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  1. #271
    Join Date
    18th December 2010
    Location
    Maryland, 20794
    Posts
    497
    TRF,

    Our goal is to complete construction on 31 January. That is just two weeks from now. A lot to do in short time.

    Progress is made on the booster (tail unit). First we fabricated a frame for both assembly and shipping. It is made from 1-inch steel tubing and locking castors. Note the booster is 120 inches length and 117 inches span. It weighs about 220 pounds. We think the frame is a good investment given the booster’s scale.

    The assembly frame is pictured below. Note second photo where we added A-braces on either end along with some corner braces. The fame is quite stiff.

    Servo boxes are built up including internal X-braces. Those appear strong and tough. Still we may fill those with 3 pound density foam. There is a lot of momentum in a near 300 pound booster landing 15 feet per-second.

    Rudder boxes are also built. Those will be foam filled pieces considered sacrificial “bumpers” to an off center booster landing.

    This coming weekend is devoted to skinning the booster. Will be our most challenging piece.

    Feckless Counsel

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  2. #272
    Join Date
    20th January 2009
    Location
    Johnson City, NY
    Posts
    2,019
    This is just amazing!!!!

    Rocket Addict
    More...more...I'm still not satisfied (T. Lehrer)

  3. #273
    Join Date
    31st July 2011
    Location
    USA
    Posts
    306
    Absolutely Awesome...
    Fred Wallace
    TRA 5763, TAP
    MDRA Lifer
    I need a Kevlar wrap for my truck..

  4. #274
    Join Date
    20th February 2009
    Location
    Cayuga, Indiana
    Posts
    12,882
    Wow, the fins are impressive. What is the thickness?

    I just might have to make a road trip!

    From the Ether...
    L3, TRA #11847
    Tripoli Indiana #132
    Tripoli Central Illinois #59
    Central Illinois Aerospace (NAR) #527
    Chicago Rocket Mafia, "Big Bucks" Dixon
    ___________________________________

    Quiet little voices creep into my head. -- We Were Promised Jetpacks

  5. #275
    Join Date
    18th December 2010
    Location
    Maryland, 20794
    Posts
    497
    John & John,

    Altitude is lowered to 1km or 3,300 feet. That keeps us in the field with apogee deployment. Hoping for a gentle pull on top.

    Djs,

    "Short" cord means about 3 feet. Really is a “riser” just long enough for shroud lines to clear the canister.

    Les,

    So good to hear from you. I recall we bought the X-Celerator kit same Black Friday sale. Had a good time collaborating across our builds. I believe, old man, that year was 2010?

    Fred,

    You are TAP for this bird. Anything you want to see, bend or yank better get up to the shop now. We are closing it up and off to paint next two weeks.

    Tim,

    Fins at their thickest are 6-inches. That is right where fins meet their rudder guards.

  6. #276
    Join Date
    20th February 2009
    Location
    Cayuga, Indiana
    Posts
    12,882
    Quote Originally Posted by Feckless Counsel View Post
    Tim,

    Fins at their thickest are 6-inches. That is right where fins meet their rudder guards.
    Now that's some girth!




    From the Ether...
    L3, TRA #11847
    Tripoli Indiana #132
    Tripoli Central Illinois #59
    Central Illinois Aerospace (NAR) #527
    Chicago Rocket Mafia, "Big Bucks" Dixon
    ___________________________________

    Quiet little voices creep into my head. -- We Were Promised Jetpacks

  7. #277
    Join Date
    13th November 2009
    Location
    Greater Chicago Area
    Posts
    4,622
    As large as that is, you might consider an FX pipe conduit near launch time to simulate LOX venting.

    Click image for larger version. 

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    Greg

  8. #278
    Join Date
    7th July 2013
    Location
    Toronto
    Posts
    3,398
    Quote Originally Posted by GregGleason View Post
    As large as that is, you might consider an FX pipe conduit near launch time to simulate LOX venting.

    Click image for larger version. 

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    Greg
    That would be pretty cool to have it venting for a while while the rocket was going through last min prep.
    Michael Pitfield
    TRA 14579 L2
    NAPAS BoD
    URRG
    MARS
    CRC

  9. #279
    Join Date
    31st December 2009
    Location
    Las Cruces, NM
    Posts
    1,487
    Quote Originally Posted by GregGleason View Post
    As large as that is, you might consider an FX pipe conduit near launch time to simulate LOX venting.

    Click image for larger version. 

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    Greg
    I've seen that done with a chunk of dry ice. Better than a smoke charge which leaves a residue and adds a fire hazard.
    -John

    NAR/TRA L3
    My LinkedIn Profile

  10. #280
    Join Date
    5th December 2013
    Location
    MD
    Posts
    7,110
    A cool idea from a visual standpoint, but I imagine the team will already be facing as many complications as they can handle.

    John S. ---- NAR #96911 ---- TRA #15253 ---- MDRA #067 ---- BARC #028
    L1, 3/15/14: Aerotech Sumo, CTI H133BS
    L2, 6/21/14: Giant Leap Vertical Assault, CTI J240RL
    L3, 3/12/16: MAC Performance Radial Flyer, CTI M1101WH
    Altitude: 13,028', L3 flight; Speed: Mach ???, L3 flight

  11. #281
    Join Date
    31st December 2009
    Location
    Las Cruces, NM
    Posts
    1,487
    Quote Originally Posted by Bat-mite View Post
    A cool idea from a visual standpoint, but I imagine the team will already be facing as many complications as they can handle.
    They need something to cool the champagne anyway, so no extra effort. ;-)
    -John

    NAR/TRA L3
    My LinkedIn Profile

  12. #282
    Join Date
    20th February 2009
    Location
    Cayuga, Indiana
    Posts
    12,882
    Quote Originally Posted by jsdemar View Post
    They need something to cool the champagne anyway, so no extra effort. ;-)
    Champagne?! I'm in!!!

