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>> Home > Forum > Hobby Chit Chat! > Design bits
Design bits
(504 views)
Author Message
bellman1942
(Chief Petty Officer)





Forum Posts: 6
9th Mar 2017 08:17  
>> Permalink
mdlbt.com/26604

How do I calculate the CLR of my new Thames barge,I know it has to be within 10% of the waterline length behind the CofE of the sail plan I need this data to place the fin and ballast.

Dave M
(Fleet Admiral!)





Forum Posts: 1227
9th Mar 2017 08:55  
>> Permalink
mdlbt.com/26605

Hi Bellman
I found this on u-tube which may help https://www.youtube.com/watch?v=Zdv0xVFuh60.
There are other posts on U-tube that also cover this topic.
For the benefit of our members who may not be so savvy on your CLR and sailing boats Wikipedia explains https://en.wikipedia.org/wiki/Center_of_lateral_resistance.
Hope this helps but I hope some more knowledgeable member will post their own method of calculation.
Good luck and please post details of how you decide where you place your keel and balance.
Dave


Live long and prosper

Dave
bellman1942
(Chief Petty Officer)





Forum Posts: 6
9th Mar 2017 15:45  
>> Permalink
mdlbt.com/26610

Thanks Dave will advise .
Bellman

tomarack
(Lieutenant)





Forum Posts: 17
4th Jun 2017 20:35  
>> Permalink
mdlbt.com/29700

Hi,
I can reccommend articles by Ivor Bittle too ... late - but still...
2.12 How to locate the fin and the mast of a model yacht
on Ivor B.pages ( http://www.ivorbittle.co.uk/ )
On his pages you can find very helpfull articles about Thames sailing barges..
Wishing success
Tom


Main principle: if It is not broke - do not repair It !
tomarack
(Lieutenant)





Forum Posts: 17
4th Jun 2017 21:04  
>> Permalink
mdlbt.com/29701

Hi,
some next words yet..

Let me quote some comments from Kimosuby here too..

Still, with out resort to complicated calculations etc most model bargees decide to add a keel. Note; not a fin as this implies a thin item, but a good area of keel. Its position is most usual, on a 1/24 scale barge, with it’s leading edge 3 inches behind the front edge of the mast. It’s purpose is to inhibit leeway, which on such a small flat bottomed hull, is quite large.
Visual examination of the barge profile (all scales) shows that this is also the position that the leeboards occupy when lowered, so if it was a good position for the full size barge builders, then it’s probably good for us modellers too.
............
I asked Ivor Bittle too, and he gave me the same advice.
he wrote in short ... The location of the CLR should be located approximately on the vertical axis at a location corresponding to the center of the wetted surface of the leeboard located downward approximately at an angle of 45 °- 60°

.. if something looks good, then it's good ...

Before all --as I can see .. you have to use rule of thumb .. 😊

The Universe in which we live is supremely untrustworthy (Douglas Adams)

Greetrings 😉
Tom


Main principle: if It is not broke - do not repair It !
cenbeth
(Admiral)





Forum Posts: 164
4th Jun 2017 21:48  
>> Permalink
mdlbt.com/29703

Hi,

Please pardon my ignorance, but what does CLR stand for?

Edward

tomarack
(Lieutenant)





Forum Posts: 17
4th Jun 2017 22:17  
>> Permalink
mdlbt.com/29705

Hi,
CLR - Center of lateral resistance - its size is given by the lateral surface of the submerged part of the ship.
  Lateral. [Latina], surface area - total submerged surface of the side elevation of the vessel--
Center of lateral is important for determining the balance of sailing considering wind pressure.

Please forgive me some minor translation problems ..

Tom


Main principle: if It is not broke - do not repair It !
RNinMunich
(Fleet Admiral!)





Forum Posts: 589
4th Jun 2017 22:21  
>> Permalink
mdlbt.com/29707

or Lateral resistance ? 😎


"Retirement is when you stop living at work -
and start working at living/boat modeling!" 舰队的海军上将 😉 Doug
tomarack
(Lieutenant)





Forum Posts: 17
4th Jun 2017 23:07  
>> Permalink
mdlbt.com/29709

Hi,
I've already fixed it ...
Tom


Main principle: if It is not broke - do not repair It !
cenbeth
(Admiral)





Forum Posts: 164
5th Jun 2017 08:03  
>> Permalink
mdlbt.com/29722

Hi Tom

Thank you for this. You have added to my knowledge; not that there was much there!

Regards

Edward