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Cirrus - Stitch & Glue
(plywood, hard chine)

Technical specs...


 Classic, hard chine 'Greenland style' touring kayak for medium to large paddlers.







        Hybrid Plywood

Cirrus description | MATERIALS | S&G KITS

Cirrus Hybrid Wood strip deck version of this kayak model
Cirrus LTSmaller displacement version of this kayak model
Cirrus SLT Smallest displacement version of this kayak model



Click on pictures for a large, detailed version. More pictures in the "Stitch and Glue" gallery.
Building Materials

PropertyEnglishUnitsMetricUnitsComments
Length Overall 17.5 ft 5,33mlength from bow to stern as designed
Beam Overall 22 in 55,87cmwidest part of kayak
Draft 4 in 10,15cmbaseline to Designed Water Line (DWL)
Volumetric Properties
Displacement 222.8 lb 101,25kgat DWL
Volume 3.48 ft^3 98,54litersdisplacement in cubic feet and liters of sea water
Wetted Surface 19.9 ft^2 1,84m^2underwater surface area to DWL
LCB 8.467 ft 2,58mlongitudinal center of buoyancy from x=0
LCB % LWL53,52%53,52%LCB as a percetage of waterline length from x=0
VCB2.526 in 6,41cmvertical center of buoyancy from baseline
Waterplane Properties
Waterplane area 16.07 ft^2 1,49m^2at DWL
LCF 8.25 ft 2,51mlongitudinal center of flotation from x=0
LCF % LWL52.2%52,2%LCF as a percetage of waterline length from x=0
LWL 15.82 ft 4,821mlength of waterline; same as DWL
BWL 19.45 in 49,42cmbeam of waterline
Sinkage 85.71 lb/in 15,33kg/cmpounds displaced per one inch of sinkage
Form Coefficients (no units, same for metric)
Cb 0.407    block
Cm 0.777   midship
Cp 0.524   prismatic
Cwp 0.626    waterplane
Area/Displacement8.66   Area / Displacement ratio [ft^2/(ft^3)^2/3]
Length / Beam9.75   Length / Beam ratio [LWL / BWL]
Miscellaneous
Area of cockpit 2.96 ft^2 0,275m^2for cockpit template in plans (red)
Circumference 6.76 ft 2,06mcockpit
Depth in front 12 5/8 in 32,06cminside cockpit
Depth in rear 10 in 25,4cminside cockpit
Deck area 19.75 ft^2 1,835m^2includes cockpit area
Hull area 32.056 ft^2 2,978m^2 
Kayaker Fit & LoadingMedium to large size paddlers
150 lb min. -> 210 lb ideal -> 250lb max. (68,2 -> 95,5 -> 113,75kg)
Recommended max. load: 270lb (122,8 kg)
Paddler height: 6' 2" and under (188 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 hull is 3 half sheets - 2' x 8' x 4mm marine plywood (60.96cm x 243.84cm x 4mm) or similar. The minimum plywood for the deck is the same but only 3mm thickness is required. If building the whole kayak from 4mm thickness you need three full 4' x 8' sheets.

S&G KIT for the Cirrus with all wood components is avialable as well.

Notes & Tips:
  • What is Marine Plywood?
  • If you desire to make the kayak from different plywoods, 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
 
Coverage of fiberglass
(plain weave e-glass)
yards
(yd)
feet
(ft)
meters
(m)
How to estimate
Deck - 4 oz. e-glass12.7 11,6two times the kayak length + 1 yard (1m)
Hull - 6 oz. e-glass 12.7 11,6two times the kayak length + 1 yard (1m)
2" wide glass tape 7924four times the kayak length + 9 ft (3m)

Notes & Tips:
  • Minimum width of fabric is 38" - will no 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): 2.5 to 3 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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Last page update: 27 June 2014