(a) Reasons for enquiry (l) The Momentum Theory of R. E. Fronde leads to equations which require some modification when the airscrew is working in a tunnel of dimensions comparable with the diameter of the screw. (2) Some ...

The method of investigating the twist of propeller blades, which was developed in R. & M. 454, is interpreted mathematically by making a certain assumption as to the shape of the cross-sections. A general equation expressing ...

The investigation was undertaken in response to a request from the Technical Department of the Air Board for information as to the most sensitive form of yawmeter, and for a calibration curve for such an instrument. The ...