E-PROPS propellers for Aircraft / Ultralights: Data Sheet
E-PROPS GROUND ADJUSTABLE PITCH PROPELLERS DURANDAL & EXCALIBUR
DURANDAL & EXCALIBUR = a range of ground-adjustable pitch propellers: very strong, ultra-light, high-performance, reducing vibration and noise to a minimum. The TOP of ground adjustable propellers for ROTAX engines !!!
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✗ Hi-Tech ground adjustable pitch carbon propellers with Titanium leading edge protection
✗ The world's lightest propellers
✗ For gear-drive engines and electric motors, from 50 to 115 kW (68 to 156 hp) (perfect for Rotax engines)
✗ Available in 18 different diameters: from 120 to 205 cm
✗ Each model available in 2, 3, 4, and 5 blades
✗ Exist in both senses of rotation: CW (DURANDAL) and CCW (EXCALIBUR)
✗ Tractor and pusher configurations; different chord widths and blade profiles
✗ Certification ASTM F2506-13 (for some models), TBO 2000 or 4000 hours
01- E-PROPS range for Aircraft (LSA) / Ultralights
02- Design
03- The world's lightest propellers
04- Blades
05- Carbon Spacers
06- Spinners
07- Finish
08- Nanostrength or Titanium leading edge protection
09- Moment of Inertia
10- Balancing
11- Quality / Certification / TBO
12- Repairs / Spare Blades
13- Mechanical Strength / Load Tests
14- Tightening torque
15- Max Power & RPM
16- Maintenance
17- CAD files (stp)
18- Manuals
At E-PROPS, our team does not propose a "universal blade" that does everything, that can be cut at will, and that is therefore not always well adapted to the mission of the aircraft ...
Each E-PROPS is designed and developed for :
- the characteristics of the motor in question and its gearbox (if applicable)
- the study of engine cooling and air flow in the engine
- a defined aircraft speed range
- the aircraft configuration: tractor, pusher, high wings, low wings, and wings/fuselage interactions
- the use of the aircraft: speed, cruise, towing, STOL... and the desired performances
E-PROPS has developed numerous blade models, with several chords widths and several profiles, in both tractive and propulsive configurations.
Each model is available in 2, 3, 4 or 5 blades, in 18 different diameters (from 120 to 205 cm).
Range DURANDAL: CW sense
✗ 2-pale : Data Sheet DURANDAL-2
✗ 3-pale : Data Sheet DURANDAL-3
✗ 4-pale : Data Sheet DURANDAL-4
✗ 5-pale : Data Sheet DURANDAL-5
Range EXCALIBUR: CCW sense
✗ 2-pale : Data Sheet EXCALIBUR-2
✗ 3-pale : Data Sheet EXCALIBUR-3
✗ 4-pale : Data Sheet EXCALIBUR-4
✗ 5-pale : Data Sheet EXCALIBUR-5
Propellers "of 3rd generation" : efficient, ultra-light, quiet and very strong.
Made in France since 2008 : see page E-PROPS company.
The secret of their exceptional performances ?
- Extensive research of the E-PROPS design department, with many tests campaigns on wind tunnel, the development of an exceptional software called (LUKY) and many tests mechanical campaigns (example => VIDEO : E-PROPS test campaign V20 range (April 2020)
- A manufacturing process which allows a very lightweight
- Specific E-PROPS designs with high CL profiles. E-PROPS propellers design, see page DESIGN
- Propellers with high ESR effect : ground adjustable pitch propellers which behaviour is very near from the behaviour of a variable pitch propeller.
E-PROPS are by far the lightest propellers in the world.
A few weighs, including screws and bolts :
- 3-blade tractor DURANDAL-3 dia 170 cm Titanium leading edge protection for Rotax 912S (100 hp) : 2 kg
- 2-blade tractor DURANDAL-2 dia 175 cm Titanium leading edge protectionfor Rotax 912 (80 hp) : 1.6 kg
- 5-blade pusher EXCALIBUR-5 dia 172 cm Titanium leading edge protection for Rotax 914 (115 hp) : 3.2 kg
To understand the advantages of a lightweight propeller, click here : ULTRA-LIGHT PROPELLERS
The E-PROPS are fully made in carbon.
