Subject: Re: [harryproa] mast bury
From: "Rob Denney" <>
Date: 1/29/2007, 7:32 AM

Didn't just cross oceans, survived at least one roll over capsize as well.  

----- Original Message -----
From: Peter Southwood
Sent: Friday, January 26, 2007 4:41 PM
Subject: Re: [harryproa] mast bury

The short answer is no, but the loads are inversely proportional to the bury. Less bury, higher loads.It is possible to engineer a rig where the mast has no bury at all and is bonded onto a flange mounted on the deck. Something like this was done about 20 years ago by Richard Glanville (here my memory may fail me, so dont quote me on this) If I remember correctly the monohull "Nissan Skyline" had an unstayed rotating wing mast on a stub axle which had a flange attached to the deck by rails and could be moved fore and aft for balance. a lot of carbon rovings were involved, and the flange was a fairly massive piece of structural laminate, but it crossed oceans.
----- Original Message -----
From: Phil Keck
Sent: Thursday, January 25, 2007 10:42 PM
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?

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