Picture of the day. (15 Viewers)

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U.S. Navy Martin PBM-3C Mariners of Patrol Squadron 201 (VP-201) at Naval Air Station Banana River, Florida (USA), on 13 January 1943 WIKI
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Note the single gun in the nose turret. Later production models of the same variant (C/D) had twin-guns (as seen below).

Those early models had a single gun in the tail as well vs. twin-guns in a rotating turret in the later production.

 
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I count two guns in the nose.
I was talking of the photo in the post I quoted - check the post above mine. Here's a zoom-in with the nose turret with a single gun.

The a/c with the twin guns is for comparison (as described in the second part of my first sentence).
Attached is a short video of the above mentioned single-gun-turret in motion.
Cheers!
 

Attachments

Got it! Thanks.
 
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One needs an explanatory photo to see how this a/c takes off.
But I still ask myself: did this thing fly? With that fan for a propeller?

A small, high-revving propeller can do the job. Not as well as a large, slow-turning one, but still manageable—and probably just enough to get the aircraft airborne and stable.

As a reminder, some Dornier seaplanes also featured movable propeller shafts.
 

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