651. A Simplified Method for Calculating the Weight of Aircraft Transmission Drive Shafting
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Paper
Abstract
This method for predicting the weight of aircrafttransmission driveshafting consist sof two basic equations: one for determining the number of pieces or sections ofshafts required, and the other for calculating the weight of the total shaft run. Supercritical shafting weight prediction is discussed, and a tentative solution is given. The basic aim of this method is to create a tool which is useful in the early stages of aircraft design.
The effects upon weight of various types of couplings is treated by the use of a simple type constant, which also includes the weight effect of the type of tube-to-coupling attachment. A plot of calculated versus actual weight of driveshafting is included to show the general correlation of the method.
Only four facts (all usually available at the earliest design stage) need be known:
1. Operation at subcritical or supercritical speed
2. Length of the shaft run
3. Operating rpm
4. Maximum power
This method has been used satisfactorily for more than 4 years.
