Subject: Re: [harryproa] Hockey Stick Mast
From: "=?UTF-8?B?QmrDtnJu?= bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 10/29/2018, 2:35 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Bernd Kohler has designed something like that. The top is stabilised by a wishbone on his design.
http://www.ikarus342000.com/DUO1000page.htm

I remember also reading an article by him about the design, but can't find it now.

On Mon, Oct 29, 2018, 17:58 Chris Purkiss chrispurkiss@bigpond.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

Hi all.
I’m interested to see the varied discussions on this forum so I thought I would throw up a new idea I have been thinking about for awhile to see if it has legs.

Square top sails.
Have become popular even in cruising cats these days. The problem is the top diagonal batten is a pain to store on the boom or to hoist.
My idea is to install an “end plate” on the top of the mast with a second light weight halyard on the out board end of the hockey stick to control leach twist.

The end plate acts like the little vertical winglet on modern planes to reduce tip vortex. (A T shaped boom does the same thing for the bottom of the sail.) My guess is the end plate would be about 300 mm wide. The length depends on how much leach you want on the sail.

This would do away with the need for most of the full length battens.

Chris Purkiss
M. 0428755749

__._,_.___

Posted by: =?UTF-8?B?QmrDtnJu?= <bjornmail@gmail.com>
Reply via web post Reply to sender Reply to group Start a new topic Messages in this topic (2)

SPONSORED LINKS
.

__,_._,___