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Aviation History
1920
1920 - 0676.PDF
JUNE 24, 1920 NOTE.—if// communications should be addressed to the Model Editor A Compressed-Air Driven Model ; I SHOW this week a plan view of the compressed-air drivenmodel which was the subject of my last article. The total weight of the machine is just over 2 lbs., but, even so, thepower is ample to raise the machine from the ground. The model gets off after a run of 6 feet, and climbs to a heightof about 30 feet. It is also quite stable, and there has been no trouble in this respect. I found that duration of flightwas roughly half the number of pump strokes up to a point (100 strokes), after which no particular ratio exists. Icertainly think the plant is capable of giving a duration of well over 60 sees, to a machine. The Tail and Rudder.—The tail is carried on two outriggers secured by duralumin straps to the container. I think the view here given will make the construction of this unitabundantly clear. Simple featherweight construction has been adopted to enable the centre of gravity to be kept asforward as possible. I kept the centre of thrust high, so that when the thrust decreases from the initial burst themachine would not have a tendency to dive ; this, of course, owing to the main plane being well forward to overcomethe " nose down " effect of having the thrust high. The rudder is merely a simple fabric covered framework,retained in the rertical by means of piano-wire bracing. The main planes, anent which some information was givenlast week, should be carefully made up on full-size lines. I show some methods of plane construction which could alsobe embodied. Such construction, while tedious, amply repays one. I think that, from a practical point of view, • j
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