## Mast Bury

Expand Messages
• I vaugely remember reading somewhere that Phil Bolger had a rule of thumb for calculating the minimum mast bury for a freestanding mast. Does this ring a bell
Message 1 of 8 , Sep 1, 2006
I vaugely remember reading somewhere that Phil Bolger had a rule of
thumb for calculating the minimum mast bury for a freestanding mast.
Does this ring a bell with anyone? Thanks.

-Mike
• I don t know what Bolger suggests, but I think the standard figure is 10% of the overall length minimum, which is what Jock McLeod reccomended for unstayed
Message 2 of 8 , Sep 1, 2006
I don't know what Bolger suggests, but I think the standard figure is 10% of
the overall length minimum, which is what Jock McLeod reccomended for
unstayed junk rigged masts.

Gary
----- Original Message -----
From: "dvacanti" <mike_vacanti@...>
To: <bolger@yahoogroups.com>
Sent: Friday, September 01, 2006 11:15 AM
Subject: [bolger] Mast Bury

>I vaugely remember reading somewhere that Phil Bolger had a rule of
> thumb for calculating the minimum mast bury for a freestanding mast.
> Does this ring a bell with anyone? Thanks.
>
> -Mike
>
• ... I suspect that Bolger just eye ball estimates what looks right. He almost always has the foot of the mast resting at the bottom of the boat and the mast
Message 3 of 8 , Sep 1, 2006
On 9/1/06, dvacanti <mike_vacanti@...> wrote:
>
> I vaugely remember reading somewhere that Phil Bolger had a rule of
> thumb for calculating the minimum mast bury for a freestanding mast.

I suspect that Bolger just 'eye ball' estimates what looks right.

He almost always has the foot of the mast resting at the bottom of the
boat and the mast partner as high up as practical, at deck height, and
often up at the sheer line, or even higher with recent tendency
favoring tabernacles.
• The 10% number sounds familiar, thanks for the replies. -Mike ... is 10% of
Message 4 of 8 , Sep 1, 2006
The 10% number sounds familiar, thanks for the replies.

-Mike

--- In bolger@yahoogroups.com, "Gary Lepak" <gnjlepak@...> wrote:
>
> I don't know what Bolger suggests, but I think the standard figure
is 10% of
> the overall length minimum, which is what Jock McLeod reccomended for
> unstayed junk rigged masts.
>
> Gary
• The most extreme I have noticed is Fast Motorsailer, page 324 in Boats with an Open Mind. Bury scales to about 20 for a 19 -11 mast, or about 8%. The mast
Message 5 of 8 , Sep 1, 2006
The most extreme I have noticed is Fast Motorsailer, page 324 in Boats
with an Open Mind. Bury scales to about 20" for a 19'-11" mast, or
about 8%. The mast step is on deck and the partners at the top of the
pilot house. There is a lot of area on that mast too, a 265 square
foot dipping lug.

Doug

--- In bolger@yahoogroups.com, "Bruce Hallman" <bruce@...> wrote:
>
> On 9/1/06, dvacanti <mike_vacanti@...> wrote:
> >
> > I vaugely remember reading somewhere that Phil Bolger had a rule of
> > thumb for calculating the minimum mast bury for a freestanding mast.
>
> I suspect that Bolger just 'eye ball' estimates what looks right.
>
> He almost always has the foot of the mast resting at the bottom of the
> boat and the mast partner as high up as practical, at deck height, and
> often up at the sheer line, or even higher with recent tendency
> favoring tabernacles.
>
• I had a very short bury in a small scow I designed. It used Bolgers 59sf LOM sail from Teal. The step was a plug glued and bolted to a block on the bottom. A
Message 6 of 8 , Sep 2, 2006
I had a very short bury in a small scow I designed. It used Bolgers
59sf LOM sail from Teal. The step was a plug glued and bolted to a
block on the bottom. A 2-inch pvc tube extends about 8 inches above
the deck to accept the mast. Sailing on a very brisk day put too mych
strain on the plug and sheered it from the block, The bolt held it
somewhat so no major damage occured. The fix was to install a proper
step which encircled the mast tube and had more glue area and
fasteners. I was concerned that the short bury would put a heavy load
on the mast at the partner, hence the tube to try to spread the load.
The leverage of the sail force against the plug sheered it. The plug
step and tube worked fine on my Teal but it has about twice the bury.

Joe T

In bolger@yahoogroups.com, "Gary Lepak" <gnjlepak@...> wrote:
>
> I don't know what Bolger suggests, but I think the standard figure
is 10% of
> the overall length minimum, which is what Jock McLeod reccomended for
> unstayed junk rigged masts.
>
> Gary
> ----- Original Message -----
> From: "dvacanti" <mike_vacanti@...>
> To: <bolger@yahoogroups.com>
> Sent: Friday, September 01, 2006 11:15 AM
> Subject: [bolger] Mast Bury
>
>
> >I vaugely remember reading somewhere that Phil Bolger had a rule of
> > thumb for calculating the minimum mast bury for a freestanding mast.
> > Does this ring a bell with anyone? Thanks.
> >
> > -Mike
> >
>
• I take it that a tabernacle fastened to the keel and the mast fastened to the tabernacle would count as a single mast for these purposes - an thinking of
Message 7 of 8 , Sep 2, 2006
I take it that a tabernacle fastened to the keel and
the mast fastened to the tabernacle would count as a
single mast for these purposes - an thinking of
counterweighted masts for bridge clearance purposes
Cheers
Andy Airey

___________________________________________________________
Try the all-new Yahoo! Mail. "The New Version is radically easier to use"  The Wall Street Journal
http://uk.docs.yahoo.com/nowyoucan.html
• Mast bury when using a tabernacle might be considered to be pivot point to lock pin. Additional support in the tabernacle might be arranged by more pins /
Message 8 of 8 , Sep 2, 2006
Mast bury when using a tabernacle might be considered to be pivot
point to lock pin. Additional support in the tabernacle might be
arranged by more pins / crossbars, etc but then lowering / raising the
mast would take a bit longer.

Bottom support to top support in the tabernacle would be bury.
Tabernacle strength would be another ( related) matter.

Sharpie

--- In bolger@yahoogroups.com, ANDREW AIREY <andyairey@...> wrote:
>
> I take it that a tabernacle fastened to the keel and
> the mast fastened to the tabernacle would count as a
> single mast for these purposes - an thinking of
> counterweighted masts for bridge clearance purposes
> Cheers
> Andy Airey
>
>
>
> ___________________________________________________________
> Try the all-new Yahoo! Mail. "The New Version is radically easier to
use"  The Wall Street Journal
> http://uk.docs.yahoo.com/nowyoucan.html
>
Your message has been successfully submitted and would be delivered to recipients shortly.