Q500X 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 0.3750 ft
Trim (FP-AP) 0.0000 Deg
Heel 0.0000 Deg
Volumetric Properties
Volume 5.071 ft^3
Displacement 324.5130 lb
Wetted Surface 23.9020 ft^2
LCB (Center of Buoyancy from FP) 8.4974 ft
VCB (from Baseline) 0.2267 ft
Draft 0.3741 ft
Waterplane Properties 
Area 19.172 ft^2
LCF (Center of Flotation) 8.4023 ft
VCF (from Baseline) 0.3750 ft
Moment to Trim One Inch 77.2935 ft-lb
Pounds per Inch Immersion 102.2492 lb/in
Change in Displacement per Inch Trim Aft 1.2988 lb/in
il (Longitudinal Inertia about LCF) 235.07587 ft^4
it (Transverse Inertia about TCF) 3.7595425 ft^4
LWL (Length on the Waterline) 16.3000 ft
BWL (Beam on the Waterline) 1.8415 ft
Form Coefficients
LWL / BWL 8.8513
LWL / Draft 43.5712  
BWL / Draft 4.9226
Cb (Block) 0.4515  
Cm (Midship) 0.8231
Cp (Prismatic) 0.5486  
Cvp (Vertical Prismatic) 0.7070
Cwp (Waterplane) 0.6387