Kenneth W. Barkman (left) and N.E. Cherdavoine of Los Angeles are shown with their new airplane motor, a semi-turbine rotary, with no reciprocating parts. It is pistonless, valveless, sleeveless, camless, has no springs, will develop 450 horsepower. has but 15 parts and consists of two housings. It weighs 220 pounds and is approximately 18 by 18 by 12 inches.

Digital Commonwealth — Boston Public Library

Kenneth W. Barkman (left) and N.E. Cherdavoine of Los Angeles are shown with their new airplane motor, a semi-turbine rotary, with no reciprocating parts. It is pistonless, valveless, sleeveless, camless, has no springs, will develop 450 horsepower. has but 15 parts and consists of two housings. It weighs 220 pounds and is approximately 18 by 18 by 12 inches.

Wide World Photos, Inc. · [ca. May 1928]

RightsCC0 — Public Domain

CollectionDigital Commonwealth — Boston Public Library

[Information from item housing] Inventions

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