chris morejohn
Junior Member
- Joined
- Apr 14, 2011
- Posts
- 33
- Reaction score
- 10
- Location
- St. Augustine Fla.
Light boats, shallow rudders
Tanton,
Thanks for the reply. Your interior design is excellent for living aboard. I have sailed with Jim Melcher on his Bolger Manatee design before and after he rerigged it with a Bolger mainsail of similar design to yours. The battens were solid wood so were very heavy. When the mainsail was hoisted in a flat calm the boat heeled over 5 degrees. I told Jim it looked like a step backwards for him. He wanted an easier rig- mainsail to handle at his age at upper 70s. Yet he sailed to Cuba and circumnavigated it and back up to Maine. He had the boat shipped to Europe and did the canals again and then sailed it back across the Atlantic via the West Indies and back to Maine in his 80s. So it's back to people sail boats not boats sail people.
Your design will be way stiffer than the Bolger Manatee's hard round bilge design. Also with modern materials in battens the sail can be very light. I have been aboard Pete Hills catamaran a while back with a similar mainsail with articulating soft battens that was fantastic. I also have sailed on my buddys Tanton 43' canoe stern cat ketch with its original wishbone rig and after he rerigged it with Chinese lugged mainsails. The Chinese mains gave similar speeds to the original rig but of course are so fun to reef. The new Chinese mains are lighter than the original wish bone mains.
Jim Melchor built a Bolger Black Skimmer in my boat shop 29 years ago so I got to be part of that build. I am not a fan of building the hull sides in one piece with scarfs or butt blocks in the ply and then lifting up to attach to the bulkheads. To me it takes no time at all to build a proper building jig and then build your boat with double skin at the least. So I agree that the quick and simple way of Bolgers past ideas were great for that time period but with today's costs to build it should be done properly so you have a life time boat. Plywood is not cheap any more.
With my first Sharpie design I built a typical Bolger balanced rudder with an end plate on the bottom. It worked but not at sea. Too shallow at 20" deep for offshore work. I changed it for a kick up rudder that was vertical. Game changer! Total control at all times in all seas. I then went on to log thousands of offshore miles with this rudder design.
In my next designed sharpie "Jubilee" a 40' yawl the rudder was perpendicular to the stern and drew 4'5" down with finger tip control.
On the Black Skimmer if the kick up rudder was not fully down the weather helm was enormous, as it is with all kick up rudders when lifting up. On the Medadow lark it to has to have the rudder as far down as possible or too much helm.
On the HFM I can feel if the rudder down line is off by a 1/2" by the change in helm. Same thing on Rodger Martins Presto . Any boat design that shows a rudder partly kicked up should be looked at with skeptasisim. On Jubalie I designed the bow to be just under the waterline at load. This was a huge mistake as this boat pounded like crazy at anchor. That's why I have never sold plans for this boat as the whole bow area has to be redisigned. This design is a very fast, and stiff sailor but the bow needs to be lower like oh HFM.
Twin rudders work on really wide shallow boat hulls . With a narrowish shallow hull the leeward rudder will be always vulnerable to damage. All twin rudder boats I have seen do not sail in shallow water but lower sails and motor into shallower water. Twin rudders will be continually being named by weeds, lines, lobster pots etc. going over the side at night to cut is no fun in the Caribbean or Maine. When motoring in confined areas at slow speeds with out prop wash you have very little control with these small rudders. All that are designed have to work independently of each other if one is damaged. And I mean quickly. I have sailed a lot on catamarans with center outboard engine sleds up to 53' with 33' beams. Not fun to maneuver. On Open 40s with deep rudders and 8' keels not so bad.
So just some observations and opinions to pass on .
Tanton,
Thanks for the reply. Your interior design is excellent for living aboard. I have sailed with Jim Melcher on his Bolger Manatee design before and after he rerigged it with a Bolger mainsail of similar design to yours. The battens were solid wood so were very heavy. When the mainsail was hoisted in a flat calm the boat heeled over 5 degrees. I told Jim it looked like a step backwards for him. He wanted an easier rig- mainsail to handle at his age at upper 70s. Yet he sailed to Cuba and circumnavigated it and back up to Maine. He had the boat shipped to Europe and did the canals again and then sailed it back across the Atlantic via the West Indies and back to Maine in his 80s. So it's back to people sail boats not boats sail people.
Your design will be way stiffer than the Bolger Manatee's hard round bilge design. Also with modern materials in battens the sail can be very light. I have been aboard Pete Hills catamaran a while back with a similar mainsail with articulating soft battens that was fantastic. I also have sailed on my buddys Tanton 43' canoe stern cat ketch with its original wishbone rig and after he rerigged it with Chinese lugged mainsails. The Chinese mains gave similar speeds to the original rig but of course are so fun to reef. The new Chinese mains are lighter than the original wish bone mains.
Jim Melchor built a Bolger Black Skimmer in my boat shop 29 years ago so I got to be part of that build. I am not a fan of building the hull sides in one piece with scarfs or butt blocks in the ply and then lifting up to attach to the bulkheads. To me it takes no time at all to build a proper building jig and then build your boat with double skin at the least. So I agree that the quick and simple way of Bolgers past ideas were great for that time period but with today's costs to build it should be done properly so you have a life time boat. Plywood is not cheap any more.
With my first Sharpie design I built a typical Bolger balanced rudder with an end plate on the bottom. It worked but not at sea. Too shallow at 20" deep for offshore work. I changed it for a kick up rudder that was vertical. Game changer! Total control at all times in all seas. I then went on to log thousands of offshore miles with this rudder design.
In my next designed sharpie "Jubilee" a 40' yawl the rudder was perpendicular to the stern and drew 4'5" down with finger tip control.
On the Black Skimmer if the kick up rudder was not fully down the weather helm was enormous, as it is with all kick up rudders when lifting up. On the Medadow lark it to has to have the rudder as far down as possible or too much helm.
On the HFM I can feel if the rudder down line is off by a 1/2" by the change in helm. Same thing on Rodger Martins Presto . Any boat design that shows a rudder partly kicked up should be looked at with skeptasisim. On Jubalie I designed the bow to be just under the waterline at load. This was a huge mistake as this boat pounded like crazy at anchor. That's why I have never sold plans for this boat as the whole bow area has to be redisigned. This design is a very fast, and stiff sailor but the bow needs to be lower like oh HFM.
Twin rudders work on really wide shallow boat hulls . With a narrowish shallow hull the leeward rudder will be always vulnerable to damage. All twin rudder boats I have seen do not sail in shallow water but lower sails and motor into shallower water. Twin rudders will be continually being named by weeds, lines, lobster pots etc. going over the side at night to cut is no fun in the Caribbean or Maine. When motoring in confined areas at slow speeds with out prop wash you have very little control with these small rudders. All that are designed have to work independently of each other if one is damaged. And I mean quickly. I have sailed a lot on catamarans with center outboard engine sleds up to 53' with 33' beams. Not fun to maneuver. On Open 40s with deep rudders and 8' keels not so bad.
So just some observations and opinions to pass on .