Periapt

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Jump Profile

  • License
    D
  • License Number
    3017
  • Licensing Organization
    USPA
  • Number of Jumps
    1190
  • Years in Sport
    41
  1. Periapt

    Acetabulum (Left hip joint) fracture

    Weight is an important factor in general health and, in this case, likelyhood of active sports-related injuries, especially in those with prior injures and/or prosthetics. What constitues a safe/healthy weight varies from individual to individual. General guidelines can be found at: http://www.calculator.net/weight-loss-calculator.html
  2. Periapt

    NOT releasing brakes in an emergency?

    #3 is one of the soundest pieces of advice re. reserve canopies I have seen. I know there are those who want the smallest, lightest rigs possible, but to assume that you will always be fully functional and able make a perfect landing in an emergency situation is folly. No reserve can guarantee you an injury-free landing, but being prepared for the worst case scenario by having generous safety margins seems eminently sensible. Also, #4 seems worthwhile advice, unless you are truely invincible and immortal.
  3. Periapt

    Dislocated shoulder

    What about these: Ligaments of the AC joint: Capsular; superior and inferior acromioclavicular; articular disk; coracoclavicular (trapezoid and conoid) Ligaments of the Sternoclavicular joint: Capsular; anterior and posterior sternoclavicular; inter- and costo- clavicular; articular disk Ligaments of the GH joint: Capsular; coracohumeral; glenohumeral; transverse humeral; glenoid of humerus Are they just for decoration? Touche' I was thinking of the stabilization of the humeral head at the highly mobile glenohumeral joint. The capsular ligaments are integral parts of the joint capsule which must allow for the great freedom of movement that the shoulder has. These can be torn when there is a dislocation. The others mentioned are certainly part of the shoulder girdle and are less compliant and more like the ligaments of other joints. My apologies and thanks for pointing out my lack of precision. RGJ.
  4. Periapt

    Gopro-make it safer

    So many people jump with the provided gopro mount and often without a cutaway... They can't all be wrong! [/sarcasm] I realize this isn't strictly on topic, but can you imagine filming with this?
  5. Periapt

    Dislocated shoulder

    Strictly speaking, there are no ligaments holding the shoulder in place. The head of the humerus is held in place in the glenoid fossa of the scapula (shoulder blade) by the muscles and tendons of the rotator cuff. Ligaments that hold joints together connect bones to bones with no intervening muscle tissue. The bloke from Australia took quite a risk taking the brakes off his reserve. If he could only get one brake unstowed he would have spiraled in. The same thing could also have happened if he was unable to flare symmetrically. Good for him that he made it work.
  6. Periapt

    Converging canopy traffic

    Is #2 an international standard or is it only USPA/North America? It would be good if so. Imagine how interesting it could get at an international get together if jumpers from countries that drive on the left also turned left to avoid the collision.
  7. perhaps the better question would be does anyone know of a malfunction or incident that could be attributed to the hood on any garment. based on the current replies, it would appear that the answer is "No". Of course that does not mean it's not possible. as a practical manner, if someone wants the hood over their head, they should probably put some kind of helmet over it so it doesn't blow off.
  8. Periapt

    Question for military riggers

    this is the link to the Aussie RAC http://hq.apf.asn.au/index.php/RAC501A I've seen it. The problem I have with the blast handle issue is that there were incident reports, but was there any serious investigation of the problem? Were there inherent problems in the blast handle itself, or were the issues related to manner in which it was used and rigged on sport parachute systems? If you don't know the real nature of the problem, how can you remedy it? The easy way is to just make the problem go away by summary judgement. But if the easy way out becomes the habitual first choice, as it can easily do, you will end up creating more problems than you solve.
  9. Periapt

    Question for military riggers

    [replyPoynter I says that the USPA banned blast handles in 1968. 1968? I bought my rig in the 70's jumped it in 10-man speedstar competition at the 1973 nationals. I expect they are still banned and will be forever, so this thread is, at best, academic.
  10. Periapt

    Round Parachute Reserve Question

    Good one........ oh... was there a parachute in that clip? . I believe it's a Security Crossbow piggyback :) With a flat circular canopy and a T-U cut in it, or possibly it's a LoPo manufactured with the mod. Nice demo of packing a round, but I guess they don't make packers like they used to...(Sigh!)
  11. Periapt

