Boat Plans Nz | What about keel shapes and keel bulb design

Boat Plans Nz

The Star 45 R/C Model Sail Boat - Builders Journal

"Dave Mainwaring"
Someone asked about shapes and sizes.

I like keels that resemble in some manner the "Scheel Keel". Flat bottoms help fight heeling. My version was based on my sailing in waters with lilies and pond grass that snagged torpedo shaped bulbs. I liked being able to back away and have the crap slide off the keel.

http://photos1.blogger.com/blogger/5587/620/400/Sirius%2045%2006.jpg

http://photos1.blogger.com/blogger/5587/620/400/Sirius%2045%2002.jpg


Here is a photo of the original Mainwaring Keel and Mainwaring Bulb

http://photos1.blogger.com/x/blogger/5587/620/400/353321/Sirius45Keel.jpg

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Boat Plans Aluminium | Star 45 Mainwaring keel and bulb on an old S45

Boat Plans Aluminium

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Boat Plans Bruce Roberts | Sailing model boat making your own keel bulb

Boat Plans Bruce Roberts

From: "Jim Adams"

I made a plug from balsa and finished it to a smooth finish.
Using two aluminum pans (the kind that you throw away). Fill the first one with plaster took the balsa-bulb (well waxed) and placed it in the plaster half way in. I used two pins through the center to hold it down.

Let the plaster harden, then pull out the balsa-plug. Next put thin saran wrap over the mold and place the balsa-plug back in the mold. Now comes the fun part I used rubber bands to hold the plug in place (remember I had two pins that extend past the mold walls). Fill the second pan with plaster and lay the first on top, it is kind of messy but it works. When the second half hardens (about two hours) pull them apart. You will need to plug the holes at the ends on the sides and create small air path upward in the and a spur (looks like a funnel when you are done this needs to be big enough to pour in the lead) at the end.

==
Pouring molten lead is dangerous. The plaster mold which Jim Describes must be absoultely dry and free of moisture or the lead can spray out ot the spur.

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Boat Plans Bolger | Weighing a keel bulb while attached to a boat

Boat Plans Bolger

The Star 45 R/C Model Sail Boat - Builders Journal: Weighing a keel while attached to a boat

Weighing a keel while attached to a boat
From "Larry Ludwig"

"Weighing a keel while attached to a boat can be done with a high degree of accuracy. You can test this out on a boat with a removeable keel. Lay the boat on its side with the keelbulb on the scale with the keel parallel to the table. Then take the keel off and weight it and you will be amazed that they are nearly the same, as in within 95% or better."

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