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Thread: Hybrids 2017

  1. #121
    Join Date
    20th January 2009
    Posts
    659
    2 minute sounds about right for my Contrail M +/-20 seconds or so. ALWAYS seems a lot longer when you are filling.

    Mike K

    Quote Originally Posted by G_T View Post
    What is a typical fill time for the long Contrail M tank? My valved system in THRP-1 ended up right at 2 minutes (from memory; I could verify if necessary). Tank volume is similar but since mine is a chilled system it holds more mass. I'm curious how the fill time compares to Contrail's vented method?

    Gerald


  2. #122
    Join Date
    20th January 2009
    Posts
    659
    Getting ready for ROCstock next weekend at Lucerne, for hybrids I have;

    Contrail M
    Skyripper J
    RATT J
    RATT I

    And possibly a RATT K

    anyone bringing up hybrids?

    Mike K


  3. #123
    Join Date
    30th January 2009
    Posts
    326
    Quote Originally Posted by kramer714 View Post
    Getting ready for ROCstock next weekend at Lucerne, for hybrids I have;

    Contrail M
    Skyripper J
    RATT J
    RATT I

    And possibly a RATT K

    anyone bringing up hybrids?

    Mike K
    I'm going to have to sit this one out (busy getting ready to launch something slightly bigger if you know what I mean.) Maybe in November.

  4. #124
    Join Date
    20th January 2009
    Posts
    659
    Quote Originally Posted by CoyoteNumber2 View Post
    I'm going to have to sit this one out (busy getting ready to launch something slightly bigger if you know what I mean.) Maybe in November.
    ROCstock got blown out by the wind, I do plan to try again for hybrids in July (weather permitting),

    Mike K

  5. #125
    Join Date
    30th July 2014
    Location
    Lapeer, MI
    Posts
    412
    Flew some skyripper clones today, in a spool fitted with a chute realease. Taped a pool noodle to the top to help protect the case. Works great !

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  6. #126
    Join Date
    19th January 2009
    Posts
    890
    Heh... Never considered using a chute release that way. I might have to try it.

  7. #127
    Join Date
    30th January 2016
    Location
    US > OK > NE
    Posts
    2,974
    Quote Originally Posted by Danh View Post
    Click image for larger version. 

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    This is top-hole madness, fantastic.

  8. #128
    Join Date
    30th July 2014
    Location
    Lapeer, MI
    Posts
    412
    Quote Originally Posted by dhbarr View Post
    This is top-hole madness, fantastic.
    If the winds are favorable next month going to put it up with the j-144. I have a few grains leftover...

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  9. #129
    Join Date
    29th November 2009
    Location
    Fort Collins, CO
    Posts
    1,129
    I've been working quite a bit this summer on tribrids. After quite a few tests with a RattWorks clone I found out that if you size the nitrous and alcohol orifices a certain way you can get a condition where you get choked flow through them. This produces a nice nearly flat (< 2.5% difference from start to end) thrust curve until you run out of liquid nitrous oxide and go into blowdown phase. After I figured out the sizing of the orifices then I worked on using pressure regulation on the nitrous oxide flight tank so that the motor always starts at the same pressure and density. I've probably done 15 tests this summer and about to scale the motor up to a 4-inch size. I've also made some changes to the injector design on the RattWorks so that it doesn't rely on bursting a small inner tube and the motor starts almost instantly in nitrous/alcohol mode. Overall, I'm much more impressed with the tribrids because of the small combustion chamber and ease of scaling impulse up. More impulse, longer tanks. I hate to say but with less variables to deal with I'm not as excited to go back to hybrids because you have to figure out regression rate, insulation, surface area etc. With the tribrid you set those values and can count on them.

    Edward

  10. #130
    Join Date
    29th December 2011
    Posts
    1,699
    Very good!

    So far, I've yet to obtain any nitrous (suppliers don't seem to be taking new customers around here due to the shortage), and haven't arranged for a test, so I'm sitting dead in the water at the moment. That's my status.

    Gerald

  11. #131
    Join Date
    29th November 2009
    Location
    Fort Collins, CO
    Posts
    1,129
    Bummer about not getting any nitrous! I've went through five 75 pound bottles since the start of June this year. A nitrous surcharge did show up on my invoices, though it was small - $10.

    Edward

  12. #132
    Join Date
    18th January 2009
    Location
    ALABAMA
    Posts
    3,374
    Quote Originally Posted by Danh View Post
    If the winds are favorable next month going to put it up with the j-144. I have a few grains leftover...

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    Saw your post in the classifieds; I hope that you were able to get some flight time before losing the motor...
    "He who fights with monsters should look to it that he himself does not become a monster, and if you look long into an abyss, the abyss also looks into you." - Friedrich Nietzsche

    "The Future is Not Solid" - Korey Kline

    TRA# 08705 L3

  13. #133
    Join Date
    30th July 2014
    Location
    Lapeer, MI
    Posts
    412
    yes i did get my flight in. here is a spool on a j-144. i loaned my hardware right after this flight.

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  14. #134
    Join Date
    18th January 2009
    Location
    ALABAMA
    Posts
    3,374
    Interesting, in 2008 I flew a J144 once...and only once! The recovery eyelet came unscrewed from the motor bulkhead, and the booster came in hot never to be seen again.
    Last edited by DRAGON64; 30th August 2017 at 03:00 PM.
    "He who fights with monsters should look to it that he himself does not become a monster, and if you look long into an abyss, the abyss also looks into you." - Friedrich Nietzsche

    "The Future is Not Solid" - Korey Kline

    TRA# 08705 L3

  15. #135
    Join Date
    18th January 2009
    Location
    SW Michigan
    Posts
    3,828
    Quote Originally Posted by Danh View Post
    yes i did get my flight in. here is a spool on a j-144. i loaned my hardware right after this flight.

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    You have managed to peg my "ARE YOU F*(&*(* KIDDING ME?" meter.


    Dave Brunsting | NAR 85879 | TRA 12369
    L1 - 11/04/07, Three Oaks, MI | L2 - 7/25/09, Muskegon, MI
    Michiana Rocketry
    Notre Dame Rocket Team Mentor

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