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E-PROPS DETAILS
The E-PROPS PROPELLERS Company
ZI aerodrome Sisteron
04200 VAUMEILH - France
Phone : +33 4 92 34 00 00
Phone reception opened from Monday to Friday
From 9 to 12 a.m and 2 to 4 p.m.
The best way to reach us is by email : helices@e-props.fr

E-PROPS : Leading Edge Protection


The leading edge of the propellers blades needs a reinforced protection, against stones impact or other projectiles, and sometimes against erosion possibly generated by rain and sand.
Some propeller manufacturers equip the leading edge of their blades with metal reinforcements.
Thanks to innovative and efficient products, E-PROPS has chosen another solution. This solution equips thousands of E-PROPS propellers sold since 2008 all over the world.

eprops blade internal leading edge protection
E-Props blade with internal leading edge protection


1- LEADING EDGE PROTECTION : NANOSTRENGTH® ADDITIVE SHOCK
2- COMPARATIVE TESTS
3- EXTRA PROTECTION : POLYURETHANE TAPE


1- LEADING EDGE PROTECTION : NANOSTRENGTH® ADDITIVE SHOCK


All carbon E-Props propellers have a leading edge protection with Nanostrength® additive shock in the epoxy resin.
Made by ARKEMA, Nanostrength® are new innovative additive to reinforce epoxy resin, with high energy absorbing capability.

The resin with Nanostrength® is injected in the leading edge during the manufacturing of blade in RTM (Resin Transfer Molding). It is completely integrated in the blade, without unsticking risks or materials incompatibility, and with a perfect respect for profiles.
This additive has been selected because the leading edge protection of the E-Props propellers range is more resistant as a stainless steel 5/10e (see COMPARATIVE TESTS below), and far more easier to repair in case of shocks.

It has been developped for the UAV with Rotax 914 that E-PROPS equips since 2008, and for ultralights and aircraft which are flying in Africa, on non-prepared airfields in laterite.

E-PROPS customers prefer this type of leading edge reinforcement, because :
- integrated in the blade : no risk of detachment
- no metallic part : no risk of galvanic corrosion
- reinforcement all along the leading edge : not just 20 or 30 cm
- no extra weight on the tips : smaller Moment of Inertia
- possibility to easily repair the leading edge protection, even on a big impact (when a metallic leading edge must be changed - or the whole blade) : every pilot can make this repair himself, with the E-PROPS repair kit (available in this e-shop)


2- COMPARATIVE TESTS


Comparative tests have been made between a Nanostrength® leading edge protection and a stainless steel 5/10e with a system called "Charpy pendulum" :

eprops mouton charpy

In 1901, the French engineer Georges Charpy proposed the "pendulum sheep" still used today.
The purpose of the Charpy test is to determine the impact resistance of materials. It allows to measure their resilience, that is to say the resistance of a material to shocks.

The E-PROPS team has made its own Charpy pendulum :

eprops mouton charpy

Some series of tests have been made to compare a Nanostrength® resin leading edge and a 5/10e inox leading edge.

eprops blindage

Tests Video


eprops blindage helices

shocks after the tests


eprops blindage helices

tests results


eprops blindage helices

stone of the maximum shock (1,12 gr)
speed of the stone at impact : 155 m/sec


eprops blindage helices

Deepth of the maximum impact :
- leading edge inox 5/10e = 2,1 mm
- leading edge resin Nanostrength® = 0,9 mm


The tests results show that :
1/ The leading edge resin Nanostrength® present much less important damages than leading edge inox 5/10e.
2/ The protection with shock additive is integrated all along the leading edge, because the shocks do not happen only at tips.
3/ The leading edge with Nanostrength® shock additive does not lead either unsticking or electrolytic couple.
4/ The possible impacts are very easy to repair. A repair kit is available on this e-shop.


3- EXTRA PROTECTION : POLYURETHANE TAPE


In some specific cases, for example :
- seaplanes
- very long flights under very heavy rains (like monsoon) at high engine RPM
- paramotors : barefoot flights (just above the water surface or the beach) (please note that E-PROPS does not recommend those types of extreme flights)
it could be interesting to put an extra protection on the blades leading edge.

eprops on the beach eprops on beach
eprops on the lake
eprops on sea
in those case, protect the blades leading edge is interesting !


For those types of flights, E-PROPS recommands to add a polyurethane protection tape.
This polyurethane protection tape is made from very high performance elastomer, resistant to erosion, abrasion, punctures, minor impact damage and tears.
Its formula is also resistant to ultraviolet light. Its thickness is 0,36 mm.

This specific polyurethane protection tape is used on certified helicopter rotor blades.
This protection tape does not impact the aerodynamic performances of the blades. The E-PROPS team has made many tests which all show that the performance gap between a blade with a polyurethane protection tape and a blade without this tape is not measurable.

Since 1rst of January, 2019, E-PROPS equips all propellers blades for Ultralights / Aircraft with this polyurethane tape (as standard). This option is free.

This tape is clear and adhesive on one side. It can be painted or applied on painted surfaces.
The relative rigidity of this material makes it very easy to install and change.
It is available on this e-shop, in kits of different lengths.


eprops ruban protection blindage helices






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