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1998/1999 Seagull 18’ Catamaran - Questions...

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1998/1999 Seagull 18’ Catamaran - Questions...

Old 11-28-2019, 04:42 AM
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Default 1998/1999 Seagull 18’ Catamaran - Questions...

Happy Thanksgiving, All. I am considering buying a 1998, maybe a 1999, 18’ Seagull catamaran. I have read threads here and they have been great. Especially about the word deck warnings. This particular boat has had the deck and wood stringers removed and replaced - no more wood - in the last three years. Deck seems solid, but what do I know. The boat is in rough shape with an older Suzuki DT 115. But because the rot issue has been taken care of, I am considering buying it and having a winter project to keep me busy. I cannot find much on the Seagull 18’ on the internet. I would love to have the specs, manual, etc. Does anyone know where I can get one? Also, I have the serial number but it does not “conform” to the standard format. Can someone point me in the right direction to decode a Seagull serial number? Lastly, I am considering, if I buy it, to re-power it with a used Evinrude E-TEC 115. 20” shaft. Any thoughts? Thanks in advance.
Old 11-28-2019, 08:51 AM
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After 10 posts you can post pics....
so contribute to other threads so we can see what your talking about.
​​​​​​welcome aboard!

Old 11-28-2019, 12:05 PM
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i have had 5 of the Seagull nautico 18's and love them with the only drawback being the deck issue. I would not go with anything bigger than a 90 on it and don't get sucked in to the myth that you have to run a four blade prop.with the correct 3 blade and 90hp you should cruise around 28 mph and wot around 34. Any faster and the boat will get squirrely. Good luck with an awesome boat that can hang with much bigger boats in kost conditions.
Old 11-29-2019, 03:45 AM
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Originally Posted by go2abaco View Post
i have had 5 of the Seagull nautico 18's and love them with the only drawback being the deck issue. I would not go with anything bigger than a 90 on it and don't get sucked in to the myth that you have to run a four blade prop.with the correct 3 blade and 90hp you should cruise around 28 mph and wot around 34. Any faster and the boat will get squirrely. Good luck with an awesome boat that can hang with much bigger boats in kost conditions.
Go2abaco:


Do you have any manuals?

And do you have an opinion on the Evinrude E-TEC 115 with a 20” shaft for the 18’ Seagull?
Old 11-29-2019, 04:16 AM
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And can you give me examples of other powered cats, other than Twin Vee’s? What does 18’ Seagulls compare to?
Old 11-29-2019, 05:34 AM
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No manuals no5 that you really need them. Also i think he 115 is a mistake and will be too much weight with and no good performance gain. As to comparing it with other cats of that size it is in a class of its own.
Old 11-29-2019, 05:55 AM
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We had an 18' Leader, which I think is a little fancier version of the Nautico, with a 90 Yamaha and I agree that anything more could be problematic as to the handling.
Old 11-29-2019, 07:24 AM
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90 it will be. 2 questions that I am still wondering about: 1. Is a 20” shaft the way to go? Keeping in mind that where I plan to use her will be in the shallow Indian River Lagoon in FL. Average depth of the 100+ miles being around 3 feet - and that is the average. 2. What would be the correct pitch, etc., for the prop? Thanks for the responses. I really need the advice and help.
Old 11-29-2019, 11:34 AM
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Originally Posted by zzotto21 View Post
90 it will be. 2 questions that I am still wondering about: 1. Is a 20” shaft the way to go? Keeping in mind that where I plan to use her will be in the shallow Indian River Lagoon in FL. Average depth of the 100+ miles being around 3 feet - and that is the average. 2. What would be the correct pitch, etc., for the prop? Thanks for the responses. I really need the advice and help.
1. You or a current Seagull 18 owner are the only ones who can answer your engine shaft length question, as the depth of water you will be using the boat in has little to do with shaft length. If it has an "older Suzuki DT 115" on it now, then that's the shaft length that should have on your replacement engine. You can determine the shaft length your self - with the engine in the down position, shaft length is measured from the underneath of the engines mounting bracket to the cavitation plate.

2. You will likely have to play with props to determine pitch. Ask the dealer you buy the engine from if he has any used props you can try, then you can get an idea of what you need. Most dealers are helpful with doing this as they want to also sell you a prop.

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