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I wrote "Three-blade propeller Junkers VS
5" on Google and all pages that are displayed was about Ju 87.
I found this site
http://www.xs4all.nl/~fbonne/warbirds/ww2htmls/junkju87.html
where I got the following text:
The Ju 87 V1 first flew in April
1935, and had a tail with two vertical endplates. It was powered by a Rolls
Royce Kestrel V Vee, rated at 640 hp (477 kW). The propeller was a 2-blade
wooden example with fixed-pitch. This engine overheated in it's first flight,
and the radiator was moved to the chin position and enlarged. In it's firt dive
the tail with two vertical units started to oscillate, and one endplate broke
away resulting in a crash
The Ju 87 V2 was already nearing
completion at the time of the crash of the V1, but was halted to resolve the
cause of the crash. As a result the V2 had a single vertical tail plane,
situated on the centerline. It was powered by a Junkers Jumo 210Aa inverted
Vee, rated at 610 hp (485 kW), driving a 3-blade metal propeller of the
variable-pitch type. It first flew during the fall of 1935. It was first fitted
with dive brakes in the first part of 1936, and subsequently delivered for
official trials in March 1936.
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