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Design & Illustration

Spindrift – Jon Myers

Spindrift – Jon Myers

Hi Bjorn,

Just thought I would send you some completed photos of the Ski. 

Thank you very much for the plans, the boat is beautifully designed and is a delight to paddle.

Thanks again
Jon 

Spindrift – Jon Myers

Kommentarer

Hi Jon - congratulations with the completion of a great looking craft! From the colourbond fence on your photo, I gather that you might be living in Australia? I was wondering how you sourced the material for your boat? Did you take Bjorn's plans (or computer files) to a timber supplier here in Australia? I'd be very interested in your experience as I am hoping to build one of Bjorns designs in the coming year(s). I live on the Hawkesbury near Sydney. Cheers, Matthias

Hi Bjorn, I really like your designs and the beautiful craft people have built from them, including this Spindrift. I have only been paddling (flatwater) since 2018 and have much to learn as a paddler, but I am hoping to build a wooden kayak or ski in the next few years, possibly as a retirement project :). I currently paddle a Vadja Civet Cat (https://australianpaddlesports.com.au/product/vajda-k1-civetcat/), which is like a K1 with training wheels! I would like to build a kayak or ski with similar stability. I really like the Frej, the Spindrift, Spray and the Panthera. Would these models be appropriate for my level of experience and age (fairly fit 60-er)?

I don't have boat building experience, but am fairly confident with hand tools and general carpentry, I've owned and maintained wooden sailing dinghies, and built a wooden framed strawbale house as my master project so far; would that be a reasonable experience base to take on a kayak building project?

Thanks a lot for your time.

Best wishes,

Matthias Boer

North-Richmond, NSW, Australia

First, a wood strip kayak is a very manageable project and would be a walk in the park with your experience ;-)

Of the kayaks you mention, Spindrift would be close to the Vajda in stability – less beam is compensated by length and more rocker (lowers the CG). But since you don't mention the most important criteria for choosing a kayak (how and where you intend to use it) – it is difficult to say anything relevant about them. But in short, Frej, Spray, and Panthera are more stable than the Vajda, in initial stability and even more in secondary. None of them are as fast as Vajda on flatwater, all of them faster in wind and waves. For touring in different conditions on open sea you might want to include Njord in your list (fast, efficient, and with easy movements in).

Otherwise, the main difference is that Frej and Njord are skeg kayaks (highly maneuverable, using an adjustable skeg to fine-tune tracking), while Panthera, Spray, and Spindrift are rudder-dependant surfskis/sea kayaks (using an efficient rudder system to control both turning and tracking – which give them an edge surfing big waves). None of them is of the old traditional sea kayak type (hard tracking and needing a rudder to turn).

Many thanks, Björn. I paddle mostly for fitness and to enjoy the outdoors. I would probably use the future boat mostly on flat water (Hawkesbury River), but would probably like to expand to wider parts of the rivers and estuaries we have along the NSW coast.

I also forgot to mention my weight and height: 66 kg and 178 cm.

As to the building materials, I gather they should be available from local shops and any precise cutting would be done from computer files that can be purchased with your plans?

Thanks again.

Best wishes,

Matthias

Hi Matthias,

Yes, the materials are usually available locally. Strips (fir, spruce, cedar, paulownia, etc) can be square cut or bead-and-cove as per the building manual. Station molds and stems are available as dwg files if wished – may save a little time, cost a little more, and does not affect the final finish of the kayak (depends primarily on what happens later in the process ;-). Stations are cut in particleboard, plywood, MDF, or similar, while stems often are solid wood.

The kayaks are designed for paddlers slightly heavier than you, so it may be a good idea to shorten them slightly (as advised on the plans), to not float unnecessarily high on the water. But it is not a big problem – your Vajda is designed for the same weight as my kayaks are ;-)

Hi again, Björn. A few years on from my previous inquiries, I am now approaching semi-retirement and can start preparing the building of a wooden surfski. I hope to start building in October 2024. Since my previous inquiries I have progressed as paddler and have a better understanding of the type of ski I would like to build. I'm still 66 kg, 178 cm tall and always paddle on flatwater (which can be quite choppy when tide and wind go in opposite directions!), both for training and ~8 km races.

I have a preference for a ski over a kayak, because I often paddle alone on the Hawkesbury River and like the idea that it wouldn't fill with water if I fall in and can recover by myself. For the last 2.5 years, I have paddled an entry level surfski (MAZU 55: https://www.surfskiwarehouse.com/products/mazu-55) on flatwater. I am now at a stage that I am ready to 'graduate' to a slightly more advanced ski and I am hoping that your Spindrift design would be a good match. I trialled a (beautiful!) Nordic Squall 580 on flatwater and was reasonably comfortable in it. Would Spindrift have a similar feel in terms of stability/speed to the Squall 580, or could the design be tweaked to suit my weight and paddling level/needs?

I have found a timber yard that sells Paulownia and was wondering how much I could reduce the weight of a Spindrift by building it from Paulownia instead of another timber like fir. Assuming wood densities of ~280kg/m3 for Paulownia and ~415 kg/m3 for fir, how much could that difference in wood density reduce the weight of the ski?

Finally, I am wondering how to build the cockpit. I'd like a carbon fibre cockpit but wonder how I'd get a good mold for a comfortable cockpit like that of the Squall 580.

Thanks a lot for your time.

Greetings from North Richmond (NSW)

Hi Mattias

I would say that Squall 580 and Spindrift are reasonably alike in stability, speed, maneuverability etc. The hulls are similar in configuration (I was involved in the first stages of the Squall development), and the dimensional differences may work both ways. Spindrift is longer which means a higher top speed and slightly more initial stability, the less beam also adds some speed potential but robs the stability advantage of the LOA, and a couple of kg:s extra lessens the speed advantage while increasing the stability (even with Paulownia it is hard, if not impossible, to match the professional construction methods of NK). All in all, I’d say that they would feel a bit differently but perform quite similarly.

The advantage of Paulownia is, of course, the low density, the disadvantage is considerably less compression and tensile strength (the most important numbers for kayak building). The numbers indicate typically approx half of the comparable numbers for spruce, slightly lower also than black poplar, while double that of balsa. It might result in a weight reduction of about 2,5-3 kg on a Spindrift. But note that both species vary wildly depending on soil, temp zone, where in the trunk the planks are taken etc.

Now, the wood is a core material and part of the structural properties in the hull comes from the epoxy/fiberglass layers – which suggests that it wouldn’t be a good idea to also reduce the weight of the cloth (which anyway wouldn’t contribute to more than a couple of hg:s in weight reduction).

The cockpit can be made in several ways. The drawings have lines for a generic cockpit that may serve as is, or as a starting point for a customization. One way is to fill the cockpit area in the (taped together) hull/deck with a foam material (a number of ground isolation panels) and carve out the cockpit to suit, then laminate the final cockpit in that mold, discard the foam and glue the cockpit into the finished hull.

Another way is measurements taken from a comfortable and functional commercial cockpit to use as a starting point.

Some builders have made a full mold of a commercial cockpit and laminated their own on this mold (place the surfski on a level and stable support), cover the cockpit with plastic, laminate a few layers of fiberglass/epoxy over it, put a big waterfilled plastic bag in to force the laminate in contact with the seat, when cured stabilize the mold with some glued in wooden sticks and lift it out).

Björn

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