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  1. #1
    Join Date
    11th April 2016
    Posts
    57

    Rocket powered vertical launch sled? Air start?

    Launch pad that has its own propulsion system to kick the rocket off the pad at a stable velocity, then air start the motor at 100-200 feet.Has it been done?I was thinking a competition system that uses 4 rods and an elevator that shoots to the top and stops. Momentum carries the rocket up until the predetermined height for aux ignition.I imagine this could work nicely if constructed strong enough. I suppose you could use pneumatic pressure to launch the sled as well.Comments?


  2. #2
    Join Date
    7th August 2014
    Posts
    288
    Do you mean a piston launcher? Or do you mean a launcher like what the military uses?

    BuiltFromTrash
    First RMS Flight: June-17 2015
    Pringles Can Rocket
    G53-FJ-7 (29-40/120) 92 Newton-Seconds
    ~1300 Ft

  3. #3
    Join Date
    11th April 2016
    Posts
    57
    Elaborated a bit.

    The rocket sits snug on the pad. All set for air start at 200 feet. There are no lugs, it just sits nice in a cradle of sorts.

    Press the launch button and bam! all four G80Ts light up under the pad shooting said cradle blasting off to the top of the launch system.

    When the cradle reaches the top of the system, it stops and the rocket keeps going. Fast enough for stable flight.

    At 200 feet, the main motor kicks in and blasts it even faster/higher.

    not the proper use of motors I get it, which is why I thought pneumatic pressure to propel the sled upwards to the top of the rails.

    Like circus acrobats on a see saw.

  4. #4
    Join Date
    18th January 2009
    Location
    SW Michigan
    Posts
    3,724
    Erm...This sounds bizarre. Is there a specific objective you hope to achieve or is this "I wanna do it cause it's cool" thing?

    My first impression is why not just make a 2 stage rocket instead which will have the same (sort of?) result but easier to execute. Otherwise, I think trying to keep the pad pointed upward is going to be a but of an issue...
    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

  5. #5
    Join Date
    19th January 2009
    Location
    Stafford VA
    Posts
    6,653
    I think it would be a cool machine, but kind of like a Rube Goldberg thing. Very complicated and prone to bad outcomes in relation to any benefit.

    But, if you build it, they will come!
    Handeman

    TRA #09903 L3 3/29/2015

    "If you don't use your head, you have to use your feet!" my Dad

    Tripoli Central Virginia #25 - BattlePark.org

  6. #6
    Join Date
    15th October 2016
    Location
    Huntsville AL
    Posts
    695
    A STEM highschool IREC team built a system that used 2 I motors to accelerate their liquid rocket to a stable speed (lower thrust from the liquid engine).
    They ended up aborting during countdown though

    This is sounds like your idea upscaled.

    "I'm at least 70% confident about whatever I say (90% of the time)"- college me

    NAR 101195
    Level 1: Big SAM, 9/10/16

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