18mm Q-jet C & D Motors now availble to order on QuestAerospace.com

Discussion in 'Low Power Rocketry (LPR)' started by DankMemes, Aug 9, 2018 at 5:37 PM.

  1. Aug 9, 2018 at 5:37 PM #1

    DankMemes

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    picked up one pack each of the C12 and D16 motors, have some heavier models and curious how they'll fly on this, very short burn times but looks to be a good punch off the pad... We'll see..
     
  2. Aug 9, 2018 at 6:20 PM #2

    kuririn

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    Pre-orders only, shipping mid to late August.
     
  3. Aug 9, 2018 at 6:41 PM #3

    DankMemes

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    Here's hoping for mid-august... Looking forward to the D's especially. Have a vintage Venus Probe thats waiting for that one. Flown in on a D-21 and it did well
     
  4. Aug 9, 2018 at 6:51 PM #4

    kuririn

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    I have a couple of bricks, the MPC Vostok and Titan II. Should be interesting, heads up flights.
     
  5. Aug 9, 2018 at 9:58 PM #5

    BABAR

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    I modified Venus Probe and Exoskel rockets with 24 mm motor mounts just so that I could use D engines.

    I really wonder what the engineers were thinking with some of the Estes designs that were designed for 18 mm. IMO waaay underpowered. A reasonably priced 18 mm D would be nice.
     
  6. Aug 9, 2018 at 10:27 PM #6

    Brian H.

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    I had the pleasure of doing a demo launch for the guys from Aerotech at NARAM on Monday.
    The D16 in a Der Red Max is very impressive!
    I can see it easily lifting the heavier 18mm models. I have a Mercury Redstone that flew once on a C6-3 and then set on the shelf because it was not near enough motor.
     
    Last edited: Aug 9, 2018 at 10:44 PM
  7. Aug 10, 2018 at 12:46 AM #7

    Initiator001

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    These new Quest C12 and D16 motors have PROGRESSIVE burns. This means that the motors reach maximum thrust about halfway into the burn, not at ignition.
    These motors would not be good choices for heavy or draggy models.
     
  8. Aug 10, 2018 at 1:21 AM #8

    Daddyisabar

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    I flew the Estes Mercury Redstone on the D16 4 just after your DRM. Plenty of thrust for that model off the pad. The ejection charge will just be increased on the short delay motors, allowing you to fly the Estes piggies like the MR, Xarc Cruiser and Dark Silver. At the manufacturer's forum a guy had successfully clustered the B's.
     
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  9. Aug 10, 2018 at 1:27 AM #9

    Brian H.

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    Yes, they are progressive,but when the D16 starts with 2N higher thrust vs the C6 and then goes up from there, it will fly a heavy rocket designed for a C6 much better.
     
  10. Aug 10, 2018 at 12:27 PM #10

    jadebox

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  11. Aug 10, 2018 at 2:36 PM #11

    Brian H.

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  12. Aug 10, 2018 at 2:43 PM #12

    neil_w

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    The interesting thing to me is how the Q-jets spool up so quickly compared to the BP motors. I would *think* that would translate to higher velocity off the rod, which would be very useful for heavier models.

    On the other hand, I would like to see the same picture comparing a D16 to a C11.
     
  13. Aug 10, 2018 at 2:44 PM #13

    DankMemes

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    Interesting... I too have a Redstone sitting on the shelf I wish I built with a 24mm mount looks like initial thrust is close enough to the C6 that I’d be comfortable flying this in there, I’ll have to try the D16 in a few Burner rockets first to see how hot they run, had a D21 cook a motor mount in a big Bertha once not pretty but it flew like a bat out of hell
     
  14. Aug 10, 2018 at 2:59 PM #14

    lakeroadster

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    Last edited: Aug 10, 2018 at 3:05 PM
  15. Aug 10, 2018 at 3:06 PM #15

    neil_w

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    Man I had to hunt to figure out where you guys were getting the compare motors function on RocketReviews. Seems way too hidden for such a useful feature.

    Anyway, that makes it seem like the D16 Q-jet would be a suitable substitute for a C11. The C12 Q-jet, on the other hand, doesn't have as much kick off the rod as a C11, so I'd need to be very careful with it. I'll have to get the C12 and D16 into OR and try them out with some of my sims. For my smaller and lighter 24mm rockets they might both be great; for the larger ones, maybe just the D16.

