Terence

[Terence]

11.95m LOA 3.3T displ

[Terence]

I am running Delftship Professional v9.20
I have tried saving as a part and exporting to FreeShip 2.6 and FreeShip plus but without success. Nor am I able to save my Delftship model into FreeShip.
My purpose is to utilise the Freeship cross curve function.

Any suggestions anybody?

[Terence]

using 3 lines as suggested

Attachments:

• 11Mchineunderhungrudderreversetransom7h15.jpg

[Terence]

using 3 as suggested

[Terence]

[Terence]

1) I will post some more as you suggest 100Kb max
2) The book is available in PDF free online , message me direct and I’ll send you the link or a copy
3) Chines are easier to build in my opinion, having a hard chine at the waterline sneaks a little more water line beam without much extra displacement and so increases righting moment. It is planing and surfing where I am concerned, Eliasson and Larsson refer to chines and planing strakes as a way avoiding increased wetted area by deflecting and disattaching the flow creeping up the hull sides in high speed conditions. A hard chine also seems to give directional stability at high speed.
4) I have been looking at the Vendee Callengers and Class 40s and aft chines may well be the way to go, just I havent mastered the transition on the software without getting an ugly bulge in the middle of the boat.

[Terence]

the picture fell off 🙁

[Terence]

Suggestions welcome especially regarding stability calculations and VPP. I would also be interested in thoughts on merits of hard chine or soft chine especially down wind in planing conditions. I believe this boat will full plane in 20kts tws or less. with 160 m2 sail area.

[Terence]

been playing around with FreeShip for a couple of years and read up on Larsson and Eliasson Elements of Yacht Design plus a whole lot of stuff on the net.
I have a sailed for many years and built 2 boats.
This is my idea for a budget fast short handed 11m performance yacht using medium tech materials.
displacement is just under 3T in light ship mode.
The chines are at the 15 deg waterline for stability and ease of steering especially down wind under auto pilot as well as simplifying
construction.
the prismatic coefficient is high at .64
with a sail area to displacement of around 35 and a displacement to waterline length of 70 she should still go in the light
mast is alloy, sail plan is a self tacking jib backed up with a code 0 for the light and a roachy main, assymetric spinnaker downwind

ballast ratio of 55% in a bulb with 2.3m draft will make for a stiff yacht with strong upwind performance

other dimensions are
LOA 11 m
BMAX 3.3m
LWL 10.5 m
Bwl 2.2m

RM1deg 125 KgM

[Terence]

current project

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