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Sonnet 17.5 video

Posted: Wed Apr 02, 2008 10:45 am
by Yostwerks
The homebuilt Sonnet 17.5 inflatable / folder / hybrid is 17.5' X 23" (533cm X 58cm)
and is designed for extended touring duties. In the short video clip below, it can be
seen near Dundee, Scotland on a trial run. On the water, it looks and performs like a
proper sea kayak, and not like a typical inflatable. Assembly is under 10 minutes.

The first paddler weighs 220lbs (100kg) , and this shows the remaining "freeboard"
of this high volume design. 100 lbs (45kg) of additional gear is within reason as
the designed pounds per inch ( 2.5cm) immersion rate is nearly 100 lbs. ... 1/16:39:04


Posted: Wed Apr 02, 2008 11:30 am
by Romainpek
nice boat... :)

Posted: Wed Apr 02, 2008 11:08 pm
by Yostwerks
nice boat...
Thanks...Let me know how the double performs :)


Posted: Thu Apr 03, 2008 7:12 am
by Christov_Tenn
It looks a lot more rigid than I would have expected.

Posted: Thu Apr 03, 2008 9:17 am
by Yostwerks
It looks a lot more rigid than I would have expected.
The Sonnet's holds their shape well in the water, but there is flex, and that's a good thing.

The key is having 2 sponsons per side, with a single 3/4" side stringer wedged
between them . When inflated, the sponsons press against the tube, and the result
assured rigidty, and shape. The greater the sponson's diameter, the more rigid the
frame. The round lower sponsons provide a multi-chine cross section shape. These
are low pressure folding kayak type sponsons, so they require no hand pump or
expensive valves.

The keel is also a 3/4" tube, though none of the 3 stringers connect to each other at the
stems. In other words, you can't assemble the frame free standing like a normal folder
as it's nothing more than 3 independent tubes, and that's the key to it's rapid assembly.
In addition, assembly is in-skin, with no zippers or flaps to leak, meaning that the skin is
as watertight as a Feathercraft. - Sonnet 16 Assembly


Re: Sonnet 17.5 video

Posted: Sat Jan 07, 2017 3:12 pm
by Dryboater
Hi I am interested in building the Sonnet 17.5 but the link to the video does not seem to work. Does anyone have any information and pictures on the completed product? Thanks, Chris

Re: Sonnet 17.5 video

Posted: Sun Jan 08, 2017 12:43 am
by siravingmon
Tom unfortunately stopped being around a while back, bur fortunately his good work is preserved on a mirror site here:

Re: Sonnet 17.5 video

Posted: Sun Jan 08, 2017 9:40 am
by Dryboater
Thanks, I feared as much. Unfortunately the does not contain a working link to a completed Sonnet 17.5 nor the also interesting 14-6 and since the demise of Folbot it seems very difficult to locate commercially produced sponsons. Tom himself I believe once remarked that if he thought his home built sponson designs worked better than the Folbot ones he would be using them. If anyone has any good ideas on where to source proper sponsons I would be glad of them.