IJskonijn

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Everything posted by IJskonijn

  1. Wearing earplugs during freefall and canopy ride is safer than not wearing them. Yes, hearing is reduced (more on that shortly), but so is mental distraction! The first time I jumped with earplugs (on the ride up and on the jump down), the effect was staggeringly huge! All of a sudden I had MUCH more mental clarity in my head. There's a joke floating around about finding your way in an unfamiliar city (driving a car), and turning down the radio so you can read the signs better. It works, precisely because your brain has less junk to filter out before it gets to the useful sensor data. Same with skydiving. Sidestep: hearing under canopy is severely overrated anyway. I jump CRW a lot, and even without earplugs under canopy while touching end-cells (i.e. WAY closer than an average freefaller would be comfortable with), it is difficult to understand each other clearly. Rely on vision and situational awareness to prevent canopy collisions, not on hearing. I personally use earplugs 100% of the time on the ride to altitude, and only when I do CRW I take them out before exit. For anything else (freefall, hop & pop, video, etc.) I leave them in until after landing. And even with earplugs in, your ability to hear someone shout under canopy won't change drastically. Earplugs are not racists, they reduce all sound equally (generally speaking, but there's some small frequency variability in it). They don't fully block any sound, they just reduce the amplitude. They equally reduce the amplitude of the wind noise, of the other canopy shouting at you, and of your beeper going off. So if a sound (say: your beeper) is loud enough to hear without earplugs, then it will be loud enough to hear with earplugs. Signal-to-Noise ratio (SNR) is what is important here. As long as you reduce everything to below the pain threshold, you can still hear everything almost as good as before.
  2. This feels about right. My L160 fits neatly in my Vector II v5 rig, that also fits a Silhouette 190 neatly without even adjusting the closing loop. L176 fits neatly with a longer closing loop, and L143 is the smallest I can get in it, and in that case the closing loop is the shortest it can be before the grommet thickness prevents me from closing the rig.
  3. I have my Viso II set on STU, since I do mostly hop & pops (CRW). My logbook currently outpaces it by about a hunderd jumps, and I notice it sometimes detects a jump from 2000ft because I made a quick spiral to get down... The logging part is probably reliable enough for FS or FF jumps, but anything else it's accurate enough to use for logging. On the other hand, it has always given me the proper altitude, and its backlit feature worked a charm on my night jump. Plus I can wear it higher on my arm, reducing snag hazard near my wrist (always an important consideration when doing CRW).
  4. Agreed, tunnel time is a great way to become more familiar with at least part of the dive. I did some tunnel time during my own AFF course, and it made a world of difference in my stability in the air afterwards. Worth every penny, and I would not hesitate to reschedule the AFF jumps for doing this, and pick up the jumps afterwards. The mental picture also becomes much easier once you know you are able to do all the individual pieces. Tunnel teaches you to fall stable and controlled, and you already said you're good under canopy. Exit is overrated (especially if you can get stable in freefall), so that sounds like the whole puzzle to me.
  5. [dark] Great, so you can have an open casket service! [/dark] Skydiving fullface helmets don't offer anywhere near the amount of protection you need in any serious crash. Just compare the amount of padding material in a motorcycle helmet vs a skydiving helmet. The motorcycle helmet manufacturers don't put the padding in because they like it, they put it in because they NEED it to meet the minimum safety standards for such helmets. And a motorcycle crash isn't that much faster than someone crashing while swooping something
  6. For me, it's a primary requirement (if I were to be shopping for a new rig now). But that's because I do lots of CRW, and I don't want any chance of stray lines getting stuck behind my reserve pilotchute during a wrap or something. For the generic jumper, it won't matter much above personal preference (I know some that like to have it external, using the "less stuff in between the pilot chute and clean air" argument).
  7. I agree, the jumper him/herself need to be on top in terms of sizing and measurements, or find a capable rigger to help with that. I'm not specifically referring to a certain type of rig (although I am aware of some problems with some rigs in that respect), but I'm also referring to getting the correct size. Overstuffing the reserve tray and/or the main tray is very unlikely to improve the openings. This is both on the jumper (to know what canopy type and size they want to jump) and on the manufacturer, to know what size rig conforms to what types and sizes of canopies. Pack volume might be good to know, but unless we can get a globally uniform and reproducible way to define and measure pack volumes, it isn't going to be useful.
