Category Archives: Building Technique

48 DAYCHARTER CAT UPDATE

Finished up and sent off to Buffalo NY, one 48×28 day charter catamaran. About 14 months with a crew of three plus an occasional fourth. Here are some pix – some text and vids to follow. Three sets of images, the crossbeams, the daggerboards and trunks, and the hulls.

heres a little video of turning over a hull: https://youtube.com/shorts/sbAoR5XPQ_g?feature=share

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Giant Vacuum Bags

These sealable mattress sized vacuum bags work great. You can put parts as large as a mattress in them, run the vacuum for a couple of minutes and seal it. The vacuum was still intact the next day. Unlike the Ziplock Spacebags.

Mattress Vacuum Bag, Sealable Bag for Memory Foam or Inner Spring Mattresses, Compression and Storage for Moving and Returns, Leakproof Valve and Double Zip Seal (Queen/Full/Full-XL)

Brand: Homie3.8 out of 5 stars 1,053 ratings


List Price:$35.99$35.99 Details
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Size: Queen/Full/Full-XL

  • Queen/Full/Full-XL$23.99
  • Twin/Twin-XL$18.99
  • Full$22.99
  • King$25.99
  • California King$26.99

SizeQueen/Full/Full-XL
MaterialPlastic
BrandHomie
Closure TypeZipper
Fabric Type100%, 5 Mil Thick Plastic

About this item

  • 100%, 5 Mil Thick Plastic
  • βœ… 𝗦𝗛π—₯π—œπ—‘π—ž 𝗬𝗒𝗨π—₯ 𝗠𝗔𝗧𝗧π—₯π—˜π—¦π—¦ – Compress your foam or inner spring mattress with vacuum seal technology to the original size it came packed to you. This makes moving and returning it super easy! Works with mattresses from Casper, AllsWell, Zinus, Tuft & Needle, Helix, Linenspa, Purple, Nectar, Leesa, etc.
  • βœ… π—¦π—”π—©π—˜ π— π—’π—‘π—˜π—¬ π—ͺπ—›π—œπ—Ÿπ—˜ π— π—’π—©π—œπ—‘π—š 𝗒π—₯ π—₯π—˜π—§π—¨π—₯π—‘π—œπ—‘π—š – Mattresses can be a pain to move or return, they are big and bulky. By compressing the mattress you can save on moving costs by not having to rent a truck to move it. Just move it in your car for free!
  • βœ… π—”π—œπ—₯π—§π—œπ—šπ—›π—§ 𝗣π—₯π—’π—§π—˜π—–π—§π—œπ—’π—‘ – The airtight seal protects your mattress against moisture, dust and dirt. With a double zip seal, this mattress bag ensures a good seal.
  • βœ… π—₯π—˜π—¨π—¦π—”π—•π—Ÿπ—˜ π—•π—”π—š – With proper care, this bag can be reused for multiple moves as it is made with durable components. This will save you a bunch of money in the long run.
  • βœ… 𝗗𝗨π—₯π—”π—•π—Ÿπ—˜ π—£π—Ÿπ—”π—¦π—§π—œπ—– – This bag is made with durability in mind, it is 125 microns or 5 mil thick to ensure reliability.

Compare with similar items

48″ Day charter project

Hi! I’m starting the build of a kurt hughes design day charter cat to be completed spring 2022 in southwest florida. it will be a cylinder molded wood composite build. I’d like to communicate with anyone else who is currently building, or has built a similar boat. i’m a professional boat builder, having built and worked on several of kurts designs.

couple of questions:

  1. anybody have a suitable dagger board mold? or want to use mine when i’m done with it?
  2. any good leads for sourcing rudder shafting?
  3. if anyone needs uni or triax i have found somebody with a couple tons nearby (sarasota area). vectrix and very reasonably priced. let me know in the comments and i’ll post info.

10m power cat update

At the end of 2018 I posted a power cat hull build. Upon completion of the two hulls, they were picked up by the owners and taken home to Maine to build the crossbeams and cockpit, as well as fit engines, electrical, etc. I’m happy to report that the resulting boat looks spectacular, and the owner/builders say that the shakedown cruise went well, with a smooth dry 20 knots. stock props.

here is the link to the original post: https://multihullblog.com/building-power-cat-hulls/ and here is the link to the design: http://multihulldesigns.com/designs_stock/28cat.html

Plastic for vacuum bagging

Ten years ago, most visqueen used to be of fairly high quality and it wasn’t hard to walk into home depot and walk out with a roll of plastic good enough for bagging. But at some point cheap, porous, recycled visqueen took over the market, which is fine for most uses but ridiculously bad for vacuum. Good polyethylene sheeting will be somewhat transparent, and smooth texture. I recently ordered a roll of Xpose Safety 4.5 mil through amazon, and it was inexpensive, and excellent. i bagged 7′ x 18′ curved foam roof panels on a 3cfm vac pump and got a nice hard vacuum with not much attention to detail. https://www.amazon.com/gp/product/B07PBXHWFB/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

the Best Weatherstripping

I think that I have tried every kind of weatherstripping to seal door closures or wet hatches. This model, called Rubber seal, ribbed, seems to be the best I have ever tried. All are adhesive backed. The ribs allow one part to deflect, without distorting the whole seal like a square section would. The black one is 3/8β€³ thick, from Grainger. https://www.grainger.com/product/TRIM-LOK-INC-Rubber-Seal-10D149

The white one is at Home Depot. They don’t carry black. I think is 5/16β€³ thick.

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Composite Chainplates

I recently had to review a chainplate on one of my COI cats and send a note to the USCG.
I see from the X-Ray report that the Aolani chainplates were not steel, but composite as I thought they were.
These composite plates are immune to corrosion, unlike metal ones.
I assume the builder used my layup schedule as I have sent earlier. I see no reason to doubt that.
They are easy for the builders to build in a huge safety factor.
Instead of being fastened onto a hull, these synergistically combine to both strengthen the hull and the chainplate.
Unlike the metal plates, these have some resiliency so make all the parts longer lived.
Any delta in the parts from the loads would show up immediately and early by cracks in the paint. Unlike metal plates which usually are not painted.
Attached find a picture of one of my other catamaran designs with composite chainplates. Note that he lifts his entire vessel with only the three chainplate locations.

Building power cat hulls

I took on the job of building a set of hulls for Kurts 28’ power cat design which we stretched to 31’ by adding about 2.5 inches to every station. We upped the stringer size by 30% and glassed with 8oz rather than 6oz but otherwise stuck with the plan and laminate schedule. We used multiple layers of 8 and 10oz to make up biax tapes, i find it makes for easier fairing and allows for tapering the buildup. We did a half-way-to-yacht quality fairing job, primed with 545 and installed cleats, hatches, fuel tanks, and fuel fills. There will be lightweight 25 hp engines mounted on rear transoms. We finished both hulls and shipped to the owner in maine, who is going to build the cross arms and center cockpit over the winter. I really can’t recommend committing to building a boat over the summer in sarasota, florida in a non-airconditioned space, but, in the spirit of running a marathon, and other ridiculously painful ways to enjoy yourself, we did it.Β  Total build time, including purchasing, hardware, and mounting on a trailer for shipment, was in the neighborhood of a thousand hours. LOTS of pictures after the break-

Stringers

Continue reading Building power cat hulls