Optimum use of carbon fibers braid and epoxy resin to obtain ultra-light and very strong blades.
HCF system (Helical Continuous Fibers : Fibres Continues Hélicoïdales), specifically designed by E-PROPS.
Very high fibers ratio : 63%
Carbon fiber rolled up on a titanium ring, for an exceptional strength.
No risk of galvanic corrosion because no metal part.
See the page E-PROPS MANUFACTURING
E-PROPS has developed an exclusive system to replace the usual aluminium spacers : THE CARBON SPACERS.
Advantages :
✗ The E-PROPS spacers are ultra-light (13 times lighter than an aluminum spacer).
✗ The "E-PROPS spacer" option is free of charge, regardless of the chosen length.
✗ E-PROPS spacers are extremely easy to install (no unnecessary screws and bolts, thus avoiding vibrations).
✗ Orders are facilitated by the interactive drawings published by E-PROPS.
More information here : CARBON SPACERS
The E-PROPS spinners are in carbon, very strong and ultra-light.
The spinners of the V20 propellers range are proposed in 15 different diameters, from 210 to 380 mm.
See here : E-PROPS SPINNERS
Finish with shiny polish.
The carbon braid remains visible; each blade is unique.
No paint, varnish or gel-coat, because those products are very polluting.
The E-PROPS company is committed in an eco-management approach and proscribes this type of products.
In addition, paints, varnish and gel-coat do not allow to easily repair the blades in case of impact.
Only the spinners can be painted.
The E-PROPS V20 range are all equipped with 5/10th thick Titanium leading edge protection.
TITANE is the ideal material for blade leading edge protection thanks to its mechanical characteristics :
- the specific resistance of Titanium, which outperforms Aluminium and Steel.
- Coefficients of expansion and elasticity of Titanium close to the carbon-epoxy composite (material of the E-PROPS blades)
- Titanium's exceptional resistance to corrosion (especially in marine atmospheres)
- Titanium is twice as light as Steel or Inconel.
All other E-PROPS propellers have an internal shielding in the blades : injection at the leading edge of a special resin with Nanostrength® additive shock.
In special cases (as seaplanes), it is strongly recommended to put an extra protection on the blades leading edge, in order to reinforce it, with a polyurethane protection tape used on certified helicopter rotor blades.
See here : BLADES LEADING EDGE PROTECTION
The E-PROPS, ultra-light, strictly respect the MOI limitations given the engines manufacturers.
Moment of inertia of each model calculated then verified on the tests bench.
See details here : MOMENT OF INERTIA
Moment of inertia is indicated on the Identification Sheet of each propeller (delivered with the prop).
The E-PROPS propellers are precisely balanced at workshop.
The team is using an electronic bench to balance the propellers, with oscilloscopes.
More information here : BALANCING
E-PROPS propellers are designed, manufactured and tested to meet strict aeronautical standards.
They are certified following ASTM F2506-13 (LSA) standard.
Some of them are EASA certified.
The material of our propellers, carbon braid according to HCF process (Helical Continuous Fibers) + epoxy resin, without parts in other materials, is anisotropic.
A major inspection (TBO) is recommended, but not required. This inspection and overhaul can be performed by an E-PROPS approved workshop, following an E-PROPS procedure.
See all TBO here : TBO
Quality and safety are ongoing concerns for the E-PROPS company, throughout the design, procurement, manufacturing, testing and marketing of all its products.
More information on CERTIFICATIONS
Small impacts can be easily repaired (epoxy resin without paint, varnish or gel-coat).
A repair kit is available in this e-shop.
See details here REPAIRS
On the V20 range, the Titanium leading edge protection can be changed if it is damaged: it is not necessary to change the whole blade.
