jurgencamps

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Posts posted by jurgencamps

  2. LeeroyJenkins

    ***I just had one of those cutaways ... I was also thinking to get small before cutting away just so it woud be easier to kil the momentum.



    Tracking is the best way to get out of a flat spin.
    [:/] After a cutaway?

    More skydivers died because they pulled their reserve to late.

    Pull the reserve, deal with the linetwist (if necessery) afterwards.

  3. Westerly


    Anyway, here is a video of some of the openings. On all the jumps I threw the PC at 4000' (had my hand on it and pulled it right as the Viso said 4.00). Both the Viso and AAD reported deployment altitudes around 3200' and I was around 2800 - 3000' by the time the slider came down. However, that's impossible as if you count the frames in the video, the entire deployment process takes 5 seconds or less on every deployment. So on one hand I have the Viso and AAD which very dependably report very similar deployment altitudes on ever jump and on the other hand we have basic math which says a 5 second opening cannot take 1000' to open--it's impossible unless I was doing 190 MPH+ when I opened (which I wasent).


    Do not underestimate the time between "seeing" 4000 ft at the altimeter," tossing" the pilot chute and having an open container.
    You see an open canopy, the altimeter detects an airspeed below a certain threshold. These two actions do not happen at the same moment.
    Just after the opening, the canopy is flying and descending faster than normal and is still slowing down.
    You are using different start and endpoints to calculate or to measure the opening.

  4. tikl68

    … First off like oblextimm stated, communication with in a group going to altitude in the same plane is NEVER a bad thing, its actually encouraged at my home dz, and usually done in the loading area prior to loading the plane.


    Good advice
    tikl68

    The comment was something to the effect of telling unlicensed/student jumper to pull high(which is ok and not against our rules but usually asked to exit after the free fliers and let the people after you know), …


    Why should he jump after the free fliers? Very often the "higher puller" does not open as high as they think. If one of the free fliers who jumps before him, opens higher (intentionally or not), you will now have the risk of collision.
    tikl68

    … but combined with the other component of the situation he was told to follow out a RW group right after with out telling them. If he does not give enough separation time then he will be joining that groups jump with out them knowing, and that in itself is dangerous, not to mention in typical exit order it is belly fliers first then free fliers etc. ..


    He should respect the normal exit separation. He is a solo belly flier, so he should go after the group of belly fliers and use the normal exit separation.
    tikl68

    So if he opens at 4500 there just might be a free flier, or a video guy for a tandem that can check his gear for him as they go screaming by that will most likely exit after him and probably deploy around 3500. Thats why!!!!! :S


    If they scream by, they did not respect the right exit separation.
    If two tandems both with a cameraman jump after him. Does the second cameraman pulls higher than the first tandem? Do you really believe that???? Same reasoning!!!

    Remark: The exit order belly fliers first, free fliers, AFF, Tandem … is only correct for jumpruns into the wind.

  6. chuckakers

    ***I've been told that's it's the USPA 3rd party insurance is only valid in Europe (outside US?) if you're a US citizen or Green Card holder.



    From uspa.org...

    "USPA members receive third-party liability insurance to include bodily injury and property damage while skydiving at a sanctioned drop zone."


    USPA offers membership without regard to citizenship, and that membership includes benefits without regard to citizenship.

    Hay Chuckakers,
    Do you have your USPA membership card at hand? Please turn it arround and have a look at the backside.

    https://uspa.org/Portals/0/files/INS_ThirdPartyLiabilityOverview.pdf

    Quote

    TERRITORY
    The insurance coverage is applicable (1) within the USA, its territories or possessions; (2)
    worldwide with respect to damage arising out of any activities of any insured member
    permanently living in the USA, its territories possessions or Canada     who is temporarily
    outside the USA, its territories and possessions, or Canada, provided that the original suit
    for damages is brought in the USA or Canada; (3) for foreign members of USPA when
    skydiving in events in the USA or Canada     if the claim is brought in the USA or Canada



    Foreigners are only insured in the USA (its territories or possessions) or Canada.

    For ex. a Belgian skydiver (non-green card resident) jumping in Europe at USPA group affiliated DZ is NOT insured.

