Page 11 of 11 FirstFirst ... 4567891011
Results 131 to 138 of 138
  1. #131
    Join Date
    Mar 2010
    Location
    Sunny SoCal
    Posts
    241
    Post Likes
    Quote Originally Posted by queequeg152 View Post
    ........
    i keep wondering when spacex is going to start tinkering with composite upper stage fuel tanks... nasa spent millions developing the tech years ago, and it seems perfectly scalable to my layman mind. its just CNC layup with rolls of carbon fiber over some sort of bladder diaphragm.

    they weigh something like 30% less... which translates to more delta v or more mass into orbit, and since they are not planning on recovering 2nd stage boosters, i cant help but wonder why they are not embracing that technology?

    .............
    Not an expert on such maters but google is my friend

    The reason they aren't used in rockets is simple: even the newest rockets (like the Falcon 9) were designed before composites were proven to be able to hold cryogenic propellents. Switching to a new material for the fuel tanks of the rocket would require them to re-qualify the rocket, which takes years and is very expensive. You can expect rockets to begin using these materials for fuel tanks as new rockets are developed in the coming years and decades.
    Found here
    Eric

  2. Likes Space Racer liked this post
  3. #132
    Join Date
    May 2007
    Location
    Atlanta area
    Posts
    5,247
    Post Likes
    Thread Starter
    Quote Originally Posted by queequeg152 View Post
    yo spaceracer, i take it you are a super space cadet/space enthusiast?

    maby you can answer a question for me... i keep wondering when spacex is going to start tinkering with composite upper stage fuel tanks... nasa spent millions developing the tech years ago, and it seems perfectly scalable to my layman mind. its just CNC layup with rolls of carbon fiber over some sort of bladder diaphragm.

    they weigh something like 30% less... which translates to more delta v or more mass into orbit, and since they are not planning on recovering 2nd stage boosters, i cant help but wonder why they are not embracing that technology?

    space x and elon musk in general seems to have a special talent for taking existing tech, and just putting the absolute perfect spin and tweaks on its application. but i dont think i have ever heard musk or anyone from space x talk about this? perhaps there are some terrible downsides that i am not aware of.
    SpaceX has been working on a composite tank for the ITS rocket.
    http://hvac-talk.com/vbb/showthread....1#post24366001
    http://hvac-talk.com/vbb/showthread....1#post24472611

    SpaceX Successfully Tests Mars Fuel Tank
    http://www.pcmag.com/news/349722/spa...mars-fuel-tank

    Feasibility of composite fuel tanks for BFR
    https://www.reddit.com/r/spacex/comm...tanks_for_bfr/

    NASA has been testing Boeing-built composite tanks tech for their rockets for several years. They have built a tank, but it will be a while before they can build a larger tank, test it, use it in a rocket and be sure it won't fail.

    NASA Tests Game Changing Composite Cryogenic Fuel Tank
    https://www.nasa.gov/press/2013/july...nic-fuel-tank/
    NASA says new composite fuel tank passed test, could save weight on future rockets (video)
    http://blog.al.com/breaking/2013/07/...te_fuel_t.html
    Boeing’s Composite Tank Could Greatly Improve Launch Vehicles
    http://www.parabolicarc.com/2014/04/05/composite-tank/

    NASA had trouble with a composite tank years ago and wound up canceling a rocket program because of it.
    https://www.reddit.com/r/space/comme...on_fiber_tank/

    Lockheed Martin X-33
    https://en.wikipedia.org/wiki/Lockheed_Martin_X-33

    The fuel tank does more than hold fuel. It's the load-bearing structural component of the rocket. The oxygen tank is a monocoque construction, like an egg shell. The fuel tank is a skin-and-stringer construction, like many (esp. older) airplanes.
    https://en.wikipedia.org/wiki/Stringer_(aircraft)

    SpaceX uses a lithium-aluminum alloy in the Falcon 9. Its much lighter than aluminum. It's a known, proven technology. It's wall is thicker than those of some rockets.

