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20 Seagull Nautico catamaran project

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20 Seagull Nautico catamaran project

Old 11-10-2019, 06:29 PM
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Default 20 Seagull Nautico catamaran project

My dad and I just bought a 2000 20ft nautico cat. Figured I'd give back to the community as we get this thing back on the water. This site has given us so much information and I enjoy scrolling through projects for ideas and whatnot. Havent posted much of anything so bear with me. Open to ideas and suggestions as well. We are in New Symrna Beach so most of our outings will be offshore, trolling in the stream out of Ponce Inlet and Cape Canveral.

Supposedly floor was redone in '14, and has been sitting like this since. Gas tanks dated '06. T top seems to be un-used since installed. From looking at other nautico's a fish box has been added upfront as well as livewell and enclosed the splashwell vs a door. Boat needs power, wiring work, rubrail, and would like to do some type of non-skid. Thinking about the awlgrip with griptex for the deck. As for repower, thinking a pair of used 115 4 strokes. Suzuki dealer said 115s were lowest hp with counter rotating available. Not sure about other manufacturers. Maybe someone can chime in.

Ill do my best to keep post updated. Hopefully someone will find this thread usable. Also apparently need 10 posts to post pictures so will add those as soon as possible.
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Old 11-10-2019, 06:59 PM
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I would be concerned with weight on Twin 115/s and suggest you fill a couple of 55 gallon drums on the stern at the dock to see if your transom lip, scuppers and tunnel top does not get too low with a couple of guys in the rear wanting to drown the motors, keep floors wet and create a lot of tunnel sneeze. Most leader/nautico 19's that I have seen were set up with single 90-115, but I would go with twins, but twin 115's sounds like more than ample power, and a lot of weight. Max hp for the heavier seacat 21 is T90, as another example.

Counter roatating is not a big plus on a cat, so I would consider a pair of lighter T75-90's, Not sure if you have controls that will work with new twins, but I suggest you look at twin Merc 4 strokes to get a newer design that will save you about 150 lbs on your transom and some dough. I have had suzy 115's on a Seacat 22, and I thought they were heavy for that hull.

Gas tank capacity is another issue with larger motors as the T115's will require about 120 gallons, which again is a lot of weightfor the 20 foot cat imo.

And if others are putting LW and fish boxes near the bow, rear, engine weight may be why.
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Old 11-11-2019, 04:39 AM
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Thanks for the input. I orginally had pictures to go with the discription so i am sorry for the confusion but the livewell is behind console not up front like the fish box. Although now that I think about it with that thing filled up i could see how a couple guys back there with the weight of heavier 115s could create an issue. The last thing I'd want is to regret the whole repower. As of now there are no controls on the boat. So will be starting from scratch.
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Old 11-11-2019, 10:15 AM
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Originally Posted by ashorty View Post
Thanks for the input. I orginally had pictures to go with the discription so i am sorry for the confusion but the livewell is behind console not up front like the fish box. Although now that I think about it with that thing filled up i could see how a couple guys back there with the weight of heavier 115s could create an issue. The last thing I'd want is to regret the whole repower. As of now there are no controls on the boat. So will be starting from scratch.

Is it the 20, or the 19? with no pulpit?
3 batteries in the console for twins will probably be better than in the back. If you don't use live bait, I would replace it with a LP for a cooler and 4 rods to get more space in the rear.
I love suzies but I think the newer generation Merc 4 strokes are a better lighter engine. Try to keep the small cat as light as possible. Just 300 lbs can cost you 10% on fuel economy and speed.If its the 19 a pair of 75's will be enough as you are not going to cruise much over 25 in 2' chop in a small 19-20 cat, Strongly recommend Permatrims to extend your footprint.
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Old 11-11-2019, 11:03 AM
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From your description, I believe you have the Nautico 20, not the Seagull by Nautico 19. The Nautico 20 came with twin 70 four stroke Suzuki's in the 2000 era, a walk through transom and is a wood cored skiff style hull with no inner liner. The Seagull by Nautico 19 is a composite boat and came with an inner liner, with in floor storage and a single 115 or 130. If you have the Nautico 20, make sure you check the transom to make sure it is dry and solid...they were known to have wet transoms that needed replacement. You have to have a solid transom before you can start to look at hanging any motors on there. Once you determine the transom is solid, I would launch the boat if possible. Have 2-4 guys with you and some tubs that can be filled with water....fill the tubs and place them as close to the transom as you can. Have the 2-4 guys walk around the deck, front to rear, side to side, all on one side, etc.....that will give you an idea of how much weight you can hang off the back. Salt water weighs roughly 8.6 lbs per gallon, fresh water is roughly 8.4 lbs per gallon.....so you should be able to measure and get a pretty accurate accounting of the weight.

Living where you do and the capabilities of that boat, you won't need that much gas.....90 gallons will be more than you could ever go through in a weekend. More like 20-30 gallons will be a normal trip for you. I agree with the PermaTrims....well worth it for that hull.
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Old 11-11-2019, 11:40 AM
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Great hull i had 2 of the 19 version with a single. The one had a 540lb engine and i felt that it was to much weight and closed the tunnel up to much. Even with the heavy engine 4 people could stand in the back and no water would come in. It was the procate version and i wish i could own one again with a suzuki 175 or similar engine
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Old 11-11-2019, 02:43 PM
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This boat has no inner liner. From what I gathered it was made in Mexico and came with twins. It clearly has had twins on it before. The previous owner had floor and transom redone with an invoice for 8k worth of work (includes other things, painted hull, fishbox, enclose transom) so boat itself is solid. Never been around cats, so theres obviously some learning to be had for me. And after the input and some research it seems like 90s would be the way to go although convincing my dad not to go with 115s maybe the hard part.
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Old 11-11-2019, 03:19 PM
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I wouldn't be hung up on the hp as much as the weight. I haven't looked them up lately, but I would check the weight of the Etec 90 and 115's (Etec 90 is offered counter rotating) and the weight of the Suzuki, Yamaha and Mercury 90 and 115's......let the weight, not HP, be the deciding factor between which of those motors you go with. I will tell you that I had Etec 90's on my Seacat SL1 (21') and they made it jump right up on plane and cruised easily...they were all I needed. I don't know how the four stroke 90 or 115 compare to the Etec 90, but they were strong little motors.
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Old 11-11-2019, 09:04 PM
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Originally Posted by ashorty View Post
This boat has no inner liner. From what I gathered it was made in Mexico and came with twins. It clearly has had twins on it before. The previous owner had floor and transom redone with an invoice for 8k worth of work (includes other things, painted hull, fishbox, enclose transom) so boat itself is solid. Never been around cats, so theres obviously some learning to be had for me. And after the input and some research it seems like 90s would be the way to go although convincing my dad not to go with 115s maybe the hard part.
You can weigh it on a trailer before you order motors
My seacat22 which has a similar bottom was a 39 mph hull with twin 115's. The hull, no motors. weighed 3200 lbs with just the console, no ttop. gear or gas and 140's would have been ideal for a 30 mph cruise under 4500 rpms. But this was prior to the 150's getting lightened up.

I think that hulll was around 7000 with a full pigged out fishing load with 3 guys. But as I said, loading her with 60 instead of 120 gallons made her ride a lot better and faster, so weight in more of a factor on a small cat.

If they did all the restore work, lets hope they didn't increase the hull wt too much., But again your needed hp will depend on weight.
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