, though:

The text mentions, "configurations were tested [...] at various launch vehicle roll angles." What about pitch? Does this particular image look like "zero angle of attack"? Has SNC or ULA said anything about pitch angles on the trajectory they intend to fly? Or about wind-shear launch constraints?
-- sdsds --

Offline vulture4

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Does anyone know the anticipated gross weight, lift-to-drag ratio, and airspeed at touchdown? Crosswind tolerance? CG range? It would be interesting to compare the DC with the X-37 given their different configuratoins, though of course data on the latter is not very accessible.

Offline BrightLight

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Does anyone know the anticipated gross weight, lift-to-drag ratio, and airspeed at touchdown? Crosswind tolerance? CG range? It would be interesting to compare the DC with the X-37 given their different configuratoins, though of course data on the latter is not very accessible.

There are a number of papers available on the HL-20, a close second to DC

http://www.ninfinger.org/models/vault2008/HL-20/HL-20%20MODEL.pdf

Google HL-20

Offline manboy

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So much for using humorous rhetorical questions to make a point.

It's still not a problem. It's the 21st Century and we have bolt & gasket technology. Don't confuse integral with permanent.


Your point and humor failed because it is wrong. Don't confuse technology as a fix for proper engineering.


Doesn't SpaceX jettison Dragon's docking adapter before entry?
Berthing mechanism. And no.
"Cheese has been sent into space before. But the same cheese has never been sent into space twice." - StephenB

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