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).
Analysis of various aircraft, including the Spad 21 and Amiot 140M, with a detailed focus on Lamblin radiators.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan033 | |
| Date | 20th December 1930 | |
| -3- Hs{Lord Ernest Hives - Chair}/ACL.1/MJ.20.12.30.Contd. similar to the Dewoitine are employed and two fixed Lamblin radiators are provided under the short lower wing. These radiators are not provided with shutters but employ a by-pass scheme which one would imagine to be very liable to freeze when gliding down from high altitudes. No arrangements for oil cooling were visible. The general finish was superior to any machine I have seen. Appended are given their published performance figures and print of machine. Print (4). The Spad 21. This was fitted with a Hispano 500 HP. engine similar to the Dewoitine but had an oval honeycomb radiator round the propeller hub similar to the old Bristol fighter. It was a neat machine but the bad nose would appear to account for its lower performance than the Dewoitine. Its top speed is stated to be 169 M.P.H. at 12,500 ft. compared with 173 M.P.H. of the Dewoitine for the same engine. Amiot 140M. This was a large twin engine high wing monoplane provided for the purpose of fighting and day and night bombing and reconnaissance. It was fitted with two 700 HP. Lorraine "Orion" engine which were particularly neatly faired into the wing. It has a speed of 181 M.P.H. at sea level. All metal construction. The engine mounting and streamlining was particularly well carried out. Many of the other machines were particularly interesting but serves little purpose to discuss them here. INSTALLATION DETAILS AND ACCESSORIES. Lamblin radiators. These radiators are built up of a series of flat semi-circular plates with as far as one could estimate, .075 water gap between them. The air space between the plates would be about 3/16" and they presented the appearance of a 'variable condenser'. The water is lead in | ||