Q700X 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 0.3850 ft
Trim (FP-AP) 0.0000 Deg
Heel 0.0000 Deg
Volumetric Properties
Volume 5.068 ft^3
Displacement 324.329 lb
Wetted Surface 24.208 ft^2
LCB (Center of Buoyancy from FP) 9.0758 ft
VCB (from Baseline) 0.2350 ft
Draft 0.3869 ft
Waterplane Properties 
Area 19.083 ft^2
LCF (Center of Flotation) 8.9427 ft
VCF (from Baseline) 0.3850 ft
Moment to Trim One Inch 86.8236 ft-lb
Pounds per Inch Immersion 101.7754 lb/in
Change in Displacement per Inch Trim Aft 1.0422 lb/in
il (Longitudinal Inertia about LCF) 282.96876 ft^4
it (Transverse Inertia about TCF) 3.0677848 ft^4
LWL (Length on the Waterline) 17.4552 ft
BWL (Beam on the Waterline) 1.6875 ft
Metacentric Heights
Longitudinal KM 56.0735 ft
Longitudinal GM 56.0735 ft
Transverse KM 0.8404 ft
Transverse GM 0.8404 ft
Form Coefficients
LWL / BWL 10.3436
LWL / Draft 45.1154  
BWL / Draft 4.3617
Cb (Block) 0.4447  
Cm (Midship) 0.7992
Cp (Prismatic) 0.5564  
Cvp (Vertical Prismatic) 0.6864
Cwp (Waterplane) 0.6478