E-PROPS GLORIEUSE : Range of In-Flight Variable Pitch Propellers for ROTAX serie 9xx

✗  3-blade propellers, in-flight variable pitch system (Constant Speed), the lightest on the market
✗  For tractor aircraft only (for pusher aircraft, under development)

✗  For gear-drive engines (on a Rotax 9xx base) up to 185 hp
✗  ROTAX  912   912S   912ULS   912iS   914   915iS   916iS  as well as conversions based on these engines (EDGE PERFORMANCE, EPA POWER...)
✗  For configuration 2 (electric and fixed pitch) AND configuration 3 (hydraulic).
✗  Work with other governors (MT-Propellers, JIHOSTROJ...) and other regulators (FLYBOX APR-1, RS FLIGHT SYSTEMS...)

✗  Versions and Diameters :
      - Blades C8 : Rotax 912 / 912S & iS / 914 / 915iS : from 160 to 190 cm (each 5 cm)  /  from 63" to 74,8" (each 2")
      - Blades C9 : Rotax 915iS & 916iS : 175 cm, 190 cm, 210 cm  /  68.9", 74.8", 82.7"

✗  Max RPM at propeller = 2.600 (for the 170 cm diameter model)
✗  Moment of inertia : 2.600 kg.cm² (for the 170 cm diameter model)

✗  Hydraulic actuator with electronic management : the robustness of the hydraulic actuator and the precision of the electronics
✗  No bearing = no jamming / No lubricant = no leakage
✗  Ultra-fast regulation: max pitch / min pitch in less than 3 seconds, without jerks or speed variations
✗  Safety stops min. pitch / max. pitch
✗  Pitch variation: max. range 16°

✗  Total weight: 3-blade propeller + governor + regulator + spinner = only 4 kg / 8,8 lb
✗  Carbon propellers with Titanium leading edge
✗  Very strong : 100% carbon, very high fibers ratio, RTM Manufacturing
✗  No cyclic loading on aluminium components = no cracks
✗  Compliant with ASTM F2506-26 / EASA CS-P certification in progress
✗  TBO = 2000 hrs

The design of the GLORIEUSE variable pitch propeller blade is very aesthetic, but above all it reduces the pitch control efforts. This allowed E-Props to realize a low pressure hydraulic control (2 bars), thus to lighten the whole control system, with a small cylinder.

Why different blades? Apart from the difference in engine power, a Rotax 912S has a 1:2.43 gearbox, while a Rotax 916iS has a 1:2.54 gearbox. The propeller therefore doesn't turn at the same rpm. The same blade couldn't have the same efficiency on both engines. To have a high-performance propeller, it has to be exactly matched to the engine, its gearbox and the ideal diameter for each aircraft. That's why E-PROPS offers a range of different blade models, declined (and not recut) in different diameters.

Reminder: Rotax engine configurations. Rotax S2 (Configuration 2) means that the propeller shaft in the gearbox is not configured for a Constant Speed hydraulic governor (large hole in the center for the 912, 912S and 914). This is the most common and slightly less expensive version of Rotax 4-stroke engines. Rotax S3 (Configuration 3) means that the gearbox is pre-equipped for mounting a hydraulic governor.

Possible solutions for Glorieuse propeller control:

For Rotax 912-912S-914 engines, configuration 2 (S2):
- Governor electro-hydraulic actuator E-Props + regulator E-Screen (electronic) => option recommended by E-Props
- Governor electro-hydraulic actuator E-Props + regulator FLYBOX APR-1 (electronic)

For Rotax engines 912-912S-914-915is-916is configuration 3 (S3):
- Governor electro-hydraulic actuator E-Props + regulator E-Screen (electronic) => option recommended by E-Props
- Governor electro-hydraulic actuator E-Props + regulator FLYBOX APR-1 (electronic)
- Governor hydraulic actuator MT-Propellers or JIHOSTROJ => 100% mechanical solution
Please note: RS Flight Systems and Flybox Innovative Avionics offer "Single Lever" solutions for hydraulic governors (please consult these companies). E-Props is working on a Single Lever system - coming soon.

For Rotax 915is-916is engines, configuration 2 (S2):
To date, there is no solution for this configuration, but it is easily possible to transform configuration 2 into 3.

Hydraulic actuator with electronic management. The robustness of the hydraulic actuator and the precision of the electronics. Two different systems according to the Rotax configuration:

E-SCREEN: specific instrument for Constant Speed propeller, designed and manufactured by E-PROPS, adapted for GLORIEUSE in-flight variable pitch propellers range. The best solution to control the propeller for a high reactivity.

RPM adjustment potentiometer, intake pressure. Diameter = 57 mm (2.24 inch). Weight = 70 g. Automatic over-torque and over-rpm protection. Setting via Bluetooth (see below). High readability screen.

Setting the E-SCREEN parameters

If you only want to change the pitch on the control panel, we also offer the POTENTIOMETER. It's the same system as the E-SCREEN, but without the display, which can be easier to integrate on some control panels.

The most frequent question concerns clearance in the blade root.

Why can a slight blade movement be felt on the ground?
A small blade root clearance is inherent to the design of all variable-pitch and in-flight adjustable propellers. During the first hours of operation (typically 10–20 hours), a slight evolution of this clearance may occur as part of the normal bedding-in of mechanical interfaces under operational loads.

Is this clearance within acceptable limits?
Yes. The blade root clearance on the E-Props Glorieuse propeller is fully compliant with its design and certification specifications and is not greater than that of comparable propellers on the market. All tolerances are clearly defined in the Maintenance Manual. Blades should be tight in the propeller hub, the play between the blades and the hub must not be bigger than 0.3mm. And the blade tip displacement must not be bigger than 13mm (wobble).

Why does the clearance seem more noticeable on the Glorieuse propeller?
The Glorieuse propeller is significantly lighter than many competing propellers. Its low mass and inertia make blade movement easier to perceive by hand at the blade tip when the aircraft is on the ground. This can give the impression of increased play, although the actual clearance remains unchanged and within specified limits.

Does this clearance affect safety, performance, or durability?
No. This blade root clearance has no negative impact on safety, performance, or service life. When operated and maintained in accordance with the Manual, it is stable and non-progressive beyond the initial bedding-in phase.

Could the observed movement come from the engine rather than the propeller?
Yes. Some engines equipped with a reduction gearbox exhibit a noticeable gearbox backlash. This backlash is a normal characteristic of the engine and must not be confused with blade movement within the propeller hub.

At E-Props, the design department and test pilots made many tests with a lot more clearance. After a couple of flight hours, when sleeves find their positions, the mechanical clearance is stabilized for hundreds of hours. Anyway, you can regularly check the torque on the M6 bolts.