[MHml] Inclining experiment in air

[rob dalton]

You seem to have it covered. Especially using a range of values to get a statistical result.
   Robert

Peter Southwood <peter.southwood at telkomsa.net> wrote:
          Hi Robert,
  I am busy working on a spreadsheet to do just that. I need to work out the angle for best accuracy and a few other details, but that does seem to be the most practical solution. 
  I will have to find a local supplier to rent a few 10 tonne load transducers, and have a few pivoting support cradles built, so I can get accurate position of the reaction points. I was thinking two load cells spaced along the fixed height side and one on the moving side.
  First test would be level to find mass and check CG is laterally centred, or get offset, as this will have a big effect on accuracy, specially for small angles. Then jack the moving side both up and down and use the values for several angles to calculate VCG, for a statistically reliable result. 
  If you have any ideas or comments I would like to hear.
  Cheers,
  Peter
    ----- Original Message ----- 
  From: rob dalton 
  To: Informed discussion of multihull issues 
  Sent: Thursday, December 14, 2006 1:52 AM
  Subject: Re: [MHml] Inclining experiment in air
  

  It should be possible to calculate by putting some scales under one side of the boat and jacking up the other side,  measuring the difference in weight on the scales and doing some basic triginometry
   Robert

Peter Southwood <peter.southwood at telkomsa.net> wrote:
  Well knock me down with a feather!
I have had a copy of PNA for about 25 years, and never noticed that 
paragraph before (more accurately, I dont remember noticing it before, which 
is not quite the same). OK, mine is an earlier edition and doesnt have the 
illustration, but the text is much the same. I didnt even think of looking 
there.
The method is pretty simple in principle, but for a 15 tonne boat could be a 
bit awkward, as there is not enough headroom in the workshop and no hoisting 
equipment that can support the boat.
Could be tricky.
Thanks again Evan, and well spotted.
Cheers,
Peter

----- Original Message ----- 
From: "Diane Selkirk" 
To: "Informed discussion of multihull issues" 
Sent: Tuesday, December 12, 2006 6:07 AM
Subject: Re: [MHml] Inclining experiment in air


>I found the procedure for Peter in Principles of Naval Architecture. None 
>of my colleagues had heard of it either but we all read the procedure with 
>interest. Anybody want a copy of the PDF, email me OFF list please
>
> Evan Gatehouse
>
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