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).
Calculations for Spectre Matrix heat dissipation and critical air temperature based on test bed figures.
Identifier | ExFiles\Box 149a\2\ scan0261 | |
Date | 6th November 1935 | |
(Appendix - Sheet 1) HS{Lord Ernest Hives - Chair}/Std.14/KW.6.11.35. Calculations for SpectreCodename for Phantom III Matrix. From test bed figures, heat to be dissipated at 85 m.p.h. full throttle = 8100 B.T.U's/min. From test figures, at 85 m.p.h., dissipation of Mark V 84 m.m. matrix block (taking untinned block figures as most reliable)= 66.5 B.T.U's/min/°C. diff. temp. between air and water inlet temps. for a 2 sq.' block. If H = heat dissipated/min. & Δt = °C. temp. difference between inlet air and water A = frontal area of SpectreCodename for Phantom III matrix in sq.'. ∴ H/Δt = 66.5A/2 H = 8100 A = 601/144 ∴ Δt = (2 x 8100 x 144) / (66.5 x 601) = 58.5°C. ∴ In limiting case where water inlet = 100°C. air inlet = critical air temp. = 100 - 58.5 = 41.5°C. (Note: Critical air temp. = "air temp. to boil"). | ||