Gotta love QT from PML

Discussion in 'High Power Rocketry (HPR)' started by AfterBurners, Jan 18, 2020.

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  1. Jan 21, 2020 #31

    AfterBurners

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    Both of you are ridiculous ...bending on the rail? Really!! T***************************88
     
    Last edited by a moderator: Jan 24, 2020
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  2. Jan 21, 2020 #32

    manixFan

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    I would have used more gentle language but in all my flights here in Texas in the how summer sun I don't think I've ever experienced that. It's never gotten soft in the heat, the big issue is how much it shrinks in the cold. I still have some QT out in the garage (in Texas) that is probably 20 years old and it's still straight.


    Tony
     
  3. Jan 21, 2020 #33

    rcktnut

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    I have several PML kits as well as a scratch built 4 in. QT rocket never had a problem. They must have been confusing Blue Tube 1.0 with the QT.;)
     
    Last edited by a moderator: Jan 24, 2020
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  4. Jan 21, 2020 #34

    AfterBurners

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    LOL I guess?
     
  5. Jan 21, 2020 #35

    Voyager1

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    Thanks for your tolerance! It’s not stupid when you have experienced it. It was with QT, as I’ve never used BT. I should add that it was a long 54 mm body tube for a dual deploy hybrid - about 2 m long.
     
    Last edited by a moderator: Jan 24, 2020
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  6. Jan 22, 2020 #36

    Voyager1

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    It’s not getting soft that’s the issue - it’s thermal expansion of the sunny side. It is possible with a long narrow diameter QT tube (54 mm x 2+ m). It didn’t occur in a fibreglass body of the same dimensions. This is from personal experience, not made up. It probably wouldn’t be noticed in a 4” diameter body of the same length.
     
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  7. Jan 22, 2020 #37

    MikeyDSlagle

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    LOL..
    Rail buttons are better!? What?? And red is better than blue. Make sense? No.
    Not everyone shares your enthusiasm for QT or linear rail guides!? Who gives a rat's aft portion what other people like?
    Won't hold up at Mach? They know that, they tell you that, it's no secret.
    Holy Cow!

    It looks like you, @AfterBurners, should probably step back and reevaluate some of your life choices because a large percentage of experienced people don't like what you like.

    Wow..just..Wow.
     
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  8. Jan 22, 2020 #38

    AfterBurners

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    No kidding right?!! LOL
     
  9. Jan 22, 2020 #39

    CoyoteNumber2

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    Well that escalated quickly.
     
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  10. Jan 22, 2020 #40

    Brian Ditmer

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    I'm right, and you're wrong! and even if I'm wrong...well you're "wronger"
     
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  11. Jan 22, 2020 #41

    AfterBurners

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    I have better things to do than argue with certain people on this thread. I was simply making a point that I enjoy the QT that PML offers that's all. I wasn't trying say its better than one material or another, but a nice compromise to card board and wood and it's easier to work with. We all know that. Anyway you guys have a great day!
     
  12. Jan 22, 2020 #42

    n3tjm

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    Many people mentioned the problems with QT and cold weather. I just want to mention the reverse, Ive seen QT deform in direct sunlight. So if you are out on the field, and you have your rockets lying down on a tarp, be wary of that.
     
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  13. Jan 23, 2020 #43

    John Williams

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    Qt certainly has limitations but also it has its place in the world. When I was a teenager trying to break my way into high power rockets before I could afford fiberglass kits which by the way have gotten a ton cheaper since 2004 it was a great way to build bigger kits stronger than paper tubes but not as expensive as fiberglass. To that point j flew a PML endeavour for my level 2 cert on a j250 at Midwest power in November it was 35 degrees outside and my endeavour was built in 2003. That same day I flew my explorer to get my level 1 certification. I also flew my 1/4 scale patriot twice that day all of these rockets were built in 2003. Certainly qt has limits but they let also give more people access to rocketry especially kids
     

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  14. Jan 23, 2020 #44

    Steve Shannon

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    I confess: I like quantum tube for some rockets. And I’ve flown it past mach. It can be done. Be particularly careful with preparation for epoxy.
     
  15. Jan 23, 2020 #45

    John Williams

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    I have reinforced my qt rocket with a phenolic coupler and I'm gonna try to fly it on an L850 in February
     

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  16. Jan 23, 2020 #46

    Steve Shannon

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    The worst failure I’ve had with a QT rocket was at LDRS 27. I flew a Sudden Rush on a K2045. At burnout the phenolic coupler broke, causing the chute to come out into the airstream. That blew all the panels out of the chute. The QT, fins, fin attachments, and everything else other than the coupler and chute were undamaged. But the coupler failure was almost certainly contributed by the airframe flexibility as well as phenolic’s brittle nature. If I could find a g10 coupler to replace the phenolic coupler that’s how I’d build a rocket like yours.
     
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  17. Jan 25, 2020 #47

    Lukun7

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    Wait,what is Quantum Tubing? And why is it good?
     
  18. Jan 25, 2020 #48

    Arsenal78

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    This is PML’s Mini BBX with quantum tubing and fiberglass fins. JB Weld PlasticBonder is easily the best glue for it. 7698E04D-C059-481D-AA33-61C3510A57FE.jpeg
     
  19. Jan 25, 2020 #49

    Nytrunner

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