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EXTENDED HUBS

 

 

E-PROPS has developed an innovative system to replace the usual spacers in aluminium (heavy, expensive and difficult to assemble) : the extended hubs.

For the moment, this light, strong, secure and cheap solution is available for the 3-blades tractor propellers for Rotax serie 9 engines.

 

 

presentation video

 

 

 

EXTENDED HUBS SYSTEM =>


1 - an important weight reduction : up to 2 kg only for the spacer

2 - less weight on the gear box = longer lifetime of the reducer
3 - a lower cost : the Extended Hub option is offered

4 - less vibrations because of a direct centering of the propeller
5 - a fast and easy assembly : reduction of 61% the number of parts

6 - a reliable and durable system

 

 

12 lengths available : from 0 to 120 mm, on 10 mm increments

Extended hubs : 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 - 100 - 110 - 120 mm

 

extended hubs eprops propellers

some examples of E-Props extended hubs

 

 

 

1 - WEIGHT REDUCTION

 

weight of the spacer (carbon extended hub) = 3.5 gram * Se in mm (including screws)
it means 3.5 gr/mm

To be compare with 20 gr/mm of a usual aluminium spacer (with screws)

 

Example for the spacer of a Savannah ultralight :

- weight of an E-PROPS extended carbon hub, length 120 mm (including screws) = 0,42 kg

- weight of an usual aluminium spacer, length 120 mm (including screws) = 2,4 kg

it means a reduction of 2 kg !

 

 

 

2 - PROTECTION of the GEAR BOX

 

A too big weight hanged to the gear box is reducing its lifetime.

The heavy propellers generate a significant risk of breakage of the gear box.

Reducing the weight of the spacer allows to limit this risk.

 

 

 

3 - LOWER COST

 

The extended hubs are at the same price as the standard hubs.

No need to buy a spacer in addition.

Considerable savings !

 

 

 

4 - LESS VIBRATIONS

 

With an extended hub, the propeller centering is direct. No need of spacers and screws stacks, which can generate vibrations.

A simple system reduces the vibrations risks.

 

 

 

5 - SIMPLE ASSEMBLY and REDUCTION of the NUMBER of the PARTS

 

 

 

montage moyeu prolongé e-props

A

6 Screws + 1 central nut (for the central screw of the hub)

B

7 Nord-Lock washers

C

1 Flange in anodized aluminium

D

1 upper Half Hub

E

1 lower extended Half Hub

F

Option : 5mm counterplate to adjust the length of the hub (only if necessary)

G
1 reducer flange (on reduced engines) or engine flange (direct drive engine)

H

6 drive lugs : threaded or smooth

I

Option : 6 smooth washers => only for the direct drive engines (smooth drive lugs)

J

 

 

 

Option : 6 nuts => only for the direct drive engines (smooth drive lugs)

In case of threaded drive lugs, the use of nuts is absolutely forbidden.

In case of direct drive engines, the use of threaded drive lugs is absolutely forbidden.

The tightening torque must be applied on the nut side.

 

 

3-blades propeller with ISS : 3 blades, 2 half hubs, 1 aluminium flange, 7 Nord-Lock washers, 6 screws, 1 nut
It means 20 parts

3-blades propeller with aluminium spacer : 3 blades, 2 half hubs, 1 aluminium flange, 7 washers, 6 screws, 1 nut , 1 aluminium spacer, 6 drive lugs for spacer, 6 washers, 6 nuts, 6 screws and 6 washers for spacer
It means 51 parts

The "Extended Hub" solution allows to reduce of 61% the number of parts necessary for the propeller's assembly.

 

 

ISS E-Props

hub with integrated spacer 120 mm (for Savannah, for example)

and on the right with a 250 mm spacer

 

 

 

6 - A RELIABLE and DURABLE SYSTEM

 

 

The E-PROPS hubs, standard or extended, are extremely strong.

Material : 100% carbon + epoxy resin high T°

Injection with RTM process (Resin Transfer Molding)

Compact hub for minimum drag and to optimize engine's cooling

No life limitation. Recommended major periodic inspection : 2.000 hrs

 

 

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EXTENDED HUB MEASURE =>

 

 

To order, please indicate only 1 measure

Se = spacer extension

Please note : the E-PROPS standard hub is placing the spinner at -5mm to the edge of the engine cover

 

integrated spacer and spinnermesure longueur espaceur

 

 

 

PLEASE NOTE :

 

NEVER cut an E-PROPS extended hub.

The extended hubs are designed and manufactured for a defined length.

Cut them is similar to destroy the mechanical strength of the hub. This would be very dangereous.

It is absolutely FORBIDDEN to fly with an E-PROPS extended hub which would have been cutted.

There is no risk to do this by accident : it would be very noticeable that a hub has been cutted. If the hub is cutted, it is destroyed.

If you have no the good length, please contact us and we will send the hub you want.

 

 

 

E-PROPS ISS on AIRCRAFT

extended hub on a ROTAX's reducer with a spinner

 

 

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