A new use has been found for the trimotor Junkers Ju-52 in Germany, where the plane is now being used for testing new engines. The aircraft engine which is to be tested is mounted as the center powerplant, so that the test pilot can switch off the experimental motor if necessary. The cabins of these Ju-52s have been converted into "flying test stands" and are equipped with all the necessary gauges and instruments. The test flights are usually carried out at predetermined heights, and as the plane may have to fly through cloud banks, a full complement of radio and blind flying equipment is carried.
This article was originally published as part of the "Aviation Abroad" column in the November, 1942, issue of Aviation magazine, vol 41, no 11, p 262.