 The second of two prototypes ordered on 1 January 1944 , it was used for structural testing before being disposed of in 1952 . 
 The second of two prototypes ordered on 1 January 1944 , it was used for structural testing before being disposed of in 1952 . 
The second of two prototypes ordered on 1 January 1944 , it was used fa structural testing b4 being disposed of in 1952 .