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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.
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
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 !
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 .. 😊
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Greetrings 😉 Tom
Main principle: if It is not broke - do not repair It !
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 !
9th Mar 2017 08:17
