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E-PROPS TESTS

 

 

 

1 - Flight tests : comparative tests made by the E-Props team and by users

2 - Ground tests : mechanical strength, vibrations, fatigue...

3 - Flying test bench

 

 

 

1 - FLIGHT TESTS

 

 

The E-PROPS propellers are tested on ground (see below), and also on flight. A lot of flight tests campaign are made by customers, especially during carbon propellers' developments for UAV. Some flight tests are confidential, but some have been published.

Here below are some results of these tests.

 

 

 

SOME FLIGHT TESTS CAMPAIGNS E-PROPS

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

 

 

larry mednick presentation

see the LARRY's presentation

interview by DAN JOHNSON - April 2017

 

 

- Comparative between E-PROPS 3-blades DURANDAL adjustable versus DUC 2-blades FLASHBLACK variable on SHARK

Choose the E-PROPS and gain :

- 15 km/h max speed

- 3,3 kg

- more than 5 000 euros

- a great ease of use      (April 2018)

E-PROPS: better performances as with a variable pitch propeller !

 

 

 

- E-PROPS : the best propeller for the CTLS

detailed argument - Oct 2017

 

 

- Comparative tests : E-PROPS versus DUC SWIRL on Savannah

made by Savannah Africa - July 2017

In conclusion the E-Props Durandal is the better propeller

 

 

- REMPLACEMENT d'une BIPALE WOODCOMP PAS VARIABLE 170 cm par une TRIPALE E-PROPS DURANDAL 100 M 170 PAS REGLABLE sur ZENAIR 601 XL

replacement of a 2-blades variable pitch Woodcomp propeller with a 3-blades E-Props Durandal ground adjustable pitch

E-PROPS: same performances as with a variable pitch propeller !

 

 

- EXCALIBUR-6 on MTO SPORT 914

Customer Feedback May 2017

Thrust 30% more than with the Autogyro 3-blades

 

 

- E-PROPS : the best propeller for the Savannah

detailed argument - March 2017

 

 

- Tests : DURANDAL 100-M 180 on SKYRANGER 912S

made by E-Props team / May 2016

 

 

 

avis clients e-props

CUSTOMERS FEEDBACK

 

 

 

 

- Comparative tests : propellers for Gaz-Aile

Tests made by the pilots of the Gaz'aile association

Comparative of :

- Variable pitch propeller PENNEC design PENNEC 2-blades diameter 146 cm
- Fixed pitch PENNEC design 2-blades diameter 146 cm
- Adjustable pitch E-PROPS VORPALINE S 3-blades diameter 152 cm

Match E-Props / Pennec Variable pitch = E-Props wins !

E-PROPS : better than a variable pitch propeller !
Best performances, more simple = security, weight

Test report (Nov 2015)

 

 

- Comparative tests on WT9 tow aircraft (April 2016)

The 3-blades E-PROPS propeller ground adjustable pitch
- is lighter (gain 9,5 kg)
- less expensive (gain 3 879 €)
- with a 6,5 time higher TBO
is significantly more efficient than the 3-blades variable pitch WOODCOMP

=> PDF file

=> comparative video (Aspres / Buëch, April 2016)

 

eprops remorqueur

 

 

- Comparative tests Durandal 80-S / WarpDrive on CNSK aircraft Europa

made by a owner / pilot of Europa. Objective : increase the rate of climb

Gain of weight = 2,2 kg

Gain of rate of climb = + 15%

- Test report (Jan 2016)

- Comparative between a Warp Drive and an E-Props on EUROPA aircraft (THE EUROPA FLYER, december 2017)

 

 

- Comparative tests : propellers on MB2 Colibri (HAPI VW engine 1835 cm3, 65 hp)

Made in Switzerland

Comparative of :

- 2-blades fixed pitch ArrowProp diameter 132 cm
- 3-blades adjustable pitch E-PROPS BELISANDRE diameter 146 cm

Better performances in roll distance (gain of 30%), airborne distance, climb rate and noise measurement => gain of 5,9 dB(A)

