Test report detailing observations on car vibrations, rattles, and performance under various configurations.
| Identifier | ExFiles\Box 5a\1\ 01-page113 | |
| Date | 20th April 1933 guessed | |
| - 2 - 3rd. Test. Test as above with the steering column insulated with strips of rubber in support clip and bracket on dash removed and gap filled with rubber. We could not appreciate any difference this made to the booming on this car. The retard vibration and rattle became more evident to me as side shaft gear rattles when mounting the car about. I noticed the revenue gears are poor also a hard tight place in them. 4th. Test. Test with standard exhaust downtake instead of the bottle type expansion box fitted. We could not detect any difference this made on the boom, but it is much more silent and not so noisy when cold. On changing over we found that the joint where the pipe is welded to the bottle was broken for a distance of 2" on the inside top side of joint. 5th. Test. With all damping removed from slipper drive by removing the presser plate complete and the cotton duck ring. (and fitting in a ring to take up the gap left by presser plate, this to enable us to leave the loading untouched, so as to put it back as we found it.) We could appreciate any difference in the boom. The max. boom is at 30 - 48 m.p.h. on top gear on retard. But the torsional periods are now outstanding, crisp, and violent. Ontop gear at 27 mph. and 42 mph. The one at 42 rattles the gear lever, we also get one at 37 m.p.h. which is quite distinct. On 3rt. gear we get one at 37 m.p.n. and one at 40 m.p.h. The overrun vibration at 40 on top remains the same. 6th. Test. With the balance weights removed from crankshaft. The half torsional period on top gear is now at 50 - 51 m.p.h. there is a little more of it, but it is not so crisp. It is spread over a longer period, and the one at 34 m.p.h. is not so crisp, but of about the same magnitude as on the previous test, it is also spread over a | ||
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).