riggerrob

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Everything posted by riggerrob

  1. riggerrob

    Leg-strap bungee necessity

    Butt bungees only became fashionable during the mid-1990s. They became fashionable for two reasons. First: sit-flying became fashionable in North America. Secondly: this was about 5 years after Rigging Innovations introduced hip rings. Now ringed harnesses were being jumped by second owners who were different sizes than people the harnesses were originally built for. Hip rings allowed greater flexibility, making it easier for leg straps to slide toward knees. Butt bungees don’t prevent people from falling (butt first) out of harnesses) rather they prevent leg straps from sliding away from your buttocks.
  2. Few regulations, but you will score the best at classic precision landings with a large, specialized accuracy canopy like a Para-Foil, Eiff or PD Zero. Specialized PL canopies are usually low aspect ratio, 7-cells with huge stabilizers, keels, flares, vents, etc. The low aspect ratio reduces heading changes near the stall. Low wing-loading reduces the number of broken bones when you stall vertically onto the tuffet. By large, I mean wing-loading in the 0.7 pounds per square foot range. Suspended weight includes your body, plus helmet, clothes, harness, canopies, etc. Your second best choice is a large BASE canopy. Third choice is a large, 9-cell ZP canopy like those jumped by students. If you try to jump a small, 9-cell, ZP canopy at a serious accuracy competition, judges will politely suggest that you enter the sport accuracy category. With practice, any canopy can be landed, consistently within a metre of target centre, but faster canopies require far more practice. I earned my CSPA Exhibition Jump rating on a Stiletto 135.
  3. riggerrob

    Ideal body type for skydiving

    Flexibility can be improved in yoga studios.
  4. riggerrob

    DZ wind limit tdm skydiving

    First off: please do not use the word "legal" around me because I am allergic to lawyers who shamelessly argue any side of a case as long as they get paid. Lawyers and courts do not care about the letter of the law. Without written laws, you have to revert to "best business practices." If Strong Enterprises tells you not to jump tandems in winds exceeding "X" knots, you are morally obligated to stay on the ground. When forced to chose between slightly different standards (from two or three sources) work to the tightest, most conservative standard. The other vaguery is local wind patterns. For example, a dz may be safe to jump when winds remain steady from most directions, but winds get turbulent from the south. Then you have a legitimate reason for refusing to jump in southerly winds. Similarly, if southerly winds increase the risk of landing on a obstacle (e.g. lake), you have a valid excuse to stay on the ground. My personal standards are maximum 23 knots wind or gusts exceeding 5 knots. I watch the wind sock or wind-meter for 30 minutes before making that decision. Major vertical turbulence is also a valid excuse for not jumping.
  5. This thread started with a simple product announcement … perhaps not within the letter of dz.com policy, but almost harmless. If the OP used "fucking sexy ass skydivers" as a verb, that is correct English, Dutch, etc. However the choice of vocabulary might offend some of the delicate flowers in the audience. Back in the good-old-days, skydivers were lewd, crude, vulgar, etc. and the dz was a safe place to vent our frustration with the "real world." many skydivers prided themselves on their "dirty biker" image. Sadly, most dzs have become more and politically-correct during this century. Boring! I have used skydiving as a cure for depression for almost 40 years. I started as a sport jumper back when sex was safe and skydiving was dangerous. Sadly, I was kicked out of the skydiving crowd after a plane crash. Bullies started the pushing, then my boss parked airplane wreckage where I had to look at every day on my way to work, then lawyers insisted on dragging out a simple lawsuit for 8.5 years. The odd thing was that I worked hard at physical rehabilitation during the year immediately after the crash. I could not explain clearly why I was working so hard, just knew that I had to "get back on the horse." I only lasted a year and a half until the airplane wreckage was permanently parked near the airplane gate. Since then I have been diagnosed as: insomniac, anxious, depressed,acid reflux, heart murmur, PTSD, etc. I have read dozens of books about PTSD and earlier today watched Sebastian Junger's videos on PTSD. Hopefully this new book offers advice on how to recover from that sort of long-term depression.
  6. riggerrob

    Can You Install a Skyhook Into any Rig? How?

