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Aviation History
1910
1910 - 0425.PDF
JUNE 4, 191a. [/yGHT] SCIENTIFIC MODEL CONSTRUCTION. By G. TILGHMAM RICHARDS. THE following abstract of a paper read before the Manchester Aero Club should be of considerable interest to those of our readers who are engaged in the construction of models. It represents an attempt to deal with model-making on scientific constructional lines, and although the author has confined his practical experiments to the testing of lattice girder frames, the frame members are, as he points out, usually the heaviest parts of the machine, and therefore those that are most likely to introduce a factor of overloading. I wish to touch very briefly on the general aspects of model con struction under the following headings :—I, Making models, work manship, the uses of models ; 2, weight of models ; 3, flying models by hand, and the uses of a mechanical starting device ; 4, the slow speed of models, and the resultant departures from full- sized practice necessitated thereby ; 5, the lateral turning point in relation to the centre of gravity, and the application of the pendulum system with the dihedral angle ; 6, models as natural gliders after exhaustion of propelling mechanism ; 7, methods of control; 8, the testing of model sections to destruction. TEST. 5 PRINCIPALS. y^ U^—^ l5/,« -•- .'CENTRES. Ve' SQUARE. ^^-, ^^. TEST. 9 PRINCIPALS. 1%. CENTRES. ^SQUARE TEST,10. PRINCIPALS, ZV CENTRES. GROUND. TEST. 11 PRINCIPALS, \X. CENTRES. % SQUARE TEST. 14. PRINCIPALS, 3'CENTRES % ROUND. TEST,15. PRINCIPALS, 2%*"CENTRES. 'A'SQUARE. Sections tested. 423
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