Subject: Re: [harryproa] Racking loads
From: Rob Denney
Date: 11/21/2010, 7:08 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Great example of what?  I have no idea what their beams are made of, but if they are only sized for lifting the windward hull, they will break if the boat is ever caught seriously aback.  Both boats are owner built and designed, so this may be a risk they are happy with.  As I am selling my designs, it would not be an acceptable risk to me.


Your drawings are both correct, but not what I am referring to, which is the twisting from the forward component of the drive.  This is the force that causes the bow to pitch down (nose diving). 

Pitching  the lee hull bow down, with the rig on it and the windward hull flying (to make it more obvious) puts less twisting loads on the beam than nosediving the lee hull with the mast in the ww hull.  

rob

rob

On Thu, Nov 18, 2010 at 4:56 AM, tsstproa <bitme1234@yahoo.com> wrote:

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