Henri Vaslin of France developed light aircraft engines in the early 1920s. His two HOAE are described here.
O-69 -- {2.559 / 3.346 / 68.8} / {65 / 85 / 1128}
Same stroke as O-80.
4cyl; N/A; 15hp@1600rpm, 20@2400 (TO); 1922; Wt = 90#.
Dual-ignition engine.
Ae39.
Applications: None found.
O-80 -- {2.756 / 3.346 / 79.8} / {70 / 85 / 1308}
Same stroke as O-69.
4cyl; N/A; 24hp@2500rpm, 28@3000 (TO); 1923; Wt = N/A.
Dual-ignition engine.
Ae39.
Applications: (Belgium) Mulot Labor [O-BAFS].