The fourth, and next, main element in the demonstration will be provided when diesels go into regular service on some well-known transport line as standard equipment, and the accumulation of data on performance under normal service conditions begins.
"The First Airplane Diesel Engine: Packard Model DR-980 of 1928"
Robert B. Meyer
The Towle was powered by 2 Packard diesels on loan from the Packard Motor Car Company.
"The First Airplane Diesel Engine: Packard Model DR-980 of 1928"
Robert B. Meyer
An advantage peculiar to the Packard among aeronautical diesels was its light weight.
"The First Airplane Diesel Engine: Packard Model DR-980 of 1928"
Robert B. Meyer