By E-PROPS, it is also possible to change only one blade.
See explanations on the page : SPARE BLADES
E-PROPS is doing many tests on all the propellers models.
See here TESTS ON GROUND
Example => VIDEO : E-PROPS test campaign V20 range (April 2020)
Test campaign : E-PROPS propellers for Aircraft (LSA) & Ultralights, 2020 range. Tensile, bending and torsion tests.
Carbon parts as strong as the Rotax gearbox shaft !
The screws tightening must be done with a torque wrench
Torque value is indicated in the Manual given with each propeller.
It is very important to follow the value of each model exactly.
Power (Watt) = torque (N.m) x rotation speed (rad/s)
To calculate the max power of a propeller model, you need to know :
- the maximum torque absorbed by the blades and hub
- the maximum rotational speed of the propeller
Max torque DURANDAL / EXCALIBUR:
- 2-blade : 310 N.m
- 3-blade : 465 N.m
- 4-blade : 620 N.m
- 5-blade : 650 N.m
Rotation speed:
E-PROPS propellers are designed for the limitations of each engine.
The rotational speed of each propeller is indicated on the Identification Sheet supplied with each propeller.
Example: maximum rotation speed of E-PROPS models for ROTAX 9 series engines = 2,600 rpm (speed measured at the propeller = max engine speed / reduction ratio).
2600 rpm = 272.27 rad/s
Maximum power of DURANDAL & EXCALIBUR models on gear-drive engines:
- 2-blade : 115 hp (86 kW)
- 3-blade : 172 hp (128 kW)
- 4-blade : 230 hp (172 kW)
- 5-blade : 240 hp (179 kW)
Maintenance is simple :
- Before each flight: visual inspection of the propeller (particularly check the leading edge) and check the screws tightening.
- V20 range : every 100 hours of flight and/or every 6 months , check of the screws tightening.
- V20 range with Titanium screws : every 200 hours of flight and/or every 12 months , check of the screws tightening.
- EXCALIBUR-6 V12 model => every 25 hours of flight and/or every 3 months : check of the screws tightening.
Cleaning of a carbon propeller is made with a sponge, with some water with soap, or with a product for windows cleaning.
For obvious reasons of design confidentiality, the files of the blades below are not the exact blade shapes.
They are provided for marketing rendering on CAD of aircraft / engines fairings.
They should not be used for efficiency calculations.
DURANDAL / EXCALIBUR ground adjustable pitch models :
- Blade ref U310 (length 800 mm) : Blade U310 stp
- Blade ref U312 (length 875 mm) : Blade U312 stp
- Blade ref U314 (length 950 mm) : Blade U314 stp
- Blade ref U316 (length 1025 mm) : Blade U316 stp
Hubs (ground adjustable pitch range) :
- 2-blade Hub : HUB 2-blade stp
- 3-blade Hub : HUB 3-blade stp
- 4-blade Hub : HUB 4-blade stp
STP files of E-Props spinners and spacers (V20 range) are the exact shapes.
