Re: Martha Jane leeboard mount

Thank you!
That's good to hear.
Oddbjorn
I retrofitted my JochemsSAPPHIRE,with those specific quick release clamcleats when I owned her. They worked perfectly...can recommend them as a simple solution...

Regards,
Doc Musekamp

On Sun, Oct 18, 2015 at 12:43 AM, Oddbjørn Jonassenoddbjorn.jonassen@...[bolger]<bolger@yahoogroups.com>wrote:

Duckworks is marketing a clamcleat which releases automaticlly. The load limit is adjustable. I have not seen or tryed it but I intend to use it on my William D. Jochems witch I am slowly building.


http://www.duckworksbbs.com/hardware/cleats/sd002570/index.htm

Kind regards
Oddbjorn


Duckworks is marketing a clamcleat which releases automaticlly. The load limit is adjustable. I have not seen or tryed it but I intend to use it on my William D. Jochems witch I am slowly building.

http://www.duckworksbbs.com/hardware/cleats/sd002570/index.htm

Kind regards
Oddbjorn
....without looking at the discussion we wrote up on the MJ modifications, one option would be to integrate a section of rubber-strap/bungee-cord between board and that cleat.
For instance, between two cheek-blocks on deck a block on that board down-haul rope would be attached to this rubber-strap/bungee-cord, having this expanding element allow for ‘give’ in the routine-case of ‘depth-sounding’ by leeboard.
There would be different conceivable on-deck geometries to set up this permanent ‘expansion-spring’ to control the down-haul.
This does not look like much fiscal or installation-dramatics.
Should be readily doable as an experiment.
Too bad I have no sizable leeboarder on-hand myself to share a YouTube flic with this geometry in action...

Susanne Altenburger, PB&F     
 
Sent:Friday, October 16, 2015 9:19 AM
Subject:[bolger] Re: Martha Jane leeboard mount
 
 

Thanks for all of your help, including individual emails to me. Now I have a much better idea of what Bolger intended. I have also reviewed the plans for Meadowlark in L F Herrshoff's "Sensible Cruising Designs", which uses leeboards..

BTY, my experience with a dual lee boards on both a Dovekie and Michalak's Raider, and a single leeboard on my NormsBoat is that the boards can be neutral in weight and lowered by using a downhaul, which is NOT cleated. The board is held down by just friction, and 1/8 of a turn on the nut can make a noticeable difference. Once under way, water pressure on the lee side holds the board down.

I use my leeboards as "depth sounders" on the sandy-bottomed Chesapeake Bay, so tying off the downhaul could have unfortunate consequences.

Norm

Thanks for all of your help, including individual emails to me. Now I have a much better idea of what Bolger intended. I have also reviewed the plans for Meadowlark in L F Herrshoff's "Sensible Cruising Designs", which uses leeboards..

BTY, my experience with a dual lee boards on both a Dovekie and Michalak's Raider, and a single leeboard on my NormsBoat is that the boards can be neutral in weight and lowered by using a downhaul, which is NOT cleated. The board is held down by just friction, and 1/8 of a turn on the nut can make a noticeable difference. Once under way, water pressure on the lee side holds the board down.

I use my leeboards as "depth sounders" on the sandy-bottomed Chesapeake Bay, so tying off the downhaul could have unfortunate consequences.

Norm

Phil Bolger's Boats
34259 Re: [bolger] Re: Matha Jane

(revised)
==cut and paste of text from MAIB below===
https://groups.yahoo.com/neo/groups/bolger/conversations/messages/34259


Mike's MJ pics show much of the leeboard mountshere
http://mkstocks.tripod.com/boats/martha_jane/trailer/index.htm


A not yet complete test splash under ob power MJ vid also showing leeboard mountshere
http://mkstocks.tripod.com/boats/martha_jane/motor_test/clip2.mpg


Some MJ finished/launched views with leeboards and pendants visiblehere
http://mkstocks.tripod.com/boats/martha_jane/launch/index.htm


Full size MJ plans !! ;)

Phil Bolger's Boats

There are breakaway cleats that you set to a certain tension.

On Oct 15, 2015 3:14 PM, "Kentkent@...[bolger]" <bolger@yahoogroups.com> wrote:

Using a downhaul for the leeboard, instead of ballast, is an interesting
idea. It seems like it might be easier to make. But if the board hits
an obstruction, it can't swing out of the way. I suppose the downhaul
could be secured with some arrangement that holds it firm against water
resistance, but allows it to move if it's pushed harder.

Any thoughts?

Thanks -- Kent

On 10/15/2015 3:17 PM, Mark Albanesemarka97203@...[bolger] wrote:
>
>
> This is from MAIB June 15, 2000.
>
> The revised leeboard design, developed over several years will correct
> the tendency of the original leeboard to kite off the hull. The new
> leeboard design allows both boards to be left down on all points of
> sailing, and precise adjustment of their position, independant of each
> other, for control of helm balance and steering steadiness. For
> instance, with one board down vertical or raked forward, and the other
> raked aft to the partly hoisted position, the boat will tend to hold her
> course with free tiller for useful periods. With the pendant and
> downhaul arrangement of control, the boards need no ballast, eliminating
> the lead inserts and making them lighter to raise.
>
>
>

Using a downhaul for the leeboard, instead of ballast, is an interesting
idea. It seems like it might be easier to make. But if the board hits
an obstruction, it can't swing out of the way. I suppose the downhaul
could be secured with some arrangement that holds it firm against water
resistance, but allows it to move if it's pushed harder.

