An Investigation into the Effects of Running Propellers on the Static Longitudinal Stability of Multi-Engine Tractor-Propeller-Driven Monoplanes

Citation

Amster, Warren (1948) An Investigation into the Effects of Running Propellers on the Static Longitudinal Stability of Multi-Engine Tractor-Propeller-Driven Monoplanes. Engineer's thesis, California Institute of Technology. doi:10.7907/VMA6-2G04. https://resolver.caltech.edu/CaltechETD:etd-12082008-141518

Abstract

This thesis has three main purposes: 1. To establish an engineering computation procedure for predicting C[subscript M]( c. g.) as a function of C[subscript L] and power conditions for a multi-engine monoplane of conventional configuration with tractor propellers mounted on and forward of the wing from a given curve of C[subscript M] as a function of C[subscript L] for the power-off condition. 2. To recommend aircraft configurations which will minimize destabilizing effect of power. 3. To provide a physical explanation of the effect of power on stability. Calculated C[subscript M] vs. C[subscript L] curves are compared with "matched-power" wind tunnel model test results. The agreement is good for all-right-hand rotation of propellers but unsatisfactory for other rotation modes.

Thesis Files