[aerohead]

Originally Posted by kach22i

I found something odd, and if all "fluid dynamics" are fair game then explain the advantage of the gap/slot before the movable portion of the rudder.

MORE random pics...... - Page 4443 - Pelican Parts Technical BBS


I have an idea or two but want to see if it matches anyone else's ideas.

My guess is,that it's about the 'acoustic' signature of the boat,which an electronics officer aboard an 'enemy' vessel might pick up as an anomaly, when dived.
At zero-yaw of the rudder,the water coming to it would be 'clean',as well as the water coming off it.
A common 'slot' between the two might generate more 'noise.' Potentially 'deadly.'