Results 1 to 19 of 19

Thread: Attaching parachute to shock cord

  1. #1
    Join Date
    8th June 2012
    Location
    Hamilton, Il
    Posts
    92

    Attaching parachute to shock cord

    Could some of you guy's please post pics of how you attached your chute to your shock cord? TIA
    Fly Safe & Fly High
    TRA #14026
    Robbie

  2. #2
    Join Date
    9th October 2011
    Location
    Boston MA
    Posts
    484
    I suppose it depends upon the type of shock cord. With kevlar and nylon strap, I have had good luck using this loop:

    http://www.animatedknots.com/alpinebutterfly/index.php

    It holds up with stress on the line, and can be untied and moved if needed. I have attached a quick link to a swivel, or in a pinch attached the chute directly to the loop of cord.
    NAR, TRA L2
    Member: CMASS, MMMSC
    "I haven't slept for a week because that would be too long." -Mitch Hedberg

  3. #3
    Join Date
    29th November 2009
    Location
    Fort Collins, CO
    Posts
    526
    I use this know to tie my shock cord in a loop, then use an appropriately sized quick link or delta link.

    http://www.animatedknots.com/bowline...matedknots.com

    Edward

  4. #4
    Join Date
    18th March 2012
    Location
    Oregon City. OR
    Posts
    1,125
    I just tie an overhand loop in the cord, and then attach quick link. Swivel then connects the link in the harness to the parachute lines.
    Have no fear, Chaos is here.
    Dan dan Daaaah
    L1 - RalphCo Crayon H225 -::- L2 - ARR Basic Blues 3" J270
    TRA 13815 - NAR 87999
    Now playing with clusters and staging!

  5. #5
    Join Date
    1st July 2011
    Posts
    1,109
    I use a hangmang's knot since they end up in the trees.

    I just pull a loop, tie an overhand in it (water knot). Attach chute to loop via lark's head.
    Kevin Wuchevich
    Tripoli Pittsburgh
    TRA 12238

  6. #6
    Join Date
    29th December 2011
    Posts
    542
    I'm generally using Kevlar lines, so I tie a bowline knot in the Kevlar. I attach to that with a quick link or swivel, for larger stuff. For smaller stuff, I may directly use the bowline.

    Gerald

  7. #7
    Join Date
    18th January 2009
    Location
    Oviedo, FL
    Posts
    2,472
    Based on a suggestion in a TRF post a while back, I've started attaching the rocket body to the nose cone with a shock cord then connecting the parachute to the nose cone with a separate short shock cord. For larger rockets, it's easier to hook up since none of the connections are in the middle of a shock cord. And, it seems to reduce twisting on the way down since the nose cone is hanging below the parachute in line with the body instead of swinging around.

    -- Roger

  8. #8
    Join Date
    20th January 2011
    Location
    Cache Valley, UT
    Posts
    586
    I'm all about the butterfly knot. Based on experience, I'm also about to be all about the swivel as well! About 10 years ago I sort of got into caving and collected equipment, knowledge, and the book "On Rope One" which I highly recommend to anyone working with cord or webbing. That's where I learned the butterfly and a host of other very useful bends and knots.

  9. #9
    Join Date
    10th November 2011
    Location
    Northeastern Maryland
    Posts
    779
    Depending on the situation I use either a butterfly or figure-8 on cord and a water knot loop on webbing. Just remember that knots that are good in rope are not good in webbing as well as the other way around.
    -James Hamilton
    L2
    https://sites.google.com/site/disasterguysrocketry/
    I love America but I also love Canadian bacon, whiskey, and MOTORS.

  10. #10
    Join Date
    11th March 2009
    Location
    Manhattan Kansas
    Posts
    1,216
    Most of my knots are bowlines. It is probably the most useful knot to learn how to tie for anything.
    TRA #14037 Level 2
    NAR #90851 Level 2

    KD0TPW

    Gosh Darn Good Rocket Day!!!

  11. #11
    Join Date
    18th January 2009
    Location
    Behind enemy lines in Socialist California
    Posts
    3,865
    I'm a big fan of heavy duty swivels and quick links.
    Kit (AKA Cranky Kong)
    Total Total Impulse as BAR: 7,753.69 Ns (Equivalent to a 51% M motor.)

