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).
Laboratory report comparing the properties of various metal alloys, likely for piston manufacturing, with a final recommendation.
| Identifier | ExFiles\Box 76\3\ scan0014 | |
| Date | 28th July 1917 guessed | |
| ROLLS-ROYCE, LIMITED. LABORATORY REPORT. RR. 884b. L 377 To: [blank] Date: 191.. Re: [blank] laboratory on: [blank] received by: [blank] [Table of Data] Columns: Composition, Relative Conductivity, Approximate Calculated piston temperature under average engine conditions (with a note 'at calculated piston temp.'), Average tensile strength, Average elong. - Aluminium etc: - Relative Conductivity: 100 - Approx. Calc. Temp: 191°C - Avg. Tensile Strength: 4.60 tons - Avg. Elong: 6.5% - Crankcase Metal: - Relative Conductivity: 78 - Approx. Calc. Temp: 245°C - Avg. Tensile Strength: 5.10 tons - Avg. Elong: 4.6% - Piston 12% Copper: - Relative Conductivity: 58 - Approx. Calc. Temp: 330°C (in test) - Avg. Tensile Strength: 6.25 tons - Avg. Elong: 1.0% - Ditto + 1% Antimony: - Relative Conductivity: 75 - Approx. Calc. Temp: 260°C - Avg. Tensile Strength: 6.80 tons - Avg. Elong: 1.6% - Copper 6% Antimony 0.8%: - Relative Conductivity: 93 - Approx. Calc. Temp: 208°C - Avg. Tensile Strength: 6.90 tons - Avg. Elong: 3.2% - Copper 8% - : - Relative Conductivity: 73 - Approx. Calc. Temp: 270°C - Avg. Tensile Strength: 6.40 tons - Avg. Elong: 2.9% - Y Metal also: - Relative Conductivity: 96 - Approx. Calc. Temp: 202°C - Avg. Tensile Strength: 7.80 tons - Avg. Elong: 5.5% - Composition Note: (Nickel 1.0%, Copper 3.0%, antimony 1.0%, Zinc 1.2%) Y metal also comes out very well but it appears that some difficulty might be experienced in casting on a large scale owing to its complexity & liability to give trouble in cooling. Under these circumstances I suggest that [word 'the' crossed out] a 6 to 8% copper alloy be used with 1% antimony added to increase conductivity & reduce porosity - Signature: HCSS | ||