Free!ship IOM Design Toy

Mike Pickles · Post by **Mike Pickles** » 16 Oct 2006, 02:45

Iâ€™ve just spent the best part of today, somewhat selfishly, playing with the â€œFree!shipâ€

Muzza · Post by **Muzza** » 16 Oct 2006, 20:11

Looking good Mike.

As you play with it a bit more, you might want to reduce the freeboard a little. You seem to have plenty to spare at present.

The tumblehome is classic early 1970s IOR.

Great stuff!

Mike Pickles · Post by **Mike Pickles** » 17 Oct 2006, 02:37

Yes, you're right.

It appears that when you fire up a new drawing you are asked to enter some basic parameters like length, beam, draft plus the number of stations and horizontal build lines (buttocks I think)
It then uses a default boat based on those settings for you to modify.
I guess because of the scaling issues it provides 25% more freeboard than you actually need.
Easy enough to change, itâ€™s just something to be aware of.

Still very much at the â€œwonder what this button does?â€

awallin · Post by **awallin** » 17 Oct 2006, 07:59

does freeship have hydrostatic calculation built-in ?
if not, is there a free program that could do hydrostatics ?

some years ago I did hydrostatic calculations for a number of IOM hulls, they are at:
http://www.anderswallin.net/2005/06/iom ... rostatics/
but they were done with commercial software...

Anders

Mike Pickles · Post by **Mike Pickles** » 18 Oct 2006, 03:40

does freeship have hydrostatic calculation built-in ?

Yes it does.
God knows what it all means but it certainly seems to produce all sorts of numbers,

for example,

Design length : 1.000 [m]
Length over all : 1.000 [m]
Design beam : 0.222 [m]
Beam over all : 0.212 [m]
Design draft : 0.054 [m]
Midship location : 0.500 [m]
Water density : 1.000 [t/m3]
Appendage coefficient : 1.0000
Volume properties:
Displaced volume : 0.003 [m3]
Displacement : 0.003 [tonnes]
Block coefficient : 0.2807
Prismatic coefficient : 0.5000
Vert. prismatic coefficient : 0.5028
Wetted surface area : 0.148 [m2]
Longitudinal center of buoyancy : 0.485 [m]
Longitudinal center of buoyancy : -1.598 [%]
Vertical center of buoyancy : 0.036 [m]
Midship properties:
Midship section area : 0.007 [m2]
Midship coefficient : 0.5614
Waterplane properties:
Length on waterline : 0.951 [m]
Beam on waterline : 0.195 [m]
Waterplane area : 0.124 [m2]
Waterplane coefficient : 0.5582
Waterplane center of floatation : 0.452 [m]
Entrance angle : 5.354 [degr.]
Transverse moment of inertia : 0.000 [m4]
Longitudinal moment of inertia : 0.005 [m4]
Initial stability:
Transverse metacentric height : 0.122 [m]
Longitudinal metacentric height : 1.625 [m]
Lateral plane:
Lateral area : 0.033 [m2]
Longitudinal center of effort : 0.534 [m]
Vertical center of effort : 0.033 [m]

Mike Pickles · Post by **Mike Pickles** » 18 Oct 2006, 18:59

Still needs some smoothing out and the deck, foils drawn but this is a copy of the Noux2 taken by inporting the drawing as a background in Freeship and using it as a template.

spaldi01 · Post by **spaldi01** » 19 Oct 2006, 11:21

Wow, I have just had a play with this software and it appears to be very good although I am still getting to grips with it. The only problem I have had with it is that it calculates displacement in Kg which is not really accurate enough. Very good starting point for new designs however

Chris

Bernard Boden · Post by **Bernard Boden** » 17 Mar 2007, 05:04

Hello

topic for french speakers

a young person's guide to freeship
In french 37Mo wmv

freeship free version here

New and no more free(pro) Delfship here

Samples on the pro pages here

one IOM design sample

and an other tutorial in french
how to use it from a 3 vues plan
and
From Hulls (chine hulls design) to freeship, then rhino
and more
a K I S S tutorial

Tropicaly yours