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  1. #1
    Join Date
    29th May 2015
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    129

    Square Tube Rocket

    What will be the advantage and disadvantage of a rocket made from a square tube ? I will guess smaller fins can be use



    Click image for larger version. 

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  2. #2
    Join Date
    27th December 2014
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    Seattle, WA
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    Quote Originally Posted by Q-Aero View Post
    What will be the advantage and disadvantage of a rocket made from a square tube ? I will guess smaller fins can be use



    Click image for larger version. 

Name:	NewWay_Space_Models_Lune_R_4_square_rocket_NWY_13__42527.1371578445.500.659.jpg 
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    Advantages: maybe smaller fins (although that didn't pan out for me), maybe easier to pack chutes in the tube, different from everyone else's rockets.

    Disadvantages: Nearly everything else. You have to lay up your own tube, figure out couplers, figure out a nose cone, etc. etc. There's so much stuff that's built around standard sizes of round rockets that you don't realize how much you'll have to re-do.

    See my build thread here: http://www.rocketryforum.com/showthr...t-quite-fit-in

    NAR L1 "Cheeto Dust", scratch 54mm, H54R (before it became a G54), Mansfield, WA
    L2 "Arc Light", Madcow 2.6" Arcas, J285CL, Mansfield, WA, recovery by snowshoe

  3. #3
    Join Date
    27th August 2011
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    West Tennessee
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    Quote Originally Posted by boatgeek View Post
    Advantages: maybe smaller fins (although that didn't pan out for me), maybe easier to pack chutes in the tube, different from everyone else's rockets.

    Disadvantages: Nearly everything else. You have to lay up your own tube, figure out couplers, figure out a nose cone, etc. etc. There's so much stuff that's built around standard sizes of round rockets that you don't realize how much you'll have to re-do.

    See my build thread here: http://www.rocketryforum.com/showthr...t-quite-fit-in
    I disagree. At least for low power and mid power. Can't speak for high power

    Nose cones? Easy and CHEAP! Can readily be folded out of card stock origami style to fit any size you want the make.

    Body tubes? Can be folded out of poster board, may have to double it up.

    Centering rings? Well, they would be squares. Again at least for low power can be cut out of foam board easily. I have an 18 mm drill mounted hole saw which, with a touch of sanding will easily and securely fit BT-20 for an 18 mm engine motor mount. A 24 mm works to fit a BT-50 for 24 mm mounts. Drill your hole first, then center your square cut around the hole and cut out with an exact knife and a metal ruler.

    Fins? Don't understand how you think you can use smaller fins, if anything due to increased drag from the origami geometrically angled cone will move CP a bit forward and you will need more fin area. But attachment? Think literally outside the box. Stick the fins flat along the side sticking out parallel to the sides of the rocket. They won't look symmetrical but your alignment will be automatically perfect and they will work fine, and look cool.

    Performance? Okay, definitely will take a hit, but you aren't building for altitude, you are building for the cool factor (and its cheap, for simple LPR rockets I have read that the most expensive part of the kit is usually the nose cone.) As I said, for card stock costs you next to nothing. Can't say that for a standard o give 1, 2, 3, or 4 inch cone.

    By the way, why stop at square? Think triangle, pentagon, hexagon.
    Think outside the circle!
    Last edited by BABAR; 10th January 2017 at 04:01 AM.
    It is amazing what you can do when you don't have a choice.

    Smart people learn from their mistakes.
    REALLY SMART PEOPLE learn from OTHERS' mistakes.

