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Tandem wing
Tandem wing is a name given to any configuration where both the stabilising and lifting surfaces contribute significantly to the overall lift, and this term thus includes the canard arrangement. A number of experimental aircraft have been flown with two surfaces of almost equal area, but their handling and stability characteristics often gave problems, as in the case of the popular pre-war Flying Flea. In particular, such designs seemed to be prone to a pitching oscillation; as though neither wing could quite make up its mind which was supposed to be dominant. However the popular and successful homebuild Quickie shown in Fig. 11.9 has proved that the tandem configuration can work. Further information on tandem and canard aircraft can be found in Bottomley (1977).
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Fig. 11.9 Tandem wing The Quickie Q2 has two sets of wings of equal span. Burt Rutan was associated with this clever design, which uses composite materials, and is intended for the home builder. The use of the front wing to double as undercarriage legs, though ingenious, has disadvantages in terms of ground handling qualities, and shock loading to the wing structure on landing. A version with a conventional tricycle undercarriage is available |
