riggerrob

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Everything posted by riggerrob

  1. riggerrob

    Buying used tandem gear from Lodi Advice

    A couple of local DZs use second-hand tandems they bought from Lodi. Mains were due for reline, but harnesses and containers only had minor scuffs. Given the slower pace of jumping at Canadian DZs, these Sigmas will easily last another decade ..... and thousands of jumps.
  2. riggerrob

    Who can reline a canopy?

    Written rules (de jure) say that lines can only be replaced by Master Riggers, because if installed improperly, new lines may adversely affect strength, opening or flying characteristics. In practice (de facto) many senior riggers "exceed their certificates" by re-lining parachutes. Since the courts have not decided precedent, any injury resulting (from poorly installed lines) will see the senior rigger standing alone on court. As for Master Riggers supervising more junior riggers - doing major repairs (e.g. line replacement) - the Master Rigger must do the final line continuity check and trim check and ensure that all the lines are correctly sewn before signing on top of the less-experienced rigger's' work.
  3. riggerrob

    Tandem Terminal

    The period of no-drogue tandems was short because high-speed openings are hard on the human body and even harder on main canopies. Ted Strong started experimenting with tandems in January 1983. Relative Workshop stated a few months later. Strong's only canopy (main and reserve) was the Mighty Mack Master 425 made of F-111 fabric. After tearing too many mains, Strong introduced drogues. By 1984 drogues were standard on Strongs. RWS introduced drogue S a year or two later. All the early, drogue-less Strong containers were updated at the factory. I have only jumped a drogue-less Vector and only for one day. By 1987 it was considered obsolete.
  4. riggerrob

    Precision 365 Tandem line trim

    master rigger, Did you notice that I started that sentence with "Something like ........"
  5. riggerrob

    Precision 365 Tandem line trim

    Just measure the slack on the old lines ...... before you cut them off. Something like 2 inches slack on B lines, 3 on C and 5 on D. It is not rocket surgery as long as you keep things symmetrical. Overall line trims on Precision 365 and Icarus 365 are the same. I have even sewn Icarus line kits onto Precision canopies and they fly great!
  6. riggerrob

    Tandem Terminal

    During Argus testing, Strong strapped a 500 pound dummy to a DHT and tossed it out of an airplane. When the dummies exceeded 200 miles per hour, the Argus brain decided "this is crazy" and turned off. It created a dusty crater in the desert. After a second dummy created another (expensive) crater, Strong banned them for tandems. 500 pound barrels are standard cargo for military TIs resupplying troops behind enemy lines. The problem started with AAD engineers not knowing how fast tandem terminal was. Fortunately, they corrected the software and it stays awake/functional faster than 200 mph and they are approved in Strong tandems. Edited to correct brand of AAD
  7. riggerrob

    Limit on adhesive ripstop tape patch size?

    Double-layer patches last longer ..... more than 200 jumps. If you want to get fancy, ask a rigger to sew around the edge.
  8. riggerrob

    I love you moderators

    Yes! Thank you moderators for keeping this forum neat, civil and on track.
  9. riggerrob

    Stuck on PLFs: How to Retrain the Brain?

    Find a flight of stairs with grass at the bottom. Pretend that you are only a few dozen feet about the dropzone. Walk down the stairs while flaring with your arms. Talk your way through the process. Ask an instructor to critique your first dozen practices. Then practice on your own. Before you go up for your next jump, ask the same instructor to critique your last practice. Since military PLFs are so deeply ingrained you may need hundreds of practices to learn new landing techniques. Walking down stairs is less expensive than walking out an airplane door.
  10. I too have a pair of discs bulging out from my vertebrae. In the short run: consult your doctor (ideally a sports medicine Doctor) and physio-therapist. Listen carefully to your physio-therapist and do your exercises several times per week. The key to avoiding re-injury is strengthening and stretching all your core muscles to pull your spine back (apologies for the pun) into correct alignment. If you worry about information overload, try to find a skydiving school that breaks ground school into two or three short sessions. For example, some schools teach ground school on Thursday evening, then jump students on Saturday. Another alternative is doing ground school on Saturday. Saturday afternoon and evening, hang around the landing field watching jumpers get dressed, rehearse, land, pack, etc. Sleep on the new information, then do your first jump Sunday morning. "Sleeping on the idea" allows it sink into medium-term memory, improving performance during your first jump.
  11. riggerrob

