E-Props

E-Props : the World’s lightest propellers

  • full carbon construction
  • Thousands of models available
  • For all engines, from 2 to 6 blades, CW and CCW, each 0,5° pitch, diameters 115 to 160 cm
  • Silent, extremely strong, with reinforced leading edge (Nanostrength)
  • ASTM F2506-13 certified
  • Exceptional performances
  • Production : 45.000 blades / year
  • Sold in 80 countries
E-Props UK Main dealer - Wasp Paramotors

Design

  • Propellers of 3rd generation : efficient, ultra-light, quiet and very strong.
  • Made in France since 2008 : see page the E-PROPS company.
  • Adapted diameters and blades’ numbers defined according to engines and reducers.

The secret of their exceptional performances ?

  • Extensive research of the E-PROPS design department, with many tests campaigns on wind tunnel et the development of an exceptional software (LmPTR©).
  • A manufacturing process which allows a very lightweight, this a high reactivity.
  • Specific E-PROPS designs with high CL profiles.
  • SCIMITAR shape : more thrust, less inertia, fuel economy and noise reduction.

PLUG’n’FLY models

  • The E-PROPS PLUG’n’FLY, 100% carbon, are the world’s lightest and strongest propellers.
  • These models fit all engines of paramotors :  2 / 3 / 4 / 6-blades
  • diameters : all 5 cm, from 115 to 160 cm (and very soon, from 165 to 180 cm)
  • all available in Clockwise and Counter clockwise rotation.
  • pitch all 0,5°No other manufacturer in the world offers such different models for so many configurations “engine – gearbox – number of blades – diameters”.

Weight

  • Many 2-blade PLUG’n’FLY, diameters 125 cm, weight less than 500g, about 30% to 60% less than competitor’s props.
  • E-PROPS are by far the world’s lightest propellers

Blades

  • E-PROPS are the only fully carbon fibre propellers for paramotors.
  • Optimum use of carbon fiber braid and epoxy resin to obtain ultra-light and very strong blades.
  • The HCF (Helical Continuous Fibers) process, specifically designed by E-PROPS, ensures an exceptional strength of the carbon braid (like a sock) + epoxy resin blade, from leading edge to trailing edge, from blade’s foot to tip.
  • Manufacturing process : Resin Transfer Molding (RTM).
  • Foam core (D-Box).
  • UV High Resistance epoxy resin
  • Very high carbon fiber ratio : 63%

Blade’s foot

  • PLUG’n’FLY models are fixed pitch.
  • The blades are in two or three section parts, very simple to assembly.
  • The assembly is correct when the stickers are on the same side.
  • Thickness of the blade’s feet (PLUG’n’FLY models) : 28 mm for the classic range,  38 mm for the Scimitar range

Finish

  • Finish: high glosss.
  • The carbon braid remains visible; each blade is unique.
  • No paint, no varnish, no gel-coat, because those finishes are very polluting, and E-PROPS respects eco-management.
  • Furthermore, paints, varnishes and gel-coats do not allow you to easily and properly repair the blades, in case of impact.

Tips

  • E-PROPS has made extensive research on the blades tips, with many tests on different configurations : rounded, cut with angles, with upper or lower winglets…
  • The best performance and the lower noise are achieved with a straight cut tip.
  • All other configurations are for marketing.

Leading edge protection

  • All PLUG’n’FLY have an internal shielding in the blades : injection at the leading edge of a special resin with Nanostrength® additive shock.
  • In special cases (as in foot launches), it is strongly recommended to add extra protection on the blades leading edge, in order to reinforce it, with a polyurethane protection tape used on certified helicopter rotor blades.

Moment of Inertia

  • Strict respect of the MOI limitations given the engines manufacturers.
  • Moment of inertia of each model calculated then verified on the tests bench. For example, MOI about 500 kg.cm² for a 125 cm diameter PLUG model

Balancing

  • E-PROPS propellers are precisely balanced at workshop.
  • The team uses an electronic bench to balance the propellers, with oscilloscopes.
    Please note : the blades do not necessarily have the same weight, but must have the same static moment to be well-balanced.

Quality

  • E-Props propellers are designed, manufactured and tested to meet the requirements of the aeronautical standards.
  • Quality and safety are ongoing concerns for the E-PROPS company, throughout the design, procurement, manufacturing, testing and marketing of all its products.

Repairs

  • Small impacts can be easily repaired (epoxy resin without paint, varnish or gel-coat).
  • If an incident or a shock require an important repair, this must be carried out by HELICES E-PROPS or an agreed repairing center.

Spare Blade

  • With E-PROPS, it is possible to change just one blade.
  • Traceability is very important at E-PROPS :
  • A RFID chip is inserted in each blade, for technical monitoring.
  • Model reference on each blade.
  • Unique serial number on each blade.
  • With this serial number, the E-PROPS team can make a new blade, well-balanced with the remaining good blade.

Mechanical Strength / Load Tests

  • Centrifugal load tests are a very important test in order to define the mechanical resistance of the propellers.
  • All E-PROPS propellers are tested to see how they resist centrifugal load testing.

Tracking / Dynamic gap / Gap from the frame

  • Maximum static tracking : up to 8 mm
  • Tracking is not important if there are no vibrations.
  • Dynamic gap : up to 20 mm (the blade can move towards the engine at maximum power).
  • This gap is depending on the engine assembly, on the cage and on the silent-blocks.
  • Gap from the frame : it is recommended to set the propeller a minimum 40 mm from the cage.

Drilling

  • The PLUG’n’FLY drilling patterns are made to be adapted to each engine.
  • Never put a rubber spacer between the reducer and the propeller; the screws could break.

Tightening torque

  • The screws tightening must be done with a torque wrench; torque value depending on the screws :
    Screws 6 mm = 8 N.m
    Screws 8 mm = 16 N.m

Max RPM

  • PLUG’n’FLY max RPM is :
    3.000 RPM measured at propeller = engine max RPM / reducer ratio.

Max power

  • The power absorbed by the propeller depends on each model.
  • PLUG’n’FLY are designed only for engines with a gear box : never use a PLUG’n’FLY propeller on a direct drive engine (without gearbox).

Maintenance

Maintenance is simple :

  • Before each flight: visual inspection of the propeller (particularly check the leading edge) and check the screws tightness.
  • Every 25 hours of flight or every 3 months : check the screws tightness.
  • Cleaning of a carbon propeller is made with a sponge, with some water with soap, or with a product for windows cleaning.
3 blade e-prop with Hexo frame from Wasp Paramotors UK
fly safe with e-props

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