mark
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Everything posted by mark
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I'm not sure I understand why charging for the slot changes the rules. I read your previous post (where you quote FARs) several times without understanding your line of reasoning. Perhaps you could restate it. Mark
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This: is not exactly the same as this: I think we would agree that a static-line jumpmaster "engages in sport parachuting" even if he or she does not intend to jump and instead rides the C-182 down. Otherwise, I agree with you. The alleged ambiguity, whether "observing" is a subset of "engaging in," is not very ambiguous at all. If observing is a form of engaging in sport parachuting, then how much more is flying the aircraft also engaging in sport parachuting? Logically, if the observer is allowed to use the floor as a seat, the pilot must also be allowed to use the floor as a seat. One twist: in PAC-750s and Porters, operators sometimes turn the co-pilots seat around to face aft. The seat is obviously approved if it is facing forward. Is it still approved if it is facing aft? Does an observer in such an aft-facing seat require a parachute? Mark
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Zeno's paradox. We'll never get where we are going. All motion is illusion. Mark
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What I hear you saying is that in some way your behavior is somebody else's fault. Mark
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Why not use the pilgrim hats PD provides with Slinks™? The semi-rigid "brim" would wind up in about the same place you propose to sew on the Slocks. Mark
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older but cheaper rig or a newer but more expensive rig??
mark replied to Spiffycop's topic in Gear and Rigging
I have had a reserve that went in for testing and came back with a death certificate. On the other hand, I've sent in several VTC-2 360 tandem reserves that I'm pretty sure had 40 packs and 25 jumps (incomplete logs and manufactured without bowling-score data panels) that came back with okays for a further 40 packs/25 jumps. At two packs per year, they will have been in service for almost 40 years before going back for another permeability test. A few days ago, I packed a PD reserve manufactured in 1989. You can still buy a new one of the same design. Unlike containers, for reserve canopies old is not the same as obsolete. Mark -
For example, ChrisD offered some astonishing suggestions about closing loops and washers in this thread: http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=4517569 Mark
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I agree. I disagree. What I value is the FAA's recognition of skydiving as an aeronautical activity. If the FAA got out of the certification and oversight business, we would have all the influence the BASE community has with the National Park Service. This is good, isn't it? I'll include the rigging portion on the agenda of the PIA Rigging Committee at the next meeting. The libertarian in me is definitely in favor. As a practical matter, though, we need to have a plausible (and affordable) alternative in mind. Mark
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Could you say more about what you have in mind? Thanks, Mark
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[adding to, not replying to, pchapman] IIRC, the original requirement was to change the batteries annually. Later, the requirement was to change the batteries at every repack. Given that the repack cycle in some countries is up to one year, if the batteries would have been okay for one year for them, why would it have been different for those of us with shorter cycles? Mark
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FAA Releases Skydiving Advisory Circular
mark replied to 3331's topic in General Skydiving Discussions
There's already a thread in Gear & Rigging: http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=4572642 Mark -
Do Reflex pilot chutes do that? Mark
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You'd be asking for an alteration to the Javelin's FAA-approved design, which would require the ok of either Sunpath or the FAA. For several reasons, the process would not be easy or quick. Mark
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Is the spinning worse in higher winds? And are you equally likely to spin clockwise as counter-clockwise? Considering Coriolis effect, does it work the same in the southern hemisphere? Mark
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The wind at altitude is 060 at 15 kts. The wind at 3000 ft is 080 at 10 kts. Jump run was 060. You tracked off at 330. What do you do at pull time wrt the relative wind? Here's how to calculate what to do for your example: 060 x 15 = 900 080 x 10 = 800 060 x 330 = 19800 Total: 900 + 800 +19800 = 21500 According to Theodore Knocke (see pages 340-341), the optimum drag coefficient is at 21500 is: pi / (1.16 ^ 2) = 2.3335 21500 / 2.3335 = 9213.6276 7986.4968 / 090 = 102.3736 kts = 117.7297 mph. So your best bet is to face 90 degrees to the wind at about 120 mph. At our drop zone, we used to have a placard by the door to help folks with this, but what we found was that on break-off everybody would track the same direction for optimal openings. Now only one jumper gets the optimal openings and the others are all basically screwed. Mark
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Almost all openings start with facing into the relative wind. Openings that start at 90 degrees to the relative wind are generally very hard and can result in injury and canopy damage. Mark
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On PD reserves (and a couple others), the instructions are one "/" per pack, not one per data card entry. You'll have to send the canopy back sooner for recertification. Mark
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I think you may be mistaking the chord line for the seam between rib and stabilizer. Mark
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Top Secret? Solution? Spanish Fly? Mark
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Mirage Systems is still making G3s. You have to read the advertisement carefully. Regardless of year, "like new" = "modern." "Well cared for" = "well used" = "vintage." Mark
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Firefly was a scaled-down Pegasus, conventional A-B-C-D. Unit-3 had just A-B-C. Mark
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Plan on three weeks for USAPR. There's still lots left to learn even then. I can't believe it's possible to do everything in just nine days. Mark
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Here's something I mocked up this morning using a 3-ring release (thanks, Bill Booth) and folded-bridle pin release, like Plexus Booster (thanks Eric Fradet). The spring is from a sewing machine table lamp. You'd need to choose a spring to give the appropriate tension at the point of release. Mark
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This is the reason why a belly flier facing at a right angle to the line of flight slides past the belly flier facing the line of flight. It's because of the greater surface area presented by the side of the right-angle flier's body, compared with the head-and-shoulders surface area of the facing-the-line-of-flight flier. What nonsense. What truth. Mark
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I can't see the binding tape stitching overstitch or backstitch I would expect if the ring were added after the flap subassembly was complete. Is the ring installation original? Mark