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 graph with calculations detailing silencer response and chamber frequency.
| Identifier | ExFiles\Box 104\2\ scan0040 | |
| Date | 1st January 1932 guessed | |
| Sheet 2. LARGE CHAMBER FREQUENCY 80 SMALL CHAMBER FREQUENCY 100 C1/C2 = 2/1 y = N / (1 - N² / n₁²) WHERE n = 80 N=200 y=-30 N=160 y=-55 N=140 y=-70 N=120 y=-95 N=90 y=-300 N=70 y=+300 N=60 y=+140 N=50 y=+80 N=44 y=+50 N=30 y=+35 N=100 y=-175 Graph Data: Curves: N1=80, N1=100, N1=120, N2=100, N2=130 Note: N1=120 (10" CHAMBER VOL. 220 CU INS C=35) Axes: Y-axis (y/100), X-axis (N) Diagrams on graph: N₂ = 130 C1 / C2 = 4 C' / C2 = 1 y = -C1/C2 * N(1 - n₂²/N²) WHERE N₂ = 100 N=70 y=71 N=60 y=106 N=50 y=50 N=40 y=210 N=110 y=-18 N=120 y=-35 N=130 y=-50 N=140 y=-66 N=160 y=-98 N=180 y=-122 N=200 y=-150 N=80 y=+44 SILENCER TO RESPOND TO A FUNDAMENTAL NOTE OF 54/SEC ON J.III UPPER RESPONSE FREQ'Y 140/SEC | ||