    Click image for larger version. 

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    L3, TRA #11847
    Tripoli Indiana #132
    Tripoli Central Illinois #59
    Central Illinois Aerospace (NAR) #527
    Chicago Rocket Mafia, "Big Bucks" Dixon
    ___________________________________

    Quiet little voices creep into my head. -- We Were Promised Jetpacks

  13. #283
    Join Date
    26th November 2009
    Posts
    5,070
    I hope this flight is nominal so the ecstatic celebrations can begin. My inexperience says to try and set her down as slow as possible (stupidhead here says use a big chute) to protect that rear end for future flight endeavors. Kurt

  14. #284
    Join Date
    21st April 2011
    Location
    Australia
    Posts
    58
    Quote Originally Posted by GregGleason View Post
    As large as that is, you might consider an FX pipe conduit near launch time to simulate LOX venting.

    Click image for larger version. 

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    Greg
    Great idea - CO2 would do it, cheap and safe...
    Me and my rockets run on moonshine.
    Lvl 1 - Scratch built 1/4 scale D-Region Tomahawk AT I600.
    Lvl 2 - Performance Rocketry Nike Smoke AT K1100.
    Lvl 3 - Scratch built 2/3 scale D-Region Tomahawk AT M650.

    Jason Batey - TRA13325
    Jase's Youtube Channel.

  15. #285
    Join Date
    15th March 2016
    Posts
    355
    Careful, cryogenic temps make many materials brittle...

    Plus large temperature changes can destroy glue joints when dissimilar materials are joined; if the thermal expansion of the materials is different, you could start popping joints. The skin could come off the frame, or crack.

    Make sure any dry ice is well insulated and separated from anything structural. While it would be cool to have special effects, it's not worth it if they compromise the whole project...

  16. #286
    Join Date
    2nd August 2009
    Location
    East-Central, IL
    Posts
    524
    Where and when is your flight date?
    Some of us will need to make travel plans.
    NAR# 91016 SR
    L1 8/14/2010
    L2 3/24/2012

  17. #287
    Join Date
    5th December 2013
    Location
    MD
    Posts
    7,110
    Quote Originally Posted by gary7 View Post
    Where and when is your flight date?
    Some of us will need to make travel plans.
    The where is MDRA. The when has not been determined yet.

    John S. ---- NAR #96911 ---- TRA #15253 ---- MDRA #067 ---- BARC #028
    L1, 3/15/14: Aerotech Sumo, CTI H133BS
    L2, 6/21/14: Giant Leap Vertical Assault, CTI J240RL
    L3, 3/12/16: MAC Performance Radial Flyer, CTI M1101WH
    Altitude: 13,028', L3 flight; Speed: Mach ???, L3 flight

  18. #288
    Join Date
    31st July 2011
    Location
    USA
    Posts
    306
    Quote Originally Posted by Feckless Counsel View Post




    Fred,

    You are TAP for this bird. Anything you want to see, bend or yank better get up to the shop now. We are closing it up and off to paint next two weeks..
    I have been following along and we have talked. I am good with it. If you are working this next weekend, I might be able to make Saturday, just to eyeball and cheer you and your team on... So, don't slow down for me... You have my phone and email...
    Last edited by Frederocket; 23rd January 2018 at 03:02 AM.
    Fred Wallace
    TRA 5763, TAP
    MDRA Lifer
    I need a Kevlar wrap for my truck..

  19. #289
    Join Date
    18th December 2010
    Location
    Maryland, 20794
    Posts
    497
    TRF,

    This weekend was another 20 hour marathon session. Applying skin to the booster is, as we suspected, the most difficult phase of construction. Using templates we cut fiberglass for the leading edges, body and fin valleys. Our decision was to apply fiberglass in that same order. In retrospect it may have been cosmetically better to go leading edge, then fin valley and then body.

    Rudders are filled with US Composites 3 pound density expanding foam. Advertised expansion is 20:1. Each rudder is 19 liters. We used 1 liter of mixed material and have the result illustrated below. Next is saw off the excess and apply the final skin.

    We have made escape tower rocket nozzles using scraps of fiberglass skin and plywood templates. We will probably also fill those with expanding foam.

    Feckless Counsel
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  20. #290
    Join Date
    18th December 2010
    Location
    Maryland, 20794
    Posts
    497
    TRF,

    Booster is now completely skinned. That application was the most tedious and time consuming phase of the project. Several mistakes had to be reworked but overall we are happy with the outcome.

    Capsule is well underway with about 80% of its surface skinned. We expect to finish capsule this weekend along with a few remaining tower parts

    Then we have long list of punch out items. None of those tasks are extensive but there are a lot. Hope is we ship out to paint and decoration 26 February.

    Looks like we are on track for an early April launch.

    Feckless Counsel
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  21. #291
    Join Date
    30th April 2012
    Location
    St. Louis, MO.
    Posts
    657
    Do you intend to ground test the recovery system?

    Mike Walsh
    NAR L3 - 07/27/2013

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