DIY Custom Eval Example

You must be signed in to use the DIY Custom Evaluation tool. When entering length and width measurements, change all measurements of inches into Tenths of Feet Example: 3″= .25, 4″= .33, 5″= .42, 6″= .50, 7″= .58, 8″= .67, 9″= .75 So a boat Loa of 35’10” = 35.83

Complete the information requested below notated with asterisks

1. Enter a Title name for your Custom Eval

* MD Custom Eval Test

2  Select Hull Type

* Catamaran

3. Choose US or Metric System;  in this example US Standard is used.  

*US Measurement                                                                         

4. Enter Specification Data. Here is our example data.

*  Loa    35.67  ft/m

*  Lwl    32.08  ft/m

*  SA       632  ft2/m2

*  Boa 19.08 ft/m

 5.  Use Pounds or Long Tons  

This example uses Pounds.

*  Displacement   8131  lbs (lbs, Long Ton or kg )

6.  Do not enter Bcl or Bh data unless you aresure of the measurement

Beam Centerline Bcl 15.77 ft/m

Beam hull Bh    3.31  ft/m 

7. Enter BdCl if known

Bridgedeck Clearance BdCl 20 in

Evaluation Report

Multihull Type: Catamaran

Specifications:

Loa             35.67 ft., 10.87 m
Lwl        32.08 ft., 9.78 m
Boa      19.08 ft., 5.82 m
Bcl        15.77 ft., 4.81 m *
Bh          3.31 ft., 1.01 m *
BdCl               20 in, 50.80 cm 
Disp. 8131.20 lb. 3.63 LT 3688.25 kg
SA                  632 sq. ft., 58.71 m2
Bcl/Lwl          .49
Lwl/Bh            9.69
BdCl v. Nom    -4 in, -10 cm

 

Performance Indicators

SA/D     25.01
BN      1.25
BSpd     9.55 Knots
KSP7.90 Knots 
Texel     129 Seconds

 

Stability Indicators

SSpd  18.04 Knots
KSI30.38 Knots

* If Bh and Bcl had not been known they would have been computed from data entered and our algorithm’s increasing results to 12 computations. 

** For an explanation of terms and a description of formulas please see the Technical page for the article entitled Abbreviations, Definitions, Formulas and Terms.

*** Estimated time to do all calculations using a hand-held scientific calculator is 45 mins.