  8. As already said, it needs to work and it needs to fit you properly. All the features, colours, trim and other crap on a rig won't help you one bit if the rig lands in a different place than you do. Also, if the corners are so sewn in ("dynamic" corners) that the reserve freebag is having a tea party on your back after you punched it, that's no good either. There's no colour scheme in the world that looks good with lots of blood on it. Only once those are all taken care of, then you can go to town with all the nice little features and gimmicks and colours that they offer.
  9. Which is, incidentially, what you risk doing yourself more and more if you downsize too agressively...
  10. Does downsizing solve a problem you currently have? If not, there is no reason to downsize. If it does, go ahead and downsize, but try not to create other problems down the road. Possible problems to consider can be: Being bored out of your skull under your current canopy (image you flying a Navigator 280 for 500 jumps). Not being able to jump in certain weather conditions (higher winds being one of them). Stopped learning under your current wing (with the wing being the limiting factor, not your mentality).
  11. I think there are quite a few mounts available that make it more snag-resistant. No camera mount is fully snag-free, and for that matter no helmet is fully snag-free! I got in a wrap (CRW) a while ago, where the lines of the other guy's canopy got stuck in my neck behind my half-shell helmet, not even on the camera mount. Since I had a camera on it, I had a cutaway system on it as well. And because I was able to cut away the helmet, we could solve the wrap without the bottom guy chopping. Don't rely on adhesive mounts to break off in case of shit happening. Rely instead on some system that is DESIGNED to release easily and quickly when necessary.
  12. In that respect, I'm less worried about people with a camera and two DSLRs on their helmet than about people with a gopro. You don't slap 3kg of glass on your helmet without thinking hard and deep about the consequences and its effect on your jump...
  13. If I understand canopy flight correctly, trimming it like that would put the canopy in a minimum sink configuration, which would mean maximum airtime, and thus maximum decision time. How was the stall behaviour on toggles? Did it stall immediately or did it need quite a bit of toggle input for quite some time before stalling?
  14. An easier solution (if you want a good binding) is to get a logbook with the cheap plastic binding, and then take that to a copyshop and pay them to put a metal spiral in it. If they can't do that, they're not worth your money anyway. Or, if you want, I can send you the basic files I used for my logbook. Adjust as desired (you might not want photo's of crazy-awesome CRW formations on the covers ^_^), and go have fun. Seriously, designing a half-way decent logbook isn't rocket science.
  15. In the past, I've had plastic spiral bound logbooks. They suck indeed. My last two logbooks are of my own design with all the space I want, precisely how I want it. I like logging, so I rather spend time to design a good logbook for my purpose and money to have them printed and spiral-bound with a metal spiral at a copyshop. The metal spiral hasn't failed me once, and the booklet contains 5 jumps per double page, 200-ish jumps total. The whole printing and binding part was surprisingly cheap as well. With fullcolour front and back (some nice photo's went on those pages) and the rest black-white, using heavy (150gr/m^2) paper and a metal binding, cost me somewhere around €20 for two booklets A5 sized. Totally worth it. I'm going to adjust it a little bit, and have some more printed soon since my current one is almost full.
  16. Good plan. I can think of very few situations under my reserve where I would want LESS fabric over my head, rather than more...
  17. I can't speak for the other clubs, but at my home club only the pilot uses a radio. There is a big-ass T indicator (bright orange, 8 meters long) on the landing field, and there are good landing fields all around for a LONG LONG way. Before the jump, students get a thorough briefing on the supposed pattern, wind direction, exit point and the land marks around them and where they are in relation to the landing field. And yes, we occasionally have a first-jump student take a cross-country jump because they forgot to look down between their legs, but those instances are few and far between. I don't think you solve that with radios, given the amount of stories I heard where the ground instructor heard the student radio just fine, but the student claimed he didn't hear anything! Some levels of stupidity are just unsolvable. We mostly solve the lack of radios by good thorough briefings before-hand. And even dropping just three students out of a C182, most of our instructors tend to take two passes to put them out.
