I search for the system of Parnall aircraft designation. The only I know are:
Parnall 281 "Hobo" ( a Hendy aircraft build by Parnall )
Parnall 302 ( a Hendy aircraft build by Parnall )
Parnall 311 ( a Hendy project of 1931 with the plan to build by Parnall )
Parnall 381 ( a real Parnall project from 1938 )
Parnall 382 ( the Parnall entry for Spec. T.1/37 )
I believe the numbers means that 381 is the 381.aircraft build/projected by Parnall, like Fairey. But I´m not sure, because the numbers
Parnall 3303 ( a racer project from 1933/Hendy project ) and the Parnall 3308 "Heck" are totally wrong!
PLEASE HELP, I´m totally confused.