Talk:Boeing 314 Clipper

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Engines

There seems to be considerable confusion about the model of Wright R-2600 engine installed in the 314

Researching the following:

Bowers, Peter M.: The Great Clippers

Griffith, Dai: PILOT’S Boeing Model 314 “The Clipper” for MSFS Part 1: The Aircraft

Trautman, James: Pan American Clippers: The Golden Age of Flying Boats

Wright Aeronautical Division: Curtis Wright Corporation: Historical Engine Summary (Beginning 1930). This is an official Wright document and so can be considered as a primary source.

Boeing 314

Wright GR2600A2 - Wright Aeronautical Division, page 13

Wright GR-2600-A2A – Griffith, pages 6, 10. States it has an output of 1500 hp. The Wright document states the "A2A" has a 1600 hp rating.

Wright R-2600-A2 – Bowers, pages 26 and 32

Wright 709C-14AC1 - http://www.flyingclippers.com/B314.html

Wright R-2600 A2 - https://www.thisdayinaviation.com/tag/nx18601/

Wright 332C-14AB1 - Rated a maximum of 1200 hp and 1550 hp for takeoff. As stated in the 1943 report of the Civil Aeronautics Board into the crash of Yankee Clipper which was a 314. See http://aviation-safety.net/database/record.php?id=19430222-0. "332" is the spec code for the GR2600A2.

While the Wright document and the CAB report state a maximum 1550 hp rating all of the secondary sources state a 1500 hp rating. Either (a) the official Wright document is incorrect or (b) the engine rating was rounded down to simplify descriptions. (an historic Wright poster on page 29 of Griffith states 1500 hp).

Boeing 314A

Wright GR2600A2A --Wright Aeronautical Division, page 13

Wright GR-2600-A2A –Trautman, page 157

Wright AC1 – Trautman, page 63. The Wright document lists a 709C14AC1 engine which has a 1600 hp output, but does not assign it to an aircraft. It is the same size and weight as the A2A but runs on 122/143 octane.

Wright GR-2600-A25 – Griffith, pages 6 and 22. The “5” suffix could be a typing mistake.
Wright 579CI 4AC 1 – Bowers, page 26. I believe Bowers is referring to the GR2600A2A as in the Wright document this has a “579” model specification code.
Wright GR2600A5 - Aeroplane magazine. See https://www.key.aero/article/board-boac-wartime-flying-boat
Wright R-2600-579-C-14 AC-1 - As stated in the report of the Civil Aeronautics Board into the loss of the "Bermuda Sky Queen". which was a 314A. See https://asn.flightsafety.org/wikibase/336872. "579" is the spec code for the GR2600A2A.

John Prattley (talk) 03:54, 14 October 2024 (UTC)[reply]

While the Wright document states a maximum 1550 hp rating all of the secondary sources state a 1500 hp rating. Either (a) the official Wright document is incorrect or (b) the engine rating was rounded down to simplify descriptions. (an historic Wright poster on page 29 of Griffith states 1500 hp). Or (c) the engine was derated, most likely for reliability reasons. Speculation on my part. Carguychris (talk) 20:38, 14 October 2024 (UTC)[reply]

Undefined footnote

John Prattley! In this edit you added a footnote dependent on a citation named "SDASM-71". There's no such citation defined here, tho. Maybe you meant "SDASM-7", which you added? But maybe you intended some other reference. Are you able to clear up this error? -- mikeblas (talk) 00:34, 14 November 2024 (UTC)[reply]

Thanks Mike,

I saw that error yesterday and have corrected it to "SDASM-7".

Many thanks for raising the issue. John Prattley (talk) 04:14, 16 November 2024 (UTC)[reply]

Thanks for the fix! -- mikeblas (talk) 17:11, 16 November 2024 (UTC)[reply]