    Aluminium-lithium alloy
    https://en.wikipedia.org/wiki/Al-Li

    Falcon 9 Booster
    https://www.flickr.com/photos/jurvetson/2997226647/

    Inside a Falcon 9 Fuel Tank
    https://www.reddit.com/r/spacex/comm...n_9_fuel_tank/

    What's the thickness and weight of rocket tanks?
    https://space.stackexchange.com/ques...et-tanks/15385

    The Falcon 9 does use composites in combination with aluminum alloy in other parts, such as the stage connector, or the "Interstage."
    TenCate Advanced Composites materials used in SpaceX Falcon 9 rocket
    http://www.compositesworld.com/news/...alcon-9-rocket
    Falcon 9 v1.1 & F9R Launch Vehicle Overview
    http://www.spaceflight101.net/falcon-9-v11.html

    The Falcon 9 has gone through several design changes since 2010, the year it first flew. Since the rocket stages of the Falcon 9 are components of the Falcon Heavy, each time the Falcon 9 was redesigned, the scheduled debut of the Falcon Heavy had to be postponed in order to incorporate the modifications. But the latest version, the Block 5, is the final upgrade. From now on, the components will (should) be standardized, so that stages can be swapped out as needed.

    Falcon 9 Full Thrust
    https://en.wikipedia.org/wiki/Falcon_9_full_thrust

    Falcon 9 Block 5
    https://en.wikipedia.org/wiki/Falcon_9_Block_5

    Falcon Heavy
    https://en.wikipedia.org/wiki/Falcon_Heavy
    Last edited by Space Racer; 05-02-2017 at 11:21 PM.
    Vacuum Technology:
    CRUD = Contamination Resulting in Undesirable Deposits.
    CRAPP = Contamination Resulting in Additional Partial Pressure.

    Change your vacuum pump oil now.

    Test. Testing, 1,2,3.

  4. Likes queequeg152 liked this post
  5. #133
    Join Date
    May 2007
    Location
    Atlanta area
    Posts
    5,247
    Post Likes
    Thread Starter
    Lots of excellent info at the link posted at the bottom of
    ESokoloff's post above.

    Check it out.
    Vacuum Technology:
    CRUD = Contamination Resulting in Undesirable Deposits.
    CRAPP = Contamination Resulting in Additional Partial Pressure.

    Change your vacuum pump oil now.

    Test. Testing, 1,2,3.

  6. #134
    Join Date
    May 2007
    Location
    Atlanta area
    Posts
    5,247
    Post Likes
    Thread Starter
    Falcon 9 launch delay sets up potential SpaceX ‘doubleheader’ next weekend [one on Friday, one on Sunday]

    SpaceX has pushed back the liftoff of a Bulgarian television broadcast satellite on the company’s second previously-flown Falcon 9 rocket until at least Friday, giving ground crews time to replace a valve on the launcher inside a hangar at its Florida launch pad.

    The schedule slip sets up a potential SpaceX “doubleheader” with another Falcon 9 rocket being prepared for launch next Sunday, June 25, from Vandenberg Air Force Base in California.

    https://spaceflightnow.com/2017/06/1...yed-to-friday/

    SpaceX rocket passes key preflight test before liftoff from California

    Juggling simultaneous launch campaigns on both coasts, a team of SpaceX engineers put a Falcon 9 rocket through a customary countdown rehearsal and hold-down firing Tuesday at Vandenberg Air Force Base in California ahead of a scheduled liftoff Sunday.

    The commercial mission will loft 10 voice and data relay satellites for Iridium’s upgraded network, in the second of at least eight Iridium launches booked on SpaceX Falcon 9 rockets.

    https://spaceflightnow.com/2017/06/2...om-california/
    Vacuum Technology:
    CRUD = Contamination Resulting in Undesirable Deposits.
    CRAPP = Contamination Resulting in Additional Partial Pressure.

    Change your vacuum pump oil now.

    Test. Testing, 1,2,3.

  7. #135
    Join Date
    May 2006
    Location
    Ft. Worth, TX
    Posts
    6,809
    Post Likes
    Space Racer, are you traveling to the moon in your lifetime? Honest question.
    No one is useless in this world who lightens the burdens of another. -- Charles Dickens

  8. #136
    Join Date
    Jun 2017
    Posts
    13
    Post Likes
    Amazing tech right there.

  9. #137
    Join Date
    Mar 2010
    Location
    Sunny SoCal
    Posts
    241
    Post Likes
    Last night's successful Hispasat launch marked the 50 Falcon 9 launch in less then 8 years.
    It also was the heaviest geosynchronous insertion mission to date.

    Unfortunately the coveted titanium grid-fins were not recovered.


    https://www.teslarati.com/spacex-tes...s-50th-launch/
    Eric

  10. #138
    Join Date
    May 2007
    Location
    Atlanta area
    Posts
    5,247
    Post Likes
    Thread Starter
    Vacuum Technology:
    CRUD = Contamination Resulting in Undesirable Deposits.
    CRAPP = Contamination Resulting in Additional Partial Pressure.

    Change your vacuum pump oil now.

    Test. Testing, 1,2,3.

Page 11 of 11 FirstFirst ... 4567891011

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.