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SHFNI Rotractrule

Old 29th Mar 2022, 08:23
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SHFNI Rotractrule

My SHFNI Rotractrule is becoming somewhat dog-eared. Even fablon can't save it. It's a great piece of kit, fits in a flying suit.....

Does anyone have one in their memorabilia collection they'd be willing to trade or let go of? Thanks.
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Old 29th Mar 2022, 09:00
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Obviously a Wessex one because it only goes up to 120 kts!
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Old 29th Mar 2022, 14:45
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Shame you didn't post that about two weeks ago - just had a big clearout!
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Old 30th Mar 2022, 07:46
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Fascinating device. When I looked it up on Google, my quest was self-referential, back to this post!

Some questions:

Where does the name come from?

What was the graph used for?

Who produced 1:20,000 maps? I would have expected 1:25,000.

PS I know what SHFNI means. It's the other bit!

Last edited by India Four Two; 30th Mar 2022 at 22:41.
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