  4. #4
    Join Date
    14th March 2009
    Location
    Ohio
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    3,186
    There is a rocket company that makes square rockets; I have a few of them. The company is called NewWay. Here is a link to their kits at eRockets: http://www.erockets.biz/newway-model-rocket-kits/
    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  5. #5
    Join Date
    18th March 2012
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    Huntsville, AL
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    And while you're building this, you might as well enter it in the contest going on right now
    http://www.rocketryforum.com/showthr...-first-quarter
    Matt, Tripoli #14257
    L1 11/13/16
    L2 2/25/17
    L3 Spring 2018....
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  6. #6
    Join Date
    27th August 2011
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    West Tennessee
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    Quote Originally Posted by blackbrandt View Post
    And while you're building this, you might as well enter it in the contest going on right now
    http://www.rocketryforum.com/showthr...-first-quarter
    Thanks for showing me this Matt!
    It is amazing what you can do when you don't have a choice.

    Smart people learn from their mistakes.
    REALLY SMART PEOPLE learn from OTHERS' mistakes.

  7. #7
    Join Date
    15th October 2016
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    Huntsville AL
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    1,691
    There's a good square build thread in the Hi-power forum.
    Search for "Dimetrodon"(fixed spelling) by Boatgeek.
    Last edited by Nytrunner; 10th January 2017 at 06:23 PM.

  8. #8
    Join Date
    3rd August 2011
    Location
    Reed City, Michigan
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    For centering rings, get some 13mm, 18mm, or 24mm to BT-80's and square them up, or hex em or what ever.

  9. #9
    Join Date
    5th December 2013
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    MD
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    If you are using an altimeter, especially for dual deployment, then the calculation of volume for the AV bay is very different. Talk to someone who has done this to get a good idea of the number and location of sampling ports.

    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

  10. #10
    Join Date
    11th January 2013
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    S.Tpa
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    Quote Originally Posted by Zeus-cat View Post
    There is a rocket company that makes square rockets; I have a few of them. The company is called NewWay. Here is a link to their kits at eRockets: http://www.erockets.biz/newway-model-rocket-kits/
    That Exocet is pretty cool-
    http://www.erockets.biz/newway-flyin...exocet-nwy-24/
    I have gone to find myself, If I return before I get back- Keep me here.

  11. #11
    Join Date
    19th February 2009
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    Auburn, WA USA
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    The pic in the original post is a NewWay Lune R-4, which is a square interpretation of the Semroc Lune R-1. The fins on the original Semroc design are just as small......

    I'll try to post a pic of the two of them side by side later tonight.
    Bernard Cawley
    NAR 89040 L1
    AMA 42160
    KG7AIE

  12. #12
    Join Date
    22nd January 2013
    Location
    Alexandria, VA
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    Built one out of a FedEx tube. I made the nose cone out of 1/4" birch ply and paneling for the centerings and fins.
    Flew just fine.
    Dave Alewine
    TRA 7299 L3, NAR 83701 L3
    Alexandria, VA
    Maryland Delaware-Rocketry Assoc.
    Lvl 1- AT H220--Lvl 2- AT J350--Lvl 3- AT M1297

  13. #13
    Join Date
    27th March 2014
    Location
    Pennsylvania
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    124
    Quote Originally Posted by Bat-mite View Post
    If you are using an altimeter, especially for dual deployment, then the calculation of volume for the AV bay is very different. Talk to someone who has done this to get a good idea of the number and location of sampling ports.
    This square tube rocket has its avbay located in a corner of a body tube and had avbay problems as John mentions.
    http://www.rocketryforum.com/showthr...LAR-BODY-TUBES
    Tom Cohen
    MDRA....Maryland

  14. #14
    Join Date
    19th February 2009
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    Auburn, WA USA
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    Here are the Lune R-4 and Lune R-1, finished similarly (and on the same day). The square tubing is much thicker and so the Lune R-4 is half again heavier (2.4 vs. 1.6 ounces). The Lune R-1 is 1 inch in diameter, the Lune R-4's body tube is 1 inch square and the lengths of the body and payload tubes are the same. The fins on the Lune R-4 are slightly larger in both chord and span. Both fly well.
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    Last edited by BEC; 11th January 2017 at 07:30 AM.
    Bernard Cawley
    NAR 89040 L1
    AMA 42160
    KG7AIE

  15. #15
    Join Date
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    It's like Superman and Bizarro Superman.


    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

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