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).
Wind tunnel test results for a scale model Bentley Saloon, comparing various front wing designs and other configurations.
| Identifier | ExFiles\Box 160\2\ scan0132 | |
| Date | 27th June 1933 | |
| TEST N.o | SCREEN | SPARE WHEEL | REAR WINGS | TAIL | RUNNING BOARD | FRONT WINGS | TUNNEL DRAG AT 70 FT. SEC. | TUNNEL DRAG AT 70 FT. SEC. CORRECTED FOR WIRES | DRAG AT 90 M.P.H. | MAX. LAP SPEED 91 H.P. AT ROAD WHEEL 1 | 17° Rec | NIL | SHORT | NIL | NIL | NIL | 1.1482 | 1.0929 | 302 | 94.5 2 | 17° Rec | STD. | SHORT | NIL | NIL | NIL | 1.1424 | 1.0871 | 300 | 94.75 3 | 17° Rec | STD. | SHORT | YES | STD. WITH NO OUTSIDE VAL. | 1.2995 | 1.2442 | 343 | 88.75 *4 | 17° Rec | STD. | SHORT | YES | STD. WITH OUTSIDE VAL. | 1.2908 | 1.2355 | 341 | 89.0 | 1.B.3 BROOKLANDS 5 | 17° OUT | STD. | SHORT | YES | STD. WITH NO OUTSIDE VAL. | 1.3067 | 1.2514 | 346 | 88.2 6 | 17° REC | STD | SHORT | YES | FLARED WITHOUT MUDLIP | 1.2807 | 1.2254 | 338 | 89.2 7 | 17° REC | STD | SHORT | YES | FLARED WITH MUDLIP | 1.3078 | 1.2525 | 347 | 88.2 8 | 17° REC | STD | SHORT | NO | BIRDWING (10 Ex. TYPE) | 1.3608 | 1.3055 | 360 | 86.75 9 | 17° REC | STD | SHORT | YES | PANHARD TYPE. | 1.2765 | 1.2212 | 337 | 89.1 10 | 17° REC | STD | SHORT | CYCLE TYPE 11 | 17° REC | STD | SHORT | SLIPPER TYPE 12 | 25° Rec | STD. | SHORT | YES | STD (NO OUTSIDE VAL.) | 1.3021 | 1.2468 | 344 | 88.7 13 | 35° Rec | STD. | SHORT | YES | STD (NO OUTSIDE VAL.) | 1.2930 | 1.2377 | 341 | 89.0 13A | 45° Rec | STD. | SHORT | YES | STD (NO OUTSIDE VAL.) | 1.2969 | 1.2416 | 342 | 89.0 16A | 17° Rec | STD | LONG | YES | STD (NO OUTSIDE VAL.) | 1.3153 | 1.2600 | 348 | 88.2 16B | 25° Rec | STD | LONG | YES | STD (NO OUTSIDE VAL.) | 1.3118 | 1.2565 | 346 | 88.1 16C | 35° Rec | STD | LONG | YES | STD (NO OUTSIDE VAL.) | 1.3131 | 1.2578 | 346 | 88.1 16D | 45° Rec | STD | LONG | YES | STD (NO OUTSIDE VAL.) | 1.2999 | 1.2446 | 343 | 88.75 17 | 35° REC | STD | SHORT | YES | PANHARD TYPE | 1.2696 | 1.2143 | 335 | 89.2 B 19 | 45° REC | STD | LONG | NO | NIL | .9555 | .8982 | 247 | 104.5 ϕ 20 | 35° REC | STD | LONG | YES | PANHARD - SEE NOTE ϕ | 1.1581 | 1.1028 | 304 | 94.5 ϕ 21 | 17° REC | STD | SHORT | YES | PANHARD - SEE NOTE ϕ | 1.2475 | 1.1922 | 329 | 90.75 * THE LAP SPEEDS ARE DERIVED FROM THE RELATIVE WIND TUNNEL DRAGS, AND ARE BASED ON THE FACT THAT THE BLACK SALOON 1. B. 3. LAPPED BROOKLANDS AT 89 M.P.H. WITH 91 H.P. AT THE ROAD WHEEL. ϕ PANHARD WINGS, WITH RADIATOR RIGHT FORWARD & GAPS BETWEEN BONNET & WINGS FILLED IN. SEE PHOTOGRAPH. B. MODEL REVERSE IN WIND STREAM. WIND TUNNEL TESTS. MODEL 1. BENTLEY SALOON. N'SCH. 3738. SCALE 1/8. AIR SPEED OF TESTS 70 FT.-SEC. ROLLS ROYCE, LTD. PRINT ROOM JUN 27 1933 DERBY. | ||