free-lance designer, in business since 1975

"We didn't all use them, but I was one who did. When I had a problem on tow behind a Moyes' tug, I went for it and it worked flawlessly!"

Jim Zeiset
Jan, (Green Team) at the Hay Tow meet, Australia

"NOTHING works better than the Linknife."
Jeff Sinason
Former Region 6 Director

The light weight, low cost, sure fire, place anywhere,
Tow Release for Hang Gliders and Paragliders

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THE LINKNIFE cuts the weaklink. It's independent of any tow forces and works the same with too much or too little towline tension. Notice how the O-ring slides down bringing the blades to the string. Use for main or backup release for all types of hang glider and paraglider towing.

COSTS:

Linknife — $20 each + shipping.
Club/dealer discounts available.

Bridles (aero or static), include Linknife,
rapid links and setup instructions

Convenient Ordering:

Note: Using PayPal is very simple. You do NOT need to be a member of PayPal to make a purchase. You may use a credit card like any other system. If your order is to be shipped outside the US, if you'd like a customized autograph, or prefer to pay by check, please contact me.

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LINKNIFE - USA
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US orders (1-9) @ $20.00 each + $1.50 shipping.

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Quantity orders (10+) @ $15.00 each + $5.00 shipping per lot of 10.
Use PayPal's "Send Money" option or drop me a note and we'll work it out.
THANKS.

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LINKNIFE - CANADA
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US orders (1-9) @ $20.00 each + $7.00 shipping.

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Other orders – please write with your specifics for quantity
and shipping method. Use PayPal's "Send Money" feature for
the total amount. (Recently sent 10 to Turkey.)

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BRIDLES – Static Line Towing and Aerotowing
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All bridles are made from red 900-pound heat set and stretched braided dacron with woven and hand-sewn loops in the ends. Measurements are what I've found to work; if you have a different need, gimme a call.

Static Line Tow Bridle - aka: 2:1 Hewett Center of Mass Bridle
SEE BRIDLE PAGE or STATIC LINE PAGE

For foot launch towing with a static or payout winch. Kit contents include:
(A) Main line is 22' loop-to-loop.
(B) Waist line is 3' which allows tying an overhand loop knot to keep the shackle, self-locking carabiner or whatever you choose, from sliding side-to-side.
(C) Keel line is a 6' length of plain bridle material without finished ends, for you to tie however works best for your glider.
(D) Four (4) 1/4" rapid links
(E) Linknife Release with extra O-ring.

COST: $70.00 + $5.00 mailing to US addresses.

Kit does not include the static tow waist bridle release mechanism (such as sailboat shackle) or release pull string as there are too many optional ways of setting this up. Custom bridles are available; please call or write with your specifications.

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Aerotow Bridle - 1:1 V-line
SEE AEROTOW PAGE

For aerotowing via foot or dolly launch. Kit contents include:
(A) Main V-line is about 8' loop-to-loop.
(B) Chest bridle is 3' long and attaches to one end loop of the main bridle with a larkshead knot or, if the release is placed at the keel, a secondary/backup release can be placed here.
(C) Keel line is a 6' length of plain bridle material without finished ends, for you to tie however works best for your glider.
(D) Two (2) 1/4" rapid links for at the bridle apex and attaching the main bridle at the keel,
(E) Two (2) 1/8" rapid links for attaching the chest bridle to the harness shoulder loops
(F) Linknife Release with extra O-ring.

COST: $55.00 + $5.00 mailing to US addresses.

Kit does not include the release pull string as there are too many optional ways of setting this up. Custom bridles are available; please call or write and let's see what can be done.

Use PayPal's "Send Money" option for easiest payment.

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or send check to:
Birren Design Company
502 Shadywood Lane
Elk Grove, Illinois 60007
P: 847/640-0171
E: Email

DISCLAIMER: As with all aviation endeavors, your choice and use of equipment is totally up to you. It is assumed you are an experienced HG or PG tow pilot who is intimately familiar with the style of towing you will be doing. As such, YOU ASSUME ALL RISK AND LIABILITY in the use of the Linknife, as well as all other parts, functions and personnel involved in the towing and flight operations. If you do not have experience in towing, please contact an instructor for expert training. Trying to learn on your own can, and probably will, result in your injury and even death. Many pilots have paid the ultimate price so we may now tow as safely as never before possible. Please learn from their lessons.

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Convenient Ordering:

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