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Cirrus SLT - Stitch & Glue
(plywood, hard chine)
Technical specs...

 Classic, hard chine 'Greenland style' touring kayak sized for children, teenagers and small paddlers.






       

Cirrus SLT description | MATERIALS | S&G Kits

CirrusLargest (original) version of this kayak model
Cirrus LT Medium displacement version of this kayak model
The Cirrus SLT shown here features a full recessed cockpit with integral knee braces.
The recess plate is a do-it-yourself option and not available in the kit. The kit contains the plans templates but not the plywood for the recess plate. Also, normal plans contain the templates and allow construction of either style of cockpit.

Building Materials
PropertyEnglishUnitsMetricUnitsComments
Length Overall 14.5 ft 4,41mlength from bow to stern as designed
Beam Overall 20.955 in 53,2cmwidest part of kayak
Draft 3.384 in 8,59cmbaseline to Designed Water Line (DWL)
Volumetric Properties
Displacement 152 lb 69,09kgat DWL
Volume 2.375 ft^3 67,2litersdisplacement in cubic feet and liters of sea water
Wetted Surface 15.456 ft^2 1,43m^2underwater surface area to DWL
LCB 6.97 ft 2,12mlongitudinal center of buoyancy from x=0
LCB % LWL53.24%53,24%LCB as a percetage of waterline length from x=0
VCB2.14 in 5,43cmvertical center of buoyancy from baseline
Waterplane Properties
Waterplane area 12.97 ft^2 1,205m^2at DWL
LCF 6.79 ft 2,07mlongitudinal center of flotation from x=0
LCF % LWL51.86%51,86%LCF as a percetage of waterline length from x=0
LWL 13.1 ft 3,993mlength of waterline; same as DWL
BWL 19.00 in 48,27cmbeam of waterline
Sinkage 69.19 lb/in 12,38kg/cmpounds displaced per one inch of sinkage
Form Coefficients (no units, same for metric)
Cb 0.405    block
Cm 0.777   midship
Cp 0.522   prismatic
Cwp 0.625    waterplane
Area/Displacement8.682   Area / Displacement ratio [ft^2/(ft^3)^2/3]
Length / Beam8.273   Length / Beam ratio [LWL / BWL]
Miscellaneous
Area of cockpit 2.25 ft^2 0,209m^2for cockpit template in plans (red)
Circumference 5.75 ft 1,48mcockpit
Depth in front 10.75 in 27,3cminside cockpit
Depth in rear 8.4 in 21,3cminside cockpit
Depth in front 9.875 in 25cminside recessed cockpit (optional)
Depth in rear 7.25 in 18,4cminside recessed cockpit (optional)
Deck area 18.23 ft^2 1,484m^2includes cockpit area
Hull area 24.4 ft^2 2,267m^2 
Kayaker Fit & LoadingSmall size paddlers
88 lb min. -> 120 lb ideal -> 145lb max. (40 -> 54,5 -> 66kg)
Recommended max. load: 177lb ( 80,4kg)
Paddler height: 5' 6" and under (167 cm and under)
x=0 the start of waterline (DWL) at bow

All English units (ft / in) in the plans have a Metric (m / cm) eqivalent !

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Material

  Plywood
Unit converter
Metric / Standard unit converter

The minimum required plywood amount for the Cirrus SLT hull is 3 half sheets - 2' x 8' x 4mm marine plywood (60.96cm x 243.84cm x 4mm) or similar. If shop space doesn't allow scarfing of 24' (7,31m) long plywood sections, I recommend 4 half sheets which can be scarfed in pairs of 16' length. The minimum plywood for the deck is the 3 half sheets but only 3mm thickness is required.
NOTE: Minimum three scarf joints are required for the whole project. The kayak hull plates will all fit on 3 joined half sheets and the deck plates on 2 joined half sheets plus a single unscarfed half sheet.
Both deck and hull can be built with up to 6mm plywood thickness.
Minimum plywood thickness for hull: 4mm
Minimum plywood thickness for deck: 3mm (1/8")

 Notes & Tips:
  • What is Marine Plywood?
  • If you desire to make the kayak from different plywoods (more than one wood type/color), more sheets will be required. For example the dark deck plates of the Cirrus are made from Sapele veneer plywood which required one additional half sheet of plywood.
  Fiberglass coverage
assumes complete coverage of inside and outside of hull and deck to make full sandwich core
 
Coverage of fiberglass
(plain weave e-glass)		yards
(yd) 		feet
(ft) 		meters
(m) 		How to estimate
Deck - 4 oz. e-glass10.7 9,8two times the kayak length + 1 yard (1m)
Hull - 6 oz. e-glass 10.7 9,8two times the kayak length + 1 yard (1m)
2"- 3" wide glass tape 6720,4four times the kayak length + 9 ft (3m)

Notes & Tips:
  • Minimum width of fabric is 30" - will not allow for full hull abrasion patch
  • Order 50" width of the 4oz. glass to get the extra hull abrasion patch material
  • If 50" fabric is not available, order one 'waterline length - LWL' of additional cloth (any weight)
  • Round figures to the nearest higher number when ordering fabric
  • The 6oz. glass can always replace the 4oz.
  • See different types of reinforcement fabrics
  • Glass tape is sold in 'feet' and cloth in yards (in the US)
  • Glass tape is used to bond the kayak shells and for additional stem reinforcement
 Epoxy
 Minimum total volume of epoxy mix (resin + hardener): 1.5 - 2 gallons

Notes & Tips:
  • Usage may vary (+-) 0.5 gallon as a result of the thickness of lay-up, fillet size, unused batches, spills, bad (unmixed) batches, care in application (overapplication), additional composite components such as coamings, hatch seals, rudders etc...
  • If epoxy is sold by weight, the density of epoxy is very close to water (1dm3 = 1 liter = 1kg)
  • 1 gallon = 3.8 liters
  • Learn about epoxy

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Vaclav Stejskal
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           USA
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Last page update: 9 May 2024