Douglas Model 640 "Seaplane A-4"

[Orionblamblam]

Already discussed here (http://www.secretprojects.co.uk/forum/index.php/topic,258.0.html), but I thought these diagrams might be of interest on their own:

 

[overscan (PaulMM)]

Thats real pretty, though a fair way from the eventual A-4.

 

[Stargazer]

Very interesting! Is it me, or is this design reminiscent of the Grumman Panther/Cougar in some way?
I guess it's the side view that gives me that impression, the rest has nothing to do with it !

 

[Stargazer]

More on the Douglas Model 640:

 

[Grey Havoc]

The initial version was capable of being launched from a P.T. boat?!

 

[Vahe Demirjian]

The initial version was capable of being launched from a P.T. boat?!

The Model 640 was actually designed to be launched from the nuclear-powered submarine USS Halibut. There is an additional drawing of the Model 640 at this link:

Submarine aircraft

 

[Grey Havoc]

I know, but the P.T. boat was apparently pitched as an alternative option (for Special Operations support and the like, I wonder?).