Schneiderman

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In July 1945 Supermarine had not yet finalised their design for the Type 392 Attacker. This drawing (39200 116) shows one of the alternatives considered; note the design of the tail surfaces, the repositioned air intakes, the four cannon mounted alongside the cockpit, and, of course, the nosewheel undercarriage.
 

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I'd guess that the evolution from this drawing to the final design was mostly driven by the need to save money by keeping the Spitfire-derived wing as intact as possible. That would explain the conventional landing gear and the repositioned inlets.
 
Yes, I think so too. In this design the main uc has been moved backwards, which would have required significant re-engineering of the Spiteful wing.
 
39200 sht116 is the Vickers-Armstrong Supermarine drawing number
 
I've just come actually this concept in your Supermarine Projects bookazine.

Are the actuators around the nozzle a 4 piece speed brake? The hinges and rods may indicate this. Any idea what the items at 12 and 6 o clock are? Or is it a variable area nozzle actuated through cable pulls?

I'm not sure the gun port and intake location would have worked that well. Is there a boundary layer diverter on the original drawings?

The Attacker just looks wrong to me with the wing too far forwards
 

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