The revolutionary Power Mast with 2 sets of co-axial counter-rotating propellers (4 eFANS)

THE SILVERCRAFT SH4 CERTIFIED by F.A.A (N° H2EU) in U.S.A. (N° IM 54) in FRANCE and R.A.I (N° A 145) in ITALY

Mounting the electric propellers directly on the main rotor leads to no torque exchange betwen main rotor and fuselage.

The Powermast makes useless:

  • Fuel Engine
  • Main rotor
  • Tail rotor
  • Tank Fuel
  • Free wheel
  • Tail beam
  • Oil pump
  • Oil tank
  • Lubrication system
  • Engine shroud

The Result:

  • Green Flight
  • Low Cost
  • Low Noise
  • Easy to pilot (Autopilot ready)

This allows us to save around 1000 lb that are allocated to the battery pack or to the payload.

This means more load capacity and longer flight duration in the near future


The two small electric ducted fans are used to provide control and directional stability around the yaw axis.

No torque exchanged between
the main rotor and fuselage.

Download the Paper : Forum 75
Advanced Vertical Flight II
Technical Session C: Wed. May 15, 2019
Performance and Design Optimization
of the F-Helix eVTOL Concept (Paper 57)
Umberto Saetti,* Jacob Enciu, Joe Horn
Pennsylvania State University

Download the Paper : Forum 76
Electric VTOL Testing & Certification
Special Session 3: Thu. Oct 08, 2020
Flight Dynamics and Control of an eVTOL
Concept Aircraft with a Propeller-Driven Rotor
Umberto Saetti,* Jacob Enciu, Joe Horn
Pennsylvania State University

Blue Edge-Like Blades

50% less noise

Compared with a conventional blade, the Blue Edge has a tip with both forward and rearward sweep. This gives the blade more time to interact with the vortex 'shed' by the rotor, reducing the characteristic impulsive (slap-slap) blade-vortex interaction noise generated by a helicopter

Blue Edge is a trade mark of Eurocopter.

FCH2O - Fuel Cell H2O


The aviation world will soon see the appearance of eRotorcraft and eVTOL for Uarban Air Mobility.

The biggest problem with these aircraft are the batteries capable of providing adequate power for sufficient time for both Intracity and Intercity transfer flights.

To date, the use of lithium batteries does not allow to achieve appreciable results: too heavy and little storage capacity.

Hence, FCH2O aims to create much lighter hydrogen fuel cells with a high power density.

Our patent allows us to reduce the weight of current fuel cells by 35%.

In rotating propeller systems, every kg saved is a success.

The first eRotorcraft to consider adopting Fuell Cell is the F-Helix from Ierom srl - Italy -

The simulator results are exceptional and this is also due to the fact of the particular mast rotation system - PowerMast.

F-Helix is able with a 74 kWh fuel cell integrated with a 5kWh lithium battery pack to reach 3 hours of autonomy for over 400 km of range.