1. A gas turbine engine comprising:
a contra-rotating rotor incorporating an electrical generator arrangement,
the contra-rotating rotor including a first hub and a second hub being spaced apart to define a gap and configured to rotate in opposite directions, and
the electrical generator arrangement including a first generator part and a second generator part in each of the first and second hubs, each of the first generator parts in the first hub and second hub being paired with each of the second generator parts in the second hub and the first hub, respectively,
wherein the contra-rotating rotor further includes electrical loads provided on the first and second hubs and configured to connect to the first and second generator parts of each of the first and second hubs, respectively.
2. The gas turbine engine as claimed in claim 1, wherein the second generator part is magnetic and the first generator part is an electrical coil.
3. The gas turbine engine as claimed in claim 1, wherein the second generator part is a plurality of permanent magnets.
4. The gas turbine engine as claimed in claim 1, wherein each hub of the contra-rotating rotor includes a plurality of first and second generator parts.
5. The gas turbine engine as claimed in claim 4, wherein the plurality of first and second generator parts present each first generator part and each second generator part across the gap with all first generator parts in the first hub and all second generator parts in the second hub.
6. The gas turbine engine as claimed in claim 4, wherein the plurality of first and second generator parts in a same hub are concentric with each other with a respective first generator part and second generator part opposite each other in the respective first hub and the second hub part of the rotor.
7. The gas turbine engine as claimed in claim 6, wherein the first generator part is located radially inward from the second generator part in the first hub and the second generator part is located radially inward from the first generator part in the second hub.
8. The gas turbine engine as claimed in claim 1, wherein the plurality of first and second generator parts extend fully or partially around the periphery of the first hub and the second hub.
9. The gas turbine engine as claimed in claim 1, wherein the first and second generator parts within each hub are connected to a plurality of electrical loads located on that hub.
10. The gas turbine engine as claimed in claim 9, wherein the plurality of electrical loads include at least one of an actuator for blade pitch control and a de-icer mechanism.
11. The gas turbine engine as claimed in claim 9, wherein a switch is provided to allow switching between the plurality of electrical loads.
12. The gas turbine engine as claimed in claim 1, wherein the electrical generator arrangement is associated with an electrical power conditioner mechanism.
13. The gas turbine engine as claimed in claim 1, wherein the first hub and the second hub are separately driven by a drive mechanism to cause relative motion between the first hub and the second hub.
14. The gas turbine engine as claimed in claim 1, wherein the first hub and the second hub are associated with a propeller which incorporates one or both of the first and second generator parts opposed by a respective first and second generator parts in the first hub or the second hub.
15. The gas turbine engine as claimed in claim 1, wherein the first hub is a shaft or rotor and the second hub is arranged to rotate about the shaft or rotor.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A venting device adapted to be sealingly received in an opening of a drum, the device comprising:
a body having a pair of opposing sides and defining a plurality of vent passages, each vent passage having an opening at each of the pair of opposing sides and extending through the body, the vent passages being spaced apart and arranged around a center portion of the body;
a membrane structure covering the openings of the vent passages on one of the pair of opposing sides of the body, the membrane structure being sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages, a portion of the membrane structure being further affixed to the center portion of the body at a spot, thereby defining a portion of the membrane structure between the sealing band and the spot, the membrane structure not being attached to the body in the portion defined between the sealing band and the spot; and
a protective structure attached to the body and positioned over the membrane structure.
2. The venting device of claim 1, wherein the membrane structure includes a membrane layer and a backing layer.
3. The venting device of claim 2, wherein the membrane layer comprises a fluoropolymer material.
4. The venting device of claim 3, wherein the fluoropolymer material is PTFE.
5. The venting device of claim 2, wherein the membrane layer has a thickness of about 0.002 inch.
6. The venting device of claim 1, wherein the protective structure is spaced apart from the membrane structure by at least about 0.050 inch.
7. A drum for containing a liquid, comprising:
a bottom structure, a top structure, and a wall together defining an enclosure, the enclosure having at least one bunghole defined therein; and
a closure sealingly engaged in the at least one bunghole, the closure including a body portion having a pair of opposing sides and defining a plurality of vent passages, each vent passage having an opening at each of the pair of opposing sides and extending through the body, the vent passages being spaced apart and arranged around a center portion of the body, the closure further including a membrane structure covering the openings of the vent passages on one of the pair of opposing sides of the body, the membrane structure being sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages, a portion of the membrane structure being further affixed to the center portion of the body at a spot, thereby defining a portion of the membrane structure between the sealing band and the spot, the membrane structure not being attached to the body in the portion defined between the sealing band and the spot.
8. The drum of claim 7, wherein the wall is generally cylindrical.
9. The drum of claim 7, further comprising a protective structure attached to the body and positioned over the membrane structure.
10. The drum of claim 9, wherein the protective structure is spaced apart from the membrane structure by at least about 0.050 inch.
11. The drum of claim 7, wherein the membrane structure includes a membrane layer and a backing layer.
12. The drum of claim 11, wherein the membrane layer comprises a fluoropolymer material.
13. The drum of claim 12, wherein the fluoropolymer material is PTFE.
14. The drum of claim 10, wherein the membrane layer has a thickness of about 0.002 inch.
15. A venting device adapted to be sealingly received in an opening of a drum, the: device comprising:
a body having a pair of opposing sides and defining a plurality of vent passages, each vent passage having an opening at each of the pair of opposing sides and extending through the body, the vent passages being spaced apart and arranged around a center portion of the body;
membrane means covering the openings of the vent passages on one of the pair of opposing sides of the body, the membrane means being sealingly affixed to the body portion in a sealing band surrounding the openings of the vent passages, a portion of the membrane structure being further affixed to the center portion of the body at a spot, thereby defining a portion of the membrane means between the sealing band and the spot, the membrane means not being attached to the body in the portion defined between the sealing band and the spot; and
protective means attached to the body and positioned over the membrane structure.
16. The venting device of claim 15, wherein the membrane means comprises a membrane structure including a membrane layer and a backing layer.
17. The venting device of claim 16, wherein the membrane layer comprises a fluoropolymer material.
18. The venting device of claim 17, wherein the fluoropolymer material is PTFE.
19. The venting device of claim 16, wherein the membrane layer has a thickness of about 0.002 inch.
20. The venting device of claim 15, wherein the protective means is spaced apart from the membrane structure by at least about 0.050 inch.