Sunday, May 28, 2017


Towards the end of WWII the USAAF was developing a dedicated ground attack plane. This was the Douglas A-1 Skyraider, a piston-engined behemoth which came too late to participate in WWII, but which performed admirably in the Korean War and also in the Vietnam War. But before that war had even started, the Skyraider's successor had already been developed. This was the Grumman A-6 Intruder, a twin-engined, mid-wing design with a relatively small airframe but which nevertheless could carry an amazing load of ordnance (some 8,200 kilograms on its 5 hardpoints).

The following video is from the 1991 film Flight of the Intruder, a decent warflick directed by John Milius and starring Willem Dafoe, Danny Glover, Brad Johnson and Patricia Arquette. It was based on Stephen Coonts' 1986 novel of the same name.

Below a pic of a cutout of one the Intruder's two Pratt & Whitney J52-P8B turbojets (with a 9,300 lbf (41 kN) thrust each).

 photo intruder_engine_zpsg5itpbyw.jpg

You can actually only see the compressor section and the combustion chambers (although one turbine ring is visible to the extreme right of the photo).

Duh. I don't believe a word of it. When I checked out the Pratt and Whitney J-52 the wiki page told me that it was an axial turbojet (of course) but dual spool, see the difference below:

 photo dualspoolturbojet_zps2pjywkpl.jpg

And here is a more relevant pic. You can clearly see from left to right the low pressure compressor, the high pressure compressor, the combustion chambers, the high pressure turbine and the low pressure turbine.

 photo j52_zpsnim1y8a3.jpg

Yet the photo of the first cutaway shows a single spool engine. And this while the Flickr account where I found it labels it as an A-6 Intruder engine, put on display at Patuxent River Naval Air Museum, Lexington Park, Maryland.

Oh well. Maybe someone among our readers has an explanation?

Another video, though not from the movie, but a documentary:



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