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).
Blueprint showing the design and dimensions for a 6.50/16 Avon L.P. Passenger Tyre, Type R.B.
| Identifier | ExFiles\Box 156\3\ scan0221 | |
| Date | 20th May 1939 | |
| BEAD VENTS (SEE NOTE ON PLAN) PARTING LINE OF MOULD. 2.68 ARC 2.55 CHORD RADIAL VENTS PARALLEL 15° NOTE: WITH THE EXCEPTION OF SECTION ON H.H ALL VIEWS ON THIS DRAWING ARE OF THE TYRE NOT THE MOULD. 30.057 O/DIAM. 7.06 3.335 15.837 FITTING DIAM. SECTION A-A.{Mr Adams} SECTION ON K.K FULL RADIUS ENLARGED VIEW OF CURBING RIB. (4 TIMES FULL SIZE) 6.50/16 AVON L.P. PASSENGER TYRE - TYPE R.B. MOD 4.6.39 B.W. CLARIFICATION OF REINFORCING IN GROOVES C NOTE - CENTRE TRACTION PATTERN .375" ON ℄ LINE. DEPTHS .375" & .335" DEEP. AT .925 EACH SIDE SAME ℄ LINE. MOD 10.6.39 BY R.W. O.T. DEPTHS REDUCED .378 WAS .425. .335 WAS .365 & AIO D & S SPOTS. GROOVE C DIMENSION .223 WAS .240 RADIAL VENTS ~ ONE RADIAL VENT 5/64 WIDE x 1/2 DEEP CUT IN MOULD JOINT FACE FROM EACH MAIN TREAD STUD AS SHOWN. LONGITUDINAL SECTION THRO' GROOVES. D=DEEP, S=SHALLOW. 14 PITCHES OF 6.56 ON ℄ LINE GROOVE D 14 PITCHES OF 6.66 ON ℄ LINE GROOVE B SECTION ON G-G 28 PITCHES OF 3.373" PER CIRCUMFERENCE TAKEN ON ℄ LINE OF TYRE. BEAD VENTS. DRILL 5/64 DIAM. VENTS THRO' NON-SKID RIBS AS NEAR TREAD SURFACE AS POSSIBLE. 3.373 PITCH ON ℄ LINE. ENLARGED VIEW OF JUNCTION POINTS SCALE TWICE FULL SIZE SECTION ON Y-Y SECTION ON X-X REINFORCING TO COMMENCE 1/2" FROM 180 RAD, RISE EX. FROM TOP OF TREAD TO 1/2" BY A FALL AWAY AS DRAWN. RADIUS OF .638" AS DRAWN. SECTION THRO' H-H SPECIAL NOTE THIS IS A VIEW THRO MOULD NOT TYRE RADIUS RISE & FALL ONLY WHEN TIPS ARE ADJACENT AS AT L.H. SIDE OF TRIANGULAR TREAD BLOCKS. SECTION THRO' Z-Z FULL RADIUS SECTION U-U SEC. V-V (TWICE FULL SIZE) SEC. W-W SECTION THRO' J-J BRANCHING TO BLEND INTO REINFORCING WHEREVER POSSIBLE. SCALE - FULL SIZE UNLESS OTHERWISE STATED DRG. No R.T. 8775.D REVISIONS: A | 27.5.39 | B.W. | DRAWN | 20.5.39 | R.W. B | MOD 3.6.39 | R.W. | TED. | R.W. C | .051 RAD. B'T'N GROOVE C & E WAS .020 | CK{Mr Clark}'D.{John DeLooze - Company Secretary} | Tmd. | ||