    When in doubt, ask Parachute Systems. If they say that your Vortex is easy to retrofit with a Skyhook, great! Buy a new free bag and lanyard from Parachute Systems and ask your local rigger to install them. Make sure to provide your rigger with an updated version of the Vortex manual. Then you have a fully TSOed rig according to Parachute Systems factory drawings. OTOH most Master Riggers are reluctant to retrofit RSLs to older rigs unless they can do a close copy of the factory RSL. Skyhooks are just fancy RSLs. Honest riggers refuse to retrofit Skyhooks to older rigs because they lack precise dimensions. We think it far wiser to ship the entire rig to the factory for Skyhook updates. Most riggers flatly refuse to do RSL, AAD or Skyhook retrofits to rigs that never had them. RSL and Skyhook retrofits require precise dimensions only available at the factory.
  7. riggerrob

    Why do swoopers always start by turning?

    Steeply banked turns increase G-loading. Increasing Gs fools the canopy into flying like it has double or triple the suspended weight. If a jumper weights 200 pounds at 1 G, then he weights 400 pounds during a 2 G turn and 600 pounds during a 3 G turn. Increased G-loading is similar to increasing suspended weight in that it increases forward speed. OTOH increased G-loading also increases rate of descent. Increased rate of descent kills if the canopy flattens out/recovers from the dive too late. Ironically, increased G-loading does not change glide angle by much. Glide angle remains much the same independent of speed. Swoopers translate the extra speed/energy - generated during steep turns - into extra lift during landing. They only need small riser or toggle inputs to start their landing flare. Once their flight tragectory has levelled off, they gradually trade extra speed for lift.
  8. riggerrob

    Glide Path Nova

    I jumped Nova 150 about 50 times and enjoyed it. Openings were a bit harder than modern ZP canopies, but about the norm for the early 1990s. The only problem occurred when I pulled down on a front riser, then the leading edge folded under! I also have a few hundred jumps on an Ariel 150 along with many hundreds more on Sabre 170, 150 and 135. Eventually I graduated to a Stiletto 135. I weighed about 190 pounds (naked) back in those days.
  9. riggerrob

    using an old reserve as a main

    People are forgetting how much main canopies have diverged from reserve canopies over the last 30 years. Many younger riggers refuse to repack reserves older than themselves. Even grumpy, old, grey-bearded Master Riggers like me (62 years old and rigging for the last 35 years) want nothing to do with reserves built during the 1980s. Heck! I no longer even have the tools needed to inspect round reserves made during the 1980s. Back in 1989, zero-porosity fabric and zero-stretch suspension lines had only been recently been invented. Most skydivers loaded their 7-cell, F-111 fabric mains about 0.7 pounds per square foot. The range of main sizes was severely limited and only petite women jumped 176 square foot mains. Only a few brave souls loaded their reserves more than 1:1. Early BASE jumpers just used their regular skydiving canopies (e.g. 7-cell, 220 square foot Cruiselite made by Para-Flite). Anyone who expects soft landings under a 7-cell, sub-150 square reserve more than 30 years old should ..... buy the best medical insurance available.
  10. Please tell Jimmy that my Dad survived a quadruple bypass a decade ago and we only had to bury him last week. He survived 89.5 years, raised 4 children, competed at two Olympics, etc. Since Jimmy looks younger and healthier than my Dad, we expect him to last even longer.
  11. riggerrob

    Russian paratroopers

    Russian paratroopers pull a drogue release handle a few seconds after exit. Dumber Russian paratroopers wait until they scare their KAP3 AADe. That drogue ystem softens openings when the jump plane flies faster than 130 knots. It also allows pseudo-free fall from high altitudes, with minimal training. American smoke-jumpers copies the Russian drogue system. Back in the early days of tandem, they used the same F-111 canopies as both main and reserve. Strong Enterprises was already sewing drogues for American smoke jumpers; so adapted a drogue to their Dual Hawk Tandem. Hard openings suddenly became a minor problem along with far fewer torn canopies, reserve rides, etc. An unexpected offshoot was the slower free fall allowed free fall photographers to keep tandems in frame and, a new revenue source for DZs.
  12. riggerrob

    Heli tandems - seeking info

    I have done a few tandems out of Jet Rangers and an Alouette 3. I have also skydived solo from Chinook, A Star and Huey. Start by asking the pilot to reverse the co-pilot’s seat (left side, front). Seat tandems as normal and fasten seatbelts. Belts work best with original seats installed. Above 4,000’ start your normal hook-up procedure. Slide the left door open a minute or so before exit. Slide your butts towards the door. Tell the student to cross their arms on their chest and try to kick you in the butt. Push off gently and wait until 4 seconds after exit before tossing frigid. Yes, you might be tempted to ask the pilot to hover as you exit, but he/she will burn far less fuel (and be able to fly higher) if he/she maintains at least 40 knots.
  13. riggerrob

    Three People Narrowly Escape in Tandem Collision (Video)

    Criticizing the TI for being too busy videoing to pull the reserve ripcord. Landing with a ripcord still in your harness is sloppy.
  14. riggerrob

    Sailrite

    Sailtrite makes great little sewing machines. They will sew E-thread through multiple layers of Corduroy or webbing, similar to a Singer U20. I have been using a Sailrite for the last 4 years and live it!
  15. riggerrob

    Parachute Labs aka JumpShack

    Is Suzie's departure the reason that Jump Shack is advertising for a new Master Rigger?
  16. riggerrob

    Skydive or BASE jump?

