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Old 12-22-2016, 08:21 PM   #1
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Batwings (stabilizers)

Searching around in old posts I found this reference from Tad about 'batwings' used on commercial fishing boats on the BC coast.

Trawler Forum - View Single Post - Roll attenuation

Anybody have experience with them?
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Old 12-22-2016, 08:48 PM   #2
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Bit of a quote from one boaters write-up on having them installed:

Quote:
...Some favored chine keels and other additions, but the most popular one in this part of the world seemed to be the 'batwing stabilizer'. I was especially convinced by the enthusiasm shown by the owner of a fishboat who regularly goes out beyond the Queen Charlotte Islands, and who said that once the batwings were
installed, the crew stopped bothering with the flopperstoppers...
Full quote here:

T&T: Stabilizers for Trawlers
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Old 12-22-2016, 11:03 PM   #3
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No experience, but they do sound promising. Nothing to do once they are installed other than antifouling.

I seems they would be easier to install on a hard chined hull, in comparison to a round bilge hull, but still much simpler (easier & cheaper) than any other stabilizer system.
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Old 12-22-2016, 11:55 PM   #4
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Old 12-23-2016, 12:09 AM   #5
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A few different types here.

Stabilisers - Rogers and Lough Marine Engineering
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Old 12-23-2016, 01:20 AM   #6
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Rebel installed some rolling checks on Rogue last spring/summer. Maybe he can give us an update on how they seemed to work out?
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Old 12-23-2016, 01:28 AM   #7
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Quote:
Originally Posted by dhays View Post
Rebel installed some rolling checks on Rogue last spring/summer. Maybe he can give us an update on how they seemed to work out?
Batwings appear to be significantly different than rolling chocks...see Tad Roberts drawing at link in first post.
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Old 12-23-2016, 01:47 AM   #8
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Starboard Batwing

Source: http://www.boatdesign.net/forums/att...rovider_12.jpg


http://www.boatdesign.net/forums/att...llenger_05.jpg
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Old 12-23-2016, 01:58 AM   #9
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Good photo's at this link: Around the Boatyards 2014
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Old 12-23-2016, 09:42 AM   #10
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From the photo's found so far, it seems any Joe Blow can cobble together a set of batwings with whatever extra materials may be lying around and little effort or thought towards design. This set looks well thought out and nobody would know they were there unless on the dry: Moody Blue
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Old 12-23-2016, 09:46 AM   #11
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Tad Roberts addressed this exact subject here at TF a few years ago. I cannot locate the thread right now to provide the hyperlink.
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Old 12-23-2016, 09:54 AM   #12
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Quote:
Originally Posted by CPseudonym View Post
Tad Roberts addressed this exact subject here at TF a few years ago. I cannot locate the thread right now to provide the hyperlink.
Link to one such post is in post #1 of this thread...
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Old 12-23-2016, 10:37 AM   #13
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If doing ICW/east coast shallow water cruising it sure looks like those would be easy to tear off when running aground?
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Old 12-23-2016, 11:17 AM   #14
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Quote:
Originally Posted by MurrayM View Post
Link to one such post is in post #1 of this thread...


My bad Murray, missed it on my iPhone. Failing eyes and fat fingers can be a bad combination sometimes
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Old 12-23-2016, 11:31 AM   #15
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I'm really keen to have these fitted on Content. We are planning to head south next year or the year after, and ultimately ship her to Europe. This would greatly improve comfort on board, and extend her range, 'cos she rolls quite a bit. Tad Roberts suggested batwings to me, and I really like the fact that they're 'always there', both underway and at anchor.

However, someone mentioned to me recently that he thought they would potentially cause issues when exposed to strong currents, and could reduce stability, presumably only in extreme situations.

I would also be interested to hear of any first-hand experiences. That said, I'll be booking my boat in for the work early in the New Year.
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Old 12-23-2016, 11:49 AM   #16
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Quote:
Originally Posted by MurrayM View Post
From the photo's found so far, it seems any Joe Blow can cobble together a set of batwings with whatever extra materials may be lying around and little effort or thought towards design. This set looks well thought out and nobody would know they were there unless on the dry: Moody Blue
Murray, I guess the best solutions always look simple..... I'd certainly want some experienced input, however, before welding a bunch of pig-iron to my hull!
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Old 12-23-2016, 01:34 PM   #17
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Here's a couple of cleaner bat wing installations. These are big and heavy, 5/8" or 3/4" steel plate so well over 1000 pounds of additional ballast down low. They are not going to reduce stability.

These show the shortest possible support leg, which minimises drag compared with the type (On Poplar III) where the leg carries up above waterline.

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Old 12-23-2016, 03:16 PM   #18
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It seems batwings are mainly popular in Canada. The closest I've seen to batwings in Australia is the winged keel on Australia 2 back in 1983.

They appear to be a great idea. An extra plus would be the ability to dry out at low tide on a suitable beach.
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Old 12-23-2016, 03:45 PM   #19
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Quote:
Originally Posted by Tad Roberts View Post
Here's a couple of cleaner bat wing installations. These are big and heavy, 5/8" or 3/4" steel plate so well over 1000 pounds of additional ballast down low. They are not going to reduce stability.

These show the shortest possible support leg, which minimises drag compared with the type (On Poplar III) where the leg carries up above waterline.

Attachment 59821

Attachment 59822
A good friend and frequent cruising companion has batwings on his FD 61' wooden boat. They have been trouble free for as long as I have know him. They were installed by a PO, long before he got his boat in the 80s. I don't believe he carries near the amount of zinc as show in Tad's photos.

Why all the Zincs?
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Old 12-23-2016, 04:02 PM   #20
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These taken in Blaine. Lots of zincs. . Troller that also fished offsore for Albacore.
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