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[[Image:1907 flying machine.jpg|thumb|300px|1907 Flying Machine]]
Phillips believed that multiple stacked wing planes (or "sustainers" as he called them), in "Venetian blind" configuration, offered advantages.
* His 1893 Flying Machine had 50 lifting surfaces and used his patented "double-surface airfoils" in such a way as to produce an [[Aspect ratio (wing)|aspect ratio]] of 1:152, providing great lift at the sacrifice of stability. As a test vehicle, it was not designed to be manned, but was used to test lifting capability. Its maximum load was found to be 400 lb.<ref>''A History of Aeronautics'', by E. Charles Vivian</ref>
* His 1904 Multiplane was a developement of the 1893 test vehicle in a configuration that could be flown by a person. It had 21 wings and had a [[tail]] for stability, but was unable to achieve sustained flight. Its best performance was 50 ft.<ref name="Aerospaceweb"/> A specially made replica of the 1904 machine appears in the opening sequences of the 1965 film [[Those Magnificent Men in their Flying Machines]].
* His 1907 Multiplane, which had 200 individual airfoils and was powred by a 22 hp engine wdriving a 7 ft propeller achieved the first successful powered flight in Britain, though he did not claim it as a flight as such. It flew 500 ft on 6 April 1907.<ref name="Aerospaceweb">[http://www.aerospaceweb.org/question/history/q0232.shtml Aerospaceweb.org | Ask Us - Horatio Phillips & Multiplanes<!-- Bot generated title -->]</ref><ref>http://www.flightglobal.com/pdfarchive/view/1959/1959%20-%200938.html</ref>
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