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Old 06-04-2010, 08:49 AM
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Default Twin vs Triple Outboards

(I tried to search, but haven't come up with anything yet....)

I've been looking at CC boats in the mid-30' range, and it seems to be a toss-up as to what may be on the boat. Some have 3x225s, while others of the same exact model may have 2x300s or 2x350s. I'm also considering older boats that I may want to repower.

As far as I can figure, 3x225 is more HP than 2x300, so in theory they're faster, but there's probably a bit more weight as a tradeoff (the Verados and Yams all claim to have the same weight across their HP ranges), which may negate the extra HP.

Given the same engine tech (i.e., Merc. Verado or Yamaha's 6cyl series) on identical hulls, what can one generally expect from having either 3 smaller HP engines vs 2 larger with total HP within 25-50 or so, as far as speed / efficiency / etc???

Also, how are trips rigged as far as prop rotation, and how does that affect the boat?

Thanks in advance for any insights!
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Old 06-04-2010, 03:05 PM
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Old 06-04-2010, 03:38 PM
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Count on this.... 3 motors cost a hell of alot more to maintain and repair than 2. Stick with a twin set-up. Really, 60 mph feels fast just like 68 mp does.

So, go with twins instead of trips... and spend your extra money on a cool radar, cocaine and hookers.
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Old 06-04-2010, 04:49 PM
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Is there anywhere I can find out the max HP rating of a particular model boat (from the capacity plate)? Does the CG keep these on file somewhere? I'm looking at a page out of PowerBoat Guide, and it says "Max HP: 600", but then goes on to say the boat delivers a top speed of 50-55kts with triple 250hp Mercury outboards. Is that a legal boat?
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Old 06-04-2010, 05:13 PM
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Here are a couple of things for you to consider..my $0.02
Assuming you are buying used and have the choice, my opinion is to go with the trips.

1) At the same cruise speed, you fuel consumption is likely going to be same and maybe even slightly better because you can use less RPMs for the same speed and the engines wont work as hard or burn as much fuel.

2) The third engine is nice to have should anything happen to one of the other two. I dont care what anyone tells you, there is no 34+ foot boat that will plane on one engine under normal circumstances. With two, you still get up and come home at a decent clip rather than spending the rest of the day coming in at 9-11mph.
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Old 06-04-2010, 05:18 PM
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Quote:
Originally Posted by Ft Myers Ken View Post
Count on this.... 3 motors cost a hell of alot more to maintain and repair than 2. Stick with a twin set-up. Really, 60 mph feels fast just like 68 mp does.

So, go with twins instead of trips... and spend your extra money on a cool radar, cocaine and hookers.

Except when you're 100nm from shore, something quits and you have to limp home at 8 knots instead of 25.. .

Last edited by surly; 06-04-2010 at 05:34 PM.
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Old 06-04-2010, 06:19 PM
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Ditto...we lost a 225 opti on my buddies fountain not long ago and hopped on plane on the other 2 and cruised home at 43 mph from 60 miles out. Going 8 knts gets you home, but it's not fun and takes a long time. This is a definite plus of the trips. The engines don't get worked as hard either.
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Old 06-04-2010, 06:22 PM
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Actually, that brings up something else...

From what I can figure from reading the rigging info on the websites, Yamaha's electronic controls would tie the middle engine into the port lever in a triple configuration. Mercury's DTS system, though, automatically controls the center engine when running triples based on the position of the 2 levers. With the Yamaha controls, you wouldn't be able to independantly control the middle motor if you lost the starboard engine. On the other hand, with DTS, you can idle the middle motor, but you wouldn't be able to put the middle motor in reverse independantly of the port, which may be just as bad(?)... Does anyone see an advantage to one system over the other?
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Coast Guard MMSI# - 003669999
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Old 06-04-2010, 06:24 PM
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IMO I would go with twins vs trips any day. Been there done that as they say. Less problems, easier to maintain, runs as well, and the controls are much easier to operate if they are electronic.
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