Comparative tests between propeller DUC - Helices E

Comparative tests between propeller DUC - Helices E

COMPARATIVE EVALUATION between PROPELLERS
DUC FLASH / E-PROPS DURANDAL XL
Session 1
Tests made the 9th of August on Sisteron's airfield (LFNS)
Aircraft : G1 ultralight
Engine : ROTAX 912 S reducer ratio 1:2,43
Brand
DUC HELICES
HELICES E-PROPS
Model
FLASH
DURANDAL XL
3
3
Blades #
Diameter
1,90 m
1,90 m
inox Inconel
Nanostrenght® resin
Comparison
FLASH
DURANDAL XL
value
%
Propeller's weight
4,6 kg
2,9 kg
1,7 kg
37 %
Usefull static thrust [a]
200 kg
214 kg
14 kg
Leading edge protection
Take-off distance gain
Ø mini of the spinner
GAIN
7%
11%
280 mm [b]
150 mm [c]
[a] static thrust measured on the aircraft @ 5.400 RPM, then calculated at standard atmosphere 0m
altitude. In these conditions, the aircraft's drag in the propeller slipstream represents 40 kg.
[b] it means new engine hoods for many aircraft
[c] diameter compatible with all existing engine hoods
This technical comparison has been established between the DUC FLASH propeller and the E-PROPS
DURANDAL XL.
Results :
- usefull thrust : 14 kg more for the DURANDAL XL compare to the FLASH. The take-off distance of the
G1 decreases of 11%
- DURANDAL XL is 1,7 kg lighter compare to the FLASH. All spinners can be installed with the
DURANDAL XL.
Interests :
Higher thrust = lower take-off distance and best rate of climb = more security
Essential for some flights : mountains, towing gliders
Lighter propeller : important for some aircraft and ultralights; allows to optimize centre of gravity
position
Hélices E-PROPS - www.e-props.fr
SARL ELECTRAVIA - SIRET : 508 086 626 00027 RCS Manosque - TVA : FR 47508086626
Aérodrome de Sisteron – 04200 VAUMEILH (France)
Phone : +33 (0) 4 92 34 00 00 - Email : [email protected]
ULM G1 912S with DUC FLASH
ULM G1 912S with E-PROPS DURANDAL XL
Hélices E-PROPS - www.e-props.fr
SARL ELECTRAVIA - SIRET : 508 086 626 00027 RCS Manosque - TVA : FR 47508086626
Aérodrome de Sisteron – 04200 VAUMEILH (France)
Phone : +33 (0) 4 92 34 00 00 - Email : [email protected]
COMPARATIVE EVALUATION between PROPELLERS
DUC FLASH / E-PROPS DURANDAL 100 - L
Session 2
This technical comparison has been established between the DUC FLASH propeller and the E-PROPS
DURANDAL XL.
Tests made the 4th of December on Sisteron's airfield (LFNS)
Aircraft : G1 ultralight
Engine : ROTAX 912 S reducer ratio 1:2,43
QNH : 1027
T° : 17°C
Brand
DUC HELICES
HELICES E-PROPS
Model
FLASH
DURANDAL 100 - L
Blades number
Diameter
Leading edge protection
Total weight
Pitch (a)
3
3
1,85 m
1,80 m
inox Inconel
resin Nanostrenght®
4,7 kg
2,8 kg
26°
18,5°
(a) Both propellers have their pitch adjusted to have the same static RPM
COMPARATIVE RPM AND MAX SPEED
Propellers
FLASH
RPM
DURANDAL 100 - L
Speed (km/h)
RPM
RPM
0
5 490
5 460
Take-off
100
5 310
5 220
Max in level flight
190
5 700
Max in level flight
195
Static
5 550
The better efficiency of the DURANDAL allows to obtain a maximum speed in level flight of 195 km/h, it
means 5 km/h more than with the FLASH.
This gain of 5 km/h = 2,6% of maximum speed, represents an efficiency 8% better for the DURANDAL
compare with the FLASH.
The "constant speed" effect of the DURANDAL allows to obtain 195 km/h with 150 RPM less than with
the FLASH at 190 km/h.
Hélices E-PROPS - www.e-props.fr
SARL ELECTRAVIA - SIRET : 508 086 626 00027 RCS Manosque - TVA : FR 47508086626
Aérodrome de Sisteron – 04200 VAUMEILH (France)
Phone : +33 (0) 4 92 34 00 00 - Email : [email protected]
CLIMB RATE COMPARATIVE
The climb rate has been obtained in recording the climb time full power between altitudes 3.500 ft and
4.500 ft with both propellers.
FLASH
DURANDAL 100 - L
Climb rate
RPM
ft/min
5 220
750
100 km/h
5 310
Climb rate
ft/min
722
120 km/h
5 370
732
5 250
769
140 km/h
5 430
556
5 310
667
Speed
RPM
The DURANDAL has a better climb rate than the FLASH on all the speed range. The most important
difference appears at 140 km/h climbing full power.
The Vz with the DURANDAL is 667 ft/min against 556 ft/min for the FLASH, it means a 20% better climb
rate.
The DURANDAL have a 20% better climb rate with minus 120 RPM than the FLASH.
Note : at this speed of 140 km/h, the FLASH needs 120 RPM more than the DURANDAL. An aircraft with
a DURANDAL needs less fuel than with a FLASH : about 0,5 liter/hour at max speed.
Hélices E-PROPS - www.e-props.fr
SARL ELECTRAVIA - SIRET : 508 086 626 00027 RCS Manosque - TVA : FR 47508086626
Aérodrome de Sisteron – 04200 VAUMEILH (France)
Phone : +33 (0) 4 92 34 00 00 - Email : [email protected]
In conclusion :
On the G1 ultralight, the 8% better efficiency of the DURANDAL allows to obtain a maximum speed in
level flight of 195 km/h : it means 5 km/h more than with the FLASH.
The "constant speed" effect of the DURANDAL allows to obtain 195 km/h with 150 RPM less than with
the FLASH at 190 km/h.
The DURANDAL propeller has better performances than the FLASH propeller on all the speed range :
climb rate, max speed, fuel consumption. After 120 km/h, the difference becomes more important
between both propellers in favour of DURANDAL, because the efficiency of the FLASH collapses.
The DURANDAL has a 20% better climb rate than the FLASH. That's important for security and also to
reduce noise.
An aircraft with a DURANDAL needs less fuel than with a FLASH : about 0,5 liter/hour at max speed.
The DURANDAL is 40% lighter than the FLASH.
Hélices E-PROPS - www.e-props.fr
SARL ELECTRAVIA - SIRET : 508 086 626 00027 RCS Manosque - TVA : FR 47508086626
Aérodrome de Sisteron – 04200 VAUMEILH (France)
Phone : +33 (0) 4 92 34 00 00 - Email : [email protected]
ULM G1 ROTAX 912S with
DUC FLASH propeller
ULM G1 ROTAX 912S with
E-PROPS DURANDAL 100 – L propeller
Propeller E-PROPS DURANDAL 100 – L :
- 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 a DUC FLASH propeller
Hélices E-PROPS - www.e-props.fr
SARL ELECTRAVIA - SIRET : 508 086 626 00027 RCS Manosque - TVA : FR 47508086626
Aérodrome de Sisteron – 04200 VAUMEILH (France)
Phone : +33 (0) 4 92 34 00 00 - Email : [email protected]