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Old 06-02-2014, 09:33 AM   #41
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Thanks to Richard and Larry for the comparative commentary. It's that kind of information sharing that can help the rest of us learn from the process. I'm more encouraged about paravanes as a rational investment to reduce roll.
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Old 06-02-2014, 11:33 AM   #42
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Bill

Check with the Gulfstar owners group to see if a set of plans for paravanes exists. Frequently the marine architects will do that for a trawler they designed. Existing plans would save you a lot of hassle.
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Old 06-02-2014, 12:41 PM   #43
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Thank Marty,
I've been on Gulf Star owners forum site. Not a lot of activity there. And their asking the same questions. It seems as if nobody has added them to a gulfstar yet, or at least I haven't heard of one, Just the "offshore" trawlers seem to have gone to that expense.
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Old 06-02-2014, 08:35 PM   #44
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This is from Beebe's first edition (1975). It gives you an idea of the loading for paravanes. He's was convinced that the fish can generate resisting forces up to 10 lbs. per square inch. Our fish are ~300 square inches each. Proper design is critical.
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Old 06-06-2014, 09:15 AM   #45
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Hi Larry. Could you snap a couple photos of the attachment points of your poles and cable ends where they attach to your hull? The outrigger poles, are they attached to the hull with backing plates and is the location of the attachment point above the deck through your bulwarks or below deck through hull.
Thanks
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Old 06-06-2014, 10:04 AM   #46
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No problem. Let me find them.
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Old 06-06-2014, 10:13 AM   #47
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This would be nice to see Larry. Almost everyone I see with the Paravanes is on the 40' and over boats. Anyone aware of the smaller trawlers rigged with the Paravanes?
Thanks
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Old 06-06-2014, 11:12 AM   #48
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Originally Posted by stevensibs View Post
Hi Larry. Could you snap a couple photos of the attachment points of your poles and cable ends where they attach to your hull? The outrigger poles, are they attached to the hull with backing plates and is the location of the attachment point above the deck through your bulwarks or below deck through hull.
Thanks
No backing plates for the a-frame/pole mount but yes for the forward guy at the bow. The mounting bracket has an access plate, pic 7. The bracket is also vertically attached with SS lag screws to the rub rail. Sounds like you're thinking about it. Are you going to build some? Beebe's book has been spot on for ours.
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Old 06-06-2014, 12:00 PM   #49
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My Dad invented this during the 60’s and patented it early 1970's. He adapted the concepts from airflows on wing’s while flying Spitfires in WWII.

I spent a few of my mid to latter 1960’s young years building and sea testing it with him. Simple, inexpensive, thorough, no moving part other than flexible curtain; with correct materials it would last indefinitely. Can be affixed to various boat bottom portions and built to various dimensional needs. Works like a charm while moving and standing still. Perfect for displacement cruising trawlers, motor sailors and the like!

I plan to someday reinvigorate this product; after I’m finished with my other inventive ventures having nothing to do with boating... I have improvements in its design and understand all its working features.

Dad tried half heartedly to market this stabilizer but while getting old he never hit the mark. I feel correctly marketed it could become a marine stabilizer winner!

HYDROFOIL-SHAPED STABILIZING OR ATTITUDE-AFFECTING MEANS FOR BOATS

Abstract

A hydrofoil-shaped stabilizer or attitude-changing means for boats, having an elongated frame assembly adapted to be connected to a submerged portion of the hull of a boat with its longitudinal axis parallel to the fore-to-aft axis of the boat. A flexible curtain assembly extends about the frame assembly and is fixed thereto but free to move laterally and to a more limited extent longitudinally relative to the frame assembly. The interior of the curtain assembly communicates with the surrounding water and is deflected to one side or the other relative to the frame assembly by its displacement relative to the water caused by a change in the attitude of the boat so as to form a hydrofoil having a camber for generating forces to oppose the change in attitude to one side or the other when the boat is underway.
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Old 06-06-2014, 02:18 PM   #50
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Sure would like to see some sketches.
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Old 06-06-2014, 02:21 PM   #51
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No backing plates for the a-frame/pole mount but yes for the forward guy at the bow. The mounting bracket has an access plate, pic 7. The bracket is also vertically attached with SS lag screws to the rub rail. Sounds like you're thinking about it. Are you going to build some? Beebe's book has been spot on for ours.
Really a good looking rig Larry. Did you have this installed or design and do it yourself?
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Old 06-06-2014, 02:49 PM   #52
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This would be nice to see Larry. Almost everyone I see with the Paravanes is on the 40' and over boats. Anyone aware of the smaller trawlers rigged with the Paravanes?
Thanks
Reading this thread reminded me of a couple of pieces of trivia I saved in my 'Ideas' folder.

One is a photo of a later model Willard 30/4 that as near as I can determine, is the one prepared by Zimmerman for a trip to Bermuda.

The next is a drawing by Rick Etsell, NA who figures prominently in the Willard community. It is for a 32' Trawler, which looks similar to a Willard 30, but since there were no 32' Willards that I am aware of, it could have been a Fales 32, or some other design.

The point is, these are "smaller trawlers rigged with the Paravanes" as requested by kawilt.
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Old 06-06-2014, 03:16 PM   #53
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Really a good looking rig Larry. Did you have this installed or design and do it yourself?
Thanks. Bill Dawes who was a commercial fisherman came up with the original design and Tom Davenport, who owned a KK42, tweaked it to try to make it look cleaner and work better. They were on Hobo when we bought her. We did recently pull all the metal and repainted everything.
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Old 06-06-2014, 04:06 PM   #54
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A million thanks Larry for all this great information and that photo and rigging layout. What a help this is.
Bill
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Old 06-06-2014, 04:37 PM   #55
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Thanks so much Larry. And to everyone who answered. Yes I am going to build a set this year. The tanks are going in and then the engine and I want to build the outriggers while the engine room is still wide open.
My friends all say wait till she's in the water see how she rides. One doesn't need to be a naval architect to see how she's going to roll with those big fat round bilges. I'm pretty confident I'm going to need para vanes
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Old 06-06-2014, 06:20 PM   #56
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This would be nice to see Larry. Almost everyone I see with the Paravanes is on the 40' and over boats. Anyone aware of the smaller trawlers rigged with the Paravanes?
Thanks
I've got some pictures of paravanes on a 21' Ranger Tug on my home computer. Took the pictures a few years ago in Tofino, BC. When I get home I'll post them.
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Old 06-06-2014, 07:34 PM   #57
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Thanks Larry. Those photos are a great help. Very clean installation.
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Old 06-07-2014, 02:33 PM   #58
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Here's a 1987 Sea Sport that was for sale.

AK and the PNW have more than its fair share of boats, less than 40', with paravanes.
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Old 06-07-2014, 05:49 PM   #59
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Sure would like to see some sketches.
The patent on file has figures: http://www.google.ca/patents/US3753415
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Old 06-07-2014, 06:23 PM   #60
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In comparison to the patent:

Dad and I made improvements on streamlining the stabilizer unit and making it more efficient as well as increasing location/attachment availabilities onto different hull models of different style boats; deep keel sail boats included. Its automatic stabilizing capabilities are remarkable while cruising at displacement speeds or just above or below. Also, depending on placement position(s) it reduces roll while at rest. You can see the resemblance to Dad's Spitfire WWII wing’s cross section. Along with him I worked to complete, improve, and test this stabilizer's design; before and after pantent was issued.

How well I recall... Loved IT ALL!

Happy Stabilized Boating Daze! - Art
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