NEW NETTING MAKES TRAMPOLINES TOUGHER

Story by Matthew Dunning / May 11, 2017

I had the occasion last summer to construct a deployable aft trampoline for my catamaran Boondock. Hang on a second, did I just say aft trampoline? Well, Boondock is a special case. I describe her as a Northwest interpretation of a Polynesian voyaging multihull. She is a 54′ open bridgedeck cat with central cockpit, a ketch rig, and an aft trampoline.

I load my dinghy onto Boondock’s aft tramp when underway so the tramp needed to be very abrasion resistant. The tramp also carries my kicker as well as my crew when tending the mizzen, relaxing out of the breeze, clambering aboard or playing fetch with the dog at anchor. So the trampoline had to be strong and comfortable. And with Boondock’s slender sterns, it needed to be an open weave to drain a pooping wave with ease. This is quite a list of functions to ask from a trampoline material. Thankfully, advances in fiber technology allowed me to replace Boondock’s old netting with a durable, strong, comfortable and deployable working trampoline.

Peter’s Marine up in Port Townsend welded up a rigid aluminum frame for the tramp and for the mesh I turned to the netting used on both America’s Cup boats.. Luckily their supplier, Net Systems (www.Net-Sys.com), manufactures and supplies the world’s fishing fleets with net from right here on Bainbridge Island. In addition to their usual clientele, Net Systems’ new Ultra Cross Silver ® netting is showing up on advanced multihulls around the globe including both BMW-Oracle and Alinghi. The big cat and tri use it with good reason when they need to span their 90′ beams. Ultra Cross is woven from Dyneema ® fibers – the strongest, lightest weight fibers ever made. And Dyneema ® happens to have very good UV and abrasion resistance properties. The strength of Net Systems’ Ultra Cross is incredible and the engineering is top-notch. Knots are eliminated, braids are balanced and filaments run continuously through the netting so that strength is maximized in every direction. Each 1/8th inch 4-strand twine has a breaking strength of approximately 862 lbs.

I toured the factory and the machines that knit the netting are fantastic to behold. They look vaguely like upright jet turbines spinning out 7/8ths inch open weave netting sheets 100 mesh count wide. 100 7/8ths mesh expands to cover an area about 10′ wide. Ultra Cross Silver can be ordered in a variety of lengths but always the 10′ widths. Larger sheets can be made bTrampoliney lashing two sheets with Dyneema ® twine.

Ultra Cross is very adaptable for multihull trampolines. On Boondock I gathered three mesh worth around the perimeter of my trampoline and lashed the mesh to the aluminum frame with Dyneema ® twine. I cut the Ultra Cross netting with a hot knife and used ½ inch Amsteel ® (line also made with Dyneema ® and with a breaking strength of over 20,000 lbs) to create the living hinge at the front of the trampoline and for the lifting lines led through stern cleats to the cockpit winches. In a normal static forward tramp installation the Ultra Cross would be lashed to a perimeter rope of Amsteel or to perimeter battens which would lash in turn to the hull and beam attachments.

The Ultra Cross is silver in color and tinges a bit gold over time as binding agents used in the weaving process are exposed to UV (I have been assured this is not a degradation of the fibers). The harmonious metallic color of the netting goes with almost any color scheme and looks very sharp. Ultra Cross has a waxy feel and conforms to people and objects kind of like a very tight hammock. I will often get up from a siesta on the aft tramp and see my imprint. Even with a very taught installation the qualities of the weave and low stretch materials seem to give it some memory. This cradling feels good against the skin for a 7/8″ weave. I think the absence of knots and the somewhat slippery texture contribute to a nice feel. Sunbathers might want to lay down a towel to prevent wafflemarks though.

I am very happy with Ultra Cross and have negotiated special pricing for clients of The Multihull Company. If your trampolines are in need of renewal you can order 10′ x 5′, 10′ x 10′, 10′ x 15′ or 10′ x 20′ sheets of Ultra Cross Silver directly from Net Systems. Call 800-722-5568 and give them the code: MULTIHULLUC and you will receive a 20% discount. Tell them Matthew sent you.

 

Recent News

We take pride in our happy customers

Great to deal with and very patient in our questions. They were able to find us the perfect vessel for our needs.

— Ray Hunt

Andrew was nothing less than AWESOME! He was helpful and knowledgeable before, during, and after the sale. He went above and beyond to make sure we completed the sale efficiently and also helped see us off for safety.

— Jeff McKnight

I wanted to acknowledge how wonderful it was to work with Josie Tucci. Having her represent us as a buyer’s broker was such a breath of fresh air. She was extremely ethical every step of the way and her knowledge was expansive. She didn’t just want to get the sale/commission, she wanted to make sure we knew exactly what we were taking on and supported us in getting full transparency from the seller. I cannot recommend her enough!

— Laura Folks

Cal Landau went above and beyond taking care of issues that came up during the listing. I can’t say enough.

— Thomas Hall

CHRIS DID A GREAT JOB TAKING PICS AND INFO ABOUT THE BOAT AND REPRESENTED IT WILL. THE SALE COMPLETED WITHIN 3 MONTHS OF LISTING!

— Greg Nordstrom

See All Testimonials

Trust & ExpertiseAbout Us

Successful relationships cannot exist without it. At The Multihull Company we base every relationship on a firm commitment to earning and retaining our client’s trust.

Advice of any kind is valuable only when grounded in hard-won expertise. It too, must be trustworthy. Trust and expertise define the heart and soul of The Multihull Company. We are a team of skilled professionals who thrive on providing expert, trustworthy advice and service to catamaran and trimaran sailors around the globe.

Read More

Follow us @themultihullcompany