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NG-D: adjustable pitch propellers
E-PROPS DETAILS
E-PROPS PROPELLERS Company
ZI Aviation
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 NG-D range : carbon propellers, ground adjustable pitch


The NG-D solution is interesting for engines or PPG manufacturers (to make tests), to develop prototypes, and also for some champions (to adjust the pitch very finely).
This type of propellers are not suitable for standard paramotor use because the pitch has to be adjusted every time the propeller is reassembled.

A PLUG'n'FLY is more suitable for PPG standard use or to big series.
All diameters, numbers of blades, rotation senses and pitches exist in PLUG'n'FLY models.
NG-D propellers are therefore reserved for special uses.


✗  NG-D = HI-TECH carbone propellers, ground adjustable pitch
✗  Very light : less than 750 gr for a 2-blade propeller diameter 125 cm
✗  Very strong : blades full carbon braid, high fibers ratio, Helical Continuous Fibers, leading edge protection
✗  Hubs in wooden-resin or in carbon
✗  For gear drive engines and electric engines from 10 to 50 kW
✗  2-blade and 3-blade models (4-blade on special order)
✗  Diameters : from 115 cm to 160 cm, each 5 cm
✗  Exist in both rotation senses : CW and CCW
✗  ASTM F2506-13 certified
✗  Made in France since 2008
✗  E-PROPS production: 45000 blades / year
✗  Sold all over the world in more than 80 countries


NGD E-PROPS

NG-D TECHNICAL DATA

1- Blades
2- Full carbon hubs
3- Wooden-resin hubs
4- Drilling
5- Torque
6- Max RPM
7- Max power
8- Assembly / NG-D Manual

1- Blades


E-PROPS NG-D have full carbon blades.

NGD E-PROPS

Optimum use of carbon fibers braid and epoxy resin to obtain ultra-light and very strong blades.
The HCF (Helical Continuous Fibers) process, specifically designed by E-PROPS, ensures an exceptional strength of the carbon braid (like a sock) + epoxy resin blade, from leading edge to trailing edge, from blade's foot to tip.
Manufacturing process : Resin Transfer Molding (RTM).
Foam core (D-Box).
UV High Resistance epoxy resin
Very high carbon fiber ratio : 63%
See page MANUFACTURING

NG-D propellers equip many engines :
- in 2-blade, 2-blade (4-blade on specia order)
- tractor and pusher configurations
- diameters : each 5 cm, from 115 to 160 cm
- CW and CCW : rotation senses indicated propeller seen in the wind made by the propeller (ClockWise = right / CounterClockWise = left)

NG-D propellers are available here => see NG-D CATALOG PAGE


2- Full carbon hubs


For all engines up to 60 cv, rotation sense CW or CCW
At this day, this full carbon hub exists ONLY for 3-blade pusher NG-D propellers, drilling = 6M8d75
Carbon hub weight = 300 gr
Hub thickness = 75 mm
No centering hole on the engine side

NGD E-PROPS

NGD E-PROPS

NGD E-PROPS

Click on this link to see the DRAWING OF THE E-PROPS 3-BLADE CARBON HUB


3- Wooden-resin hubs


For all engines up to 60 cv, rotation sense CW or CCW
For 2-blade, 3-blade and 4-blade propellers, tractor or pusher
Hub weight = 350 gr
Hub thickness = 60 mm
Centering hole = 25 mm (on the engine side)

NGD E-PROPS

NGD E-PROPS


Material : densified wood + epoxy resin (the wood is there as a matrix).
This material has the same mechanical characteristics as some aluminium alloys, and weights 50% less that aluminium.
Mechanical strength = 277 MPa [against 280 MPa for aluminium ref 2017]. It is used for example to manufacture the insolators of the raiways, because it has a high resistance in strength, a high dimensional stability, a very strong resistance to products as oil or fuel, and also a very good weather resistance.
The hub in densified wood is as strong as a carbon one.
The E-PROPS company is using this material since 2008. Those type of hubs are manufactured on a E-PROPS CNC machining center.

=> The interest of this material against aluminium : as strong as aluminium and two time lighter, easy to manufacture, cheaper.


4- Drilling


Drilling patterns :
- pusher 2-blade : 4M6d60 / 4M8d63 / 6M6d50 / 6M6d56 / 6M6d60 / 6M8d75
- tractor 2-blade : 6M8d75
- pusher 3-blade (wooden-resin hubs / carbon hubs) : 6M8d75
- tractor 3-blade : 6M8d75

Explanations on drillings, see page HUBS DRILLINGS
Never put a rubber spacer between the reducer and the propeller; the screws would break.


5- Torque


The screws tightening must be done with a torque wrench; torque value depending on the screws :
Screws 6 mm = 8 N.m
Screws 8 mm = 16 N.m


6- RPM max


Max RPM (at propeller = = engine max RPM / reducer ratio) on combustion engines :
- diameters 115 to 130 cm : 3000 RPM
- diameters 135 to 145 cm : 2900 RPM
- diameters 150 to 160 cm : 2800 RPM
On electric motors : consult us


7- Max power


The power absorbed by the propeller depends on each model and diameter :
2-blade models : up to about 40 hp for diameter 160 cm
2-blade and 4-blade models : up to about 60 hp for diameter 160 cm

NG-D 2-blade :
NGD 2-blade E-PROPS

NG-D 3-blade :
NGD 3-blade E-PROPS


NG-D are adapted only on engines with gear box : never use a NG-D propeller on a combustion direct drive engine (without gearbox).
They however can be adapted on direct drive electric engines. Contact our team.


8- Assembly


[a] Get both blades, both parts of the hub and screws together. Wooden-resin hub : the material of the hub is very dense and does not require any plate. Medium washers are included in the kit to put under the screws' heads.
[b] Put the blades in the hub, and the whole propeller on the reducer's flange.
[c] Close the hub and make a first very slow torque of the screws.
[d] Adjust the pitch.
[e] Torque the screws as mentionned in the manual.

If you have vibrations, the problem is certainly coming from the pitch adjustment. Please do it again carefully.

The E-PROPS are very well balanced in the assembly line. See BALANCING.

Find the Manuals here : MANUALS & DOCUMENTATIONS


NGD E-PROPS


NGD E-PROPS



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