From 'Cierva Autogiros the development of rotary wing flight',
Peter W.Brooks, Airlife, 1988, page 226,
"Pitcairn PA-38.
Designation of a series of design studies undertaken
for a USAAC design competition (Spec XC-417, circular
proposal 40-260), which closed on April 22, 1940.
These were of a large jump take-off autogiro of 4,200lbs
loaded weight, suitable for military observation or cargo;
mail carriage; insecticide-dispensing of forest fire-fighting.
Kellett submitted studies of two direct-control designs
without jump take-off capability.
None of the studies was proceeded with.
The Army contract went to Platt-LePage for their XR-1
helicopter."
cheers,
Robin.