accumack

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Jump Profile

  • License
    D
  • License Number
    4825
  • Licensing Organization
    uspa
  • Number of Jumps
    2500
  • Years in Sport
    51

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  1. Sky Diving is dangerous and has been since the beginning! However there are things you can do to lessen the danger.
  2. accumack

     Dave Dewolf

    A giant in this sport! R.I.P. Dave say hi to Joe Smith!
  3. When I worked at Para-Flite we did lots of work with domed sliders and also lipped sliders. As a matter of fact we used them on our cargo delivery systems in the mid to late1970s up until the time I left in 1995. Now having lines dump due to bad rubber bands this can cause an out of sequence opening and no slider will prevent that. If the canopy is out of the bag before line stretch it can spread. Without tension on the lines the slider cannot contain/restrict the opening as the canopy has started to inflate. Domed sliders can increase the snatch force create a spike in felt opening shock. I had many instrumented jumps measuring g forces some with very low g forces felt harder than much higher g force openings due to the length of time the forces were occurring. Out of sequence opening can kill or injure.
  4. accumack

    Built in turns

    It sounds like a cheap ass company! When I worked at Para-Flite it didn't matter if you were the original owner or not. We fixed the canopy. I guess it's still a trade secret on making sure a canopy doesn't turn. It isn't just bias in the fabric.
  5. accumack

    Skylark new Odyssey EVO parachute

    This funny Para-Flite Inc used the Evolution & Evo name back in 1989 through 1995.
  6. accumack

    Why dont reserve PCs have limiter tapes?

    If you had a center line on a spring loaded pilot chute it could limit the jump/ launch of the pilot chute.
  7. accumack

    My little project

    Looks good Quagmiran.
  8. accumack

    1ST 100 way . When / Where

    If 1979 36 way was at the Nationals then it was Richmond, Indiana.
  9. accumack

    Do Canopies Naturally Turn Upwind?

    Having done hundreds of test drop when I worked for Para-Flite here's my take on it. Most dummy landings were more or less down wind. Most test drops are done from a side door of an aircraft so the dummy and canopy are facing perpendicular the jump/drop run. Due to the forward throw of the aircraft the deployment happens mostly horizontally. As the forward throw is dissipated it becomes vertical. The initial inflation one side of the canopy is higher as the dummy becomes vertical the side that is higher sees a slightly higher load/ airspeed as the dummy swings under the canopy causing the canopy to turn in a down jump/drop run direction. In the few times the canopy opened facing directly up or down the jump/drop run the canopy continued fly in that direction no turn. This just MY EDUCATED OBSERVATION from many years of drops with no scientific proof. Parachutes don’t care which way the wind blows but gravity has an influence.
  10. accumack

    Open letter to all DZO's

    Not a Poter as the video says. Landing gear, door and other differences.
  11. accumack

    Direct Line Attachment vs. Flares

    Some of Para-Flite's Strato Flyers had only 1 vertical tape prior to D'jango. During the trial Snyder presented the single vertical tape as part of the copying and patent infringement case.
  12. Sorry to hear this. He was a good guy i remember him jumping a monstrous B&W video system he videoed our 8 way team exit at Lakewood paracenter in New Jersey when we were practicing for the Z-Hillz turkey meet in the late 1970s.He was shooting video of a team from Pelicanland.
  13. accumack

    DIY Harness/Container

    Unless you are willing to spend the money to TSO do not expect to jump it in the U.S.A. Don't know about other countries.
  14. accumack

    I really cant pack parachute

    Practice makes perfect. Practice during the week. Ask experienced packers for tips.