CHAPTER XII.

EXPERIMENTAL RECORDS.

A model flying machine being a scientific invention and not a toy, every devotee to the science should make it his or her business to keep, as far as they are able, accurate and scientific records. For by such means as this, and the making known of the same, can a _science_ of model aeroplaning be finally evolved. The following experimental entry forms, left purposely blank to be filled in by the reader, are intended as suggestions only, and can, of course, be varied at the reader's discretion. When you _have_ obtained carefully established data, do not keep them to yourself, send them along to one of the aeronautical journals. Do not think them valueless; if carefully arranged they cannot be that, and may be very valuable.

EXPERIMENTAL DATA.

FORM I.

Column Headings:

A: Model B: Weight C: Area of Supporting Surface D: Aspect Ratio E: Average Length of Flight in Feet F: Maximum Flight G: Time of Flight, A. average H: M. maximum I: Kind and Direction of Wind J: Camber K: Angle of Inclination of Main Aerofoil to Line of Flight

-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- A | B | C | D | E | F | G | H | I | J | K -----+-----+-----+-----+-----+-----+-----+-----+-----+-----+----- | | | | | | A | M | | | 1 | | | | | | | | | | 2 | | | | | | | | | | 3 | | | | | | | | | | 4 | | | | | | | | | | 5 | | | | | | | | | | 6 | | | | | | | | | | 7 | | | | | | | | | | 8 | | | | | | | | | | 9 | | | | | | | | | | 10 | | | | | | | | | | 11 | | | | | | | | | | 12 | | | | | | | | | | | | | | | | | | | | -----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----

FORM I.--_continued_.

Column Headings:

A: Model B: Weight of (Rubber) Motor C: Kind of Rubber, Flat, Square or Round D: Lenght in Inches and Number of Strands E: Number of Turns F: Condition at End of Flight G: Number of Propellers (No.) and Diameter (Diam.) H: Number of Blades I: Disc Area (DiscA.) and Pitch (Pitch) J: Percentage of Slip K: Thrust L: Torque in Inche-Ounces

----+----+----+-----+----+----+-----+----+-----+----+----+----+ A | B | C | D | E | F | G | H | I | J | K | L | ----+----+----+-----+----+----+-----+----+-----+----+----+----+ | | | | | | | | | | | | | | | 1 | | | | | | | | | | | | | | | 2 | | | | | | | | | | | | | | | 3 | | | | | | | | | | | | | | | 4 | | | | | | | | | | | | | | | 5 | | | | | | | | | | | | | | | 6 | | | | | | | | | | | | | | | 7 | | | | | | | | | | | | | | | 8 | | | | | | | | | | | | | | | 9 | | | | | | | | | | | | | | | 10 | | | | | | | | | | | | | | | 11 | | | | | | | | | | | | | | | 12 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ----+----+----+-----+----+----+-----+----+-----+----+----+----+