Spinners (see details on this page : E-PROPS SPINNERS) :
- diameter 210 mm : Spinner 210 stp
- diameter 220 mm : Spinner 220 stp
- diameter 230 mm : Spinner 230 stp
- diameter 240 mm : Spinner 240 stp
- diameter 250 mm : Spinner 250 stp
- diameter 260 mm : Spinner 260 stp
- diameter 270 mm : Spinner 270 stp
- diameter 280 mm : Spinner 280 stp
- diameter 290 mm : Spinner 290 stp
- diameter 300 mm : Spinner 300 stp
- diameter 310 mm : Spinner 310 stp
- diameter 320 mm : Spinner 320 stp
- diameter 340 mm : Spinner 340 stp
- diameter 360 mm : Spinner 360 stp
- diameter 380 mm : Spinner 380 stp
Spacers (see details on this page : ESU SPACERS) :
- E-PROPS ESU spacers : SPACER stp
=> SEE PAGE : MANUALS and DOCUMENTATIONS
✗ The world's lightest propellers
✗ For gear-drive engines and electric motors, from 50 to 115 kW (68 to 156 hp) (perfect for Rotax engines)
✗ Available in 18 different diameters: from 120 to 205 cm
✗ Each model available in 2, 3, 4, and 5 blades
✗ Exist in both senses of rotation: CW (DURANDAL) and CCW (EXCALIBUR)
✗ Tractor and pusher configurations; different chord widths and blade profiles
✗ Certification ASTM F2506-13 (for some models), TBO 2000 or 4000 hours
DATA SHEET
01- E-PROPS range for Aircraft (LSA) / Ultralights
02- Design
03- The world's lightest propellers
04- Blades
05- Carbon Spacers
06- Spinners
07- Finish
08- Nanostrength or Titanium leading edge protection
09- Moment of Inertia
10- Balancing
11- Quality / Certification / TBO
12- Repairs / Spare Blades
13- Mechanical Strength / Load Tests
14- Tightening torque
15- Max Power & RPM
16- Maintenance
17- CAD files (stp)
18- Manuals
01- E-PROPS range for Aircraft (LSA) / Ultralights
At E-PROPS, our team does not propose a "universal blade" that does everything, that can be cut at will, and that is therefore not always well adapted to the mission of the aircraft ...
Each E-PROPS is designed and developed for :
- the characteristics of the motor in question and its gearbox (if applicable)
- the study of engine cooling and air flow in the engine
- a defined aircraft speed range
- the aircraft configuration: tractor, pusher, high wings, low wings, and wings/fuselage interactions
- the use of the aircraft: speed, cruise, towing, STOL... and the desired performances
E-PROPS has developed numerous blade models, with several chords widths and several profiles, in both tractive and propulsive configurations.
Each model is available in 2, 3, 4 or 5 blades, in 18 different diameters (from 120 to 205 cm).
Range DURANDAL: CW sense
✗ 2-pale : Data Sheet DURANDAL-2
✗ 3-pale : Data Sheet DURANDAL-3
✗ 4-pale : Data Sheet DURANDAL-4
✗ 5-pale : Data Sheet DURANDAL-5
Range EXCALIBUR: CCW sense
✗ 2-pale : Data Sheet EXCALIBUR-2
✗ 3-pale : Data Sheet EXCALIBUR-3
✗ 4-pale : Data Sheet EXCALIBUR-4
✗ 5-pale : Data Sheet EXCALIBUR-5
02- Design
Propellers "of 3rd generation" : efficient, ultra-light, quiet and very strong.
Made in France since 2008 : see page E-PROPS company.
The secret of their exceptional performances ?
- Extensive research of the E-PROPS design department, with many tests campaigns on wind tunnel, the development of an exceptional software called (LUKY) and many tests mechanical campaigns (example => VIDEO : E-PROPS test campaign V20 range (April 2020)
- A manufacturing process which allows a very lightweight
- Specific E-PROPS designs with high CL profiles. E-PROPS propellers design, see page DESIGN
- Propellers with high ESR effect : ground adjustable pitch propellers which behaviour is very near from the behaviour of a variable pitch propeller.
03- The world's lightest propellers
E-PROPS are by far the lightest propellers in the world.
A few weighs, including screws and bolts :
- 3-blade tractor DURANDAL-3 dia 170 cm Titanium leading edge protection for Rotax 912S (100 hp) : 2 kg
- 2-blade tractor DURANDAL-2 dia 175 cm Titanium leading edge protectionfor Rotax 912 (80 hp) : 1.6 kg
- 5-blade pusher EXCALIBUR-5 dia 172 cm Titanium leading edge protection for Rotax 914 (115 hp) : 3.2 kg
To understand the advantages of a lightweight propeller, click here : ULTRA-LIGHT PROPELLERS
04- Blades
The E-PROPS are fully made in carbon.
Optimum use of carbon fibers braid and epoxy resin to obtain ultra-light and very strong blades.
