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08-08-2018, 05:42 AM
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#1
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Guru
City: Cary, NC
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,841
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Draft on plane
I have always been curious... Does a boat on plane draft more or less water?
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
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08-08-2018, 06:00 AM
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#2
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 26,852
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Less
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08-08-2018, 07:04 AM
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#3
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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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Yep. Less on plane. But hell to pay if you bump and slow down!!!
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08-08-2018, 07:08 AM
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#4
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Guru
City: Galveston, Texas
Vessel Model: 24" El Pescador
Join Date: Nov 2014
Posts: 717
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Yes, less.
My small boat can run on plane in water that I can't float in if I stop.
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Ken Diestler
Galveston, Tx
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08-08-2018, 07:31 AM
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#5
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Guru
City: Cary, NC
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,841
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How much less?
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
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08-08-2018, 07:32 AM
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#6
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 19,067
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You just have to run is shallow water and see when you hit bottom...
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08-08-2018, 07:39 AM
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#7
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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: 12,025
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Yes, but.
A large boat on plane can create a suction in shallow water that will pull the stern deeper than if the boat were in displacement mode. Simply, you can strike bottom with a boat on plane in a depth of water that the boat could transit safely in displacement mode. Have seen it happen with a sportfish in the back channels going to the Hatteras, NC inlet. One minute the boat is on plane, then the stern starts getting sucked down, then the smack as thousands of dollars in running gear damage occurs, engines stop, and the boat glides forward in displacement.
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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08-08-2018, 07:45 AM
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#8
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,700
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Quote:
Originally Posted by Tom.B
How much less?
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Depends. Inboard, outboard, keel, no keel, boat speed, waves. No way to know for sure how much without some very risky testing.
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08-08-2018, 08:27 AM
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#9
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Guru
City: Narragansett Bay
Vessel Model: Grand Banks 36
Join Date: Sep 2016
Posts: 1,735
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Cruise ship increases speed to get under bridge.
Surly not on a plane but ”ballsey” just the same. 
Cruise ship barely squeezes under bridge - CNN.com
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08-08-2018, 08:28 AM
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#10
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Guru
City: Cary, NC
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,841
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Quote:
Originally Posted by High Wire
Depends. Inboard, outboard, keel, no keel, boat speed, waves. No way to know for sure how much without some very risky testing.
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I would agree with that for sure.
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
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08-08-2018, 09:50 AM
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#11
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Senior Member
City: La Paz, BCS
Vessel Name: Ansedonia
Vessel Model: Californian/Carver 52CPMY
Join Date: Dec 2014
Posts: 371
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Quote:
Originally Posted by Easting
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Damn, that IS ballsy!!!!!
Cheers, Bill
__________________
"There is simply nothing more worth while than messing around in boats."
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08-08-2018, 10:22 AM
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#12
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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The bottom is not flat. Have your prop shop and seatow on speed dial.
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08-08-2018, 10:35 AM
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#13
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 5,189
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Here in South Florida we do a lot of skinny water fishing. We typically run on plane to cross shallow water. The water is so shallow that the fish backs and tails come out of the water.
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Parks Masterson
Retired from Hopkins-Carter Marine Supply
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08-08-2018, 10:45 AM
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#14
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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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I've run my boat a good bit in the lower (fla) keys. There are areas that I know well, about a foot deeper than my draw. If I am running slow there, boat gets "squatty" and steering gets weird. If I try to power up on plane, boat will suck down and likely hit.
But if I am already up on step (like 16-22kts), I can feel the boat lift, speed pick up a touch and the wake gets flattened out. Feels good but I sure am on my tippy-toes!!
But this is a light planing hull. A big heavy Hatteras that is hardly planed out will most likely suck itself down into a bigger hole than usual and that will not be a good day.
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08-08-2018, 11:09 AM
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#15
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Guru
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,714
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Oc Diver is exactly right. Bigger displacement boats will suck down in shallow water. speed slows, attitude changes and wake increases.
__________________
Jack ...Chicken of the sea! Been offshore 3 miles once
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08-08-2018, 01:03 PM
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#16
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Guru
City: Cary, NC
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,841
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Interesting. Like I said, just curious. We are 42' with a nearly flat bottom at the stern. A lot like a sportfish hull. The props are, by far, the lowest point on the boat and totally exposed. When we are planing with full trimtabs, she does get up on her toes, so to speak, but I do feel like her ass is in a hole. So really, it's impossible to tell. Maybe it's the same. Id sure like to test it some day with some sort of controlled test.
__________________
2000 Navigator 4200 Classic
(NOT a trawler)
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08-08-2018, 01:54 PM
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#17
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Guru
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,898
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In Vietnam I ran jet drive PBRs that were based on a 31' Uniflight hull. At draft about 24" and on plane 8". I routinely passed over shallows at speed.
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08-08-2018, 02:20 PM
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#18
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Guru
City: Carrabelle, FL
Vessel Name: Morgan
Vessel Model: '05 Mainship 40T
Join Date: Jan 2008
Posts: 2,073
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Parks has it right, at least when it comes to outboards built to run shallow. Jack plate up, motor trimmed part way up, tabs down, my skiff will run scary shallow on plane. Like 6 inches. Of course the consequences of a mistake there are nothing remotely close to running a big boat shallow.
Though I have spent quite a few hours waiting on the ride to come in.
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08-08-2018, 03:46 PM
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#19
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TF Site Team
City: Westerly, RI
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 3,879
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I honestly don't think the draft is affected that much. Look at the hole that is created when the boat is on plane. Technically the hull is at water line, but the waterline is adjusted at the transome to be lower than the surrounded water surface. The stern squats, even when on plane. Any lift gained looks like it's offset by the squatting of the stern.
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08-08-2018, 04:00 PM
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#20
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 5,189
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Quote:
Originally Posted by Dougcole
Parks has it right, at least when it comes to outboards built to run shallow. Jack plate up, motor trimmed part way up, tabs down, my skiff will run scary shallow on plane. Like 6 inches. Of course the consequences of a mistake there are nothing remotely close to running a big boat shallow.
Though I have spent quite a few hours waiting on the ride to come in.
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Once I was fishing with my buddy Darrell down by Turkey Point in Biscayne Bay. Darrell dropped something overboard so he jumped in after it. His cell phone was in his pocket. A while later we got caught on a flat by the falling tide. I started rationing food and water. Went into full survival mode.The wind picked up and it got cold. Darrell and I tried to get out of the wind but no place to hide on this boat. To make it worse we were both soaked from trying to push the boat off the very soft mud bottom. Six hours later we floated enough to push it to deep enough water. That was six miserable hours.
__________________
Parks Masterson
Retired from Hopkins-Carter Marine Supply
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