    Riding on a biplane wing

    Start with an airplane that climbed slowly when it was new, add a warm summer day, load near gross (errrr ..... perhaps ... maybe a few pounds over) add drag, then wonder why it won't climb???????? The one lesson learned was about "safety straps." Both skydivers survived because they stayed with the plane. In an earlier accident, rumour has it that the skydiver (riding outside the cockpit breathed too much carbon monoxide, lost consciousness, lost his grip and fell off too low to deploy a parachute. Why do we keep repeating mistakes? Aren't us old farts supposed to share our scars and scary stories with young skydivers to help them park from our mistakes?
  12. riggerrob

    Skydiver's Anonymous

    Reminds me of a book entitled "Positive Addiction." The author (a medical doctor) said that humans crave endorphins, adrenaline, dopamine, etc. in varying degrees. If your day-to-day existence does not produce enough "feel good" endorphins, you need to engage in recreational activities that stimulate production of endorphins. Endorphin generating activities may include barroom brawling, BASE jumping, marathon running, petty crime, skiing, warfare, etc. The author recommended adrenalin sports as positive ways to generate feel good endorphins. For example chosing marathon running over morphine injection is a "positive addiction."
  13. Showa L2D3, a licensed version of DC-3 built in Japan. Less than 800 were built in Japan during World War. Extra cockpit windows distinguish it from American DC-3s. This example was captured by Americans and repainted with American insignia. Don't know if it was jumped byJapanese paratroopers as most of the histories refer to paratroopers jumping from Japanese-designed bombers and transports. Russians also built DC-3s under license from Douglas during World War 2.
  14. If American parachutists are worried about tunnel-rats, why not include an end date? USPA's BOD would be forced to re-examine the new policy two years down the road and decide whether to continue allowing tunnel-rats to join.
  15. Warning: historical trivia. Jerry's rumour is based on facts. NACA (Langley, Virginia) built its first vertical wind tunnel in 1935. It was only 15 feet in diameter and was used to spin-test model airplanes. These models closely matched loft lines of full-sized airplanes and had adjustable internal weights that permitted testing at a variety of weights and balances. In 1941, it was replaced by a 20 foot tunnel that is still used for spin-testing. Rumour has it that a variety of US military jumpers experimented in NACA's vertical wind tunnel. The first civilian/sporting wind tunnel was the Aerodium built in Quebec circa 1980.
  16. riggerrob

    Another 3D printable rigging tool

    The Capewell Service Bulleton CW01-03 shows a test block similar to this new plastic block. Capewelll specifies soft aluminum or soft stainless steel. Part of Capewell's problem was that they used a different alloy of stainless steel than the original MIL SPEC. John Sherman (Parachute Labs) will give you a lengthy description of the various alloys used to make ripcord pins and will conclude that PL uses the best alloy.
  17. Dear Gowlerk, We debated that exact point during CSPA's AGM. One side stated that tunnel fliers would bring plenty of new revenue (membership dues) to CSPA, with little additional expense ... perhaps maybe tunnel-specific coach ratings. Opinions, prejudice, bias, boilerplate, BS, etc. flew fast and furious during that meeting. Most of us concluded that new revenues would exceed new expenses.
  18. riggerrob

    Pull at...whaaat?

