From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Calculations for horsepower required for an air jet system.
| Identifier | ExFiles\Box 27a\3\ Scan181 | |
| Date | 31th March 1931 guessed | |
| x4516. Area of jet - 25 sq ft Velocity of air 85 M.P.H. Quantity of air/min in lbs = 25 x 85 x 88 x .08 = 18,600 lbs K.E. of air = MV^2 / 2g = (124^2 x 18600) / 64 ft.lbs. This is generated every min. ∴ Work done/min = (124^2 x 18600) / (64 x 33,000) = 133 H.P. Assuming 50% efficiency this requires a motor of 266 H.P. - Reduce free air area to 9 sq FT - Reduce vel. to 70 M.P.H Then H.P. required = 260 x (9/25) x (49/72) = 62.1 H.P. ✓ [Scratchpad] 9.00 / 80 124 x 124 ----- 124 248 496 ----- 15366 2 33000 | ||