The second boys' book of model aeroplanes by Collins Francis A. (Francis Arnold) 1873-

Author:Collins, Francis A. (Francis Arnold), 1873-
Language: eng
Format: epub
Tags: Airplanes
Publisher: New York, The Century co.
Published: 1911-03-25T05:00:00+00:00

The pull of the motors when wound is thus well distributed and, as has been pointed out, permits of a larger propeller being used without danger of their striking in turning. Still another advantage is that it keeps the strands of the motor from interfering with the planes. When the motors are strung above the planes, they have a tendency to force the machine ( downward.

Construct two serviceable planes the same size, six by eighteen inches. These should be flat and covered as smoothly as possible. Now attach to the rear edges

14S

E rear edges I

MODEL AEROPLANE DESIGNS

of each plane a series of three airelons each two by five inches, fastening one at either end and the third at the middle. Make the frames of the airelons of a very light lath strip and wire them to the rear edge in such a way that they may be swung up or down through a small arc. At the outer ends of each of the planes, attach semicircular tips, each with a base of six inches and a radius of six inches. These may be rounded off or cut away to sharp points as desired. They should also be attached so that they may be bent up or down and will hold their position. Mount the model on some simple arrangement of reed skids, so that it will be elevated at a very slight angle above the horizontal. The model complete should weigh about eight ounces. Equipped with twin motors of fourteen strands of one-sixteenth-inch rubber each, the propellers should be turned about four hundred times. A medium-pitch propeller will best serve your purpose.

In flying this model, bear in mind that the flight will be directed iii an opposite direction from the angle of the airelons, or rudders, just as a boat answers its helm. The wing tips should be bent up or down until the flight is stable. The complete equipment of airelons enable one to correct any defects in proportion which are likely to be needed in models built by beginners.

MODEL AEROPLANES

AN EFFICIENT THKEE-OUNCE MODEL.

(Record 900 Feet)

A surprising variety of designs may be carried out | ill models of the three-ounce class- One of the easiest to control is a broad adaptation of the Bleriot ' model, flown with its small surface forward. For a j three-foot model, first build two planes of very light material. Wire frames are especially suited for this model. The main plane should measure two feet in length by four in width, or with an aspect ratio of six. The smaller plane, carried forward, should be one foot in length with the same aspect ratio. It will be found a good plan to carry the outer edges , of this plane back, forming two inch squares at the rear edges. A plane with a slight camber will prove | the more stable.

For the frame secure two light sticks three-six- I teenths of an inch square of some fairly strong wood; a straight spruce is good. Attach the motors to these sticks before completing the frame.

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