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How do you define “cruising speed”

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How do you define “cruising speed”

Old 10-01-2020, 07:29 PM
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Default How do you define “cruising speed”

For years I have seen people discussing various speeds, rpms, wot etc and the topic of cruising speed is often discussed as if it is a defined/set speed or rpm. How is cruising speed determined? Or is it more of a subjective thing?

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10-01-2020, 07:36 PM
Muchalucka
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To me, it means best fuel economy on plane.
Old 10-01-2020, 07:32 PM
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I think of it as fastest you can go without guzzling gas. Maybe 4-5k rpms for a 4 stroke. That puts me at 8-10gph and 26-28 mph. If I push it to 35 at wot I’ll be at 15 gph.
Old 10-01-2020, 07:35 PM
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Cruising for me is a speed that is comfortable for you, the boat and the engines. Engines are humming working but not roaring. I don’t look at rpms its more a feel for the sound
Old 10-01-2020, 07:35 PM
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Originally Posted by Xjclint View Post
I think of it as fastest you can go without guzzling gas. Maybe 4-5k rpms for a 4 stroke. That puts me at 8-10gph and 26-28 mph. If I push it to 35 at wot I’ll be at 15 gph.
a combination of this and speed at which you can run without getting beat to death. Personally I want a boat that runs comfortably and reasonably efficient at 35 or so, and still handles good and easily stays on plane all the way down to 20. This covers my needs and typical conditions well.
Old 10-01-2020, 07:35 PM
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Originally Posted by Xjclint View Post
I think of it as fastest you can go without guzzling gas. Maybe 4-5k rpms for a 4 stroke. That puts me at 8-10gph and 26-28 mph. If I push it to 35 at wot I’ll be at 15 gph.
my 31 year old 2 stroke guzzles gas when I just look at it. But that makes sense
Old 10-01-2020, 07:36 PM
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To me, it means best fuel economy on plane.
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Old 10-01-2020, 07:37 PM
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I define it as the most fuel efficient speed on plane, with boat fully planed and sustained. For my boat, about 30-32 mph.
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Old 10-01-2020, 07:37 PM
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Subjective. For my ride cruising speed is the g spot on the binnacle. 4000 rpms ~31 mph 3mpg very nice assuming it’s not too rough. It’s awesome 😀
Old 10-01-2020, 07:39 PM
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Absolutely a subjective judgement, but for me, being a cheap skate, it’s the speed at which my boat gets the best fuel economy.

For others it may be the speed at which the ride is most comfortable.
Old 10-01-2020, 07:42 PM
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It totally depends on the boat, engines and what you are comfortable with. In my boat it is 15kts at 2800 rpm and 1.5 mpg
Old 10-01-2020, 07:48 PM
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Another factor is hull type -- a stepped hull will seem sorta OK at a slow cruise speed, but improves dramatically with just a little more RPM added to have the hull 'pop free'. My boat, for example, seems like it's working a bit when I try to cruise at 32 mph - bump it up to 37 or 38 and everything seems to be better. The ride improves as the hull attitude flattens -- there is less load on the engines as the boat seems to cut through the waves instead of smashing into them. Harder to describe than to experience.

Now I understand why people tell me, "If you are getting wet, you just aren't going fast enough." Very true in many sea conditions with my boat...
Old 10-01-2020, 07:53 PM
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Originally Posted by PPLEPEU View Post
Another factor is hull type -- a stepped hull will seem sorta OK at a slow cruise speed, but improves dramatically with just a little more RPM added to have the hull 'pop free'. My boat, for example, seems like it's working a bit when I try to cruise at 32 mph - bump it up to 37 or 38 and everything seems to be better. The ride improves as the hull attitude flattens -- there is less load on the engines as the boat seems to cut through the waves instead of smashing into them. Harder to describe than to experience.

Now I understand why people tell me, "If you are getting wet, you just aren't going fast enough." Very true in many sea conditions with my boat...
when my guests start getting wet they always yell at me to slow down. Still can’t get some of them to understand the opposite is true
Old 10-01-2020, 07:54 PM
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For me cruising speed is a reasonably fuel-efficient reasonably comfortable speed that you generally use when going somewhere in not too much hurry.

My boat seems to like two particular states which I call slow cruise and fast cruise. Slow cruise is 3500-3600 rpms and 22-24 knots. Fast cruise is 4000-4200 rpm and 28-30 knots.
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Old 10-01-2020, 07:55 PM
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Its alot of what was said here. It's all about feel and sound, for my. Craft. The sweet spot is right around 4000 rpms, and 23 or 24 knots give or take depending on tide, load etc...that' equates to 7 or 8 gph.under most conditions with a 16 year old 2 stroke.
Old 10-01-2020, 08:05 PM
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Cruise for me is a speed the boat stays on plane and not beat my live bait to shit, if you fish on the West Coast the name of the game is "range and bait", to arrive on the fishing grounds with beat up bait is like going to the house of ill repute for a kiss.
Old 10-01-2020, 08:13 PM
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It’s the speed between cocktail speed and wide open
Old 10-01-2020, 08:20 PM
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Originally Posted by Rockfish9 View Post
Its alot of what was said here. It's all about feel and sound, for my. Craft. The sweet spot is right around 4000 rpms, and 23 or 24 knots give or take depending on tide, load etc...that' equates to 7 or 8 gph.under most conditions with a 16 year old 2 stroke.
sounds about right. Except I’m up around 20 gph unfortunately
Old 10-01-2020, 08:48 PM
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It’s 100 RPM below ludicrous speed. Study you manual.
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Old 10-01-2020, 08:53 PM
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cruising speed- depends on the boat, sea conditions, comfort of ride, and efficiency/performance-very subjective
Old 10-01-2020, 09:55 PM
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Typically on a diesel the engine manufacture will say it is about 80% of rated HP and able to be run continuously at that speed.

I think that is the upper end of the "cruise speed" definition in my book. There is a happy place each boat has that just feels right. My CC feels really good at about 4200rpm, the mothership is comfy between about 2200-2500rpm. I am a touch over-propped for load most of the time so I try to stay to the lower side of that range.

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