Junkers Ju 86B Stuka

Junkers Ju 86B Stuka
JUMO 211 Inverted 60° 12 cyl. engine
Junkers VS5 Propeller
Museum of Science and Industry, Chicago, Illinois
Diameter:
11 ft
Weight:
376 lbs.
Blade weight
(wood):
53 lbs.
Reduction ratio
(motor to blade):
1548 to 1
Junkers V.P. Propeller
Junkers VS11 Actuating Mechanism
D
C
B
B
Prop
Blade
F
E
A
Oil Motor: Driven in one
direction or the other by 220
psi oil from the propeller
governor.
Mismatch in gear tooth number between gears E
and F causes shaft F to slightly advance or retreat
with relation to shaft E, thereby rotating the prop
blade