E-PROPS HI-TECH CARBON PROPELLERS



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HUBS / SCREWS / DRILLINGS

 

 

 

1 - Hubs of ultralights propellers

2 - Drive Lugs

3 - Screws

4 - Drilling patterns propellers for paramotors

 

 

 

 

1 - HUB of ULTRALIGHTS PROPELLERS

 

 

 

montage moyeu

3-BLADES E-PROPS PROPELLER

 

EXCALIBUR-6 montage assembly

6-BLADES E-PROPS PROPELLER

 

 

 

Hubs drawings - DURANDAL propellers : HEP_hub_durandal.pdf

(dimensions of VORPALINE's Hub are the same, except the holes)

 

Hubs drawings - EXCALIBUR propellers : HEP_hub_excalibur.pdf

 

Drawing of the EXCALIBUR-6 hub : HUB_EXC6.pdf

 

 

Warning : the E-PROPS models range ALMACIA, DURANDAL, EXCALIBUR, VORPALINE, BELISANDRE, NAGINATA, CLARENT can not be mounted on engines with a drilling patern 6M8d75, because of the screws.

 

 

Hub drawing - NGD Trike / HAUTECLAIRE : HEPMAB.pdf

 

=> other hubs coming soon, thank you for your understanding

 

 

moyeu e-props hub

 

 

 

 

2 - DRIVE LUGS

 

On some engines, for example 4-stroke ROTAX engines, the propeller is assembled on the engine flange with some drive lugs.

Those drive lugs are essential for the assembly of a propeller on ROTAX serie 9 engines.

 

 

rotax drive lugs                    pions rotax

 

 


As explained by ROTAX, the drive lugs must be inserted in the carbon hub of minimum 4 mm.

 

Please note : some drive lugs are threaded, other smooth. The smooth drive lugs have to be assembled with a lock nut. Do not put lock nut with a threaded lug.

 

To put threaded drive lugs on the flange of a ROTAX engine : it's better to install them before the assembly of the propeller. For that purpose, use a socket of 15, some washers and a screw with the good threading. Very slightly lubricate the screw and the drive lugs (and only the screw, not the blade's foot).

 

 

screws drive lugs rotax e-props

 

 

ploughing effect rotax e-props

 

 

 

 

3 - SCREWS

 

Quality, length and threading of the screws are essential to make a good assembly

Only use screws provided by E-PROPS

If you have not the good screws length to make a good assembly of the propeller on the engine, please contact the E-PROPS team. The team will provide the good screws to you (quality and length).

 

visserie E-Props


Screws totally threaded: for some configurations, E-PROPS provides totally threaded screws. Those screws have the same mechanical strength as partially threaded screws. This solution allows to tighten the screws without a jam on the smooth part of the screw.

Do not replace them by partially threaded screws.

 

vis filetées

totally thread screws



NEVER cut / NEVER thread again aeronautical screws : this would destroy the surface treatment and significantly affect the screws performances. The tightening of the propeller could not be ensured.

The use of screws which are not provided by E-PROPS and/or which have been modified (cut or threaded) results in voiding the E-PROPS warranty.

 


Do not use thread lock : it would give false torque indications. To avoid loosening of screws, please only use the NORD-LOCK washers.

 

 

The tightening of the propellers screws must imperatively be done following the aeronautics rules

 

 

It is imperative to use a calibrated torque wrench to apply the good torque on the screws.

 

 

=> Periodic checks : check of the screws tightening => every 50 flight hours   AND/OR   every 3 months

warning e-props


A check on warm engine AND every 3 months, WHY ?

A M8 screw tightened at 24 N.m extends 0,12%

For a temperature variation of +65°C, the steel expansion is 0,08%.

If you imagne a screw tightening in winter at 5°C, then a use in summer, when the screw easily reachs 70°C (on a warm engine), the residual elongation of the crews is : 0.12% - 0.08% = 0.04%

The remaining screw tightening is : 0.04% / 0.12% = 33%

=> only remains 1/3 of the initial tightening to maintain the blades

Then the blades can slightly move. Frictions generate heat and make the phenomenon worse.

 

That's why the screws tightening must be verified when the engine is warm (so when the screws are warm), and must be checked at every change of season, it means every 3 months.

 

 

 

stickers hubs E-Props

sticker for ALMACIA / DURANDAL / NAGINATA /

CLARENT / VORPALINE-G / EXCALIBUR-3 / EXCALIBUR-4

stickers hubs E-Props

sticker for EXCALIBUR-6

 

 

stickers hubs E-Props

 

 

4 - DRILLINGS : PROPELLERS for PARAMOTORS

 

The paramotors manufacturers are using different types of drilling paterns.

 

Four information are necessary :

- (A) : number of holes

- (B) : diameter of screws (in mm)

- (C) : diameter of the circle on which are the holes

- (D) : diameter of the center hole

 

 

moyeux hélices paramoteurs

 

 

 

 

Some drilling references :

- 6 M8 d75 (it means 6 holes of 8 mm diameter on a 75 mm diameter circle)

- 4 M8 d63

- 6 M6 d50

- 6 M6 d60

- 6 M6 d80

- 4 M6 d50

- 4 M6 d60

- 4 M6 d56

 

WARNING :

On some models drilling parterns are using only 4 holes on the 6 holes. It is normal and those configurations have been calculated and tested.

We have sold hundreds of those models and they are flying worldwide since years.

 

percage holes 4 pour 6

example of assembly of a propeller with 4 holes on an engine with 6 holes (Polini engine)

perfect mechanical resistance / saving weight

 

 

E-PROPS HI-TECH CARBON PROPELLERS