Tandem Rotor
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 Esky 24G 4CH Tandem Rotor Mini Chinook RC Helicopter in Aluminum CaseCAMO USA $109.00 Time Remaining: 14d 21h 29m Buy It Now for only: $109.00 |
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 74V 450mAh Li polymer Battery for Tandem Rotor 002484 Esky $13.99 Time Remaining: 22d 22h 22m Buy It Now for only: $13.99 |
 ESKY 002482 HELICOPTER TANDEM CHINOOK ROTOR BLADES A $12.25 Time Remaining: 3d Buy It Now for only: $12.25 |
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 E Flite EFLH2220W White Lower Main Rotor Blades 2 Blade Tandem Rescue New $1.97 Time Remaining: 7d 16h 56m Buy It Now for only: $1.97 |
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 EFLITE BLADE MCX TANDEM BMCXT EFLH2217 LOWER ROTOR HEAD $2.29 Time Remaining: 20d 10h 12m Buy It Now for only: $2.29 |
 ESKY 002482 HELICOPTER TANDEM CHINOOK ROTOR BLADES A $10.50 Time Remaining: 16d 13h 32m Buy It Now for only: $10.50 |
 SYMA S022 CHINOOK 3 CHANNEL TANDEM ROTOR RC HELICOPTER $79.99 Time Remaining: 24d 1h 47m Buy It Now for only: $79.99 |
 4 Replacement Main Rotor Blade Prop for Syma S026G Chinook Tandem rc Helicopter $9.56 Time Remaining: 27d 15h 12m Buy It Now for only: $9.56 |
 RC Helicopter Esky 24GHZ 200mm Tandem Rotor Aluminum Case $106.99 Time Remaining: 18d 9h 35m Buy It Now for only: $106.99 |
Tandem Rotor
Progressive Cavity Pump
Sometimes referred to as an eccentric screw pump or simply a cavity pump, a Progressive Cavity Pump is a device that makes it possible to move fluid through a series of small chambers or cavities with the use of a rotor. This type of action makes it possible to control the flow of the liquid in a manner that ensures that the progress of the flow is consistent and easily managed. Pumps of this type are used in a number of different applications, including drilling for oil, water, and natural gas.
While there are slightly different design elements in different versions of the progressive cavity pump, most models feature a helical rotor along with a series of progressively smaller chambers or cavities. A stator, normally made from rubber, works in tandem with the rotor to create a secure seal. As the rotor initiates the movement, each of the chambers or cavities also move, filling with liquid as the rotation continues.
The benefit of this design is that it is possible to use progressive cavity pumps to move liquid along at a slower pace, while applying varying rates of pressure to the liquid. The wear and tear on the pump itself is kept to a minimum, since each succeeding cavity has only to deal with the rate of pressure related to moving the fluid into the next chamber. This helps to maintain a constant balance in pressure, while still providing the operator with a degree of control that is not possible with other types of pumps.
There are a number of different applications for the progressive cavity pump. In the case of oil wells, this type of device is ideal for pumping oil through a well and into storage containers. Many sewage systems make use of this type of pump as a means of controlling the flow of sewage and sludge through the purification process. It is not unusual for corporations that make use of large quantities of chemicals in their manufacturing processes to use a progressive cavity pump in order to make sure the exact amount of each chemical compound is employed in each lot of product.
There are other uses for the progressive cavity pump. Wineries can make use of the pump to move liquid through the distillation process at a measured pace. Shipyards and other marine centres often employ progressing cavity pumps as part of the process of lubricating engines and filling tanks with fuel. A pump of this type can even be used in construction projects to move cement and grout into position.
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What happens if an engine/rotor fails on a tandem rotor helicopter or V-22 Osprey?
Can they autorotate their failed rotor and stay balanced to make an emergency landing or is it all over if they lose one?
The key to your question is that a transmission mechanism allows each engine to drive both rotors. Both engines power both rotors. A failure of one engine will not cause either rotor to stop. These aircraft will be able to land with power on only one engine.
If a tandem rotor helicopter loses BOTH engines, it can autorotate like any other helicopter.
I'm not an expert on the V-22, but my understanding is that it cannot autorotate, or at least cannot autorotate very well under most conditions, if it loses both engines.
Esky Tandem Rotor 2.4GHz RC Coaxial Remote Control Helicopter LiPo RTF 002328
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