HCF system (Helical Continuous Fibers : Fibres Continues Hélicoïdales), specifically designed by E-PROPS.
Very high fibers ratio : 63%
Carbon fiber rolled up on a titanium ring, for an exceptional strength.
No risk of galvanic corrosion because no metal part.
See the page E-PROPS MANUFACTURING
05- Carbon Spacers
E-PROPS has developed an exclusive system to replace the usual aluminium spacers : THE CARBON SPACERS.
Advantages :
✗ The E-PROPS spacers are ultra-light (13 times lighter than an aluminum spacer).
✗ The "E-PROPS spacer" option is free of charge, regardless of the chosen length.
✗ E-PROPS spacers are extremely easy to install (no unnecessary screws and bolts, thus avoiding vibrations).
✗ Orders are facilitated by the interactive drawings published by E-PROPS.
More information here : CARBON SPACERS
06- Spinners
The E-PROPS spinners are in carbon, very strong and ultra-light.
The spinners of the V20 propellers range are proposed in 15 different diameters, from 210 to 380 mm.
See here : E-PROPS SPINNERS
07- Finish
Finish with shiny polish.
The carbon braid remains visible; each blade is unique.
No paint, varnish or gel-coat, because those products are very polluting.
The E-PROPS company is committed in an eco-management approach and proscribes this type of products.
In addition, paints, varnish and gel-coat do not allow to easily repair the blades in case of impact.
Only the spinners can be painted.
08- Nanostrength or Titanium leading edge protection
The E-PROPS V20 range are all equipped with 5/10th thick Titanium leading edge protection.
TITANE is the ideal material for blade leading edge protection thanks to its mechanical characteristics :
- the specific resistance of Titanium, which outperforms Aluminium and Steel.
- Coefficients of expansion and elasticity of Titanium close to the carbon-epoxy composite (material of the E-PROPS blades)
- Titanium's exceptional resistance to corrosion (especially in marine atmospheres)
- Titanium is twice as light as Steel or Inconel.
All other E-PROPS propellers have an internal shielding in the blades : injection at the leading edge of a special resin with Nanostrength® additive shock.
In special cases (as seaplanes), it is strongly recommended to put an extra protection on the blades leading edge, in order to reinforce it, with a polyurethane protection tape used on certified helicopter rotor blades.
See here : BLADES LEADING EDGE PROTECTION
09- Moment of Inertia
The E-PROPS, ultra-light, strictly respect the MOI limitations given the engines manufacturers.
Moment of inertia of each model calculated then verified on the tests bench.
See details here : MOMENT OF INERTIA
Moment of inertia is indicated on the Identification Sheet of each propeller (delivered with the prop).
10- Balancing
The E-PROPS propellers are precisely balanced at workshop.
The team is using an electronic bench to balance the propellers, with oscilloscopes.
More information here : BALANCING
11- Quality / Certification / TBO
E-PROPS propellers are designed, manufactured and tested to meet strict aeronautical standards.
They are certified following ASTM F2506-13 (LSA) standard.
Some of them are EASA certified.
The material of our propellers, carbon braid according to HCF process (Helical Continuous Fibers) + epoxy resin, without parts in other materials, is anisotropic.
A major inspection (TBO) is recommended, but not required. This inspection and overhaul can be performed by an E-PROPS approved workshop, following an E-PROPS procedure.
See all TBO here : TBO
Quality and safety are ongoing concerns for the E-PROPS company, throughout the design, procurement, manufacturing, testing and marketing of all its products.
More information on CERTIFICATIONS
12- Repairs / Spare Blade
Small impacts can be easily repaired (epoxy resin without paint, varnish or gel-coat).
A repair kit is available in this e-shop.
See details here REPAIRS
On the V20 range, the Titanium leading edge protection can be changed if it is damaged: it is not necessary to change the whole blade.
By E-PROPS, it is also possible to change only one blade.
See explanations on the page : SPARE BLADES
13- Mechanical Strength / Tests
E-PROPS is doing many tests on all the propellers models.
