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From: bob mackey <n103md@yahoo.com>
Subject: RE: [LML] Re: TSIO-550 Turbo setup for non-pressurized lancairs
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I've seen this A/R ratio for turbine (or compressor) housings described as the 
  unitless ratio between the inlet (or outlet) area, and the radius. 
  
  But the ratio between an area and a distance will have units of length. 
  So that ratio isn't unitless. It depends on which unit you choose. 
  Now, I think a 0.62 metric turbine housing is the same as an american 
  0.62 turbine housing, so it probably really is a unitless number. 
  
  Is it A / R^2 ? 
  Or the radius to the centroid of the inlet area divided by the scroll housing radius? 
  Or what? I think it might be the latter based on the appearance of typical housings. 
  
  
  
			
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I've seen this A/R ratio for turbine (or compressor) housings described as the <br>  unitless ratio between the inlet (or outlet) area, and the radius. <br>  <br>  But the ratio between an area and a distance will have units of length. <br>  So that ratio isn't unitless. It depends on which unit you choose. <br>  Now, I think a 0.62 metric turbine housing is the same as an american <br>  0.62 turbine housing, so it probably really is a unitless number. <br>  <br>  Is it A / R^2 ? <br>  Or the radius to the centroid of the inlet area divided by the scroll housing radius? <br>  Or what? I think it might be the latter based on the appearance of typical housings. <br>  <br>  <br>  <p>
	
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