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Horatio Phillips' Feb 21, 1908 To the Editor of Engineering Sir - ... In my experiments - and I believe that during the last forty-four years I have made a greater number than anyone else - I have found it necessary to use a propeller 7ft in diameter, when driven by 20 brake horse-power. This was the proportion in my last machine. The thrust or pull was 220lbs: of course, the thrust would not be so much when the machine was under way. With regard to the form of the blades I use, ocular demonstration of their efficiency was not publicly given until 1893, when several of our leading engineers were present at a public trial of my flying machine at Harrow. Many of my visitors were much interested in the form of the blades, and, at their request, were supplied with specimen pieces. (These blades lift upwards of 70lbs per horse-power, which is more than double that provided by any other means.) ... Yours faithfully, Horatio
Phillips
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