    Show a pilot-chute above 2,500 feet.
  19. riggerrob

    Custom art on rig

    ***Unless the art work is awesome, like some of the old racer pop tops. .......... Lee[/quote ---------------------------------------------------------------------- If you paint or embroider on a non-structural part - while the rig is unpacked - I don't care. By non-structural, I mean: pin cover, pilot-chute cap, leg pad and maybe even a riser cover. It helps that most pin covers are multi-layer (MDS plastic, ballistic nylon, para-pack, Cordura, foam padding, etc.) so that even if you ruin the outer layer, it will not affect function. OTOH if you spray adhesive paint (epoxy or cyanoacrylate) on a single-layer reserve side flap - while packed - I will not let you jump it. I fear that adhesive paint might penetrate the side-flap and free-bag and glue the reserve closed.
  20. riggerrob

    coil lock

    I have only seen one swage come loose. That was ascribed to poor quality control at the factory .... er .... the final inspector missed a missed swage/squeeze/crimp. If the end of a spring does get loose, it is less likely to snag on a hard surface .... like a kicker plate. As for ripcords swages/pins/balls coming loose .... I have never seen it despite manufacturing hundreds of ripcords ( while working for Butler, Rigging Innovations and ParaPhernalia). I also assembled a few hundred pilot-chutes while working for Butler.
  21. riggerrob

    Custom art on rig

    ----------------------------------------------------------------- Your literacy has improved immensely over the last few years.
  22. riggerrob

    coil lock

    ***"Coil lock" could mean two different things: 1) ....... 2) The pilot chute fabric is tucked under the base of the pilot chute, thereby locking the pilot chute in the compressed position by it's own tension For #2, the practice used to be to stuff all the loose fabric under the base ....... The idea was that it helped serve as a good base "kicker plate" for launch, and also prevented a loose spring end from burrowing down into the canopy fabric and getting itself stuck there. ........ ----------------------------------------------------------------------------- First time I have heard that! .... but I have only been a rigger for 33 years ....... I do know that when military-surplus aluminum kicker plates got prohibitively expensive (1970s) many riggers substituted paper plates. Since then, most sport containers have plastic (e.g. MDS Nylatron) kicker plates sewn into internal flaps.
  23. riggerrob

    Custom art on rig

    I have to agree with Rigger Lee on this point. Many years ago, a rigger brought an old Talon to Rigging Innovations' factory. I was sceptical because all the (originally silver) binding tape had been coated with black shoe dye. The second owner could not identify which type of shoe dye had been applied. Sandy Reid replied "Because we do not know what chemicals are involved, this rig was never here. We never saw it. We will not do any repairs. We will not do any updates."
  24. riggerrob

    Buying used tandem gear from Lodi Advice

    The original regulation (banning mixing-and-matching tandem components from different manufacturers) was to discourage riggers from installing round or Micro-Raven reserves in tandems. Back in 1983, only two factories built tandems. They had not tested the other manufacturers' components. Later on lawyers confused the issue by suing Strong Enterprises for an accident involving a TI (certified to jump another rig) who jumped Strong gear, but had never jumped with a Strong Examiner. That lawsuit was expensive to defend even though Strong was eventually found innocent. Rules are more "common sense" in Canada. I have only packed 425R reserves into Strong DHT and I have only packed big Angelfire reserves into Racer Tandems, but I have packed Pioneer, PD and Precision reserves into Vector/Sigma tandem containers. I have also offered to pack Next tandem reserves into Sigmas. May I say some good things about Precision tandem reserves? They passed three certification trials: first for the Eclipse tandem, and secondly for the Finnish Army. Finnish Army pattern tandems evolved into the (current production) Wings Tandem. My last tandem "save" ended with the TI grumbling about how "boring" his Precision TR-350 reserve flew. OTOH I used to jump PD-360 canopies (F-111 fabric, etc.) back when they were fashionable as mains. I often jumped with "well nourished" Bavarians. Is there any wonder I have an aching back, aching knee and aching foot. I would rather be bored under a reserve. P.S. The best cure for old aches is regular exercise. I celebrated my 60th birthday by hiking the Groose Grind. The following weekend I did 10 tandem jumps.
  25. I see tunnel-flying, para-gliding, speed-flying, etc. as the future of skydiving. When gasoline becomes too expensive for motor-sports, the average skydiver will quit jumping out of airplanes, but take up one of the above-mentioned sports to occupy his/her weekends. At the same time (prohibitively expensive petroleum) USPA will be forced to chose between dissolution or including another Aerosport. Far wiser to include other Aerosports early .....