TY - JOUR AB - THE increase of the specific power of aero‐engines in the last few years has been obtained in three ways, namely: by increasing the engine speed and, more particularly, by raising the compression ratio and by adopting supercharging. VL - 11 IS - 6 SN - 0002-2667 DO - 10.1108/eb030501 UR - https://doi.org/10.1108/eb030501 AU - Balleret A. PY - 1939 Y1 - 1939/01/01 TI - The Manufacture of Hollow Valves T2 - Aircraft Engineering and Aerospace Technology PB - MCB UP Ltd SP - 240 EP - 242 Y2 - 2024/04/23 ER -