The aircraft spin - a mathematical approach and comparison to flight test

摘要

A Scottish Aviation Bulldog light aircraft operated by the National Flying LaboratoryCentre (NFLC) at Cran eld University, modi ed with research equipment including breoptic sensors for wing strain and fuselage pressure measurements, is used to investigatethe dynamics of a fully developed spin. A theoretical model is developed to compare withexisting ight test data. In particular, the frequency of the aircraft spin is analysed as afunction of the mass distribution of the aircraft to determine the e ect of the fuel load.It is found that the spin frequency is minimally a ected by the fuel load since themoments of inertia corresponding to the engine, for example, are far more signi cant.However, it is con rmed that the yawing e ect of the propeller causes the aircraft to spinfaster to the right than to the left.