GB1309690A - Supervision circuit for controllable pitch propellers - Google Patents
Supervision circuit for controllable pitch propellersInfo
- Publication number
- GB1309690A GB1309690A GB1309690DA GB1309690A GB 1309690 A GB1309690 A GB 1309690A GB 1309690D A GB1309690D A GB 1309690DA GB 1309690 A GB1309690 A GB 1309690A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pitch
- actual
- circuit
- signal
- propellor
- 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
- B64C11/301—Blade pitch-changing mechanisms characterised by blade position indicating means
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
1309690 Measuring pitch of propellers CHADBURNS (RESEARCH & DEVELOPMENT) Ltd 16 Sept 1971 [30 Dec 1970] 61879/70 Heading G1N In a supervision circuit for a controllable pitch ship's propellor, an alarm signal is generated if there is an error between the actual and desired pitch and the rate of change of the actual pitch is simultaneously less than a predetermined amount. In Fig.2, transducers 14 and 15 generate the desired and actual pitch signals respectively. The error signal is indicated at 29 and fed to comparators 30, 31 having positive and negative reference signals at 32, 33 respectively. The actual pitch signal is differentiated at 35 and fed to comparators 37, 38 having positive and negative reference signals at 39, 40. A logic circuit 34 includes a two second delay to allow for the response time of the system to avoid unnecessary alarms. If the engine is overloaded and the pitch has been reduced for this reason, transducer 19 inhibits an audible alarm 43, but a visible alarm 44 can still give warning. The servo system for the propellor may be mechanical, electric of fluid pressure operated. If a hydraulic system having two pumps is used relay 18 increases the sensitivity of the rate of change circuit when only one pump is working.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6187970 | 1970-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1309690A true GB1309690A (en) | 1973-03-14 |
Family
ID=10487586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1309690D Expired GB1309690A (en) | 1970-12-30 | 1970-12-30 | Supervision circuit for controllable pitch propellers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1309690A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114379770A (en) * | 2022-01-21 | 2022-04-22 | 夏青元 | Unmanned aerial vehicle electric constant speed variable pitch propeller rotating speed and propeller pitch automatic controller |
| EP4019396A1 (en) * | 2020-12-23 | 2022-06-29 | Pratt & Whitney Canada Corp. | System and method for detecting propeller malfunction |
-
1970
- 1970-12-30 GB GB1309690D patent/GB1309690A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4019396A1 (en) * | 2020-12-23 | 2022-06-29 | Pratt & Whitney Canada Corp. | System and method for detecting propeller malfunction |
| US11866151B2 (en) | 2020-12-23 | 2024-01-09 | Pratt & Whitney Canada Corp. | System and method for detecting propeller malfunction |
| CN114379770A (en) * | 2022-01-21 | 2022-04-22 | 夏青元 | Unmanned aerial vehicle electric constant speed variable pitch propeller rotating speed and propeller pitch automatic controller |
| CN114379770B (en) * | 2022-01-21 | 2024-05-14 | 夏青元 | Unmanned aerial vehicle motor constant speed variable pitch screw rotational speed and pitch automatic control ware |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
| PCNP | Patent ceased through non-payment of renewal fee |