    =| Calirado, Colofornia...what's the diff anymore? |=

  12. #12
    Join Date
    24th January 2009
    Location
    Somewhere, Kuwait
    Posts
    8,349
    I do an overhand loop. It has never failed for me.
    -----------------------
    Chuck Haislip
    NAR/Tripoli Level 3

    Level 1 - LOC Minie Magg; Level 2 - PR Broken Arrow;
    Level 3 - 10 inch Nike Smoke
    Ns for Year: 0 on hiatus serving our GREAT country in Kuwait
    My rockets usually fly naked. If they survive, they earn their paint.

    Come fly with ROSCO or ICBM in Orangeburg SC => http://rocketrysouthcarolina.com

  13. #13
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    7,984
    Quote Originally Posted by cwbullet View Post
    I do an overhand loop. It has never failed for me.
    Same here. Never had a problem.
    NAR 91107, Level 2

    I think paint and I have an uneasy truce going.

  14. #14
    Join Date
    20th January 2011
    Location
    Cache Valley, UT
    Posts
    586
    I wasn't clear in previous posts regarding my use of the butterfly knot. I use that one as a mid-line knot (also known as a Harness loop). For attaching something to the END of the line, I always use an overhand knot. variations of the overhand knot such as the water knot and beer knot are perfectly fine for life-rated applications when using webbing. For creating an endless loop, the water knot is used. Just an overhand knot with the other end of the webbing coming around and following through the knot. I tried the beer knot once... not something you would use in the field but while sitting on the couch it was fun to tie. Makes one heck of an endless loop!

  15. #15
    Join Date
    8th June 2012
    Location
    Hamilton, Il
    Posts
    92
    Thanks for all the help guy's I appreciate it. I am going to give the Butterfly knot a try.
    Fly Safe & Fly High
    TRA #14026
    Robbie

  16. #16
    Join Date
    15th December 2011
    Location
    Too far from the event horizon.
    Posts
    702
    I don't know the name of the knot I use. "Fred," I think, is probably appropriate. I tie Fred, then attach a quick-link to secure Fred to whatever I'm attaching him to. With heavier NC's, I tend to put them about 1/3 from the end of the shock cord, with the 'chute attached at the top.


    Later!

    --Coop
    Build photo diaries on my Facebook page: http://www.facebook.com/geoff.cooper.391 ALL BUILD DIARIES ARE SET FOR PUBLIC VIEW.



    Q: What's the difference between a geek and a nerd?

    A: A nerd has documentation.

  17. #17
    Join Date
    9th March 2012
    Location
    Chicago area, IL
    Posts
    34
    I take all of the lines and do a girth hitch (falsely known as a larks head) on to the shock cord. Its simple and easy to undo, and hasn't failed me with 1/2A-H.

    http://www.animatedknots.com/girth/

    -Jack
    Jack
    KC9RGW
    NAR: 94450
    Jr. L1: 5/20/12 (Now L1)

  18. #18
    Join Date
    1st July 2011
    Posts
    1,109
    Quote Originally Posted by Johnhg7 View Post
    I take all of the lines and do a girth hitch (falsely known as a larks head) on to the shock cord. Its simple and easy to undo, and hasn't failed me with 1/2A-H.

    http://www.animatedknots.com/girth/

    -Jack
    My Boy Scout handbook was wrong? Disappointed.
    Kevin Wuchevich
    Tripoli Pittsburgh
    TRA 12238

  19. #19
    Join Date
    19th January 2009
    Location
    Washington D.C.
    Posts
    3,612
    Best knot I've found for attaching Chutes or Streamers in-line on Elastic or anyother Shockline material including kevlar is the Butterfly Knot.
    Hope the tying illistration is of help.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ButterFly Knot-sm_4pic tutorial_07-20-05.jpg 
Views:	62 
Size:	118.9 KB 
ID:	94495   Click image for larger version. 

Name:	Shock-Cord Mount-h2_Retro mount 6pic pg2of2_09-28-06.jpg 
Views:	60 
Size:	172.4 KB 
ID:	94496  
    Keep em Flyin Micronzied
    John
    Mrcluster/Micromeister
    Nar-15731
    Co-moderator MicroMaxRockets yahoo group.
    http://groups.yahoo.com/group/MicroMaxRockets/

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •