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  #191  
Old 05-03-2013
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Re: Bob Perry's take on Wolfenzee's dream boat

Things have been moving slower than they had been. Work at the office has picked up a touch so my days have gotten longer. It is sailing season so I have begin racing wednesday nights, doing annual maintenance on other the evenings, and getting out overnight on the boat on the weekends.

Behind the scenes a lot has been happening. As explained in one of my last posts on the subject, the design has begun to evolve towards a more mainsteam design. The idea would be to create a small, conservative, distance cruiser which also has better performance than some of the earlier generation of small cruisers. I have been thinking of this loosely as "What would a more modern replacement for something like the venerable Pacific Seacraft 34 look like?"

In that vein, the freeboard and cabin height has been raised to give the boat full 6'-2" headroom. The bilges have been slightly hardened for better initial stability and better dampening. The boom height was raised to allow for a dodger and the cabin trunk extended to allow for a full sized forward hatch. Ports were added for better ventilation as well.

I began running some calculations to see what the 'numbers' looked like, and arithmetic mistakes (which Bob was kind enough to gently point out) not withstanding, they do not look too bad to my eye. The sail plan was then tweaked to move towards a reasonable SA/D with the 100% foretriangle.

I must do a couple small mea culpa's on these drawings. The first sketch of this design revision came out 'wall sided' meaning that the topsides were too flat. Bob had quickly pointed that out and we talked about how we might improve that. One idea was adding some tumble home.

As I thought about that idea, I decided to take 'a flier' and tried out an elliptical transom, a form which is visually attractive, but comes with a bunch of negatives in my mind. Those include requiring a two part mold, more handwork, and exposing the topsides to damage. I put this quick sketch version together and sent it to Bob for comment. I apologize that it is badly drafted and so there are a bunch of humps and bumps where I did not go back in and clean up the fairing.

So here are the drawings reflecting these changes. I am now working a version without the tumblehome but also without the ellipitical transom.

[IMG] photo ProgressPrintingPS-32R-45-1-13_Page_1_zps94e56a6e.jpg[/IMG]

 photo ProgressPrintingPS-32R-45-1-13_Page_2_Page_2_zpse61b6d13.jpg

This is a little hard to see, but it shows the original Atkin's sail plan overlayed on the new sail plan.



I have really been enjoying this process. It has been quite a few years since I have drafted a boat of this size and so it has reminded me how much I enjoy this work. I also want to say how much I appreciate Bob taking the time to do this. And while I occasionally pounce on Bruce Farr and his crew when I see them around Annapolis, it is rare that a yacht design groupie like myself gets to have this kind of contact with someone of Bob's caliber and patience.

Onward and upward,
Jeff
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Last edited by Jeff_H; 05-03-2013 at 10:18 AM.
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  #192  
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Re: Bob Perry's take on Wolfenzee's dream boat

I like it

Maybe I would have preferred some very minor alterations, mainly aesthetically like the dodger not so much pulled aft or the beginning of the cabin (forward) not so vertical but that is much of a question of personal taste.

Regarding hull and keel design, I would have preferred a keel not so long with a smaller wet area with a bulb on the bottom to compensate the lesser lead length, not a torpedo, but that kind of torpedo shaped that starts at the beginning of the foil, for not get tangled in nets.

But as it is, it is a nice design and I bet, a better sailboat than the original one

Regards

Paulo
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Old 05-03-2013
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Re: Bob Perry's take on Wolfenzee's dream boat

That's sweet, Jeff! I was amazed to see the difference in the sail plans. That should be a heck of a ride! So, Wolf, when are you going to have her built?
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  #194  
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Re: Bob Perry's take on Wolfenzee's dream boat

Paulo,

When it comes to our personal preferences you and I are roughly in the same place. One of my objectives for this exercise is to show a bit about how a design can evolve as we look at the potential owners for the boat. We started with a design which would have been an anachronism if built today, and modified it purposefully bearing mind that the owner of the precident design loves his boat so the changes were intentionally only modest improvements.

This current evolution is still intentionally conservative. It should retain many of the virtues of the older design, while responding to a more modern audience.

Ultimately, I would like to finish this design to a relatively complete level of design, perhaps adding an interior plan once Bob and I wrap up the lines drawings. Then I would like to take the same general displacement and ballast ratio, and design the boat that I would build if I were doing this for myself. (Roughly 38 feet, and a few feet wider)

You and I have talked about the fact that a boat which is long for its displacement can still have all the amenities and virtues of a smaller boat for its weight. I think if successful, this design evolution should help illustrate that point.

Jeff
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Re: Bob Perry's take on Wolfenzee's dream boat

This is always tricky, Jeff, but that dodger isn't doing the otherwise beautiful lines any justice...
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Re: Bob Perry's take on Wolfenzee's dream boat

Jeff/Bob, that boat justs gets sweeter and sweeter! I think you'll have a bunch of us lining up to buy the plans when it's ready, myself included! I have a 35ft boat at present, but I've always thought something around 30ft would be my ultimate cruiser (when the kids grow up and leave the nest). That Wolf boat looks just about perfect so far. Thanks for sharing the design process with us. It is a learning experience.
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Re: Bob Perry's take on Wolfenzee's dream boat

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Originally Posted by Jeff_H View Post
Paulo,

...
Ultimately, I would like to finish this design to a relatively complete level of design, perhaps adding an interior plan once Bob and I wrap up the lines drawings. Then I would like to take the same general displacement and ballast ratio, and design the boat that I would build if I were doing this for myself. (Roughly 38 feet, and a few feet wider)

You and I have talked about the fact that a boat which is long for its displacement can still have all the amenities and virtues of a smaller boat for its weight. I think if successful, this design evolution should help illustrate that point.

Jeff
Yes, I agree.

You mean a 38ft according with that design criteria, traditional look and all?

Regards

Paulo
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Re: Bob Perry's take on Wolfenzee's dream boat

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Yes, I agree.

You mean a 38ft according with that design criteria, traditional look and all?

Regards

Paulo
No, Paulo, assuming Bob is on board for this, she would not look traditional and all. This one's mine!

I'll gladly take input from you as she develops.

Jeff
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Re: Bob Perry's take on Wolfenzee's dream boat

I agree that the dodger needs some massaging and I'll forward Jeff some examples of what I like to see in a dodger.

I would like to see the traditional styling retained because I think that's what Wolf would like.

The rig may be too tall. I need to look at the numbers. With this displ I think a SA/D arounf 19.5 would be sufficient. We don't want to scare the Wolf.

Jeff had put a lot of effort into this. There have been several hull shape iterations that were never posted while we tried some diffeent things with the shape. Credit for Jeff for sticking with this and putting up with me as I critique his work.
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Re: Bob Perry's take on Wolfenzee's dream boat

That boat is looking like something I'd like to own. Simply putting side panels on the dodger would help the appearance a lot I think - provide better shelter as well.

I thought that retaining the overall appearance or "look" while improving the performance to more modern standards is what this exercise was all about.
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