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  1. #1
    Join Date
    20th August 2014
    Location
    Montreal
    Posts
    77

    Deployment problems on Giant Leap Rocketry's Vertical Assault

    *Disclaimer: not GLR's fault*

    This summer, I flew to try to get my L3 (Canadian L3). The going up part of the flight was good, but coming down, the main parachute got stuck in the body. Anyways, the rocket was undamaged but the failure to deploy lost me the L3. In the end, only my pride was hurt. Here's a video of the launch just for fun:

    https://www.facebook.com/neil.woodco...0966164736116/

    The main parachute had been a bit of a snug fit on the ground, but I was able to pull it out easily enough to make me confident it would work in flight. The main in this case is a 48 inch nylon parachute. Post flight, I noticed 2 things:

    1. The folded parachute had rolled on its side and had become jammed at the mouth of the body tube
    2. The kevlar parachute protector, which was already full of pyrodex residue from previous tests, felt sticky to the touch and had a pretty high friction coefficient with the FG body tube


    Based on these observations I have come up with some possible solutions. Of course, I'm looking for feedback from the experienced people on this very forum.

    1. Try a new folding technique. Preferrably one that folds the parachute into a longer, slimmer package. As well, the shockcord may need to be folded better, as it looks like it had a role in jamming the parachute in the tube
    2. Get a smaller parachute. If it landed fine with only a drogue, who says it needs a parachute as big as 48 inches?
    3. Clean the kevlar parachute protector between flights. I've already done this
    4. Maybe wrap the parachute and protector in a sabot of some kind. Cardstock might work.


    Any help is appreciated!

    Last edited by Neilw; 11th January 2017 at 05:47 PM.
    Chief Designer of the Aurelius - Won 2nd Place, 2016 IREC Basic Category
    Chief Designer of the Arcturus - Won 2nd Place, SDL Payload Challenge, 2015 IREC

    "Don't worry 'bout it!" - Space Concordia
    "A new rocket is pretty, but a flown rocket has character!" - Handeman

  2. #2
    Join Date
    5th December 2013
    Location
    MD
    Posts
    5,089
    Things I would do:
    1. Z-fold your harness
    2. More BP
    3. Smaller chute (with that premade fin can, you can take a harder landing, like you said)
    4. Don't be afraid to wash your chute protector and harness (but don't do it with another load of laundry or the clothes might turn gray)

    John S. ---- NAR #96911 ---- TRA #15253 ---- MDRA #067 ---- BARC #028
    L1, 3/15/14: Aerotech Sumo, CTI H133BS
    L2, 6/21/14: Giant Leap Vertical Assault, CTI J240RL
    L3, 3/12/16: MAC Performance Radial Flyer, CTI M1101WH
    Altitude: 13,028', L3 flight; Speed: Mach ???, L3 flight

  3. #3
    Join Date
    27th May 2015
    Location
    Charleston, SC
    Posts
    75
    1+ Bat-mites suggestions. Also ground test, ground test after performing steps 1 to 3 above.
    Good Luck!!

    Fred,
    L2, ROSCO member
    KG4YGP

  4. #4
    Join Date
    20th August 2014
    Location
    Montreal
    Posts
    77
    Quote Originally Posted by Bat-mite View Post
    Things I would do:
    1. Z-fold your harness
    2. More BP
    3. Smaller chute (with that premade fin can, you can take a harder landing, like you said)
    4. Don't be afraid to wash your chute protector and harness (but don't do it with another load of laundry or the clothes might turn gray)
    I did a z-fold, but that may have been part of the problem. It was still jammed up in the body with the tape intact. Maybe I should try a weaker tape? I was using white masking tape but maybe I should have gone with green.

    Quote Originally Posted by FMarvinS View Post
    1+ Bat-mites suggestions. Also ground test, ground test after performing steps 1 to 3 above.
    Good Luck!!
    I'll try to get some testing time. It gets a bit hard to test for me, though, since I live in the city.
    Chief Designer of the Aurelius - Won 2nd Place, 2016 IREC Basic Category
    Chief Designer of the Arcturus - Won 2nd Place, SDL Payload Challenge, 2015 IREC

    "Don't worry 'bout it!" - Space Concordia
    "A new rocket is pretty, but a flown rocket has character!" - Handeman

  5. #5
    Join Date
    5th December 2013
    Location
    MD
    Posts
    5,089
    Regarding ground testing, if you don't do it, then you take what you get at the field. If your rocket crashes, you could be out significant $$$. If it works on the ground, it will work in the air.
    John S. ---- NAR #96911 ---- TRA #15253 ---- MDRA #067 ---- BARC #028
    L1, 3/15/14: Aerotech Sumo, CTI H133BS
    L2, 6/21/14: Giant Leap Vertical Assault, CTI J240RL
    L3, 3/12/16: MAC Performance Radial Flyer, CTI M1101WH
    Altitude: 13,028', L3 flight; Speed: Mach ???, L3 flight

  6. #6
    Join Date
    2nd September 2010
    Posts
    2,452
    I keep a bottle of baby powder in my chute box. Makes stuff slide a lot better. Put a gob in the chute when you pack it for better visibility when it pops opens.

    NAR#91770 level 2
    TRA#13995 level 2

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