Recent content by Simon Thomas

The prototype B-17 used Pratt & Whitney R-1690 Hornet engines. The Hornet was rather problematic, likely leading to the change to the more reliable Cyclone.

From "Vought F4U Corsair", Martin W. Bowman, 2002, p115-116 The F4U-4 was brought out in the spring of 1943, and was the result of a complete redesign of the Corsair (V-354). The new model, often referred to as the 'Ultimate Corsair', benefited from fifteen major modifications brought about by...

Yes. Profile Publication 150 "The Chance Vought F4U-4 to F4U-7 Corsair"

Pratt & Whitney R-2800-52W,-54 rear cylinder There are no fin restricting strips on the cylinder in the first post, so it may be earlier than the 52W/54.

The rocker boxes seem to be more like Wrights. The finning is relatively thick. It's from the back row of a two row engine - the pushrods and ports are on the same side. What is the bore? Any part numbers?

Doesn't answer your question, but might help. R-2800 Pratt & Whitney's Dependable Masterpiece, Graham White, 2001, p196

Yep. From Shell Aviation News 1937 (Avialogs) lt doesn't mention the model. I suspect it is the 28-90, but that was pretty much the same as the 28-70.

Before I saw this, I didn't know the manufacturer ever made military aeroplanes. A vast majority of their production is small civil types. They were founded in 1927, and are still in business but not making complete planes.

No and No. They were nominally bombers. The Spanish government tried to buy them on a number of occasions.

Yep.

Not Russian.

Between the wars.

Let's try this one:

Avialogs has the parts catalog. Their title does not list the -65, but it is in the document. https://www.avialogs.com/engines-w/wright/item/102725-