GB444746A - Air propellers - Google Patents
Air propellersInfo
- Publication number
- GB444746A GB444746A GB18499/34A GB1849934A GB444746A GB 444746 A GB444746 A GB 444746A GB 18499/34 A GB18499/34 A GB 18499/34A GB 1849934 A GB1849934 A GB 1849934A GB 444746 A GB444746 A GB 444746A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- blade
- blades
- centrifugal force
- block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/30—Blade pitch-changing mechanisms
- B64C11/32—Blade pitch-changing mechanisms mechanical
- B64C11/34—Blade pitch-changing mechanisms mechanical automatic
- B64C11/346—Blade pitch-changing mechanisms mechanical automatic actuated by the centrifugal force or the aerodynamic drag acting on auxiliary masses or surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
444,746. Screw propellers. SCHWARZ GES., G., 44, Oraniendamm, Waidmannslust, Germany. June 22, 1934, No. 18499. Convention date, June 24, 1933. [Class 114] A screw propeller wherein the blades are turned about their axes to vary the pitch is provided with means which are a function of the engine speed and which tend to turn the blades against the action of a resisting means such as a spring, these two controls being interconnected so that the resultant moment acting to turn the blades from one set position to another increases as soon as the resultant is sufficient to initiate the movement of the blades, the latter being then definitely moved from one set position to another. A weight 5 is coupled by an arm 4 to the blade 1 and by centrifugal force tends to move this blade. It is connected by a link 7 to a member 9 under spring control 12 in such a manner that when the centrifugal force is sufficient to overcome the spring the blade is moved and the resisting moment diminishes. The member 9 has two collars 10, 11, which contact with stops to determine the high and low pitch positions. The stop positions may be adjustable as by the movement of the block 13 which is screwed into the engine case. The block 13 may be adjusted by hand or it may have a weighted arm 81 whereby centrifugal force acting against a spring automatically sets the stop position. In one form the connection of the mechanism with the blade is by means of an arm 17 secured to a ring 16 that is attached to a block 14 embracing the blade root. The end positions of the stops may be adjusted from the cockpit of the aeroplane or may be modified automatically in accordance with the variation in pressure due to change of altitude. In a modification the mechanism provides for three stop positions and for this purpose in addition to the main spring a second spring is provided which comes into operation after a predetermined action of the first spring.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE444746X | 1933-06-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB444746A true GB444746A (en) | 1936-03-23 |
Family
ID=6537631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18499/34A Expired GB444746A (en) | 1933-06-24 | 1934-06-22 | Air propellers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB444746A (en) |
-
1934
- 1934-06-22 GB GB18499/34A patent/GB444746A/en not_active Expired
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