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The new compmillennia 39 cat

Old 09-21-2015, 04:10 PM
  #381  
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Originally Posted by MakoMyDay View Post


By my estimation, to get 2@45 you'll have to be burning 22.5gph, or 11 gph per engine. 350 mercs do 11 @ 3900ish. So you have to do 45 at 3900. With a 6250 max, you'll need a boat that runs about 73 on twin 350s.

I'm gonna double down on your 100mph pilot house too. Another case of beer if you break 80mph, an entire keg of high life over 85.

And don't get me wrong---I hope like hell that you can do it, would be incredible. Hopefully beer's on me for a while..

We will be there 73mph.... JIM..the pressure's on!!!
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Old 09-29-2015, 10:43 AM
  #382  
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Default We are not a Cat, We are a Tunnel Boat!

We are not a Catamaran, We are a Tunnel Boat!

As a School boy I must have doodled drawings of tunnel boats a hundred times. One of my Hero's, Renato Molinari was one of the pioneers to develop the air entrapment tunnel boat design. I never got around to building one, (until now) but did buy one of Mercury Racings shovel nose Molinari's. 114 mph from a single Mercury racing 150 hp 1350 super BP engine is not shabby.

Looking at the deck plan of Ray's boat, the resemblance is fair to see, but it was more of a form follows function than copy Renato which drove the design. We wanted a clean deck that you could walk around without tripping or walking off the edge unintentionally, and the anchor roller feeding the reel anchor windlass in a useful location forward. All of the elements blended to achieve the bow design as built.

No secret implant in a young boys mind, or was it? Something about Molinari's boat name made twice the impression too!

# 68 "Miss Titti" Renato Molinari, Tavernola, Como, Italy; 21' Molinari, dual Mercury 1250 Stackers! Designed to beat OMC's Scotti, Sanders, and McConnell.
Renato's girlfriend, was called Miss Titti, for two good reasons!
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Last edited by Otseg; 09-29-2015 at 03:24 PM.
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Old 09-30-2015, 08:29 AM
  #383  
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Originally Posted by Otseg View Post

...


Renato's girlfriend, was called Miss Titti, for two good reasons!
You included two photos and a diagram, yet none of them included those "good reasons"? Sheesh.
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Old 10-09-2015, 02:05 PM
  #384  
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The stern of Ray's cat is a very busy place, and now that it is substantially complete will remove a hurdle to the finish work.

Years ago I worked for Gougeons building a 30' wood/epoxy racing sailboat for the Uznis Brothers in Detroit. "Hot Flash" was cold molded with cedar planking, and of course epoxy. The hull sides were not painted, but varnished. Every couple weeks either George or John would drive up to Bay City from Detroit to follow progress. It was pretty funny the day George saw the hull in final finish, with the varnish a mirror and wood grain leaping out. We all were pretty happy with the boat all along but when George walked through the door he started jumping up and down. He ran a lap around the boat and gave the stern a big hug and lifted the transom off the ground to the extent that the chocks fell over and he became the support holding the stern off the ground. We had a good laugh and let him sweat for a while before we helped him out.

With Ray's build we are pretty happy, no, I should say very, very happy with the build so far. We are not shiny nor have wood grain leaping out at this stage, but as we become shiny, I won't be so stingy with pictures. Ray, off to the gym to prepare for the lift until then.
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Last edited by Otseg; 10-09-2015 at 04:35 PM.
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Old 10-09-2015, 02:46 PM
  #385  
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Look pretty big unless all your workers are 4' tall.

Can't wait to see more!
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Old 10-09-2015, 05:39 PM
  #386  
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The lines on that babe are beautiful. Hope it performs as good as it looks
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Old 10-09-2015, 05:56 PM
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Otseg, I love hearing your story's and want to thank you for sharing your knowledge with us common folk. I hope to see the boat in person one day.
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Old 10-10-2015, 06:07 AM
  #388  
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Life is simpler when we build to a design supplied. As a custom builder we provide value added to form, function and construction from our experience as a matter of course. We learn too from others. Of equal importance is repair experience. It has always been an important part of what we do. Learning what not to do is of equal importance. There are more ways to do it wrong than right.

We started with a clean sheet of paper, initially a 28 but then Ray came along. The contract was for a 34 with an option for 6 more inches LOA for a bit more cockpit space. Whats that saying about give an inch?

11'-6" beam increased to 12'-0" Ray was ok with that as the boat will live on a lift and can run to the Keys faster than can be trailer-ed. Might have been wider but it will be over the road at times. LOA cannot be blamed all on Ray. While he wanted the "pit" of a certain volume and foot print, I was keen to have a desired angle of attack and profile to the tunnel and stretched the LOA to achieve it.
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Old 10-10-2015, 06:18 AM
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Love the bow butter slice entry

Keep pics on
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Old 10-10-2015, 06:28 AM
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It does look pretty and it seems to be built to knock down spray.
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Old 10-11-2015, 11:10 AM
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I think "CAD" or Computer Aided Design is a wonderful thing. Key word is Aided. Really not so long ago "MAD" was the practice. Models carved from wood were used in the design process. After carving the scale model which was pleasing to sight and touch, there was the step of "taking off the lines" by measuring the model at its various sections. The model was often made in sections which could be taken apart and drawn on paper. This gave the boat builder a set of lines which he could convert to full size, or known as laying down the lines or lofting. Long battens are used to "fair" the lines. It is a matter of feel. The old master loftsman at the Nevins Yard was loosing his sight but could fair a batten by feel. His nose looked like hamburger because he had to get so close to the mold loft floor to see the measurements he would hit his nose on the nails holding the battens.

