View Poll Results: Wide Open throttle on my primary boat is:
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My boat is full displacement and will not exceed hull speed
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15 |
19.23% |
WOT is between hull speed and 12 knots
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28 |
35.90% |
WOT is between 12 knots and 17 knots
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11 |
14.10% |
WOT is between 17 knots and 22 knots
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9 |
11.54% |
WOT is greater than 22 knots
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15 |
19.23% |
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01-13-2018, 09:04 AM
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#1
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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WOT on my primary boat is
Wifey B: Discussion about speeds boats owned here will run. Not the speed they're used but their Wide Open Throttle, Pedal to the Metal.
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01-13-2018, 09:11 AM
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#2
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Senior Member
City: Washington
Join Date: Nov 2017
Posts: 468
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I chose hull to 12. When I first bought it (used), it would hit 13 knots but since my wife loaded it up ("we need one of these for the boat") I don't think I can hit more than 12. Maybe less.
I cruise at 7 knots. Actually, I cruise at 2000 RPM and take whatever the current gives me. It's been as high as 12 and as low as 3. Slack water is 7.
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01-13-2018, 09:13 AM
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#3
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by aboatman
I chose hull to 12. When I first bought it (used), it would hit 13 knots but since my wife loaded it up ("we need one of these for the boat") I don't think I can hit more than 12. Maybe less.
I cruise at 7 knots. Actually, I cruise at 2000 RPM and take whatever the current gives me. It's been as high as 12 and as low as 3. Slack water is 7.
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Wifey B: Yes, the question isn't what we do run but what we can run. This is about the boat, not the user.
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01-13-2018, 09:37 AM
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#4
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
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Quote:
Originally Posted by aboatman
I chose hull to 12. When I first bought it (used), it would hit 13 knots but since my wife loaded it up ("we need one of these for the boat") I don't think I can hit more than 12. Maybe less.
I cruise at 7 knots. Actually, I cruise at 2000 RPM and take whatever the current gives me. It's been as high as 12 and as low as 3. Slack water is 7.
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We’re only slightly different.
6 knot cruise, 2300rpm and take whatever the current gives me.
Been as high as 11 and as low as 2.
__________________
Eric
North Western Washington State USA
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01-13-2018, 09:42 AM
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#5
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Guru
City: Gig Harbor
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 9,046
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Loaded as my boat is, I can to between 11-12 knots. Normal cruise is between 7-8
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01-13-2018, 11:19 AM
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#6
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Guru
City: League City, TX
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 1,069
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Running light, on the pins 30+ knots.
__________________
Larry
M/V Pelago
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01-13-2018, 11:27 AM
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#7
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Guru
City: New England and Canada to Florida
Vessel Name: Tadhana
Vessel Model: Helmsman 38 Pilothouse
Join Date: Jul 2011
Posts: 596
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2650 RPM. WOT 9.2 light . 9.0 heavy. I monitor STW by using a paddle wheel transducer. SOG is influenced by current.
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01-13-2018, 12:17 PM
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#8
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Right at 30kts clean bottom and wheel, 2700rpm.
Fast cruise 21kts at 2000.
If diesel is expensive, 7.5kts at 950.
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01-13-2018, 12:19 PM
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#9
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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While mine isn't a displacement hull, because of the repower it won't exceed hull speed. Think the poll might be more useful if the 3 choices had been:
1. Hull speed and below
2. Plowing (above hull speed and below planing [square root of waterline length x 2])
3. Planing
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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01-13-2018, 12:20 PM
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#10
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,663
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The last time I operated mine at WOT was immediately after the re-power, (June 2000) with the mechanic aboard. I think the speed was about 10 or maybe 10.5. The fwd visibility was hampered by the height of the bow, as the stern had fallen into a deep hole. Why I would ever go to WOT again, I don't know.
At cruise, max speed and min speed are about 8.5 and 7.5.
__________________
Keith
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01-13-2018, 12:25 PM
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#11
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Guru
City: Gig Harbor
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 9,046
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Quote:
Originally Posted by koliver
The last time I operated mine at WOT was immediately after the re-power, (June 2000) with the mechanic aboard. I think the speed was about 10 or maybe 10.5. The fwd visibility was hampered by the height of the bow, as the stern had fallen into a deep hole. Why I would ever go to WOT again, I don't know.
At cruise, max speed and min speed are about 8.5 and 7.5.
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Same here. This last summer after the new engine was installed. WOT is loud, expensive, and uncomfortable with the bow reaching for the sky. (Well, not quite as I did use the trim tabs. One of the few times they made a big difference.)
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01-13-2018, 12:39 PM
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#12
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
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When I first got Willy didn’t go over 6.5 knots.
