Subject: Re: [harryproa] mast bury
From: "Rob Denney" <proa@iinet.net.au>
Date: 1/26/2007, 7:32 AM
To:
Reply-to:
harryproa@yahoogroups.com.au

G'day,
 
Lots of rules of thumb, depends who you listen to.  On the solo transpac boat the beam bury is 550mm for 8m beams.  This is 1 in 15.4.  Less bury than this and the shear loads in the beam become too high, and require much more material.  Anything less than about 10:1 and I would talk to an engineer about the mast rather than just use beam theory.
 
On Elementarry it is 750mm bury for a 7.5m mast.
 
regards,

Rob
----- Original Message -----
From: Phil Keck
To: harryproa@yahoogroups.com.au
Sent: Friday, January 26, 2007 4:42 AM
Subject: [harryproa] mast bury

On an unstayed rig, is there a rule of thumb on how much bury you need for a given length of mast?
I read on this page:
that "The minimum "immersion" of mast into cabin is about 1 in 7 ie a 35' high mast needs 5' of bury."  Do you really need that much?  What's the bury on elementarry?
Thanks,
Phil


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