OTHER: Miscellaneous - Thoughtless Idea - Engine for Coaxial Rotors

• Mobile of Roots blower operation of; http://www.mekanizmalar.com/roots2.html
• This 'engine' consists of a power source and integral speed reduction.
• It is located on the same axis as two counterrotating rotors and is positioned between the rotors. [Pinion A] drives a [Ring gear A] (not shown) that is directly attached to the lower rotor. [Pinion B] drive a [Ring gear B] (not shown) that is directly attached to the upper rotor. No additional speed reduction is required.
• As an alternative, The motor could be located below the two rotors. In this arraignment the two ring gears would be attached to two masts that went up to thier respective motors.

• High temperature water is metered into the high-pressure area, where it is immediately converted to steam. The pressure is exerted against lobes of the Roots type gears. It rotates the eight Root gears marked 'Lobe A' in a CCW direction and the eight Root gears marked 'Lobe B' in a CW direction. Lobe gear A is connected to a lower pinion gear A and lobe gear B is connected to upper pinion gear B.
• This means that all eight lower pinions rotate counter clockwise. About these eight pinions and in contact with them is an internal ring gear and it will rotate CCW, at a slower rotational speed. . The internal ring gear is directly connected to the lower rotor, which also rotates CCW. Conversely, the upper rotor is drive CW, and identically by the upper pinions and upper internal ring gear.
• Consideration Regarding the Recirculation of Steam back to Water.
• The spent steam is gathered in the collector, converted to water and then re injected in a metered amount back into the high-pressure area.
• The heat required to convert the water to steam may come from any device that is capable of converting stored energy into heat.
• Review and evaluate enthalpy of vaporization to see if recirculation is a viable option. If not eject the stem in a direction that contributes to; rotation of the rotors, forward thrust or flight-control.

• A carbon filament wound cylinder that discharges a gas or air via a regulator into the high-pressure area. See air car on web.
• Perhaps the gas that has exited the 'engine' can pass into the blade to drive a cold tip jet or root jet.
• Perhaps this gas that has exited the 'engine' can be used to provide flight-control,

• The Roots Blower

Detailed Information: (rough working notes ~ 'cause I've got a lot to learn)

• A circulatory system. Consider having the following three zones.
• Expansion zone: The liquid is injected at a controllable rate and converted to a gas by a heater. It is then ejected by driving the lobes.
• Contraction zone: (collector) The pressure of this zone is regulated to control the rate of condensation. The liquid is injected into the Intermediate zone.
• Intermediate Zone: The temperature and the pressure of the liquid is increased in preparation for re injection into the expansion zone. This zone is probably necessary because the boiling temperature is above the surrounding temperature. A thought ~ the more that this 'system' can be isolated from the surrounding temperature. the more ....????....
• The idea (hope) is to continually convert the substance between a liquid state and a gas state, while minimizing the amount of energy required to do this. I.e. the smallest temperature differential.

Changes of State:

• Other liquid/gas substances (what is the correct word?) should be considered.

Physical properties of gases

• The surfaces of the lobes must be coated in a material that has low heat absorption. Perhaps boron might do. This is necessary so that the lobes do not cool when on the discharge side and then cause some of the gas to condense on them when on the pressure side.
• The change between the boiling temperature and the condensation temperature.

• Would a Sterling Engine provide the high-pressure gas for the engine on this page? See this file; 1311.pdf From Pascal.

Primary Questions:.

1. Does this proposed method have a thermodynamic and mechanical efficiency that equals or surpasses current power sources?
2. If 1 is positive, then; does this proposed method have a weight that is equal to or less then the current power source?
3. If 2 is positive, then; does this proposed method have a reliability that is equal to or surpasses current power source?
4. If 3 is positive, then; why is this proposed method not being built.

• The weight should be less than that of an internal combustion engine, transmission and power train. This depends on what provides the pressurized gas.
• There are multiple load paths between the high pressure and the direct driving ring (internal) gear at each rotor.
• The pressure on the lobe sets will be balanced since the air pressure has equal distribution. This may vary slightly depending on the azimuth of the lobes, however it does not represent a shock load.

• Yaw Control Idea: Could yaw be controlled, at least while the motor is operational, by exhausting the spent gas out of rearward facing vents. There would be one vent on each side of the craft and yaw would be achieved by proportioning the gas venting between the two vents. Both vents would release an equal amount of gas during forward flight and thereby provide some propulsion.
• Additional Power Extraction: (wild idea) Could the vents be made more efficient by including a sort of turbofan arraignment so that more thrust can be extracted from the 'exhausts'?
• Hover versus Cruise: During hover the spent exhaust could be vented from the trailing side of the root of all blades. This will contribute slightly to the rotation of the rotors. During cruise it would be detrimental to exhaust are from the trailing side of the root of the retreating blade since the 'push' of the air is opposing the forward flight. Therefore, during cruise all of the exhaust should be vented from the trailing side of the root of the advancing blade only.
• This azmithual distribution of thrust is also a primary component of the proposed Root Turbofan Rotor.

• There have been many somewhat similar idea and it appears that they have limited efficiency due to the problem of sealing the area between the moving part and the housing (i.e the problem that is solved buy the piston rings on a conventional reciprocating engine). Perhaps this engine has a small advantage in that the exhaust can be utilized in 'root' jets to rotate the rotors.
• There are a lot of gears; in fact many more than in a conventional transmission. This may be OK since these gears a basically independent from each other. It should be possible to assure that the failure of one is not detrimental to the operation of the others.

• OTHER: Helicopter - Inside - Coaxial - Electric Motor Located between Rotors

Alternative: Mentioned by quadrirotor on Rotary Wing Forum.

• OTHER: Miscellaneous - Thoughtless Idea - Engine for Intermeshing Rotors

• OTHER: Helicopter - Inside - Coaxial - Electrotor ~ MicroLite C
• OTHER: Helicopter - Inside - Coaxial - Electric Motor Located in Rotors

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