  7. pchapman


    The canopy volume measurement (or car trunk) isn't as relevant here as we are discussing canopy area, not volume.


    Just wanted to explain that using a different measuring method can give you a different result. Same analogy applies to measuring the surface.

    In the PIA document, PIA has measured all those canopies using their method. This allows the reader to compare the size of the surface of different brands (or types) of canopies.
    PIA quotes different surfaces for a (same size type) optimum and PDR reserve

  8. Quagmirian

    ***

    Also: PD always has "misnamed" their PDR reserves. They are in fact bigger than what the name suggests.
    An optimum 126 = 126 square feet
    A PDR 126 = 137 square feet.

    Objection! PDs and Optimums are the same size. They're measured in the same way. And no, PD has not misnamed their reserves, they are exactly the size they are labelled, when measured by PD's method.

    And how come that PIA measures different sizes when they use their "standard" measuring method?

    Capture 4.JPG

  9. I do not think that the answer is that simple.

    But how do you / they measure the surface of a canopy?
    http://www.performancedesigns.com/docs/packvol.pdf, I. canopy size


    Compare it with the method used to measure the volume of your car trunk.

    They put balls off x cubic inch in the trunk. If they use bigger or smaller balls, the measured volume of the car trunk changes.

    So do you measure the top or the bottom surface of the canopy? The projected surface on the ground or the curved surface?
    See the attached picture. Which line (distance, length) do you take to calculate the surface of your square? If the canopy is not 100 % square, but elliptical …

    canopy.jpg

  10. tkhayes

    I include it as part of one of my safety talks.... "What size reserve do you have?"

    Now ask everyone about landing that parachute, downwind, no flare, brakes set.....

    Most will cringe

    Now ask them again about what size of a reserve they have and why.... The extra 20-30 sq ft could mean the difference between a broken limb or death

    also effective to ask they why they have an AAD if their reserve is some sub-120 micropatch, since the actual scenario in which you might need it (unconscious) becomes unsurvivable anyway..... save the money and blow it on skydives, cocaine and loose women..... usually get some levity out of that.

    But of course we are all jumping small reserves for the most part so we talk and we are all guilty. Fat bastard that I am, I upsized my reserve at the last gear change but still would be well over 1.5 wing loading



    +1.
    One day I had to land my reserve on a tennis court, surrounded with trees.
    After you have executed your EP, you do not always have a lot of options left to pick your landing spot.

    I have a 150 reserve and a 90 / 120 main.

  11. blueskies85

    Hey all,

    Is the Horizon from PD strictly for wingsuit jumps or can it be used for any and all disciplines? I mainly do tracking jumps but also fun jumps. I like the idea of a low bulk main and the Horizon seems to fit the bill. Will it be good for non wingsuit canopy rides? I want a canopy that will open, deploy on heading and be ok to fly. I don’t want much performance or swoops. Low pack volumes are more beneficial to me.

    Thanks

    Blueskies



    If you read this http://www.performancedesigns.com/docs/Horizon_Flight_Characteristics.pdf, and more specific what they say about landings; you will understand that it is not an easy canopy to land. You can make good landings with the canopy, if you master that art.


    So, I think that the PD Pulse (the successor of the silhouette) is a better choice for you.

  12. http://www.pia.com/piapubs/TSDocuments/TS-104CanopyVolume.pdf

    Just for your information, a 170 canopy brand X or type X can be smaller than another 170 brand Y or type Y. There are several methods to measure a canopy. See the table in the link above for the "real" surface of canopies (all measured according the same method)

    Also: PD always has "misnamed" their PDR reserves. They are in fact bigger than what the name suggests.
    An optimum 126 = 126 square feet
    A PDR 126 = 137 square feet.


    In a presentation "dying for airspeed - Bryan Vacher"
    http://www.skydivemag.com/article/dying-for-airspeed?fwd=1 you can find a table with horizontal and vertical airspeed.

    Know that your airspeed is a combination of the horizontal and vertical airspeed http://www.beterrekenen.nl/afbeeldingen/driehoek_abc.png

    For ex. if a skydiver with an exit weight of 90 kg / 200 pound, downsizes from a 170 to a 150, he (or she) will have + 23 % more kinetic energy when he hits the ground during a no-flare straight-in approach.