View Poll Results: Wide Open throttle on my primary boat is:
My boat is full displacement and will not exceed hull speed 15 19.23%
WOT is between hull speed and 12 knots 28 35.90%
WOT is between 12 knots and 17 knots 11 14.10%
WOT is between 17 knots and 22 knots 9 11.54%
WOT is greater than 22 knots 15 19.23%
Voters: 78. You may not vote on this poll

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Old 01-13-2018, 08:51 PM   #21
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58kts @ WOT
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Old 01-13-2018, 09:01 PM   #22
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Quote:
Originally Posted by Padeen View Post
58kts @ WOT
Wifey B: Oh, loved our Cobalt's on the lake, but yours is faster. 640 hp, I'm guessing, on a 29' boat?
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Old 01-13-2018, 09:15 PM   #23
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Not sure because I never run there long enough to verify speed, but Id guess 7.7 kts.
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Old 01-13-2018, 09:41 PM   #24
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Depending on the load, an American Tug 36 with a Cummins 380 turbo can easily reach around 18-20 mph approaching 3,000 rpm.

Best overall cruising taking into account speed, fuel use and range is about 9 mph at 1,600 rpm.
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Old 01-13-2018, 10:08 PM   #25
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Since re-power WOT is 11kn. Previously I could plow at 16.5 kn, and burn 34GPH. I briefly considered increasing engine power rather than reducing it, but knew I would rarely use it.

Even the 200 HP JD's I now have seldom run at more than 1800 rpm/40% load, so have more HP than I need. There were some Mk 1's with twin Lehmans, and although owners might have wanted more speed sometimes, they could run at up to 11 kn as well and were a smart choice for the boat back in the day.
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Old 01-13-2018, 11:34 PM   #26
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WOT is 2400 (M1 rating) providing about 8.5.
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Old 01-14-2018, 08:39 AM   #27
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I clicked on "hull speed to 12 knots" though the boat may do a bit more. I never run at flank speed so I really don't know. Rpm at flank speed on this fully loaded twin Lehman boat is about 2500. Normal cruise is 8-9 knots at 1800 which gets us just about 2mpg. When needed for running an inlet or for other sea state reasons I push it up to 2000-2200 for about 11-12 knots.

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Old 01-14-2018, 10:43 AM   #28
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Old 01-14-2018, 11:56 AM   #29
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Quote:
Originally Posted by Nomad Willy View Post
Were only slightly different.
6 knot cruise, 2300rpm and take whatever the current gives me.
Been as high as 11 and as low as 2.
hey..if you can make it down the Skagit from Concrete at 6 knots, you're my hero.
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Old 01-14-2018, 01:07 PM   #30
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WOT is 30kt
95% of the time it's running just fast enough to keep the egt at 500, 8kts
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Old 01-14-2018, 01:22 PM   #31
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WOT is 30kt
95% of the time it's running just fast enough to keep the egt at 500, 8kts
Wifey B: Another SeaRay I laugh because that's what led to this poll, someone saying this forum wasn't for SeaRay's.
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Old 01-14-2018, 01:30 PM   #32
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Hey, I resemble that remark!
Just finished the loop with our boat, that's trawler enough for me
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Old 01-14-2018, 01:39 PM   #33
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Hey, I resemble that remark!
Just finished the loop with our boat, that's trawler enough for me
Wifey B: And the genesis of the debate was one thinking about a boat for the loop and a gas boat and even a Sea Ray.

How shocking to find out a sizable percentage of boats owned by people on Trawler Forum are not Trawlers. Almost like finding out that a large number of people on Yacht Forums don't own Yachts.

We're a very diverse group of boaters with many shared interests.
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Old 01-14-2018, 01:45 PM   #34
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ctjstr,
I could almost do that in a canoe.
And thinking of shared interests B I have three of them .. canoes.
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Old 01-14-2018, 02:05 PM   #35
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Wide open throttle is 3,000 rpms. On flat water that gives 9.1 knots. Hull speed is 7.6 knots. I like to cruise at 7 knots (2,000 rpms), but my wife prefers that I back off to 1,500 which gives 5.5-5.8 knots. Fuel consumption at WOT is 2.2 gph. It is 0.7 gph at 7 knots and 0.25 gph at 5.5-5.8 knots. The hull is pure displacement with a 9,200 lbs displacement and 32' waterline. I repowered with a Volvo-Penta D2-40 40 hp in 2011.
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Old 01-14-2018, 02:06 PM   #36
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Wide-open throttle is 2400 RPM, generates maximum speed of 7.3 knots (hull speed), the same achieved at 2200. Normal cruise of 6.3 knots is at 1800 RPM, cutting fuel consumption rate by more than half.

Based on survey results to date, only about 21 percent of us have (not-able-to-exceed-hull-speed) trawlers.
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Old 01-14-2018, 03:14 PM   #37
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Wifey B: And the genesis of the debate was one thinking about a boat for the loop and a gas boat and even a Sea Ray.

How shocking to find out a sizable percentage of boats owned by people on Trawler Forum are not Trawlers. Almost like finding out that a large number of people on Yacht Forums don't own Yachts.

We're a very diverse group of boaters with many shared interests.
We met several folks along the loop that were running gassers. Buddy boated with Silverton's, Carvers and Cruisers Inc.'s that were gas. They seemed to be having just as much fun as we were and as long as they ran right around 8 kts or so, didn't burn that much more fuel than us. There were 2 (that we met) Sea Rays that were not only gas but stern drives to boot.
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Old 01-14-2018, 04:06 PM   #38
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ctjstr,
I could almost do that in a canoe.
And thinking of shared interests B I have three of them .. canoes.
Wifey B: We've got no canoes. Have kayaks and paddleboards. Maybe we need a canoe.
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Old 01-14-2018, 05:11 PM   #39
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With a tailwind on a calm day, I saw 19 knots, normally run 8-9 knots.
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Old 01-14-2018, 06:18 PM   #40
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~9.5-10kt at 2100rpm heavy with the wind. Usually cruise 7kt at 1700rpm. The fuel differential isn't worth the 2.5kt.
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