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PrintCollection Name: Drachen Foundation Collection
Collection Number: 2497
Post Type: Book
This item was entered by Matthew Sutton. They assume full responsibility for all content.
Artist or Author: R.J. Hoffman
Creation Year: 1955
Length: 0.00
Height: 0.00
Width: 0.00
Summay:
Language: English Description: The purpose of this booklet is to appeal to a wider circle of readers to use the contents and take further steps in advancing model aeronautics to a higher level. The collection of references and investigations is the result of fifty years of experience in engineering, which includes designing of airplanes from 20 to 1200 h.p. since 1909 and scientific testing of models since 1912.
The mathematical aspect of model engineering is not very promising because of the great variations in basic designs. In spite of the lack of systematic tests with models an attempt has been made to use aerodynamics for large airplanes and low-velocity wind-tunnel reports in predicting the performances and the stability of models, many of them contradictory.
The relatively large forces of torque, power, gyrosopic moments of high speed propellers not present in large airplanes makes model aeronautics a new field of engineering. Attention is called to the problem of weight distribution, to the relative position of the zero-lift lines of airfoils and the distance of the thrustline to the center of gravity.
Thanks to all model builders who supplied flying characteristics of their models, that were incentive of many theoretical investigations appearing in this booklet.
If following, poorly arranged pages contribute only in a small share to greater interest in model aeronautics the labor involved was well rewarded.
104 pages
Geographic: United States
Materials: Paper
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