F-11 from The American Fokkers: Part 3, Pete Bowers, AAHS Journal 1967, Vol.12 No. 3.
F-11 and F-14 drawings from Aircraft Year Book 3-view Drawings 1903-1946, J.W. Mc Donald
MODEL 9 - This flying boat/amphibian was the only Fokker to carry separate designations for the American and Dutch versions. The American version was designated F-11 and the Dutch was B-lV in a continuation of the long-established B flying boat and amphibian series. There was also a Dutch F-Xl model at this time. lt had strut-braced wings like the American Universal and was also called "Universal." Like the American F-Vll's, the F-11/B-lV's were a joint Dutch American effort. The metal hulls, direct developments of the metal B-III hulls, were built in Holland. There is no evidence that any complete B-lV's were built in Holland. The Dutch catalog photos and entries in the Dutch section of JANE'S ALL THE WORLD'S AlRCRAFT show an American-registered F-11.
F-11 - This was a logical monoplane development of the B-III pusher biplane flying boat and was assembled at Teterboro. The hull lines were generally the same except that they were developed into a full cabin design. Only one F-11, 7887, C/N 901, was built. (C/N 900 appears in FAA records as a B-II with Napier Lion engine.) The F-11 originally appeared as a six-place amphibian with unique retractable wheel-sponsons in the manner of the German Dornier boats. A wheel was mounted on the end of each sponson, which was lowered for ground operation.
For water operations, the sponson retracted to the horizontal position and the wheel folded back and out of the way. This arrangement was not very satisfactory and was soon abandoned. The F-11 was then converted to a straight flying boat with conventional wing floats mounted much farther inboard than on contemporary designs.
The F-11 originally used a Super Universal wing in what was planned as a neat saving in engineering and tooling costs. The original engine was a 420 hp Pratt & Whitney Wasp. The F-11 was then converted to use a longer 500 square foot wing and a 525 hp Wright Cyclone engine and received Category 2 certificate 2-163 on December 6, 1929.
F-11A - Three 8-place F-11A's (C/N's 902, 903 and 905) were built. These could be purchased as straight flying boats or as amphibians with separate fixed-wing floats and retractable landing gear. The other major difference from the F-11 was the use of a longer wing with 550 square foot area. This was the same wing used on the model F-14. Engines were advertised as the 525 hp Wright Cyclone and the 575 hp P&W Hornet. ATC-222 was issued to the Cyclone-powered F-11A on September 5, 1929. Price of the flying boat was $40,000 and the Amphibian $42,000. These were reduced to $32,500 and $33,775, respectively, when the depression began to affect airplane sales in 1930. The last F-11A was delivered in June 1930.
F-11AHB - This designation shows up in FAA records for two airplanes, C/N's 904 and 905. No documentation has been found to explain the additional letters in the designation. A latter-day collectors photo shows one with a modified vertical tail, but this would hardly cause Fokker to change the designation. Since the FAA records show them fitted with the P&W Hornet engine, a guess would be that the letters HB stood for "Hornet B". C/N 904, which was registered 127M, was licensed 8-place under Category 2 certificate 2-172 and C/N 905 (which later went to Canada) was licensed under 2-200 as 10-place.
F-11A TANDEM - No special designation appears for F-11A, X-148H, C/N 902, when it was temporarily fitted with two Hornet engines in tandem. Again, no documentation is available, but the sequence of photo numbers and dates indicates that the purpose of the twin was not to serve as a test bed for the tandem engine installation of the F-32 transport but rather was an attempt to adapt the F-11 to the Coast Guard's requirements for a twin engine flying boat by fitting an F32 nacelle to an existing single engine aircraft.
Span:50' 7 3/4" (later increased); Length:42' 11", Area:370 ft2(later increased to 500)
Span:59' 0"; Length:45' 0", Area: 550 ft2
The 1929 F-11 drawing shows the original 'retracting sponson' design and Super Universal wing.
Obviously Lloyd Jones copied that drawing when he did 'his' F-11A drawing, which is clearly not
the F-11A. I've included the F-14 3-view for completeness.