VTOL aircraft with HOPE

Vertical Take Off and Landing Powerplant for aircrafts


The aircraft design has numerous desiderates and one of them remains to achieve the Vertical Take Off and Landing in a safe and reliable manner.

Problems to be solved

  1. Creation of a new class of aircraft and propulsion system combining characteristics of helicopters and airplanes.
  2. Creation of effective, reliable and safe aircraft that do not require special places for takeoff and landing and for which the contact with obstacles would not lead to disasters.
  3. Creation of an aircraft for a wide range of everyday tasks and emergency situations.

 State of the art


-Too complex and expensive;
-External dangerous open rotors;
-Difficult to be controlled. Only for very talented pilots;
-Low flight efficiency.



Entecho concept employs a novel flexible shroud and radial fan which works in conjunction with a unique combination of lifting surfaces to achieve lift and control. The fan configuration ensures a uniform and optimum flow over the length of each blade and packages a very large blade length within a small envelope. The resultant low blade speed provides the benefit of reduced noise and decreased danger to operators and/or passengers. This configuration also ensures that the fan disc loading is kept as low as possible to efficiently generate significant lift.

A operational demonstrator was achieved. See




Entecho : http://www.entecho.com.au/

-Low value of the working surfaces reported to the vehicle foot print;
-Relatively low impulse of the air mass;
-The cockpit obstructs the entry of the air into the fan;
-Too complex drive of the fun (with at least three electric motor) and too expensive;
-In this configuration is difficult to employ an internal combustion engine which represents the cheaper solution for the powerplant.


New VTOL Powerplant for aircrafts VTOL -PP


VTOL-PP uses a revolutionary design, without airscrews, and generates lift within a relatively small diameter body by employing a unique combination of lifting surfaces. This is primarily because it allows the creation of an extremely compact aerial vehicle which has VTOL capabilities and high lifting efficiencies.  VTOL-PP mainly employs two centrifugal fans which are superposed, creating a unique combination of lifting surfaces and a double flux air distribution. Each centrifugal fan and its envelope form a centrifugal or radial compressor. Each centrifugal compressor moves the air from the upper surface to the lower surface. The fans are acted by one or two electric motors. The rotation motion of one fan is contrary to the other and will be not necessary other anti-torque system.

Cross section VTOL-PP

The lift is generated by creating a depression on the upper surface and a big pressure on the lower surface. The air entries and exits are designed to use the entire upper surface and the entire lower surface. So, doe to the ducts arrangement the entire upper and lower surface is used. Additional lift is obtained by the huge impulse of air mass directed downward by the both compressors.

3D section

An aircraft configuration uses at least one VTOL-PP double flux powerplant arranged in an innovative manner. 

The main aircraft configurations are:
-Compound aircraft;
-Suspended cabin aircraft;
-Personal aircraft;
-Tandem aircraft;


Compound aircraft


This aircraft uses a single VTOL powerplant and can takes-off vertically but in horizontal flight can use also some fixed wings like a normal airplane to supplement sustentation and be more economic. At least an additional propeller or turbojet is used to provide the horizontal flight. If a propeller is used, this can be protected by an envelope.

Personal aircraft


In this case the pilot use a frame which is also suspended by a single VTOL powerplant. In this case the horizontal flight is obtained by inclining the VTOL powerplant with an angle reported to the frame

Tandem aircraft


Tandem aircraft uses two VTOL powerplants arranged in “tandem”.  Between the VTOL powerplants is located the cabin which can accommodate at least two person. The cabin can support two fixing wings located in the middle area. 

Tandem configuration

In the pure electric variant of Tandem aircrarft, the two or four electric motors are supplied with electricity by a number of modular batteries which are mounted in the lateral walls of the cabin. The system can work with minimum two batteries. If the travelling distance is short only two batteries will be used. The number of embarked batteries increases with the distance. This system, with modular batteries, avoids transporting a futile mass. On the other hand, if the batteries are discharged, they can be easy replaced (being modular) and Tandem aircraft is very quickly prepared for the next fly.  See




Tandem configuration or Vertoflyer

In the hybrid variant of Tandem aircraft, the two or four electric motors are supplied with electricity by an alternator acted by a high power density IC engine.

Tandem aircraft can be launched and landed almost anywhere. The lift is ensured by the two powerplants. After vertical lift the throttles of the nozzles are gradually open and an horizontal thrust is created. If the horizontal speed increases sufficiently,  a big part of the sustentation is created by the fixed wing and a small part by the two vertical powerplants.



Drone can use a single VTOL having attached on the underneath area a compartment containing the propulsion, the sensors/cameras, etc. For horizontal flight the drone body ca inclined by the help of a skirt which can be deformed.

Concept advantages

As opposed to the mechanically complicated cyclic swash-plate and mechanically coupled tail rotor found in a conventional helicopter, the presented aircraft implements a simple, safe and low weight construction. This system uses fewer and simpler parts than a conventional helicopter, which should ultimately make it less expensive to manufacture and maintain. 

Compared with Entecho concept (already proved), VTOL-PP offers double working surfaces reported to the footprint and double air impulse. Also the entry of the air is not obstructed. That means VTOL-PP can be at least twice more efficient than Entecho concept reported to the same external diameter.

VTOL-PP, with double parallel flux, could have for the VTOL aircrafts the same impact that had the double flux Turbofan engine for the jet aircrafts.