Fokker F.V
The Fokker F.V was a Dutch airliner created by Fokker in the 1920s. The most interesting property of the F.V was that it could be configured either as a biplane or a monoplane, as the lower wing could be removed. It was not a success and only one was built.
Design and development
There are no surviving records of the early thinking of Anthony Fokker that lead to this unusual aircraft, designed by Reinhold Platz. The idea was that the biplane configuration would be able to lift greater loads because of the greater wing area, whereas the monoplane version would suffer lower drag and be faster. The upper wing was a typical Fokker thick, internally braced design, with ailerons projecting beyond the wingtips, all in the style of the earlier F.III and F.IV aircraft. However, with the F.V it was mounted as a parasol wing, connected to the fuselage by four struts on each side. The biplane conversion was designed to be simple, with the lower wing connected to the upper by simple N type struts, uncomplicated by bracing wires.
FV
FV may stand for:
F5
F5, F.V, F 5, F05, F-5 may refer to:
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Vanadium(III) fluoride
Vanadium(III) fluoride is the chemical compound with the formula VF3. This yellow-green, refractory solid is obtained in a two-step procedure from V2O3. Similar to other transition-metal fluorides (such as MnF2), it exhibits magnetic ordering at low temperatures (e.g. V2F6.4H2O orders below 12 K).
Preparation
The first step entails conversion to the hexafluorovanadate(III) salt using ammonium bifluoride:
In the second step, the hexafluorovanadate is thermally decomposed.
The thermal decomposition of ammonium salts is a relatively common method for the preparation of inorganic solids.
VF3 can also be prepared by treatment of V2O3 with HF. VF3 is a crystalline solid with 6 coordinate vanadium atoms with bridging fluorine atoms. The magnetic moment indicates the presence of two unpaired electrons.
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