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Old 05 January 2014, 15:22   #11
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That's a good contender, I wonder what the bracket in the side was for
Hobie Mirage Drive Sport Kayaks for sale from Cornwall Canoes

Some boats / canoes have a dynamic foot drive that use fins like this. Could be something like this. Did you see a lifejacket marked with SIMCAL on it by any chance?
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Old 05 January 2014, 15:46   #12
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Too robust for a canoe I'm afraid
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Old 05 January 2014, 15:58   #13
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Cruise missile?
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Old 05 January 2014, 17:01   #14
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Cruise missile?
. We are starting to head towards the bilge now Pete
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Old 05 January 2014, 17:12   #15
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. We are starting to head towards the bilge now Pete
Long way yet before I get called a boring twat or similar....

Maybe it's off iron mans suit?

It could look very like the fin off my shark outfit...or like you said biff...blade off an auto helm makes sense.

I've never seen one with what looks like plastic molding round the top...that looks like it's failed....

Dingy rudder?
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Old 05 January 2014, 17:15   #16
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Dingy rudder?
I did think that as it seems to be PICO yellow but looks too thick for me.

Plane off an ROV or similer makes sense.
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Old 05 January 2014, 17:18   #17
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I did think that as it seems to be PICO yellow but looks too thick for me.
.
I thought they drop on pins still?.but it's that sort of thing. Hmm.....
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Old 05 January 2014, 17:26   #18
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Given your location I'm guessing its off an ROV.
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Old 05 January 2014, 18:29   #19
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Given your location I'm guessing its off an ROV.
I thought that, or a sonar drogue. Either way it's a nice find for a bit of flotsam. I'll have a tinker with it to see if there are any other identifying features.
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Old 06 January 2014, 15:28   #20
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The engineering on the metal looks quite substantial and of a good quality - but the plastic is not a material normally used in larger boats. There are some smaller multihull types that might use this - like WETA Trimarans. Interesting conundrum - am still inclined to think it is off some sort of beach / cat / pedalo.
You were right about the quality of the metalwork. Stainless steel 316 throughout, including a a woodruff key. The slotted head (bit that sheared) was held in place with circlips. The section with the broken off plastic is also lined with plastic, acts like a nylon bush to stop metal on metal contact. Quality.
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