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Free!ship IOM Design Toy
Posted: 16 Oct 2006, 02:45
by Mike Pickles
I’ve just spent the best part of today, somewhat selfishly, playing with the “Free!shipâ€
Posted: 16 Oct 2006, 20:11
by Muzza
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!
Posted: 17 Oct 2006, 02:37
by Mike Pickles
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€
Posted: 17 Oct 2006, 07:59
by awallin
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
Posted: 18 Oct 2006, 03:40
by Mike Pickles
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]
Posted: 18 Oct 2006, 18:59
by Mike Pickles
Posted: 19 Oct 2006, 11:21
by spaldi01
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
Posted: 17 Mar 2007, 05:04
by Bernard Boden
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
