A 1929 Trimotor designed by Carroll was noted as being test flown by Williams on 5 October 1929. It was to be powered by three 60 hp Velie and used as a photographic survey plane.
On 6 October 1929 the plane was flown to San Antonio for use by West Texas oilman Joe Palmer of the Texas Pacific Coal and Oil Company of Fort Worth.
All Aero 