Any thoughts?

Thanks -- Kent


On 10/15/2015 3:17 PM, Mark Albanesemarka97203@...[bolger] wrote:
>
>
> This is from MAIB June 15, 2000.
>
> The revised leeboard design, developed over several years will correct
> the tendency of the original leeboard to kite off the hull. The new
> leeboard design allows both boards to be left down on all points of
> sailing, and precise adjustment of their position, independant of each
> other, for control of helm balance and steering steadiness. For
> instance, with one board down vertical or raked forward, and the other
> raked aft to the partly hoisted position, the boat will tend to hold her
> course with free tiller for useful periods. With the pendant and
> downhaul arrangement of control, the boards need no ballast, eliminating
> the lead inserts and making them lighter to raise.
>
>
>
On my Surf there's an interesting arrangement where the board will work on either side of the boat.  I switch it to the windward side before tacking.  The net result is that while the boat is heeled about 10 degrees onto the chine (where a dory likes to sit) the board will be nearly vertical.  The board has to be symmetric for this to produce lift to windward but it works great on this dory (about 18' x 3')

A

On Thu, Oct 15, 2015 at 2:21 PM, Chief Redelkchiefredelk@...[bolger]<bolger@yahoogroups.com>wrote:

Mark, that is interesting. I've seen photos of boats with 2 leeboards before but have never used more than one on the short boats I own. But now I am thinking 2 may be nice on a 12 footer. Maybe balance the boat for different sail rigs. Thanks. Chief

On Oct 15, 2015 3:17 PM, "Mark Albanesemarka97203@...[bolger]" <bolger@yahoogroups.com> wrote:

This is from MAIB June 15, 2000.

The revised leeboard design, developed over several years will correct the tendency of the original leeboard to kite off the hull. The new leeboard design allows both boards to be left down on all points of sailing, and precise adjustment of their position, independant of each other, for control of helm balance and steering steadiness. For instance, with one board down vertical or raked forward, and the other raked aft to the partly hoisted position, the boat will tend to hold her course with free tiller for useful periods. With the pendant and downhaul arrangement of control, the boards need no ballast, eliminating the lead inserts and making them lighter to raise.



On Thu, Oct 15, 2015 at 12:11 PM,norman.wolfe@...[bolger]<bolger@yahoogroups.com>wrote:

Does anyone have a photo or drawing of the revised Martha Jane leeboard mounting? I have heard that it calls for a bolt (like Michalak specifies) rather than a rope. Thanks. Norm Wolfe.




Mark, that is interesting. I've seen photos of boats with 2 leeboards before but have never used more than one on the short boats I own. But now I am thinking 2 may be nice on a 12 footer. Maybe balance the boat for different sail rigs. Thanks. Chief

On Oct 15, 2015 3:17 PM, "Mark Albanesemarka97203@...[bolger]" <bolger@yahoogroups.com> wrote:

This is from MAIB June 15, 2000.

The revised leeboard design, developed over several years will correct the tendency of the original leeboard to kite off the hull. The new leeboard design allows both boards to be left down on all points of sailing, and precise adjustment of their position, independant of each other, for control of helm balance and steering steadiness. For instance, with one board down vertical or raked forward, and the other raked aft to the partly hoisted position, the boat will tend to hold her course with free tiller for useful periods. With the pendant and downhaul arrangement of control, the boards need no ballast, eliminating the lead inserts and making them lighter to raise.



On Thu, Oct 15, 2015 at 12:11 PM,norman.wolfe@...[bolger]<bolger@yahoogroups.com>wrote:

Does anyone have a photo or drawing of the revised Martha Jane leeboard mounting? I have heard that it calls for a bolt (like Michalak specifies) rather than a rope. Thanks. Norm Wolfe.


This is from MAIB June 15, 2000.

The revised leeboard design, developed over several years will correct the tendency of the original leeboard to kite off the hull. The new leeboard design allows both boards to be left down on all points of sailing, and precise adjustment of their position, independant of each other, for control of helm balance and steering steadiness. For instance, with one board down vertical or raked forward, and the other raked aft to the partly hoisted position, the boat will tend to hold her course with free tiller for useful periods. With the pendant and downhaul arrangement of control, the boards need no ballast, eliminating the lead inserts and making them lighter to raise.



On Thu, Oct 15, 2015 at 12:11 PM,norman.wolfe@...[bolger]<bolger@yahoogroups.com>wrote:

Does anyone have a photo or drawing of the revised Martha Jane leeboard mounting? I have heard that it calls for a bolt (like Michalak specifies) rather than a rope. Thanks. Norm Wolfe.



Does anyone have a photo or drawing of the revised Martha Jane leeboard mounting? I have heard that it calls for a bolt (like Michalak specifies) rather than a rope. Thanks. Norm Wolfe.