TABLE OF CONTENTS Having now obtained final values for the horizontal pressure, or the resistance to the horizontal advance of inclined planes, and having determined their soaring speeds at different angles of inclination, the work necessary to be expended per minute in propelling such planes through the air is given in kilogrammeters by the expression 60 RV, R being the horizontal pressure in grammes, and V the soaring speed expressed in meters per second.
The following table, XIII, contains a computation, for the case of the 30x4.8 inch plane weighing 500 grammes, of the work necessary to be expended per minute, the values of R being taken from the curve of figure 11:
| Angle with horizon ?. | Soaring speed V. | Horizontal pressure R. (Observed.) | Work expended per minute 60 RV. | Weight with planes of like form that 1 horse-power will drive through the air at velocity V. | [Note to second edition.] R=W tan ? R. (Calculated.) | |||
|---|---|---|---|---|---|---|---|---|
| Meters per second. | Feet per second. | Grammes. | Kilogrammeters. | Footpounds. | Kilogrammes. | Pounds. | Grammes. | |
| 45 | 11.2 | 36.7 | 500 | 336 | 2,434 | 6.8 | 15 | 500. |
| 30 | 10.6 | 34.8 | 275 | 175 | 1,268 | 13.0 | 29 | 288. |
| 15 | 11.2 | 36.7 | 128 | 86 | 623 | 26.5 | 58 | 134. |
| 10 | 12.4 | 40.7 | 88 | 65 | 474 | 34.8 | 77 | 88.15 |
| 5 | 15.2 | 49.8 | 45 | 41 | 297 | 55.5 | 122 | 43.75 |
| 2 | 20.0 | 65.6 | 20 | 24 | 174 | 95.0 | 209 | 17.5 |
This table shows that for an inclination of 2 the velocity of flight which suffices for...