    Er ..... jumping single-canopy rigs - from aircraft - was deemed STUPID back during the 1920s or 1930s. Those regulations are written in blood! You may call me grumpy, but I still think that jumping single-canopy rigs - from aircraft - is STUPID. If the aircraft can lift you high enough to use a reserve, then you are foolish to jump without a reserve. Is that blunt enough for you?
  17. riggerrob

    Skydive or BASE jump?

    If you don't know the technical difference between a BASE jump and a skydive, you should not make the jump. signed: Grumpy old grey-bearded Master rigger
  18. riggerrob

    Jumping in Europe

    Look at DZ listings in “Parachutist” magazine (USPA). Visit German DZs close to you and ask them about other DZs. Many well-educated Europeans speak two or three languages, so communication should be only a minor hassle. In the long run you will want to learn how to speak basic German.
  19. riggerrob

    "I hope this finds you well" - really??

    Pluralizing is a way to avoid gender-specific pronouns: he, she, LGBTQ++, etc.
  20. riggerrob

    Looking for some ideas

    A hurricane can dramatically increase tension. The aircraft carrier deck is rolling 45 degrees to the side. Exhausted sailors bounce off bulkheads ....., etc. Seas will need 4 or 6 days to calm enough for the cargo plane to land. Fighters might be able to land in rougher seas because their higher/heavier wing-loading makes they less affected by turbulence but no sane pilot wants to do near a hurricane. Perhaps our heroes are already in cloud when they blunder into the hurricane. Flying through the hurricane bounces them around inside the airplane .... breaking arms, etc. .... if they release seatbelts too early. Flying out of cloud - into the sunny eye - gives a moment of emotional relief but it also applies time pressure. They only have a minute or two to exit. If the last person hesitates and exits late, he will descend into the hurricane wall. In that scenario, I would take exit altitude down as low as 500 feet (150 metres) to minimize the risk of missing the target and reduce exposure time to winds. If a junior jumper hesitated, I would “muscle” him to the door and pull his ripcord as I shove him out the door .... easier to do if he/she is unconscious. The primary reason that we do not drop students in winds exceeding 15 knots is the risk of dragging after landing.
  21. riggerrob

    Looking for some ideas

    Deployment altitude depends upon velocity vector. ... er .... which direction you are travelling and how fast. If jumping from a military transport airplane you can take jump altitude down to 500 - 300 feet (150 - 100 metres) above ground. If the airplane is travelling 100 - 130 knots (160 - 200 kilometres per hour) horizontally, your parachute will open with hardly any altitude loss. If you pull your ripcord in the doorway, your parachute will open with hardly any altitude loss. That gives you less than a 30 second parachute ride.
  22. riggerrob

    AFF training in Canada - Quebec

    Accelerated Free Fall in the USA. Progression Accelere’ en Chute Libre = progression accelerated in free fall. Some Quebec DZs called it Accompanied Freefall ... which made the most sense to me. Progressive Freefall in most of Canada All similar programs and all tailored to how fast the student learns. I have done hundreds of PFF jumps as a reserve-side instructor (aka training wheel) where my primary task was holding the student stable until they recovered from sensory over-load ... usually 5 seconds after exit. As soon as they announced a (portable) wind tunnel was coming to Vancouver, I refused to do PFF jumps with students before they had a few minutes of tunnel time. Which brings us back to the OP’s question ..... one-on-one PFF/AFF/PAC etc. is fine as long as the student already has some experience in a wind tunnel. After that, the quality of the student is the biggest variable ... followed by the quality of instructor(s).
  23. I have used deep stall to clear a few tension knots on tandems and one line-over on a solo canopy. the technique requires pulling the canopy into a deep stall, straight ahead. When you let the goggles up rapidly, the canopy dives forward and - for a brief few seconds - there is hardly any tension on the suspension lines. This allows tension knots to untie themselves and - on rare ocassions - MIGHT allow a line-over to clear itself. MIGHT!