Rudder & Keel Templates

Keel & Ruder Templates - click here if you wish to add to this discussion RE: Keel & Ruder Templates


From: Mark Yancey, Manhattan Magic Date: Thu, 7 Feb 2002
Subject: Keel and Rudder

We are looking for the keel and rudder templates.

Also thinking of building an elliptical rudder as our is a straight blade and real heavy.

Any thoughts or tips contact us through the group or ManhattanMagic@cox.net


*see Keel & Rudder Templates


From: Peter d'Anjou, x-Gryphon Date: Thu, 7 Feb 2002
Subject: RE: Keel and Rudder

I have the class keel templates and I also have an optimized set of keel templates I had made by Geoff Van Gorkum. They fit within the chord dimensions of the class templates. If you sign up for the class association I'll send you tracings of the class keel templates. I also have the standard elliptical rudder templates taken off Invisible Cities. I morphed my original hull 31 rectangular rudder to the elliptical standard. The elliptical had a gradual increase of 4" in chord length at the top of the rudder over the rectangular. The added wetted surface keeps the wipeouts down and provides better lift because the section has been optimized. Again, any class member gets em for free.

I split the optimized templates with Norm and if you want to chip in then I guess that's one-design racing. The boat is close to target speed in PHRF racing with these optimized blades. It also points a whole lot better than it used to. That's my program on keel and rudder templates.


From: Randy Richter, Pressure Drop Date: Wed, 3 Apr 2002
Subject: RE: Keel and Rudder

What has happened with the making of the optimized keel templates? Is that effort underway? As I had stated before I would like to get a set


From: Trevor Baroni , Picante Date: Thu, 4 Apr 2002
Subject: RE: Keel and Rudder

This is no problem . . . I just haven't heard anything about the "optimized" table of offsets. I do have a modified set for the design of Picante's rudder, but i am sure that is a difference from what was discussed earlier . . . I think Peter had the "optimized" table of offsets . . . or the templates themselves. If I can get that, I will crank out templates right away.


From: Peter d'Anjou, x-Gryphon Date: Thu, 4 Apr 2002
Subject: RE: Keel and Rudder

I've sold the optimized templates along with the boat to Mark McCarthy but I have specifically requested that the class templates for both rudder and keel go to the class at large. I will hand over both sets to Mark this weekend and you can contact him if you need a set.


From: James Gallagher, Celeritas Date: Thu, 4 Apr 2002
Subject: RE: Keel and Rudder

"optimized" how?


From: Peter d'Anjou, x-Gryphon Date: Fri, 5 Apr 2002
Subject: RE: Keel and Rudder

When I bought hull 31, the keel's leading edge had been "faired" substantially. She was blazing fast downwind but had trouble pointing upwind. I consulted some experts and they said that the key to pointing was a fuller front edge. I got the "class templates" made by Mike LeSarge from Fiberplastics in Alabama who repaired a lot of storm damaged boats and through an early association with Soverel Marine had the original Peterson keel templates. I saw that my keel was "thinner" up front than the templates. I then took the templates to Geoff Van Gorkum a local Newport Yacht Designer [Van Gorkum Yacht Design] and asked him to analyze the foils with his computer foil program.

My instructions to him were not to exceed the cord length or max thickness of the original templates. He came back with a slightly fuller front section and max width moved back about 30 percent. The old templates still "fit" over the keel but where max width is is further back. I considered this within the box rule and within the definition of fairing, although I'm well aware of the definition of fairing I consider this as extreme a case. Did I do this to get better lift, more point and speed, You bet!


From: Sandy Sellers, Sled Hunter Date: Thu, 12 Sep 2002
Subject: RE: Keel and Rudder

I understand you have plans or templates for a soverel rudder. If so I was wondering if I could get a copy. If anyone else has information on making a rudder I would appreciate hearing from you.


From: Chris Merkle, Moisture Missile Date: Mon, 16 Sep 2002
Subject: RE: Keel and Rudder

Is it true that if I join the soverel class for $100.00 then I get access to the templates as well?


From: Mark McCarthy, Pressure Drop Date: Mon, 16 Sep 2002
Subject: RE: Keel and Rudder

Correct. We had hoped to provide some incentive for joining the class other than the ability to vote at the annual meeting or on any rule changes. Although we do share a lot of "free" information over our website, there is a cost associated with maintaining the site, mailings, promoting the class, etc. . . .


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