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).
Letter from Dunlop regarding the dynamic balance of wheels and tyres.
| Identifier | ExFiles\Box 4\3\ 03-page35 | |
| Date | 3rd September 1925 | |
| Telegraphic Address: "DUNLOP'S, BIRMINGHAM" Telephone No. BIRMINGHAM CENTRAL 4108 PRIVATE BRANCH EXCHANGE (17 LINES) X401 BY APPOINTMENT Registered Offices, DUNLOP HOUSE, 1, ALBANY ST.{Capt. P. R. Strong} LONDON, N.W.1. DUNLOP RUBBER CO LTD Founders of the Pneumatic Tyre Industry FORT DUNLOP, ERDINGTON, BIRMINGHAM. STATION: CASTLE BROMWICH (MID RLY.) GOODS: TO DUNLOP SIDINGS, CASTLE BROMWICH. CAR ROUTE: TYBURN ROAD from STEELHOUSE LANE to FORT DUNLOP WORKS. CAR 83. WHEN REPLYING PLEASE QUOTE ON BOTH LETTER & ENVELOPE Research Department ALL COMMUNICATIONS TO BE ADDRESSED TO THE FIRM Messrs. Rolls Royce Ltd. Nightingale Road, DERBY. 3 Sept. 1925. Your ref: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG. Dear Sirs, For the Attention of Mr. W.A. Robotham. In reply to your letter of the 2nd. inst., we have no facilities for making tests of the dynamic balance of wheels and tyres. We have had occasion to run a wheel and tyre at 2700 R.P.M., at which speed there was no indication of vibration. Both the wheel and tyre were chosen at random from stock, and were statically balanced to within ½ oz. at the radius of the rim. (It may be pointed out that at 2700 R.P.M. the centrifugal forces are 20 times as great as at 600 R.P.M.). We are of the opinion that the lack of dynamic balance must be very small because of the symmetrical construction of the wheel, and because the wheel is large in diameter compared with its width. (See Goodman's "Mechanics Applied to Engineering," page 213). Yours faithfully, A Healey for DUNLOP RUBBER CO. LTD. | ||