longjohnsilver
regular
Reged: 30/05/2001
Posts: 6996
Loc: Devon
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Some manufacturers are not as precise as they should be. That's probably the reason for the difference. Has happened to me in the past., prop several inches out from what was stated.
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Dave_Snelson
regular
Reged: 16/10/2001
Posts: 6038
Loc: Porthmadog / Jawhara Smir / Po...
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Nice way to rack up your cranage fees as well 
I reckon its just that the props really aren't the same. They may look the same, they may be stamped up the same, but they ain't the same. It would take an experienced propeller engineering workshop to show you the difference.
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Morocco and France Apartments
And while you sit and whistle Dixie with your money and your powers,
I can hear the flowers a-growin' in the rubble of the towers...
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MapisM
regular
Reged: 11/03/2002
Posts: 2687
Loc: Italy
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Quote:
Nice way to rack up your cranage fees as well
That's not what I suggested, is it?
How would you use a crane while anchored... 
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MapisM
regular
Reged: 11/03/2002
Posts: 2687
Loc: Italy
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Quote:
prop several inches out from what was stated
Not in this case imho.
+150rpm and +2kts suggest an overall better performance, as after cleaning the hulls/props (which isn't the case either, as Mike explained), or with engines better tuned, or with better fuel, or in salt vs. fresh water, or God knows what else.
Longer or shorter pitch props would have different consequences.
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