AeroTech Open Thread

Discussion in 'Propulsion' started by ATGM, May 16, 2015.

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  1. Feb 23, 2020 #3,361

    mikec

    mikec

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    I expect it's a business decision motivated by low sales volume.
     
  2. Feb 23, 2020 #3,362

    Theory

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    the casings became more expensive and the demand isn't there.

    too bad as I am also a fan of these. lots of fun for smaller fields. have VERY fond memories of the E25 from yester year
     
  3. Feb 23, 2020 #3,363

    Nytrunner

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    The D13 and D24 reloads are still there.

    I just flew one yesterday, and it wasnt as fiddly as i predicted. (If you can build a delay, yiu csn build the 18/20)
     
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  4. Feb 23, 2020 #3,364

    mbeels

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    I just picked up one of the 18/20 cases. I'm wondering if the delay grain can be adjusted by drilling, or should I pick up some hobby delay kits?
     
  5. Feb 23, 2020 #3,365

    cwbullet

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    I will miss the single use Ds from AT. Having a high thrust motor that you can afford to lose is a great tool in the motor box.
     
  6. Feb 23, 2020 #3,366

    AeroTech

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    A batch of casings were received from the vendor that were not sufficiently reliable, and we had no recourse with them, or assurance that it would not happen again. Making new molds for stronger cases would have cost more than we were willing to spend. That’s when we pulled the plug.
     
  7. Feb 23, 2020 #3,367

    Arsenal78

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    I just bought a Boyce Gemini Titan and the recommended motor is twin D10-5s or twin C12 QJets but it’s quite heavy so a QJet wouldn’t lift it easily. Twin 18/20 cases is too expensive and a high losing risk.
     
  8. Feb 23, 2020 #3,368

    Arsenal78

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    Is the casing that much different than the QJet ones? Seems like there’s still enough of a buying base to keep the single use 18mm stuff.
     
  9. Feb 23, 2020 #3,369

    cwbullet

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    The D24 in the metal case is similar to the D21 and there is a similar motor to the D10.
     
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  10. Feb 23, 2020 #3,370

    cwbullet

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    Sad, but understand.
     
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  11. Feb 23, 2020 #3,371

    Nytrunner

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    Arsenal's issue is that sticking two 18/20 cases in his Gemini od a latger investment than he cares for.

    However, for single motor rockets, they work great!
    20200223_101056.jpg
     
  12. Feb 23, 2020 #3,372

    Arsenal78

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    A single reload motor isn’t bad for me but I’ve lost my fair share of 24/40’s. Down here in the south, open land is rare to come across and our usual fields still have trees a bit close for comfort for reloads. Clustered reloads is definitely not something I’d risk.
     
  13. Feb 23, 2020 #3,373

    cwbullet

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    A loss is my big issue, also. A tracker in an 18mm is extra weight. I would prefer single-use. Why could it not use the Quest single-use cases?
     
  14. Feb 23, 2020 #3,374

    Arsenal78

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    .
     
    Last edited: Feb 24, 2020
  15. Feb 23, 2020 #3,375

    mikec

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    Define "huge". Presumably Gary knows exactly how many D10s they sold and if AT decided it didn't make sense, then that's pretty definitive. Too bad, as I liked the D10 too, but don't confuse a small group of fans for a huge market.
     
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  16. Feb 23, 2020 #3,376

    Theory

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    agreed. Huge is likely not accurate
     
  17. Feb 23, 2020 #3,377

    Theory

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    My custom BT55 bird. At just a tick over 4oz, she rips on a D10. Even crazier on an E20!!!
    6D2ED4B1-3FCF-4F36-9E4A-18295F056246.jpeg 431B5384-471B-4AD9-9901-0045D47085DF.png
     
  18. Feb 23, 2020 #3,378

    rcktnut

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    There are lots of LPR kits that need bigger MMT's, and easily done if not already built. That would be the kit manufactures fault and not Aerotech.
     
  19. Feb 24, 2020 #3,379

    AeroTech

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    Completely different. It can handle more heat and has a nozzle extension that allows more room in the case for propellant.

    The actual market for the D10 and D21 was very small.

    I’d be curious to know how many would be willing to participate in an Indiegogo campaign to help finance a new mold.

     
  20. Feb 24, 2020 #3,380

    shreadvector

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    2 Q-Jet D16-4 motors will lift A LOT.

    AND they are easy to ignite in clusters.

    And they are so cool.

    All the cool people are launching them.

    Don't be left out.
     
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  21. Feb 24, 2020 #3,381

    cwbullet

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    Either way, thank you for continuing to deliver high quality motors for the hobby.
     
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  22. Feb 24, 2020 #3,382

    swatkat

    swatkat

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    I've got a stash of the reloads. D13 and D24's are great for those Estes Saturns and Mercury redstones.
     
  23. Feb 24, 2020 #3,383

    dhbarr

    dhbarr

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    The d21 is my favorite low power motor, and I absolutely would jump on this at the earliest opportunity. I only have a dozen or so left :-(
     
  24. Feb 24, 2020 #3,384

    n3tjm

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    I would not cluster D10's, they are notoriously hard to ignite.

    I would chip in a few for a new mold if you keep the original total impulse. Seems like all the new case designs remove propellant. :(.

    I personally miss the B and C loads for the RMS 18/20, altough I didn't like the fact that all three reloads in a pack shared the same nozzle. This was especially true with the C4. I have always fantasized a D load using the same offset c-slot the C4 used... something like a D8 would be cool :D
     
  25. Feb 25, 2020 #3,385

    tbonerocketeer

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    AeroTech and Nytrunner like this.
  26. Feb 27, 2020 #3,386

    Robert A Jablonski

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    You know I am in on the nozel, I would gladly step up for D10, D21, (and maybe baby E) cases.
     
  27. Feb 28, 2020 #3,387

    beeblebrox

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    8 C6-0, 12 D11-9, 20 D20-0, 20 E5-0, 3 Cinerocs

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    If you fly at MDRA, I have a few D10-0's ... They will direct stage to Estes motors.
     
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  28. Mar 1, 2020 #3,388

    TheRealZaphodb

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    Are these 18mm Aerotechs? I can't find any specs on them.
     
  29. Mar 1, 2020 #3,389

    afadeev

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  30. Mar 1, 2020 #3,390

    TheRealZaphodb

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    I really like the D10-3W for the Estes Redstone. If I built the Redstone again, I'd build it for a stock Estes D engine, and not the C6-3. We've launched it multiple times, and it always weathercocks badly on the C6-3, but not the D10-3. The use of a chute release makes recovery a breeze on the higher altitude of the D.
     

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