Free!ship IOM Design Toy

Discuss IOM design, building an IOM, information on suppliers, tuning an IOM, results of recent events, etc

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Mike Pickles
Posts: 15
Joined: 13 Oct 2006, 08:22
Location: Javelin GBR562
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Free!ship IOM Design Toy

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

I’ve just spent the best part of today, somewhat selfishly, playing with the “Free!shipâ€

Muzza
Posts: 30
Joined: 20 Oct 2004, 02:12
Location: USA 274

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!
Murray Buckman
USA 274

Mike Pickles
Posts: 15
Joined: 13 Oct 2006, 08:22
Location: Javelin GBR562
Contact:

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, it’s just something to be aware of.

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

awallin
Posts: 624
Joined: 18 Nov 2003, 06:31
Location: FIN 36
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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
Posts: 15
Joined: 13 Oct 2006, 08:22
Location: Javelin GBR562
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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
Posts: 15
Joined: 13 Oct 2006, 08:22
Location: Javelin GBR562
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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.
Image
Image
Image

spaldi01
Posts: 32
Joined: 16 Jan 2004, 11:23
Location: GBR 1962
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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
Posts: 5
Joined: 17 Apr 2004, 18:48
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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
Mr. Bernard Boden MD
île de la Réunion
Yes Indian Ocean at my windows

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