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Aviation History
1925
1925 - 0058.PDF
JANUARY 29, 1925 Making Fairey- Reed duralumin airscrews. This machine twists the duralumin " plank," and in the photograph the two blades are twisted at right angles to one another. before much work has been expended upon it. This naturally effects a not inconsiderable saving. Planks which the tests have indicated to be sound (apart from any defects that may be discovered by inspection) are then allowed to proceed to the next stage in manufacture, and a small specimen of each spar is taken and subjected to destruction tests. One of our photographs shows the testing machine, with a small specimen under test. A record is kept of the characteristics of the test piece, such as its breaking strength, modulus of elasticity, moisture content, weight per cubic foot, etc. In this connection it is interesting to note that as a result of more than 3,000 such tests, the Fairey Aviation Company has been able to discover what appears to be a consistent rule. If the moisture content and specific weight of a piece of spruce are known, its other characteristics can be calculated We had the privilege of being shown a comparative table of characteristics of a number of test pieces, giving both the experimentally-determined and the calculated values, and the agreement was little short of astonishing. The verifica- tion of this law is, of course, of great practical value, quite apart from the direct use of testing samples of each wing spar so that its recorded characteristics can always be looked up at any future date. In addition to wood-testing machines, the Fairey experimental shops are also equipped with engine - S/EEL-PLATE ENGINE MOUNTING OF THE FAIREY "FLYCATCHER": The m four Sect1Ons, the details of the construction and method of joining being shown inthe sketches. , '• ' • 58 • • ?'
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