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Author Topic: Why do ships lean to the outside, but boats lean to the inside of a turn?  (Read 1547 times)

Martin (Admin)

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Why do ships lean to the outside, but boats lean to the inside of a turn?
« on: October 13, 2021, 07:18:21 pm »

Why do ships lean to the outside, but (planing) boats lean to the inside of a turn?



                             
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Umi_Ryuzuki

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #1 on: October 13, 2021, 07:39:32 pm »
Rudder force on a planing boat vectors the thrust to the inside and the relative light top weight allows
the hull to kick out, making the boat lean in. The opposite is true for larger ships. Just the sheer amount 
of top weight causes it to lean out in a turn.
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derekwarner

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #2 on: October 14, 2021, 12:16:28 am »
Umi has it :-))  simply the metacentric point of balance .....[actually quite similar to the Leaning Tower of Piza]........Derek


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Martin (Admin)

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #3 on: October 14, 2021, 01:34:54 am »
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Howard

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #4 on: October 14, 2021, 10:19:33 am »
Hi Martin,
 Well on my last ship it never leaned out or in mind it was a 215,000 ton tanker with a 70ft plus draught took a bit to stop tho
                   Regards Howard.
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jaymac

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #5 on: October 14, 2021, 10:48:12 am »
Alas the Beeb has blocked Clarksons  Handbrake turn  in Artic convoys but these are good


https://www.youtube.com/watch?v=mzveUz-WRGQ

https://www.youtube.com/watch?v=EtkpDV6Gq0c
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Geoff

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #6 on: October 15, 2021, 03:12:36 pm »
No a handbrake turn but a nose dive!


https://www.youtube.com/watch?v=Zvzld04Q5XI


Geoff
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Akira

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #7 on: October 16, 2021, 01:06:35 pm »
Ah, ha. Now please answer me this: why do submarines lean into a turn when submerged?
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Colin Bishop

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #8 on: October 16, 2021, 01:22:17 pm »
Quote
Ah, ha. Now please answer me this: why do submarines lean into a turn when submerged?

Because they are essentially 'flying' underwater and behave like an aeroplane.

Colin
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Akira

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #9 on: October 16, 2021, 01:28:46 pm »
Thanks Colin, I agree with your point, except that airplanes use ailerons to to induce the banking in order to counter centrifical force and prevent the aircraft from skidding, no? While some subs, Seawolf class, do have aileron style planes, most do not. I am still scratching my head on this.
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Netleyned

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #10 on: October 16, 2021, 04:40:42 pm »
Ask any Submariner.
A submarine is a boat, not
a ship so will obviously
roll inwards on a steep turn.
 :D .
Ned.

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Akira

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #11 on: October 16, 2021, 05:15:45 pm »
 :embarrassed: :o ;D ...I t'ink I've been edacated........ {-)
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Netleyned

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #12 on: October 16, 2021, 05:35:04 pm »
 :-))


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malcolmfrary

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #13 on: October 18, 2021, 06:10:05 pm »
If you have a block of mass below the centre, it will, in a turn, try go go straight on, so the top of the craft tries to lean in.  If there is enough weight to give some inertia higher up, that also tries to go straight on, so the top tries to lean out.
Lots more factors like rudder angles and hull shapes. 
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RST

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Re: Why do ships lean to the outside, but boats lean to the inside of a turn?
« Reply #14 on: October 27, 2021, 09:41:58 pm »
...to be honest probably because folk keep recirculating questions that have been out there for a while but not all the replies out there to them since that helps explain it.
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