E-PROPS HI-TECH CARBON PROPELLERS



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E-PROPS PROPELLERS : GROUND TESTS

 

propellers E-Props essais au sol tests on ground

 

The team Hélices E-Props is doing several tests campaigns every year to validate its propellers. During 4 years, tests on more than 200 models in beech multiplis have been done in order to develop the LmPTR© software.

All carbon models have been tested to verify their performances, the mechanical strength, and the adequacy of the engines.

 

essais hélice ulm

 

 

Tests have also been made in a wind tunnel, during carbon propellers' developments for UAV. These tests are at the moment confidential and cannot be published. They have allowed to verify numerous hypotheses and to enrich the LmPTR© software.

 

 

 

SOME GROUND TESTS CAMPAIGNS E-PROPS CARBON

(click on the links to see the details of the tests)

 

 

- Centrifugal load test of a carbon E-Props propeller (propeller for direct drive engine)

Results : safety coefficient = 7,2. The system carbon hub + blade can hold 6 times the maximal load during 1 hour without any damages (EASA CS-P asks only 2 times for certified propellers).

 

 

- Fatigue tests

stress the blade with alternating bending, to reproduce the engine's torque, and to establish the real propellers MTBO (Mean Time Between Overhauls)

Between July 2013 et January 2014, the tests campaigns have validated a MTBO for the carbon E-Props propeller of : 2.000 hours

Disassembly at 2.016 hours (more than 360 millions of cycles) : nothing to report

These tests results are extremely satisfactory, because they consolidate calculations and modellings of our engineering department by a check in real conditions at 10 times the worse case of functioning.

=> see the video

 

 

- Centrifugal load test of a PLUG'n'FLY propeller

Results : safety coefficient = 4,6. The system carbon hub + blade can hold 4 times the maximal load during 1 hour without any damages (EASA CS-P asks only 2 times for certified propellers).

 

 

- Leading edge protection

Comparative between inox and Nanostrength® leading edge protections

=> see the video

 

 

 

 

 

 

=> OTHER TESTS : FLIGHT TESTS

 

 

 

 

 

 

TESTS BENCHES - HELICES E-PROPS

 

banc d'essais hélices e-propsbanc de fatigue hélices e-propsbanc de traction hélices e-propsbanc de traction hélices e-props pour essais de froce centrifuge

tests benches

 

systèmes de capteurs hélices e-propscapteurs électronique mesure du couple hélice e-props sur moteur genesis

electronics sensors

 

 

  • A - Test bench with instruments and traction measurement system.

 

  • B - Fatigue tests bench, to stress the blade with alternating bending, to reproduce the engine's torque, and to establish the real propellers MTBO.

 

  • C - Traction tests bench. 40 tonnes hydraulic cylinder.

 

  • D - System of electronic sensors (accelerometers and strain gauge), which is settled on the propeller's hub. A wireless connection Bluetooth allows to get back the data on a computer in the plane.

 

 

 

 

 

 

 

E-PROPS HI-TECH CARBON PROPELLERS