Siskiwit Bay Multi-Chined Kayak Plans for Plywood Building
Description: The Siskiwit Bay MC is all-around fast mid-sized British-style touring kayak designed for plywood building. This kayak suits a medium to heavy paddler looking for good initial stability and with increased flare above the waterline lots of secondary stability. As the water gets rougher, this kayak feels more stable. It’s a fast design slightly more efficient than most British kayaks in its class. Designed by Bryan Hansel.
Experimental: Since the Siskiwit Bay plans became available on the Internet, I’ve received requests for a plywood version of the kayak. The SB was originally designed as a multi-chined boat for plywood building using the excellent HULLS software. I’ve taken the original file and used Delftship Pro to clean it up and fair the lines. From this cleaned up original file, I’ve produced a dxf and a text file of offsets. These are available for plywood builders. A deck is included, but it is extremely experimental. The stems should also be rounded. Round the stems with a 2″ radius, but, please, contact me before you do this.
Note: I don’t know if it has been built yet.
Hydrostatics: Generated for 295 pounds, which is the number used for Sea Kayaker Magazine’s reviews. (195 pound paddler + 45 pound kayak + 55 pounds of gear).
Design Name: Siskiwit Bay MC
- Design length17.000ft
- Design beam1.757ft
- Design draft: 0.417ft
- Length on waterline: 14.908ft
- Beam on waterline: 1.649ft
- Displaced volume: 4.741ft3
- Wetted surface area: 21.075ft^2
- Displacement: 0.132tons
- Block coefficient: 0.3805
- Waterplane coefficient: 0.5243
- Prismatic coefficient: 0.4837
- Vert. prismatic coefficient: 0.7259
- Midship coefficient: 0.7868
- Longitudinal center of buoyancy: 7.878ft
- Longitudinal center of buoyancy: -4.171%
- Vertical center of buoyancy: 0.248ft
- Waterplane center of floatation: 8.000ft
- Entrance angle: 2.481Degr.
- Transverse moment of inertia: 2.431ft^4
- Longitudinal moment of inertia: 159.45ft^4
- Transverse metacentric height: 0.761ft
- Longitudinal metacentric height: 33.882ft
- Longitudinal center of effort: 7Â .803ft
- Vertical center of effort: 0.233ft
KAPER: KAPER is a resistance program used by Sea Kayaker Magazine for their reviews. SK uses a weight of 250 pounds plus the weight of the kayak to calculate the resistance. It is provided here at the same weight for comparative purposes.
- 1 knot – 0.24
- 2 knots – 0.87
- 3 knots – 1.81
- 4 knots – 3.35
- 4.5 knots – 4.66
- 5 knots – 6.87
Drawings: Two formats are available. DXF and offsets in text.
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April 8th, 2009 at 9:57 am
Very cool. Thanks Bryan for making this available. The only problem is that now I have yet another boat to add to my list of boats to consider building!
Cheers,
Bryan S.
April 21st, 2009 at 3:12 pm
Thanks, Bryan. If you build it, let me know. I’ll be interested in seeing if the multi-chine hull retains the same charm as the rounded version.
April 28th, 2009 at 4:07 pm
Hi
Is it possible to have the file with the developped plates who you show upside?
I can’t open the DXF developpements because I can’t save it on my computer.
Thanks
May 14th, 2009 at 1:31 pm
It is ok now,it was a computer problem.
Thanks for this nice kayak
May 28th, 2009 at 11:14 am
How did you make the developable plates from the original delft dxf to CAD
May 28th, 2009 at 11:15 am
I mean did you make the plates in Delft or CAD. Dalft only develops 3 of 4 of my strakes.
May 28th, 2009 at 11:31 am
I used Delftship to export the developments to a dxf file.
You have to make sure your panels are set to be developable in the layer menu, and you should also make sure that your error rate is low. Ideally, you’ll want panels that develop in one try and with a zero error rate. Running your control grid perpendicular across the panels helps.
May 28th, 2009 at 12:39 pm
Cool Thanks. I am using freeship it wont let me dxf the plates
May 28th, 2009 at 2:59 pm
It should have a save as dxf button in the development panel.