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 cooling performance, heat dissipation and critical air temperature.
| Identifier | ExFiles\Box 87\1\ scan0173 | |
| Date | 6th November 1935 | |
| (Appendix - Sheet 3) HS{Lord Ernest Hives - Chair}/Std.14/KW.6.11.35. Since pressure difference ∝ v^1.8 and cooling ∝ v^.8 (both very nearly) if H₂ = cooling under car conditions and H₁ = cooling under rig conditions, H₂ = H₁ x { (2.580 / 2.990) ^ (1/1.8) } ^ .8 = .936 H₁ Actual dissipation figure for car using 84.m.m. Mark V matrix = 66.5 x .936 = 62.2 B.T.U's/min/°C. temp. diff. between inlet water and inlet air. As before H / Δt = (602 x 62.2) / (144 x 2) = 130.0 Δt = 5100 / 124.3 = 62.3 °C. Critical air temperature = 100 - Δ = 37.7°C. NOTE: Boiling has occurred under full throttle conditions in France with an air temperature of approx. 30 - 32°C. | ||