Subject: Re: [harryproa] My Little Mule (sketch)
From: Dennis Cox
Date: 8/23/2010, 6:39 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Hi Doug,
 
I wanted the rudders out pretty far and I wanted the beams to be just outside those to help transmit the rudder loads.  With this three beam design there is almost no torsion of the lee hull.  Helps since its of relatively week lauan.  Since its doesn't have to racking loads and the trigulation resists all the in-plane shear loads it should be a very stiff and strong structure without resorting to exotic materials or lots of fiberglass.  But... I didn't factor any thinking for the trampoline.  I just assumed the triangle... 8' x 9' wouldn't be an issue.  But then I've never made one.  Is there one?
 
Thanks,
Dennis

From: Doug Haines <doha720@yahoo.co.uk>
To: harryproa@yahoogroups.com.au
Sent: Sun, August 22, 2010 9:29:09 PM
Subject: Re: [harryproa] My Little Mule (sketch)

 

Hi Dennis,

Nice.
How about the netting/trampoline? Maybe splay those outside beams less.

Doug

--- On Sun, 22/8/10, Dennis Cox <dec720@att.net> wrote:

From: Dennis Cox <dec720@att.net>
Subject: [harryproa] My Little Mule (sketch) [1 Attachment]
To: harryproa@yahoogroups.com.au
Date: Sunday, 22 August, 2010, 18:43

 

This is my current thinking... although, I want to re-check my numbers based on Rick's last message about using an aspect ratio of 7 to 8 and see if how much I can reduce the size of the rudders.  Since I have no way of doing a non destructive rudder strike, I will be evaluating that some.  Its configured to articulate the hulls and I have some ideas to restrict that motion, but they're not in the drawing.  Windward hulls been analyzed with Godzilla is about 10% more drag than a semi circle cross section... again... hopefully, can get it planing early and overcome that deficiency.  Can always sit on back of windward hull (with the articulation) raise the nose to encourage planing.  With the big flat bottom, expect it won't be too difficult.  Although it will be a bumpy ride!

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