Now many go straight to the CAD drawing for their design but Old School probably works best for Old Boat Builders. I qualify that to say we hand draw the boat first and then put it into digital format.

I saw my first fax machine and first computer at Hunter marine in the 80's. We were working on a 60' race boat for the boss. Hunter spent $37,000 for three ACAD seats, three DX 386 computers and a plotter. Warren's "Kiwi" Dick McBride, who was to run the race boat program had a green African parrot named Recife who decided to claw his way up my leg while I was drafting. I smacked him my pencil and he flew across the room landing on a key board, causing the plotter to plot. All the engineers were dumbfounded, they had the system 3 weeks and hadn't been able to plot yet. It was a great incentive to learn CAD, because Recife would snap every pencil or pen he could find from that time on.
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Old 10-11-2015, 11:17 AM
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Originally Posted by Otseg View Post
I think "CAD" or Computer Aided Design is a wonderful thing. Key word is Aided.

I saw my first fax machine and first computer at Hunter marine in the 80's. We were working on a 60' race boat for the boss. Hunter spent $37,000 for three ACAD seats, three DX 386 computers and a plotter. Warren's "Kiwi" Dick McBride, who was to run the race boat program had a green African parrot named Recife who decided to claw his way up my leg while I was drafting. I smacked him my pencil and he flew across the room landing on a key board, causing the plotter to plot. All the engineers were dumbfounded, they had the system 3 weeks and hadn't been able to plot yet. It was a great incentive to learn CAD, because Recife would snap every pencil or pen he could find from that time on.
Hence the development of the phrase... THE BIRD IS THE WORD....AND DRAWINGS
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Old 10-11-2015, 03:36 PM
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Love the lines! Maybe I missed it but what power is she getting?
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Old 10-11-2015, 03:38 PM
  #394  
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I'm guessing 350 Verados
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Old 10-11-2015, 04:38 PM
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Originally Posted by Sarasota Line X View Post
Love the lines! Maybe I missed it but what power is she getting?
Note Osteg's signature
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Old 10-12-2015, 02:33 AM
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After drawing the boat by hand we really did work a long time to get it in to a 3D CAD program. Initially I was most interested in pulling renderings for marketing purposes. Try as I might I couldn't get the CAD designer to produce what I wanted from my drawing so I back pedaled and laid 1/4" plywood down for a mold loft and laid down the lines. The lines are full height and breadth, but with long skinny hulls you can do a "compacted lofting" meaning taking the stations and compressing them 1/3 so that the lofting is shorter. Its easier on eyes strained by computer screens and I like my nose the way it is.
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Old 10-12-2015, 06:29 PM
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One last CAD story. In the '90's we fabricated custom composite decks fitted to custom aluminum hulls for Derecktor Shipyards, . Aluminum boat builder Bob Derecktor was my friend and landlord as we leased a building in his Dania Florida shipyard. We built an IMS 50 racing sailboat together with Derecktor's aluminum hull and keel and our glass/foam sandwich deck, honey comb sandwich interior, carbon fiber mast, boom and rudder.

Bob hand drew an outline of the 50' hull and prepared a preliminary lines plan. We built a 50" model and tow tested it in the Dania cutoff canal to previous hulls of known performance. Any of the guys (M-F) in the shop that wanted to build a model to tow was encouraged to do so. 10 models later the last and best hull I took the lines off and gave the offsets to a friend to fair in a computer design program for plasma cutting the aluminum frames. The lines were beautiful but Bob looked at me and said, " Do you think we should make one more model from these lines to be sure?" What he meant was "Make another model" We did and it was slower. The computer had curves it liked better than ours so that's what the program used. We had to trick it into matching the physical model. Bob looked at me and said, " Do you think we should make one more model from these lines to be sure?" What he meant was "Make another model" We did and it was faster. That was OK. Fast enough to win its first race from Newport to Bermuda. That was A-OK. It is my hope and expectation that we will be OK too.
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Old 10-13-2015, 11:50 AM
  #398  
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Started fitting the sparky bits. I was not keen to have 80 lbs right in the bow, but certainly can appreciate the luxury of a free wheeling reel anchor windlass. We are tucking it away 8 feet aft and you can check on the spooling from the comfort, convenience and safety of the cockpit.
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Old 10-13-2015, 01:46 PM
  #399  
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What anchor did you finally decide to go with?
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Old 10-13-2015, 04:07 PM
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that's not an ez anchor puller is it?
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