    Question for military riggers

    Thank you for the info and the pics. This, indeed is indeed the componint I was inquiring about. The rig I had was a crossbow piggyback with a cut-down main container. It had blast handles on both main and reserve, both of which had guide nobs in place. As per the custom of the time, the post was drilled out of the reserve handle, but this, uncustomarily, was not done on the main handle. It is noteworthy that I NEVER had any difficulty pulling the main (undrilled post and all). It was reported that pulls not in-line with the ripcord housing could cause the handle to hang-up. I also know that the knob-guides were rarely seen on sport rigs. My suspicion is that the knob-guide effectively added a lever arm that stuck out from the fist when pulling and twisted the handle so it was inline with the end of the ripcord housing, even if the pull was off-axis. Based on this, I must conclude that a guide nob was necessary for optimal function and should have been used on all blast handle ripcords, main or reserve. As I posted elsewhere, I really liked the blast handles. They were always where you expected them to be and they were less likely to snag on something. It is a shame that they have been banned.
  12. Periapt

    Question for military riggers

    Which services had emergency parachutes that used the Wind Blast handles? What was the terminology for the cylindrical sleeve that was attached over the end of the ripcord housing, covering the clips that held the handle in place.. These were, as I recall from a sport rig I owned, about 2" in length and were held in place by a setscrew. If you have any images, they would be appreciated. Thanks, D-3017
  13. Periapt

    Blunt object strikes

    How much force is "high force"? How blunt is a "blunt object". What if impact was a glancing blow? What if the object had some "give" to it instead of being rock hard? What if you didn't directly see the impact? What if you're wrong about judging how fast and how hard they hit? What if you're wrong about there being no pulse? If your pup, which you love, suffered such an accident, would you do nothing to try and save him? It doesn't hurt to try. This has been an interesting thread, largely because both sides have made good points. FlyingPortagee is partially correct in saying that that a pulseless vicitm of trauma is dead. Trauma surgeons will tell you,"Dead trauma is Dead!" But what is "Dead"? Lack of a palpable pulse is not necessarily dead if there is a reversible reason for it, such as loss of blood or mechanical interference that prevents the heart from filling with blood (usually fluid or gas where it does not belong, compressing the heart so it cannot fill with blood). It is also true that attempting CPR on an uresponsive, pulseless victim of blunt trauma may buy them some time, IF there is a reversible cause. And if they are truely dead, you can't hurt them by trying. While there are documented cases of people surviving falling from great altitude, they are rare and involve factors that served to increase the distance over which they decelerated from terminal velocity. The simple fact is that a right angle impact with normal solid ground at 120 mph is seriously bad news. If the crater is a foot deep, the AVERAGE deceleration would be about 450G and if it is 6" it would be twice that. Survival in such a case is remote, at best. On the other hand, the blunt trauma associated with misadventures involving high performance parachutes and low altitude canopy collisions or cutaways may well be survivable and CPR, if the victim is unresponsive and pulseless, is definitely appropriate. Just remember that there may be spinal injuries and don't move the victim unless ABSOLUTELY necessary for safety reasons. If you MUST move them, immobilize the cervical spine to the best of your ability, perform CPR when you are out of immediate danger, pray, and, when the medics arrive, let them do their job. For those interested in my credentials, I am a Board-certified Emergency Physician with 30+ years of experience including time in a Level-2 Trauma Center. Ralph Johnson MD PS: I wholeheartedly endorse learning CPR and basic Life Support and first aid. I have no doubt that most of you already have done so, but for those that have not, do it ASAP. You never know when your ability may be the only thing standing between another human being and the grave.
  14. Periapt

    What's a Death Rig look like?

    I don't know how common it is, but I do know of one individual who jumped the rig of a friend who had bounced (on April Fool's Day, no less). In fact, it became his primary rig. He is still in the sport, has 20,000+ jumps and runs his own Jump School. I don't know what eventually became of the rig, but I doubt he has it any more (the incident occured nearly 40 years ago).
  15. Periapt

    What's a Death Rig look like?

    I had a crossbow container with the main container cut down so it could just contain a Mk1 PC. It had Quick-ejector snaps, blast handles on both the main and the reserve and the top cone had a tendancy to hang-up on pulling if I didn't sit up on opening. The only thing that was ever a problem was that damn top cone. The smaller Thunderbow piggyback had the same issue, made worse by the tall, rotating cone that was on the top flap. Gary Hattenschwiller, the rigger who supervised me in modifying the main container, solved the cone problem by using a very short cone that I remember as being from a Navy chest pack. Once this was done I never had any problems with pack closures. My capewells were 1-1/2-shots and the blast handle on the main NEVER gave me any problems (I never had the occasion to pull the reserve on that rig). The reserve ripcord handle had the center post drilled out and both had a metal sleeve that the military used attached to the end of the housing. I don't recall seeing those on any other sport rig with blast handles. I frankly liked the blast handles. They were always where you expected them to be and were less likely to snag on things. D-3017