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Aviation History
1925
1925 - 0029.PDF
JANUARY 15, 1925 7 THE AVIA B.H.I7 BIPLANE SAND TESTED IT may be recollected that at the Aero Show at Prague lastsummer the Czechoslovak firm of Milos Bondy a spol had previously been asymmetrically loaded, i.e. the wingson one side were loaded with ten and those on the other with exhibited, among other machines, a single-seater fighter, nine load units, a test which they withstood satisfactorily.the B.H.17, fitted with 300 h.p. Hispano-Suiza engine. The letters B.H., incidentally, are the initials of the twoMilos Bondy designers, Messrs. Benes and Hainz, who have The fuselage proved to be 80 per cent, stronger in torsionand 125 per cent, stronger in bending than the prescribed factor. It finally broke under bending load. The fuselage Front view of the Avia B.H.17, fitted with 300 h.p. Hispano-Suiza engine. been responsible for the long series of successful machinesproduced by this very energetic Prague aircraft firm. We now learn that one of the B.H. 17 machines has been sub-jected to sand-loading tests, which it passed with flying colours.The tests were carried out at the beginning of December last under official supervision, and were also witnessed by tests were carried out by sand loading the tail, asymmetricallyfor the torsion test and symmetrically for the bending test. The undercarriage was subjected both to steady loads andto drops from various heights, and came through the tests without breaking. The results are stated to have beenregarded as highly satisfactory, both by the Czech officials and by the French representatives. a H H H H H H El a H m H 13 13 13 m m m m m a a H H H H H H The Avia B.H.17 undergoing sand- loading tests. A factor of safety of 12 • 5 was reached, and then the wings did not break until the load had been sustained for three minutes. H 0 E H H H several French officers. The machine had to comply with theCzech factors of safety of 10 for the wings and 8 for other parts.One of our photographs shows the wings of the Avia B.H.17 under sand test, on which thev withstood a load12-5 times greater than the normal, and partial break did not occur until after a period of three minutes. The wings In our description of the Avia B.H.17 last summer weexpressed some doubt as to the soundness of the peculiar turnbuckle bracing of the single I-struts, but we are informedthat during the recent tests this fitting did not yield to the slightest extent during the whole of the sand loading tests,so that there can now be no doubt of the adequacy of this form of strut-bracing. 20
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