Prop position from hull

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Maybe it's a propeller on a airplane & a wheel on a boat,
 
If it is a twin screw. Is that getting some twice?
 
I'm think'in the prop clearance should be more w a lot of pitch and since our trawlers generally have little pitch we could get by w less clearance. Also most trawlers are built heavier and would suffer less form the noise generation from the hull vibrating.
 
Prop scew is another factor: more scew means less prop beating on the hull, so clearances can be smaller...
 

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