orcas attacks... which protection for rudder and fins on trawlers?

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@JDCAVE : yes of course, Dean Yule ( Keypower ) would like also to know how fins on starboard and portside will perform with these small spikes ( 2 cms) screwed with 4 mm in the solid part of the polyurethane material. As well, easy to remove underwater. I will of course make the report.I hope this will discourage orcas to push the fin with their nose creating the pressure required to broke it. I do not pay attention to the blablah of green lobbies and pseudo scientists who cry and talk and talk, but do not own yachts or trawlers, or do not go out from their marinas
 

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