Test report (3rd quater 2015)

 

 

- Comparative propellers tests made on WT9 Dynamic Club SD tow aircraft (May 2014)

Between :

- reference propeller : composite 3-blades ground adjustable pitch

- E-Props Durandal 100-R propeller : carbon 3-blades ground adjustable pitch

 

Result : with the E-Props, rate of climb is better of more than 30 % against the reference propeller

 

* Test report dated 17/01/2007 : Dynamic with reference propeller

* Test report dated 20/05/2014 : Dynamic with E-Props propeller

=> Summary July 2014

 

comparative flights tests between propellers on WT9 tow aircraft

 

 

 

- Tests of a DURANDAL 100-S propeller on a aircraft MCR4S 912S

Test pilot : M. Michel Riazuelo. MCR4S F-PADC (n°166) – Mai 2014 – Cholet Le Pontreau airfield

"Performances at take-off and climb are better with E-Props than with 3-blades Dyn'Aero propeller"

=> See the tests here (in French)

 

 

- Tests of a DURANDAL 80-S propeller on a MCR 912

Test pilot : M. Michel Riazuelo. MCR Sportster F-PMTR (n° 256) – April 2014 –Cholet Le Pontreau airfield

"Take-off and climb performances with the E-PROPS are better than those obtained with EVRA propeller, and are similar to the performances obtained with a variable pitch propeller ARPLAST PV50 Constant Speed".

=> see the test report (in pdf, in French)

=> see the news of the Blog

 

 

- Comparative tests between propeller EXCALIBUR / reference propeller

Technical comparison established between an E-PROPS 4-blades EXCALIBUR and a reference propeller on a gyrocopter MAGNI M16 equipped with a ROTAX 914 turbo.

- EXCALIBUR allows a gain of 35 km/h in cruise

- reduction of the vibrations of the gyrocopter

- lower noise on all the range of RPM

- fewer gyroscopic effects

=> see the test report

 

 

- Comparative tests between propeller DUC FLASH / propeller E-Props DURANDAL

Session 1 : usefull thrust 14 kg more for the DURANDAL XL compare to the FLASH. DURANDAL XL is 1,7 kg lighter compare to the FLASH.

Session 2 : Propeller E-PROPS DURANDAL 100 – L on a G1 ultralight :

- increases maximum speed of 5 km/h

- increases climb rate of 20%

- decreases fuel consumption of about 0,5 liter/hour

- is 40% lighter

than the DUC FLASH propeller

Note : carbon E-Props propellers hold during 1 hour the load at which the FLASH propeller breaks (see test report of the FLASH in its Instruction Manual)

=> See comparative evaluation betwen Duc Flash and E-Props Durandal

 

 

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2 - GROUND TESTS

 

 

The E-Props team 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, which is continually updated by new data.

 

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.

 

 

2.1 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

 

 

 

2.2 E-PROPS TESTS BENCHES

 

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.

 

 

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3 - E-PROPS FLYING BENCH

 

 

 

2015 : E-Props has acquired a SKYRANGER with a 100 hp Rotax 912S

 

skyranger e-props banc d'essais

 

 

 

This investment has been made in order to continue testing the E-Props for aircraft and ultralights. This aiprlane is equipped with innovative instruments (DAU : Data Acquisition System) to record all propellers parameters in all flight configurations, to propose ever better propellers.

 

This DAU allows to obtain the following parameters at each moment of the flight :

- propeller traction

- propeller torque

- T°

- static et dynamic pressure

- RPM

- T° and manifold pressure

- angle of attack and angle of sideslip

 

 

Then data are integrated in the LmPTR© software (see page DESIGN).

Different curves allow to compare different designs.

 

 

courbes helices E-PROPS LMPTR

 

 

 

 

 

 

 

 

E-PROPS HI-TECH CARBON PROPELLERS AIRCRAFT ULTRALIGHTS PARAMOTORS HELICES ULM AVIONS PARAMOTEURS ELICA ELICHE PARAMOTORES E-PROPS HI-TECH CARBON PROPELLERS