    Running the Q-jets in a 24mm-18mm adapter has the further benefit of insulate the motor mount from the heat of the motors. Don't care if I scorch an adapter.
     
  16. Aug 10, 2018 at 3:12 PM #16

    jadebox

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    RocketReviews.com lists 14.09 N as the max thrust of the C6 while ThrustCurve.org says 14.10. Pretty close. :)

    The graph at RocketReviews.com doesn't round off the peak in the graph of the thrust curve, so the plots look different.
     
  17. Aug 10, 2018 at 4:03 PM #17

    DankMemes

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    I have an exo-skell sitting in box, as after flying my venus probe it was obvious I wanted to put a bigger motor mount in the exo-skell... However it has one of those ABS Injection molded fin cans with integrated motor mount.

    How did you go about getting a 24mm in there, did you ditch the stock fin can and build your own?
     
  18. Aug 10, 2018 at 4:21 PM #18

    Brian H.

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    I was just looking at the first graph posted by Domansky. There are 2 more by John Coker that are more accurate and match the published info from NAR testing.
     
  19. Aug 10, 2018 at 6:34 PM #19

    Daddyisabar

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    I heard from a fly on the metal post of the NARAM pop up that the published thrust curves were conservative and the hope was these motors could be used in most Rockets using a D12! Having seen them fly my skepticism was tempered. Would I put it in my Mars Lander? Yes. My Rock-it? Yes My Titan III E? Maybe. My Noris Vostok? No.
     
  20. Aug 10, 2018 at 7:04 PM #20

    Steve Shannon

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    How could published thrust curves be conservative?
     
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  21. Aug 10, 2018 at 7:09 PM #21

    Daddyisabar

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    Maybe they think they can get a bit more umph in the future?
     
  22. Aug 10, 2018 at 7:32 PM #22

    solid_fuel

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    I like these comparison charts. How how do you do the chart? What about a chart comparing an Estes D12 compared to a Quest D16?
    Thanks in advance.
     
  23. Aug 10, 2018 at 7:34 PM #23

    Steve Shannon

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    If these motors are already certified, that should require a recertification if they do. The whole reason for certification is so flyers have reassurance that the motor will fly as tested.
    If these are manufacturers demos then I could see them trying to tweak the motors before submitting for certification, but once they are certified they should not change.
     
  24. Aug 10, 2018 at 7:49 PM #24

    lakeroadster

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    The ROCKETREVIEWS site does the comparison.. you pick the motors, it creates the graph and chart.

    Here's the Quest D16 Q-Jet to Estes D12: https://www.rocketreviews.com/compare-motors-464170.html

    Look at the bottom left of the page, click on "What You Can Do".
     
  25. Aug 10, 2018 at 7:58 PM #25

    Daddyisabar

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    These were manufacturer's demo flights. Had to fill out on the flight card and prep rocket at the table. They inserted the new shrink tape igniter. Still working out potential bugs on securing the igniter so I was careful at the pad attaching the leads. It held in just fine. They will tweak the ejection charge back up on the short delay motors.
     
  26. Aug 10, 2018 at 8:10 PM #26

    Steve Shannon

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    Thanks! It all makes sense then.
     
  27. Aug 10, 2018 at 8:23 PM #27

    solid_fuel

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    Dude, that’s so sweet!
     
  28. Aug 10, 2018 at 9:05 PM #28

    lakeroadster

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  29. Aug 10, 2018 at 9:13 PM #29

    Daddyisabar

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    This was the last demo flight. Bring forth the lambs for the ritual. No super light 3FNC Alpha with blue Quest waddling. This was the nightmare scenario. A sports scale Estes MR with no engine hook or block. Previously flown only on AT 18 mm reloads with a handful of nasty dog barf. Motor friction fit, stock nose weight in place, all that drag from the escape tower. The sacrificial beast was launched, and like Monty Python and the Holy Grail, the new science of determining the future from the contents of a sheep's liver was employed. Top men examining the rocket's contents on the table. All the little bits revealed much joy for the future.
     
  30. Aug 14, 2018 at 4:34 AM #30

    BABAR

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    I built an add on section (sort of like a booster section, except instead of an upper stage engine the 24 mm engine in the bottom section just blows through the fin can to pop the chute.)
    Build thread here
    https://www.rocketryforum.com/threads/exo-skell-build-thread.36956/#post-354993
     

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