This is the result of someone painting copper based anti-foul onto an Aluminium Propellor. The anti-foul was also painted into the stern leg with as disarstrouse results. Infact, the corrosion had gone right through the leg allowing water to enter the gearbox.
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CaptainK BMYC "Those who desire to give up Freedom in order to gain security, will not have, nor do they deserve, either one." - Benjamin Franklin