  18. Radios have plenty of downsides as well, so it's not something that no student should be without. In fact, I know of no DZ here in The Netherlands that still uses radios for their student training. Rather, I think no student should be without an instructor watching out for them either from ground or from air, up to and including until they are properly debriefed and back in the hangar. My home club has a club rule that there always needs to be an instructor or assistent instructor at the DZ when students are jumping, since the DZ is off-site from the airfield.
  19. Just had a ride on my PDR 193 this weekend. No linetwists on opening, slow, steady, never heard of harness turns, sinking like styrofoam on water, feels like a battleship when turning. Stood up the landing easily. All the things I want in my reserve.
  20. Wave the PSB in their face. Any skydiver that thinks any part of their equipment is truly maintenance-free and without any possible fault is either an idiot or has just woken up from whatever rock they lived under. And if you don't plan on exceeding 27.000ft, compliance is mandatory at any opportune moment between now and 31 May 2020. With Dutch 6-month repack cycles that's two or three repacks before that deadline passes.
  21. When I was in the UK to jump (although on my Dutch license, I don't have a USPA license), it was enough to provide proof of 3rd-party liability insurance by the Dutch KNVvL association. Without that, I would have had to buy BPA membership or some such thing to have enough 3rd party insurance. So I think for most countries, it is not so much that you are required to buy membership, but that you are required to have 3rd party liability coverage. If you cannot prove that you have, then buying a membership is a good way to have that coverage.
  22. 15 megapixels means nothing at that level. The added value of having a really good stills camera with a good sensor, aperture, high-quality lens and equal image stabilization is enormous. Same for video. Action cameras are getting pretty good nowadays, but full-sized video cameras are still that much better. Also, when you're getting paid big bucks for video/stills (maybe some sort of one-shot promotional event), you can't have camera failure as an excuse for not having the shot. So you bring two cameras. Plus, a very hard opening can kill you. At some point, it doesn't matter anymore how much weight is on your helmet. And I see videographers more often than not make canopy choices specific to their situation. Some canopies are known for hard openings, some are known for having a cup of coffee in between linestretch and full inflations. Dacron lines also help, as they are more elastic than microline or vectran. Slider choice and pilot chute choice also influences the force of opening.
  23. Haha! The way this topic turns out, it seems like it's been flipped over by turbulence! Me being the physicist that I am, I'll happily join the discussion. From an aerodynamic point of view, what really matters is the force per unit area on your wing (or strut, or control surface, or line, or whatever). Mass (in kg) is irrelevant insofar that you need a (non-fixed in both direction and magnitude) vector called acceleration to get the force from the mass (Newton's famous F = m*a). As mentioned, the mass of the system stays the same no matter how hard you whip around on front risers, but the force that your lines have to hold sure does change! So the technically correct (the best kind of correct) definition of wingloading would indeed be one of N/m^2 (because imperial schimperial), rather than kg/m^2. Which would be weight per unit area. And since weight is changed by a change in acceleration, wingloading does change when you give some sort of input under canopy. But in most cases we can simplify things by saying the acceleration is constant and equal to the local earth gravity. In that case, definitions of wingloading in kg/m^2 are equivalent to those in N/m^2, so under that simplification this entire discussion is completely pointless.
  24. In hot weather, it pays to think ahead about where the turbulence will be relative to the landing area. That type of turbulence is easy to predict, as surfaces like tarmac or gravel heats up more in the sun, and the air boils off those surfaces faster than off the (relatively) cool grass, causing turbulence. So in general for landing area, you want something smooth all around. With that I mean that it is way better to land in the middle of a large grassy field, rather than at the edges where the boiling air is likely more violent and can throw you around much more (not good when your altitude is measured in single digits...). Also, avoid the peas for the exact same reason.
  25. Last time I was in Florida, we hit the turbulence on hot days at altitudes up to 5.5kft. For me, flying through it with increased airspeed is impossible, since I won't have arms left if I have to frontriser for 5000ft. So I took the paraglider approach, to fly through it with a little brakes to keep a good feel for what my canopy was doing. The turbulence was never so bad though that I feared for a canopy collapse, flying on a Lightning 160 at 1.35 wingloaded. Then again, Lightnings tend to recover quickly from partial or full collapses, so ymmv. Another disadvantage of spiraling around is that you are more likely to lose sight of the other canopies in the air. An unplanned canopy collision is bad news with or without turbulence.