Microlight :
Unlikely as the Globemaster 1 didn't last long in service, and they were all gone by the mid 1950s.
However I have just looked around and the C-124 Globemaster did have the same powerplants (and there were many more of them) so now I am wondering. The old Irishman was my regular taxi driver in Dublin many years ago, and also an aircraft buff (hence my confidence in his description) but could have just mixed the two types up. Unfortunately I hear he has now moved on to where nobody will be able to ask him .....