Look Who it Was Random video

E Prop from Evolution Trikes REVO Light Sport Aircraft Trike

3,499 views · Published 2 May 2017 · 11:34 · Indexed 24 October 2026

Channel: Light Sport and Ultralight Flyer · 2017 · Sports

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http://www.ultralightflyer.com – E-Prop, Helices E-Props, Evolution Trikes REVO light sport aircraft weight shift trike.

The HELICES E-PROPS company designs, manufactures and markets propellers for light aircraft : airplanes, ultralights, delta trikes, gyroplanes, airships, paramotors and UAV.

Since 2008, those innovative propellers are manufactured in France (South-East, Provence), by a team of 21 people.
E-Props propellers UL-PROPS range are designed and manufactured to be very light and strong. The blades and the hubs are 100% carbon, with an integrated leading edge protection, fixed pitch, adjustable pitch or in flight variable pitch. The performances of the adjustable props are exceptional because of a very high ESR effect (propellers of 3rd generation). Those results are validated by flight tests campaigns. Today thousands of E-Props propellers are equipping more than 170 different ultralights models (excepted paramotors) and aircraft, and are sold in 62 different countries.

The design department establishs the specifications of each propeller by taking into account:
The characteristics of the engine (power, troque, thrust, RPM)
The airframe which is going to be equipped with this optimized engine + propeller
(tractor or pusher configuration, aerodynamic characteristics, wings / fuselage interaction...)
The required performances of the aircraft
The conditions of use and the missions of the aircraft

To optimize a propeller, for a specific engine and a specific aircraft, is a complex task because :
- flight speed, engine RPM and power are compulsory
- propeller diameter is limited either by aircraft geometry (ground clearance or fuselage clearance) or by peripheral speed (supersonic issues).
 
Propulsion efficiency factor is calculated from propeller diameter and engine power. This efficiency factor is the max achievable propeller efficiency. Then, it is up to the propeller designer to come closer to this limit.
 
The available optimization parameters are :   
- number of blades
- blade loading distribution vs span
- chord distribution 
- pitch distribution
- airfoil vs span 

To increase number of blades allows reducing lift of each blade. So the induced drag of each blade is reduced. But, with a constant chord, this increases the friction drag. And if chord is reduced, Reynolds number decreases and airfoils characteristics are degraded. Use of small chords also leads to mechanical strength issues.
 
When looking for the optimum load distribution, Induced drag must be taken into account. For example, blade tip cannot generate high lift without high induced drag.     
 
Chord optimization leads to use each airfoil at best lift/drag ratio, without forgetting Reynolds variation effects and checking airfoil matching to CL conditions (Reynolds and Mach).
 
Pitch distribution is used to maintain an optimum lift coefficient to each airfoil in order to get the chosen lift distribution with the optimized chord and airfoil distribution.
 
 
Linked to this complex process, propeller design is an iterative calculation. The modification of one parameter leads to change the others.

 
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http://www.ultralightflyer.com - E-Prop, Helices E-Props, Evolution Trikes REVO light sport aircraft weight shift trike.

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