More Q-Jets

Discussion in 'Propulsion' started by jqavins, Sep 19, 2019.

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  1. Sep 19, 2019 #1

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

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    Sorry if this is old news; it was new to me. I sent this to Quest:
    I have just read that all Aerotech branded 18 mm motors have been discontinued in favor of the Q-Jet line. Yet there are - er, were - other motors that are very useful and now apparently not available. Are there plans to introduce any other Q-Jet motors?

    I will particularly miss the D10 and D21 motors; the D16 is terrific but not punchy enough for some applications due to its progressive burn.

    And I received this in reply:
    Be careful what you wish for ;), yes, we are planning on adding to the Q-Jet line
     
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  2. Sep 19, 2019 #2

    Nytrunner

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    Introducing the D80 Super Thunder?
     
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  3. Sep 19, 2019 #3

    neil_w

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    Sounds fantastic! Shouldn't get too excited yet though, the Qjets took a pretty long time to get to market.
     
  4. Sep 19, 2019 #4

    dhbarr

    dhbarr

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    Oh man, with modern propellant and materials an 18mm E could maybe return to take our tiny electronics for a spin?

    I can dream :)
     
  5. Sep 19, 2019 #5

    Charles_McG

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    13mm C
     
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  6. Sep 19, 2019 #6

    Maxwelljets

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    It doesn't look as though the 18/20 reloads were discontinued, and I wasn't aware of any other single use 18mm Aerotech motors besides the D10 and D21. Were there others that I missed?
     
  7. Sep 19, 2019 #7

    Cape Byron

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    I wonder if the Q-Jets will ever make it to Oz? Lots to think about...

    Okay, now I'm drooling.
     
  8. Sep 20, 2019 #8

    jqavins

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    From my previous calculations, One should only expect one letter up for a given size. 18 by 70 should only go to d and 13 mm only to B.
     
  9. Sep 20, 2019 #9

    Charles_McG

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    13mm Bs are fine.

    But you can make longer cases.
     
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  10. Sep 20, 2019 #10

    rharshberger

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    especially since I no longer build rockets with motor blocks.....
     
  11. Sep 20, 2019 #11

    Charles_McG

    Charles_McG

    Charles_McG

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    Exactly.
     
  12. Sep 20, 2019 #12

    jlabrasca

    jlabrasca

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    Or a longer burning 13mm A. An A-10 with a 2 second burn would be fun to fly.
     
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  13. Sep 20, 2019 #13

    Initiator001

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    I was at AeroTech when the 18mm x 3.875" E45 motor was introduced back thirty years ago.
    A full 40 n-sec motor.
    I think they were $10/each back then.
    Discontinued for lack of sales. :(
     
  14. Sep 20, 2019 #14

    Initiator001

    Initiator001

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    AeroTech worked on these thirty years ago.
    Too many casing issues.

    Tried 15mm diameter casing.
    Had to be a fast burn.
    Resulted in a 'C26' with around 8.5 n-sec.
    Still not successful.
     
  15. Sep 20, 2019 #15

    dhbarr

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    Mach1 18mm FG tubing, Bear AltiDuo SMT, TeleMini V3 -- rather a different landscape.

    Routine mach-breaking Model Rocket flights would be fairly straightforward....

    Like I mention, dreams. :)
     
  16. Sep 20, 2019 #16

    Initiator001

    Initiator001

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    AeroTech made 13mm 'B7' motors for Apogee.
    Much manual labor to produce.
    Cost was $8/each back thirty years ago.
    Low sales and discontinued.
     
  17. Sep 20, 2019 #17

    Initiator001

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    Couldn't make an 13mm 'A' motor.
    The nozzle throat would be too small to fit an igniter through.
     
  18. Sep 20, 2019 #18

    BEC

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    So, Bob, any idea what these new Q-Jets might be? I'd be happy with a full or nearly full D that sort of replaces the SU D10 and D21, especially if it's not a cranky to get lit as D10s are.

    Of the current line, the C12s are, by far, my favorite.
     
  19. Sep 20, 2019 #19

    BABAR

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    MicroMaxx igniters are pretty slim
     
  20. Sep 20, 2019 #20

    dhbarr

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    .... and nozzles aren't always that important :-D
     
  21. Sep 20, 2019 #21

    cerving

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    The Estes PSII igniters work greate with D10/D21's. I've done airstarts with them.
     
  22. Sep 20, 2019 #22

    Initiator001

    Initiator001

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    Yes. ;)
     
  23. Sep 20, 2019 #23

    Initiator001

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    It's easier to ignite BP than APCP propellant.
     
  24. Sep 20, 2019 #24

    BEC

    BEC

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    That's a lot of help! :eek::rolleyes:
     
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  25. Sep 20, 2019 #25

    BEC

    BEC

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    My experience with D10s and Sonic igniters is about 1/3 to 1/2 success rate. D21s, being Blue Thunder, are another story and much easier.

    Now a Sonic igniter on a 6-9V system rather than 12, that would likely work better. What did you use for electrical power in your air starts, Cris?
     
  26. Sep 20, 2019 #26

    Theory

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    this is good news and i have fond memories of the blue thunder E25s. an 18mm with super blue thunder or the new white lightning used in the F67/G74 would be cool.

    all that said, i will miss the D10. thats a great little motor. expensive, yes, but boy howdy does it make for a nice flight!
     
  27. Sep 20, 2019 #27

    jqavins

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    I'd just like to see the D10 and D21 relabeled. With a CTI-esque BP pellet or some such to help light the D10. (A painted on layer of nitrocellulose?) Then start dreaming up new stuff.
     
  28. Sep 20, 2019 #28

    Theory

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    if im going to dream, i will look to the 18mm F55.

    the large HP stuff is fun, but boy, high impulse 18mm is a darn good time too!!!
     
  29. Sep 20, 2019 #29

    Alan15578

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    I never bought any of those, but I wish I had. A pair of those would have been perfect for kicking a hybrid propellant rocket off the rail.
     
  30. Sep 20, 2019 #30

    Alan15578

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    My recollection is a little different, but you should know. The B7 was not an AeroTech motor, it was an Apogee motor that TVM produced at the Aerotech facility, and it was designed by a third party. TVM was mainly leveraging AeroTech's pemits, but also the facilities and supplies, and probably some labor as well. TVM was on site in Las Vegas when his motors were made. The E6 and F10, are clearly Aerotech motors, some of which were relabeled as Apogee motors. Apogee and TVM is due a little more credit for some of those motors like the B7. Low sales may have been a factor, but they were discontinued when TVM decided not to continue production at the new AT facility. I don't know the nitty-gritty details of the Apogee/Aerotech operation.
     

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