Head-End Dual Deployment Details & Explanations Requested

Discussion in 'Recovery' started by Viperfixr, Oct 19, 2015.

Help Support The Rocketry Forum by donating:

  1. Jul 2, 2019 #61

    Bat-mite

    Bat-mite

    Bat-mite

    Rocketeer in MD

    Joined:
    Dec 5, 2013
    Messages:
    10,534
    Likes Received:
    1,349
    Gender:
    Male
    Location:
    Maryland
    Most people will poo-poo this, but on my Formula 75, I epoxied the harness to the inside of the NC. It has held up for 5 or 6 flights so far and shows no sign of wear.
     
    Tim51 likes this.
  2. Jul 2, 2019 #62

    hobie1dog

    hobie1dog

    hobie1dog

    Hi-Fi Nut

    Joined:
    Jul 26, 2009
    Messages:
    2,065
    Likes Received:
    59
    Gender:
    Male
    Location:
    Cornelius, NC
    Great thread, thanks for the pictures.
     
  3. Jul 2, 2019 #63

    Tim51

    Tim51

    Tim51

    Well-Known Member

    Joined:
    Jul 4, 2015
    Messages:
    785
    Likes Received:
    102
    Gender:
    Male
    Location:
    London, United Kingdom
    Thanks - good to know. If it works on a F75, it'll work on the project I have in mind.. [emoji1]
     
  4. Jul 2, 2019 #64

    blackjack2564

    blackjack2564

    blackjack2564

    Crazy Jim's Gone Banana's

    Joined:
    Jan 18, 2009
    Messages:
    8,906
    Likes Received:
    1,022
    Location:
    Savannah Ga
    Think outside the box...we don't need no stink'n E-bolt..lol just a loop!
    When building rockets you must come up with all types of strange solutions...lol:cool:

    On lightweight plastic cones..[all of them lol] I make a loop of 1/4 kevlar [or anything] tie it together with your favorite knot, I just use an overhand.
    Slip a washer and 1/4 inch nut over kevlar and slide down to the knot.
    Scuff up inside tip with screwdriver or end of file.
    Drop it in NC and foam the tip 3-4 inches . 2 part urethane foam [wildman sells it.PML sell it etc.]
    NC being plastic and foam can create heat, put it in water to keep from deforming.
    This one was in the instructions for wildman Sport, which was single deploy so I didn't care how much was used.Obviously you need less and need room for chute in HED.

    Size glass to cone and I fill with ice/water. Trust me foam STICKS to anything and stays put!

    DSCN3371.jpg DSCN3372.jpg DSCN3378.jpg DSCN3395.jpg DSCN3396.jpg
     
  5. Jul 3, 2019 #65

    Bat-mite

    Bat-mite

    Bat-mite

    Rocketeer in MD

    Joined:
    Dec 5, 2013
    Messages:
    10,534
    Likes Received:
    1,349
    Gender:
    Male
    Location:
    Maryland
    Wow, Jim, that's one I would not have thought of. I guess the only catch is to make sure you still have enough room for the chute after the foam is in.
     
  6. Nov 5, 2019 #66

    Tim51

    Tim51

    Tim51

    Well-Known Member

    Joined:
    Jul 4, 2015
    Messages:
    785
    Likes Received:
    102
    Gender:
    Male
    Location:
    London, United Kingdom
    Finally got round to flying a (sorta) DIY HED arrangement over the weekend. I picked up an old second hand gelcoat 4" NC a while ago. The interior was too rough and uneven to allow a smooth fit of the Av coupler, so rather than saw the NC shoulder off I made a short 'collar' from a length of aiframe, so the shoulder of the NC butted up to the forward bulkplate of the Av bay. I used an existing Av bay and a 4" booster from two different earlier projects. So slight adjustments but the basic principle was the same - main chute packed in NC. Cloud base was pretty low so I flew it on an I345 - Dual deploy wasn't really necessary given the altitude (SLCF said 1983') but it was a nice little low 'n' slow try out..
    Flight picture courtesy H.A.R.T. Rockets

    First HED Flight.jpg
    First HED recovery 3_11_19.jpg
     
    Last edited: Nov 5, 2019
    Serac likes this.
  7. Nov 13, 2019 #67

    blackjack2564

    blackjack2564

    blackjack2564

    Crazy Jim's Gone Banana's

    Joined:
    Jan 18, 2009
    Messages:
    8,906
    Likes Received:
    1,022
    Location:
    Savannah Ga
    Glad it worked out good for ya Tim! Thinking outside the box works wonders.
     
    Tim51 likes this.
  8. Dec 4, 2019 #68

    Serac

    Serac

    Serac

    Well-Known Member

    Joined:
    Aug 6, 2019
    Messages:
    47
    Likes Received:
    11
    Location:
    Tucson, Arizona
    The more l look at this approach, the more I like it. Is there any reason why this isn't the default/preferred DD approach? The complication of mounting the shock chord to the NC?
     
  9. Dec 5, 2019 #69

    blackjack2564

    blackjack2564

    blackjack2564

    Crazy Jim's Gone Banana's

    Joined:
    Jan 18, 2009
    Messages:
    8,906
    Likes Received:
    1,022
    Location:
    Savannah Ga
    It works fantastic for shorter scale rockets where no room or high performance where every inch counts.
    But also needs good packing skills.
    Most just prefer a large bay for chutes and sport flying...there are as many reasons as there are fliers...lol
    You find several kits now with HED [head end reply] out there, Wildman Jarts...Punishers..and several more.
    Fiberglass spiral wound cones are easy conversion, since couple/shoulder can be converted to av-bay by just adding a vent band....easy peasy .

    The issue I was addressing was converting plastic cones with built in shoulder, which has it's own complications,but you are right it saves weight...higher flights...better performance.:cool:
     
    Serac likes this.

Share This Page

Group Builder