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Old Jan 27, 2010, 08:07 AM
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peconic steam's Avatar
Long Island, NY
Joined Dec 2007
507 Posts
Idea
Midwest fantail launch + Kitchen rudder

-Not too sure where to post this, anyway- Thought I would try to build a Kitchen rudder, and since this fantail kit has been collecting dust for too long... I don't have much of an idea where this is going other than to see how a system like this might handle.
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Old Jan 27, 2010, 10:38 AM
Grumpa Tom
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United States, CA, Los Angeles
Joined Sep 2003
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Wow, you are quite an ingenious person. That looks great.
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Old Jan 27, 2010, 11:46 AM
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peconic steam's Avatar
Long Island, NY
Joined Dec 2007
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! I think it's more like a lot of time on my hands this time of the year...
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Old Jan 27, 2010, 12:51 PM
Semi-Official Tinkerer
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Rochester NY
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I like it!!
Will you have a bottom pivot point? Dave.
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Old Jan 27, 2010, 02:22 PM
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Long Island, NY
Joined Dec 2007
507 Posts
Yes, the bottom points are secured to an extension at the keel
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Old Jan 27, 2010, 03:09 PM
jda
Fossil builder
Tennessee
Joined Apr 2006
436 Posts
The L shaped pieces and the round head screw, are they the bottom pieces for the keel attachment? I think the Kitchen rudder may be the answer to all single cylinder steam engines.... Am hopeful this works out well for you. Once tried rolling some brass sheets to make one of these rudders. No luck. I like your idea!
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Old Jan 27, 2010, 08:08 PM
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Toronto, Canada
Joined Nov 2004
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For those who aren't too sure on how they work. I will try to take some shots of mine tomorrow.
Regards,
Gerald.
PS Should we have this thread in the Steam section?
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Last edited by steamboatmodel; Jan 27, 2010 at 08:11 PM. Reason: PS
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Old Jan 27, 2010, 08:10 PM
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peconic steam's Avatar
Long Island, NY
Joined Dec 2007
507 Posts
jd, I tried the roll method too and went the rigid tubing route as the end result was a much sturdier pair of rudder halves. I'm thinking electric power on this one as I want to see how some moderate prop wash affects the system.
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Old Jan 27, 2010, 10:49 PM
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United States, ID, Rexburg
Joined Sep 2008
6,433 Posts
Had never heard of a kitchen rudder before, interesting idea for controlling a boat without throttle control (i.e. steam). Did a quick search and found this article in Wikipedia (or course) http://en.wikipedia.org/wiki/Kitchen_rudder
Now for a question or two; one channel for the swing of the rudder itself? second channel to run the clam shells? and how do you know what position the shells are in? lastly, how do you activate the clam shells, the pics do not really show the top (inside the transom of the boat) of the rudder and it mechanism?
Foo
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Old Jan 28, 2010, 06:12 AM
Veni, Vidi, Feci
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Motor City
Joined Dec 2004
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Here's a good explanation of the linkage:
http://www.boatdesign.net/gallery/sh...what/allfields

Search this site, you get about 3 pages of hits on Kitchen Rudder, including this image I took at Cabin Fever of a rolled set:

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Old Jan 28, 2010, 07:11 AM
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Long Island, NY
Joined Dec 2007
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Foo, you've got it right concerning the servo action. The push / pull, or clam shells opening and closing are controlled by a servo which in turn will swing as a tiller so we have left and right rudder when the 2 halves are in the open or ahead position. Like a normal rudder, you won't actually see what it's doing, but see how it affects the maneuvering.
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Old Jan 28, 2010, 01:21 PM
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Toronto, Canada
Joined Nov 2004
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Here are some shots of the top end that I found on the Internet.
The last four are the one I am working slowly on.
Regards,
Gerald.
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Old Jan 28, 2010, 03:20 PM
jda
Fossil builder
Tennessee
Joined Apr 2006
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Peconic Steam, My thought when I tried this, was that the prop shaft/prop should be at a right angle to the clam shell. More like a Kort nozzle. Is this just a matter of effeciency?
jda
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Old Jan 28, 2010, 05:47 PM
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Long Island, NY
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jda, Actually I can't tell you as I know very little about these rudders in real applications. I just saw one in a magazine and became interested enough to make one. So far everything looks like it should work on the one I'm building; will know for sure in about a week. pics. to follow-
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Old Jan 28, 2010, 05:54 PM
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Toronto, Canada
Joined Nov 2004
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Ideally the prop shaft/prop should be at a right angle to the clam shell. More like a Kort nozzle, but with the Midwest Fantail Launch you are stuck with the original angle unless you want to do a lot of redesign. With mine the basic Hull was already assembled and I had to finish the fiberglass (actually strip off what was there and redo it). The angle on the Elliott Bay is better. It should also be inside the clams when they are fully open with the prop filling the opening like a Korts nozzle.
Regards,
Gerald.
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