butt guru's please

barryfish

Senior Member
Hi,

I am looking at 2 butt cats one is a 23 the other a 21. the 23 is just longer 21. the one boat has 6 struts the other 3.

Understand made in different years, why and which is the better hull?

any ideas?
 

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barryfish

Senior Member
hull damage, worth restoring?

The hulls look different as well, one has chines other not?
 

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hamco

Senior Member
Sorry Barryfish, i have no knowlegde of butt's, there is somewhere a thread of a butt restored, I think lurker69 and I think Hammertime also worked on his.
 

barryfish

Senior Member
Hi Hamco.

Know there are 2 different molds, one concrete one grp. the concrete are older models, just not sure which is which, and the strut change from 6 - 3 must be part of the mold change. just which one is the "better one"

Shot
 

miles

Sealiner
Hiya

The hull WITH-OUT the chines is a VERY, VERY old boat!! Those were the ones that were still made in the river bed and then concrete moulds.

The newer version has the chines, as can be seen in the first photo (the red boat with a white hull). The bow is also quite a bit different from the older 20'er to the newer 21'er. Its higher and flares out more.

Get the newer one, the one with the chines
 

tkei

Sealiner
Barry,
I sawe that red one for sale. The motors old, but the rest lokms not too bad. The nr of struts could be froma ll sorts. I would also got her newer model and there is a lot less work to do to get her seaworthy. Sure you pay a bit more, but she still looks to be fairly solid.
 

barryfish

Senior Member
Hi Tkei,

These 2 boats are the same price, one just further to schlep and one without trailer (Blue). Would not take the motors on the red boat, too old, hull trailer only, there is some damage on hull in the front that looks like been repaired above pic, does not look 2 serious tho. My other option with 2 x 80 yammies, is tied up with red tape, waiting for the sale list to be propagated, it is the better option so may wait a bit, perhaps it will still come available

Thanks
Barry
 

Seeker1

Senior Member
My only experence with Butt cats was having one built for work some 15 odd years ago, anyway on that hull there was no timber support under the deck and the deck just rested on the foam in the hull. Those struts where only put in after the deck was glassed in, and as can be seen in the pic only ran from the deck to the gunnel, all they did was stiffen up the hull sides above the deck.

Are butt cats still built the same today?
 

Nonzo

New member
Hi Barry fish. I see the quest for a Butt Cat continues. As you know, I am new to the world of Butt Cats but as far as I know the more modern Butt cats (those with the larger tunnel when viewed from the stern) have wooden wooden 'beams' under the deck. These are obvioulsy glassed in and they carry the deck. Their effect is also to 'compartmentalise' the foam under the deck. I notice that the struts on the two boats you show are different - the newer, red boat's struts (a local boatbuilder calls them 'bulkheads')are more triangular in shape whereas the bulkheads on the older boat are more flush against the gunwhales. What I find interesting is that my older 21 footer has the triangular bulkheads but my mates newer 18 footer has the flush ones. On the other hand my boat has only 2 bulkheads while my mates boat has three. Does this mean that the triangular ones are stronger?
 

barryfish

Senior Member
Hi Nonzo,

I am very confused about the bulkheads? I have seen 18.6 with 3, 21 with 6, 21 with 3, and now your 21 has 2. Perhaps they placed as many as necessary per boat dependent on the thickness and rigidity of the hull, so one this boat we out 3 on another 3 etc? from what I have found is the Larger one is on the newer boats with the chines, does your mates have chines, maybe it is older? seems the hulls without chines have the 6 bulkheads.

Jep it continues...gave the invader a miss. trying to wear down the red tape, may be getting there. The ones found so far that that need restoring, all seem to have repair issues and price too high, considering all the cost or rebuilding/bad repairs etc.

Older ones that are good have been re done but, taking into account new price, and that most have very old motors not many good deals.

So we continue, no rush tho, have decided to keep looking slowly , the right one will come along.

Hows your build progressing?
 

Mavers

New member
Those are not bulkheads per se. Bulkheads are to a boat, what walls are to a house.

Continuous subdivision (normally watertight) from bottom to deck, and side to side or from bulkhead to bulkhead, to create an enclosed space.

Those would be better described as bulwark stanchions or bulwark frames. They should be aligned with either underdeck frames or underdeck bulkheads.
 

Nonzo

New member
Thanks for that Mavers. Your 'definition' of a bulkhead accords with what I had always understood. I started calling those 'struts' bulkheads when I heard the local boatbuilder use the term. I thought he should know!! But what you say makes perfect sense and I shall try to remember to call them bulwark frames in future!
 

Nonzo

New member
It is a bit confusing that such an important design/strength element as a bulwark frame should be used randomly. I don't know what the answer is. My mates boat does have chines - it's a much newer boat than mine.  I am going to try and attach 2 images to this showing the bulwark frames on my boat at the start of the rebuild.
 

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Mavers

New member
I agree their spacing should not be random.

If there is any structural design behind it, you should find that there are underdeck frames or transverse bulkheads in the bottom at the same locations as those bulwark frames.
 

Nonzo

New member
You are absolutely right. I had a chat to the boatbuiler today. And he confirms that the frames are in fact above-deck extensions of the transverse supports below the deck. And it seems that they were not random. According to my informant who has over 30 years experience with Butt Cats, the basic hull design was standard with bulwark frames coinciding with the the wooden under-deck structures (which were also standard). But what happenede in practise is that boats were customised and all manner of consoles and cabins were fitted. Some of these necessitated some bulwark frames being removed. In the case of my boat that was almost certainly the case. Then in due course the console (which necessitated two frames being removed) was itself removed giving us the mistaken impression that my boat was built with fewer frames than others. 

BTW Mavers, the boatbuilder mentioned today that they used to call bulwark frames 'knuckles' in the old days!! Interesting.    
 
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