Original Dimensions for the Whitby 42 Rudder

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4 years 5 months ago #2282 by Bruce Hancock
Original Dimensions for the Whitby 42 Rudder was created by Bruce Hancock
I have been lucky enough to be babysitting a Whitby 42 that belongs to my brother for the last 5 years. One project that I would like to tackle this winter is to try and improve the steering on the boat. I have heard that several people have enlarged their rudder. I do not know if the rudder has been modified on the boat. Could someone please tell me how I can find this out (dimensions of the original rudder) and also I would be interested in people's opinion about enlarging the rudder. Thank you.

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4 years 5 months ago #2283 by Robert Strickland
Replied by Robert Strickland on topic Original Dimensions for the Whitby 42 Rudder
I'm not sure of the exact deminsions,but if you check the gallery page on this site there are copies of the original diagrams, and you can compare them to the shape of your rudder. It's usually pretty obvious if the rudder has been modified.
We did ours back in 1995, while in Trinidad. It was one of the first projects we tackled and has been one that really improved the boat for us. We added 3-4 inches of length to the trailing edge at the bottom and tapered it up to the original at the top and added to the bottom to make it parallel to the bottom of the keel.
It has really improved the steering, especially at slow speed and in tight quarters.
Dee, Allegria 199

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4 years 5 months ago - 4 years 5 months ago #2285 by Gerry O'Donoghue
Replied by Gerry O'Donoghue on topic Original Dimensions for the Whitby 42 Rudder
Send me an e-mail to whitby42 "at" gmail.com and I will send you a .pdf with rudder information. I think this .pdf is on the web site but I can't seem to locate it.

Gerry
Last edit: 4 years 5 months ago by Gerry O'Donoghue.
The following user(s) said Thank You: Scott Lee

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4 years 5 months ago - 4 years 5 months ago #2287 by Scott Lee
Replied by Scott Lee on topic Original Dimensions for the Whitby 42 Rudder
Gerry, is this the file?

Rudder build notes from Doug Stephenson

If not, email it to me so I can post it.

Scott
Last edit: 4 years 5 months ago by Scott Lee.

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4 years 5 months ago #2288 by Scott Lee
Replied by Scott Lee on topic Original Dimensions for the Whitby 42 Rudder
As always, a huge thank you to Gerry. Here is the file which, in addition to the measurements of the original rudders, includes a ton of information on rebuilding one as well.

Whitby 42 Rudder

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4 years 5 months ago #2289 by Bruce Hancock
Replied by Bruce Hancock on topic Original Dimensions for the Whitby 42 Rudder
Thank you everyone for responding my inquiry. I can't wait to look at the plans but I'm having difficulty opening the Whitby 42 Rudder link that was in the last post. A message appears that indicates that I am not authorized to open the file. Is there a trick that I am missing?

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4 years 5 months ago #2290 by Scott Lee
Replied by Scott Lee on topic Original Dimensions for the Whitby 42 Rudder
My bad... Try it now.

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4 years 5 months ago #2291 by Bruce Hancock
Replied by Bruce Hancock on topic Original Dimensions for the Whitby 42 Rudder
Perfect - thank you!
I will let you know how I make out.

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4 years 5 months ago #2294 by Edward Watson
Replied by Edward Watson on topic Original Dimensions for the Whitby 42 Rudder
Just a note on the Whitby rudder enlargement.
1. The internal structure was not always up to the extra stress that enlarging the rudder surface will create.
2. Enlarging the surface area may over-load some of the smaller autopilots found on older Whtibys.

Both of these happened to me with the New Hope.(306)
The larger rudder surface over powered the Pilot (Robertson), and I had to cut 2 inches off the trailing edge of the enlarged rudder.
Then the rudder structure failed four years later. I replaced the rudder with stainless plate, and after two more years trimmed another inch off the trailing edge. The rudder now makes the pilot happy and still is better than the old size.
The lesson is, Inches added to the bottom are better than just making the rudder longer.
And do not be surprised if the internal structure fails.
In Marathon, #306, New Hope
The following user(s) said Thank You: Gerry O'Donoghue

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