Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently

The entrance 6 of a passage leading cooling air to the cylinders of an aircraft engine comprises an adjustable flap valve 10, which opens outwardly and is inwardly streamlined. The engine is surrounded by a streamlined cowling 4 and the entrance 6 is slightly offset to the bank of cylinders 3, the exit being on the opposite side of the cowling. In a radial‐cylinder engine a separate air passage is provided for each bank of cylinders.