• Content

  • Joined

  • Last visited

  • Feedback


Community Reputation

0 Neutral


  • Main Canopy Size
  • Reserve Canopy Size
  • AAD

Jump Profile

  • Home DZ
  • License
  • License Number
  • Licensing Organization
  • Number of Jumps
  • Years in Sport
  • First Choice Discipline
    Formation Skydiving
  • Second Choice Discipline
    Formation Skydiving

Ratings and Rigging

  • Tandem
    Instructor Examiner
  • Pro Rating
  • Rigging Back
    Senior Rigger
  • Rigging Chest
    Senior Rigger

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Jeanice Dolan of Skydive Ocean City (MD), reports 5 years and 15,000 jumps with no malfunctions on their Tandem Sigmas. This involved several Tandem Instructors and a half a dozen rigs.
  2. billbooth

    Why dont reserve PCs have limiter tapes?

    I put the center line tapes, what you called "limiter tapes", in the original hand deployed pilot chute for two reasons: 1. To make the pilot chute open faster. (Without the initial "holding open effect" of a spring, the shapeless hand deployed pilot chute tended to streamer for a second or so.) 2. A pilot chute (or any round) with a pulled down apex creates 11% more drag, and could therefore be make a bit smaller and less bulky. But, opening speed was the main reason.
  3. billbooth

    Semi-Stowless Bags? Mirage?

    When I started jumping, 53 years ago, one of the first things that struck me was how primitive and simplistic stowing lines in rubber bands seemed to be. There just had to be a more modern, technologically better way to do it. I tried everything, but kept coming back to the good old rubber band. It seems that, as usual, the simplest way turned out to be the best way. The "modern" semi-stowless bag is just a re-hash of the original Para-Flite reserve bag, except that we use tuck tabs or magnets instead of Velcro to stow most of the lines in a pouch. But the good old rubber band remains the best way to lock the bag shut. To quote the Bible: "As it was in the beginning, is now and ever shall be...Magnets make for great riser covers, but in this particular game of rock-paper-scissors, it's obvious that rubber bands trounce magnets. Trying to reinvent the wheel is not always a good idea.
  4. billbooth

    2013 Symposium

    Jerry, there are several transit companies that operate that route. One that comes to mind is DOTS (Daytona-Orlando Transit System). All are a lot cheaper than renting a car for 5 days. But then again,you won't be able to easily visit UPT, or any of the other fine parachute manufacturers in DeLand without a car.
  5. billbooth

    Drogue snatch force

    Check the length of the "kill lines". Drogue collapse speed (trap door effect) is controlled by this measurement. The shorter the kill line, the more quickly the drogue collapses, and the longer the trap door effect. Simply tying an overhand knot at the base of the kill line can lower snatch force.
  6. billbooth

    pilot chute snatch force

    Here's a guess...about 75 pounds at 120 miles per hour. It depends on how far the apex is pulled.
  7. billbooth

    Skyhook retro fit "Ratings"

    Sorry. I will get you an answer by tomorrow. Bill
  8. billbooth

    Highest exit speed

    We have tested them at over 250 mph.
  9. billbooth

    cutaway handles

    If I had chosen a D-ring handle for the 3-ring release, it never would have caught on. In fact, coming up with a suitable handle for the 3-ring was harder than coming up with the device itself. When your ripcord handle comes out of the pocket it floats, but the pressure from the reserve pilot chute spring keeps the ripcord pin in place. Not so for a 3-ring. If the handle is knocked loose in freefall, the whole device will likely come apart. Also, low altitude accidental release of your reserve is not as serious as accidental release of your main. I have written here before on this subject, and why the soft handle is more suitable for a 3-ring than for a reserve ripcord.
  10. A mini ring riser on a large harness ring has a little less mechanical advantage than on a small harness ring because the lever arm is less due to the thickness of the large ring. It will work though. Two type 17 (1") mini ring risers in one large harness ring, is an easy way to attach an extra canopy for a breakaway rig. We've done it lots of times with no problem.
  11. billbooth

    Reverse riser discussion

    I have discussed the problems with reversed risers several times before. Do a search...then get rid of them...please.
  12. billbooth


    The "Steven's Lanyard" was an early RSL for FRONT mounted reserves developed by Perry Stevens in the late '60's. It was a long piece of tubular nylon that connected the right main riser directly to the reserve ripcord handle. It worked great, but quite a few people got hit in the face by that departing ripcord handle. This was especially bad if you had a Sentinel Pin-Puller handle that weighed about a pound. The first piggyback RSL I know of, also from the "60's, was designed by Dan Abbot for the original Security piggyback. It was a short piece of tubular connected to the reserve ripcord housing. The housing was connected to the rig with snaps at both ends, and left with the departing main after a breakaway, pulling the reserve pin, but usually leaving the handle in place.
  13. billbooth

    sigma/sigma micron differences

    The military is now using our tandem systems with up to 1,000 lbs., while jumping out of jets at 30,000 feet, so these rigs are made to much high standards than our sport rigs. We have decided to build some of these tougher specs into our sport tandem rigs too. So, the Micro Sigma has a new harness with a main lift webb "pulley" setup that is stronger, makes adjustment easier, but still doesn't slip. (People are putting tandem mains, and even reserves, with no-stretch line into our systems, and this scares me...thus the tougher harness.) The Micro Sigma also has a way more secure main cover flap. There are also a few other subtle changes. All these will soon be built into our other tandem rigs too.
  14. I met Adrian on my third North Pole expedition in 1994. He was an instantly likable, as well as impressive guy, and we have been friends ever since. His re-creation of the da Vinci parachute was brilliant. This is a tremendous loss to all of us. Adrian was a wonderful spokesman for skydiving, as well as a great motivational speaker. (He "wowed" my Rotary Club just last year.) I can't believe I have lost 4 good skydiving friends in less than a year: Gus Wing, Egon, Piers (Plane crash in the Keys), and now Adrian. Please be careful out there guys.