A New Aero‐Engine Dynamometer: The New Froude P. Type for Testing Right or Left Hand Engines up to 4,500 h.p.

THE development of high‐powered aero‐engines has created a demand for dynamometers capable of dealing with powers and speeds considerably greater than were formerly possible. Whereas, a few years ago, aero‐engines of 1,000 h.p. were rarely produced, ratings of special engines have steadily crept up beyond 2,000, and will soon exceed 3,000 b.h.p. Speeds have also tended to increase considerably; and the results have been that the working stresses from torque, centrifugal forces, water velocities, etc., in the water dynamometers of existing design used for testing such engines, have approached the limit attainable with safety and reliability.