dgw

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Everything posted by dgw

  1. dgw
    Back in the day, I did a bit of Jap-slapping. I can tell you from personal experience that the forward breakfall does not work well in a parachute landing. I found it hard not to do one, and to PLF instead when required.
  2. dgw
    There has been brief discussion about closing pins in the thread on horseshoes/PCIT malfunctions. I wondered why curved pins are the length that they are. Why are they not longer? According to: http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=113117#113117 by Mr Booth, the only advantage of the flex pin is it's length. Is there any reason why a longer curved closing pin would not be better than one the current length?
  3. dgw
    Very helpfull. Thanks!
  4. dgw
    Yes, the yellow teflon cable. Thanks for the info - nothing is ever straightforward is it?
  5. dgw
    Any thoughts on using the 'flex' pin arrangement to reduce this possibility? I see them on Tandems, S/L rigs, and I recently heard an older skydiver suggesting to a young free flyer that a flex pin was the way to go for container security.
  6. dgw
    http://www.timesonline.co.uk/tol/life_and_style/men/article4399319.ece
  7. dgw
    Fair enough. I've only got my own pin to compare to the incident pin. Mine is dead straight
  8. dgw
    It appears to me that there are three distinct bends in the pin, visible in the high-res image. I append a .jpeg with them marked. Also, we don't use reserve seals in the UK/Ireland, so this may be a bone question. However, is there any significance to be drawn from the condition of the seal thread? It appears to have failed/separated at one end.
  9. dgw
    I agree. That pin appears to have two permanent bends in it, and appears to have sustained two/three bending events. The 'cable' end where the fingers are appears to have been bent up. The free end appears to have been bent up, and then back down. I would really like to see some his-res close ups of the pin, to see if there are any witness marks that might shed some light on the mechanism of the bendings.
  10. dgw
    Don't fret about being a business major. I am an actual engineer, and I am just waiting for Kallend to hammer my square head into a round hole again..
  11. dgw
    Respectfully, yes.. The line strength is not doubled, but the load it can support is doubled. So, if the load is constant, the line only has half the tension (which is a uniform load). Plus, as another poster pointed out, a 'simple course in statics' would easily show this. The top connectors for the line each share half the load at the base (loop at riser). If you extend the analogy, and consider a canopy rigged from a single looped line, you can see intuitively that the canopy is not supported by the strength of a single line, rather the number of 'looped sections' of line.
  12. dgw
    The answer is 1200, if you are looking at a 'pulley' arrangement - see link below. However, I believe that the way the line is looped at the base may affect the local strength of the line in this region. Personally, I would use two lines. The loop would be subject to friction and wear, if I follow you correctly http://www.google.com/imgres?imgurl=http://www.phys.unsw.edu.au/~jw/graphics/blocks1.GIF&imgrefurl=http://www.phys.unsw.edu.au/~jw/blocks.html&h=360&w=333&sz=4&tbnid=Nmnk-oPh1eMJ::&tbnh=121&tbnw=112&prev=/images%3Fq%3Dpulley%2Bload%2Bdiagram&sa=X&oi=image_result&resnum=1&ct=image&cd=1
  13. dgw
    That one happened to me. Come on the quick release wheels!
  14. dgw
    That is the exact way I learned to flat pack. Always seemed to work okay....
  15. dgw
    General comment: There have been a number of comparisons between reading a digital clock and an analogue clock. In the context of comparing digital versus analog altimeters, there is a significant difference when comparing them to clock faces. An analogue clock face has two hands, and both hands need to be read, and then 'added' in order to derive the current time. An analogue altimeter, on the other hand, has only one hand, and does not require a calculation to derive altitude, so it is fundamentally easier to read than an analogue clock. Digital clocks and digital altimeters don't require the extra work involved in reading an analogue clock face. My view? Horses for courses.....
  16. dgw
    Any chance of getting the cumulative frequency, skewness, kurtosis, mean, mode, median, and standard error/deviation of your skydiving earnings?
  17. dgw
    I'm no rigger, but it looks to me as if the straight section of the pin is sufficiently long to completely straddle the grommet, and I suspect the pin in the image could perform similarly to a straight pin, if it was fully pushed into the closing loop?
  18. dgw
    Was it 'Bigway'? He sorted me out very professionally.
  19. dgw
    Peckerhead, I watched that Youtube production. Thanks for the tip. I digged that performance like a bear digging under an electric fence to eat a juicy camper who's all hot and sweaty and rolled in pepper, and crispy. I don't suppose you know if there is an official release of the 'freak brother' version?
  20. dgw
    Thanks Man - you are legendary.
  21. dgw
    There is a really funky tune on the link below entitled 'heyfreakbrother'. Does any of the old school (or anybody else..) know who the artist is? Have a listen - it's funky! http://freak-brother.com/downloads.html
  22. dgw
    Or these gems...
  23. dgw
    What about this?
  24. dgw

    Need Math help.

    dgw replied to Darius11's topic in The Bonfire

    This paper by Dr Searle has the formulae you need to work out acceleration rates/speeds/times. It utilises the transmission gear ratios, which you can get from the manufacturer. With these formulae, you won't need any gross assumptions... http://www.sae.org/technical/papers/1999-01-0078
  25. dgw
    >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I am forced to agree with your old CCI. Since students instinctively curl up into a fetal position, we might as well teach that during the first jump. At least they can learn something about canopy control .... after they open their eyes. That was pretty much what he said.