Q400X Hydrostatic Data

Resistance Data - Using KAPER by John Winters

KAPER is a mathematical performance prediction program designed by John Winters exclusively for the design and evaluation of small lightweight human powered water craft. It is based on over 200 ship, boat and model tests of light displacement, shallow draft, low Beam/Length ratios and refined to suit tank test data from both canoes and kayaks.

The first edition of KAPER was created in 1989 and limited to high beam/length ratios common to canoes. It was based upon Admiral David Taylor's formula for ship resistance modified to suit low Displacement/Length ratio hulls and canoe test data. After many permutations the existing program was refined to its current state in 1996. You may have seen the KAPER data in the kayak reviews in Sea Kayaker Magazine.

Input Parameters
BL-WL Distance at Amidships 0.3320 ft
Trim (FP-AP) 0.0000 Deg
Heel 0.0000 Deg
Volumetric Properties
Volume 3.9070 ft^3
Displacement 250.0450 lb
Wetted Surface 20.6080 ft^2
LCB (Center of Buoyancy from FP) 7.6362 ft
VCB (from Baseline) 0.2023 ft
Draft 0.3378 ft
Waterplane Properties 
Area 16.991 ft^2
LCF (Center of Flotation) 7.4591 ft
VCF (from Baseline) 0.3320 ft
Moment to Trim One Inch 60.2974 ft-lb
Pounds per Inch Immersion 90.6201 lb/in
Change in Displacement per Inch Trim Aft 0.4185 lb/in
il (Longitudinal Inertia about LCF) 163.42775 ft^4
it (Transverse Inertia about TCF) 3.3856352 ft^4
LWL (Length on the Waterline) 14.5252 ft
BWL (Beam on the Waterline) 1.9090 ft
Metacentric Heights
Longitudinal KM 42.0323 ft
Longitudinal GM 42.0323 ft
Transverse KM 1.0689 ft
Transverse GM 1.0689 ft
Form Coefficients
LWL / BWL 7.6088
LWL / Draft 42.9994  
BWL / Draft 5.6513
Cb (Block) 0.4171  
Cm (Midship) 0.7633
Cp (Prismatic) 0.5464  
Cvp (Vertical Prismatic) 0.6807
Cwp (Waterplane) 0.6128