See here TESTS ON GROUND
Example => VIDEO : E-PROPS test campaign V20 range (April 2020)
Test campaign : E-PROPS propellers for Aircraft (LSA) & Ultralights, 2020 range. Tensile, bending and torsion tests.
Carbon parts as strong as the Rotax gearbox shaft !
14- Tightening torque
The screws tightening must be done with a torque wrench
Torque value is indicated in the Manual given with each propeller.
It is very important to follow the value of each model exactly.
15- Max Power & RPM
Power (Watt) = torque (N.m) x rotation speed (rad/s)
To calculate the max power of a propeller model, you need to know :
- the maximum torque absorbed by the blades and hub
- the maximum rotational speed of the propeller
Max torque DURANDAL / EXCALIBUR:
- 2-blade : 310 N.m
- 3-blade : 465 N.m
- 4-blade : 620 N.m
- 5-blade : 650 N.m
Rotation speed:
E-PROPS propellers are designed for the limitations of each engine.
The rotational speed of each propeller is indicated on the Identification Sheet supplied with each propeller.
Example: maximum rotation speed of E-PROPS models for ROTAX 9 series engines = 2,600 rpm (speed measured at the propeller = max engine speed / reduction ratio).
2600 rpm = 272.27 rad/s
Maximum power of DURANDAL & EXCALIBUR models on gear-drive engines:
- 2-blade : 115 hp (86 kW)
- 3-blade : 172 hp (128 kW)
- 4-blade : 230 hp (172 kW)
- 5-blade : 240 hp (179 kW)
16- Maintenance
Maintenance is simple :
- Before each flight: visual inspection of the propeller (particularly check the leading edge) and check the screws tightening.
- V20 range : every 100 hours of flight and/or every 6 months , check of the screws tightening.
- V20 range with Titanium screws : every 200 hours of flight and/or every 12 months , check of the screws tightening.
- EXCALIBUR-6 V12 model => every 25 hours of flight and/or every 3 months : check of the screws tightening.
Cleaning of a carbon propeller is made with a sponge, with some water with soap, or with a product for windows cleaning.
17- CAD files (stp)
For obvious reasons of design confidentiality, the files of the blades below are not the exact blade shapes.
They are provided for marketing rendering on CAD of aircraft / engines fairings.
They should not be used for efficiency calculations.
DURANDAL / EXCALIBUR ground adjustable pitch models :
- Blade ref U310 (length 800 mm) : Blade U310 stp
- Blade ref U312 (length 875 mm) : Blade U312 stp
- Blade ref U314 (length 950 mm) : Blade U314 stp
- Blade ref U316 (length 1025 mm) : Blade U316 stp
Hubs (ground adjustable pitch range) :
- 2-blade Hub : HUB 2-blade stp
- 3-blade Hub : HUB 3-blade stp
- 4-blade Hub : HUB 4-blade stp
STP files of E-Props spinners and spacers (V20 range) are the exact shapes.
Spinners (see details on this page : E-PROPS SPINNERS) :
- diameter 210 mm : Spinner 210 stp
- diameter 220 mm : Spinner 220 stp
- diameter 230 mm : Spinner 230 stp
- diameter 240 mm : Spinner 240 stp
- diameter 250 mm : Spinner 250 stp
- diameter 260 mm : Spinner 260 stp
- diameter 270 mm : Spinner 270 stp
- diameter 280 mm : Spinner 280 stp
- diameter 290 mm : Spinner 290 stp
- diameter 300 mm : Spinner 300 stp
- diameter 310 mm : Spinner 310 stp
- diameter 320 mm : Spinner 320 stp
- diameter 340 mm : Spinner 340 stp
- diameter 360 mm : Spinner 360 stp
- diameter 380 mm : Spinner 380 stp
Spacers (see details on this page : ESU SPACERS) :
- E-PROPS ESU spacers : SPACER stp
18- Manuals
=> SEE PAGE : MANUALS and DOCUMENTATIONS
