Custom Evaluation Example



Below is an example of the specification data needed to complete a Custom Evaluation and the type of results you will receive.


Choose Measurement System

1. First  choose US or Metric Sytem;  in this example US Standard is used                                                                                

* US Measurement

 

Enter Custom Data

 2.  Next  choose multihull type.  In this example Catamaran  was chosen.                  

*  Multihull Type: Catamaran

 

 

 

Specification Data

 

3.  Then  complete the boxes with asterisks indicating required information. Here is our example data.

                                                                     

*  Loa    35.67  ft/m

 

*  Lwl    32.08  ft/m

 

*  Boa    19.08  ft/m

 

*  SA        632  ft2/m2

 

   BdCl       20  in./cm*

*(Bridgedeck Clearance is not a required entry but it will not be evaluated unless data is entered)

 

 

 

4.  Put a mark  in the circle next to the abbreviation for Long Tons =  LTON's  if Long Tons entered. 

 

This example uses pounds so LTONs is not chosen and left unselected.

 

Displacement Unit  __   if LTONs entered  .

          

*  Displacement   8131  lbs/Kg or LTONs (if selected)

 

 

5.  Do not enter Bh and Bcl data unless you are sure of it

 

Bh      3.31  ft/m 

                                                                        

Bcl    15.77  ft/m

 

 

Here is the 10 Point Custom Evaluation Report from the above example

 

Green Color indicates 10 results computed from input data

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.

  •       3.63 LT
  • 8131.20 lb.
  • 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

PI-C      

    .79

Texel     

   122

 

Stability Indicators

SI-CM       

  2.77

SSpd     

18.22 Knots

 

* If Bh and Bcl had not been known they would have been computed from data entered and our alogrithms 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 held scientific calculator is 60 mins.