ballast

Hi all, I'm working on what is supposedly a little inshore Pilot cutter called Doris, built in Milford Haven in 1917. I'm not entirely sure she worked as a pilot, she has been registered in the 30s as such with lloyds but her size is quite yachty. She's not been in the water for a long time...

Has anyone tried solid state battery technology employed in the keel of a boat or ship to add ballast and also provide electrical power for propulsion? The batteries can be used to power electrical motors installed in parallel with diesel engines for extended range and fuel economy. There are...

Hello, I am considering adding some extra keel bolts to secure the external ballast on my 1960 Rhodes Swiftsure project boat and am hoping for some general thoughts/advice on my situation and plans. Last summer when I removed the rudder, I found the rudder shoe to have been severely damaged by...

Dear all, I am trying to estimate the resistance added from a bulb on a sailing yacht in upright resistance. I have bare hull resistance calculated from maxsurf resistance I have calculated appendage added resistance with the methods described in the book "Aero-Hydrodynamics and the...

Hello Guys, I am new here. I am currently doing a academic project about a container vessel. Can you guys please tell me how can I determine the required fresh water for a vessel? Is there any empirical formula? I would be grateful to you, if you kindly tell me the procedure to calculate this.

My boat, a 1960 Rhodes Swiftsure 33, has external lead ballast that makes up about the forward 1/3 of the keel. It is secured with bronze bolts through the bottom of the hull and the nuts over these bolts were then glassed over by the factory/yard. This makes me think the yard never intended for...

Sailed in very light air-never picked up more than the 2mph it was when we got to the site. Moved and tacked very well for such light air. Check out the thread here for video and more...

Sailed in very light air-never picked up more than the 2mph it was when we got to the site. Moved and tacked very well for such light air. Check out the thread here for video and more-scroll down...

5 meter skiff drawing showing the underside of the hull with one wing extended, using a pair of opposed hydrodynamic wings for roll control

Drawing showing the wings counter force to the winds heeling force to each side of the boat.

The wings installed on the boat.

Hull design. Section A is a flat, front to back planing surface. B is a flat incline to mount the bow wave easily. C is a sharp flat to push the bow up out of a wave. D is a standard bow section.

5 meter skiff using a pair of opposed hydrodynamic wings for roll control