But I thought I should go WOT to see how she ran and check my prop loading. So I ran her up and only got 2750rpm. Needed 3000. I continued on for about 5 minutes and the engine suddenly quit. I was in a narrow channel and ranout to deploy the anchor. After a few more minutes I started the engine like it didn’t have a problem. It did. But I had no idea it did until I ran WOT.
Henceforth it has been one of my engine checks. Every several months I run WOT for about 5 minutes.
__________________
Eric
North Western Washington State USA
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01-13-2018, 12:46 PM
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#13
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
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Quote:
Originally Posted by O C Diver
While mine isn't a displacement hull, because of the repower it won't exceed hull speed. Think the poll might be more useful if the 3 choices had been:
1. Hull speed and below
2. Plowing (above hull speed and below planing [square root of waterline length x 2])
3. Planing
Ted
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Ted to equalize for boat length your #2 would be more specific if it was to read “.8 x hull speed to” something like “1.5 to perhaps 2 x hull speed”.
__________________
Eric
North Western Washington State USA
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01-13-2018, 12:55 PM
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#14
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Guru
City: Adelaide
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 3,218
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Displacement hull. My WOT speed with a slack tide and a clean bottom is about 7.5 knots in flat water. In average conditions with 3-5 foot waves I usually lose a knot.
It's fairly rare that I run at WOT. That last 0.5 of a knot doubles both the engine noise and the fuel usage.
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01-13-2018, 01:00 PM
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#15
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Guru
City: Cypress Landing Marina (NC)
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 1,305
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WOT for a brief time at the end of a run. 14K at 3700 rpm's gets the turbo exercised..
Normal cruise is 7.2K at 2000 rpms...
SD hull, 200 hp Volvo
__________________
Steve
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01-13-2018, 02:42 PM
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#16
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by dhays
Same here. This last summer after the new engine was installed. WOT is loud, expensive, and uncomfortable with the bow reaching for the sky. (Well, not quite as I did use the trim tabs. One of the few times they made a big difference.)
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Wifey B: No problems since they repowered you? It was a PITA but they did step up didn't they?
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01-13-2018, 02:44 PM
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#17
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Guru
City: Gig Harbor
Vessel Name: Kinship
Vessel Model: North Pacific 43
Join Date: May 2015
Posts: 9,046
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Quote:
Originally Posted by BandB
Wifey B: No problems since they repowered you? It was a PITA but they did step up didn't they?
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No problems at all and yes, Cummins Northwest really came through. So far 107 hours on the new engine that was put it in July. Having a grandkid for the first time slowed down our boat usage this fall.
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01-13-2018, 02:45 PM
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#18
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Guru
City: Fort Lauderdale. Florida, USA
Join Date: Jan 2014
Posts: 21,449
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Quote:
Originally Posted by Nomad Willy
When I first got Willy didn’t go over 6.5 knots.
But I thought I should go WOT to see how she ran and check my prop loading. So I ran her up and only got 2750rpm. Needed 3000. I continued on for about 5 minutes and the engine suddenly quit. I was in a narrow channel and ranout to deploy the anchor. After a few more minutes I started the engine like it didn’t have a problem. It did. But I had no idea it did until I ran WOT.
Henceforth it has been one of my engine checks. Every several months I run WOT for about 5 minutes.
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The WOT run is part of all scheduled maintenance and is really the only way to know. Even with our desire for speed, we don't regularly run at WOT but we do every time we service the engines.
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01-13-2018, 03:34 PM
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#19
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Guru
City: Kitimat, North Coast BC
Vessel Name: Badger
Vessel Model: 30' Sundowner Tug
Join Date: Jul 2012
Posts: 5,946
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WOT on my primary boat is...
pointless.
Quote:
Originally Posted by koliver
The fwd visibility was hampered by the height of the bow, as the stern had fallen into a deep hole.
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Could probably get it up on plane with a fusion reactor propulsion unit (I think Mr. Fusion makes one) but 7 knots is about twice as past as we used to sea kayak, so it's all good
__________________
"The most interesting path between two points is not a straight line" MurrayM
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01-13-2018, 07:32 PM
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#20
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Guru
City: Tri Cities, WA
Join Date: Nov 2012
Posts: 4,406
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During our initial sea trial we ran at WOT for 10 minutes to make sure the boat was propped correctly and also that the engines and cooling systems could handle the heat generated and not let the engines overheat.
WOT is 2130 rpm's and was at 30.3 kts. Don't do that much because we're burning 65 gph. Ouch.
Fast cruise at 80% throttle (~1750 rpm's) yields about 22-24kts.
Hull speed is about 900 rpm's at 9.5kts
Cocktail speed at 500 rpm's yields about 5.5kts.
__________________
Mike and Tina
1981 Boston Whaler 13'
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