E-PROPS ASCALON CW : Carbon-Titanium Propellers for Direct-Drive Engines

ASCALON : GROUND ADJUSTABLE PITCH PROPELLERS

Multi-objective optimization for high aerodynamic efficiency, minimal weight, superior strength and noise reduction

✗  Range of 2- & 3-blade propellers, ground adjustable pitch, Carbon with Titanium leading edge protection
✗  For tractor aircraft, rotation sense clockwise (CW)
✗  Innovative blade profiles

✗  For direct-drive engines Lycoming & Continental from 100 to 270 hp:
- 4 cylinders : up to 210 hp
Continental O-200 O-240 IO-240
Lycoming O-235 O-320 O-360 IO-360 IO-390
- 6 cylinders : up to 270 hp
Continental C145 O-300 O-360 O-470 IO-470
Lycoming O-540 IO-540

Range of propellers for Lycoming and Continental =>
✗  Diameters : from 140 cm to 210 cm / 55 inch to 82.7 inch
✗  2-blade weight = 6 kg / 13.3 lb
✗  3-blade weight = 7 kg / 15.5 lb

✗  Drilling patterns = SAE1 & SAE2
✗  Max RPM = 3.300
✗  Moment of Inertia : 6000 kg.cm² (for models diameter 190 cm)
      Same Moment of Inertia as wooden propellers for the same engines

✗  Propellers in VHR Carbon [Very High Resistance = Très Haute Résistance] with Titanium leading edge protection
✗  Very strong : 100% carbon, very high fibers ratio, RTM Manufacturing
✗  No cyclic loading on aluminium components = no cracks

✗  Currently undergoing certification by EASA (and subsequently by the FAA)

✗  Carbon Spinners : diameters from 300 mm to 380 mm
✗  Integrated carbon spacers: lengths from 15 mm to 230 mm, every 5 mm

Download here : Installation & Maintenance Manual

Comparative data coming soon

Thanks to their ESR EFFECT (Extended Speed Range), ASCALON propellers have strong thrust at all engine RPM.

Initial noise measurements show promising results.
A noise reduction of 4 dB(A) was measured when comparing ASCALON to a standard propeller on an aircraft equipped with an exhaust silencer.

The ASCALON range complies with ASTM F2506-13, with a TBO of 2000 hours.
Work on EASA CS-P certification for this range is underway.
The TC (Type Certificate) application has been submitted to EASA.
It is currently being reviewed, and 7 engineers from the E-PROPS design office are working on this certification to move forward as quickly as possible.
Once the EASA TC has been obtained, E-PROPS will apply for FAA 14 CFR PART 35 certification.
Finally, tests must also be carried out for the STCs (Supplemental Type Certificates) for each aircraft-engine-propeller combination.

See page E-PROPS CERTIFICATIONS.

Click on the image to get the PDF file:

DATA SHEET ASCALON

February 1st, 2026: the ASCALON range is now on the market! The first models, available in 2- and 3-blade versions, are offered for Lycoming O-360 engines.
ASCALON 2-pale : 3500 €
ASCALON 3-pale : 4500 €
You can discover them here: ASCALON Catalog

Many other models for all configurations will be available soon.

This report presents an experimental study of torsional vibrations in a direct-drive Lycoming O-360 engine–propeller assembly. Vibratory torque measurements were performed during ground and flight tests on several propeller configurations (aluminium, wood, multi-blade carbon fiber and 3-blade carbon fiber). The results highlight significant differences in torsional resonance behavior, and demonstrate that an optimized propeller design can substantially reduce vibratory coupling.

Click here to view the full report:
=> Experimental Torsional Vibration Analysis of Different Propellers on a Lycoming O-360 Engine

The entire ASCALON propeller range for direct-drive Lycoming & Continental engines from 80 to 270 hp (4-cylinder engines up to 210 hp and 6-cylinder engines up to 270 hp) is currently under development and entering production.

The 2-blade and 3-blade models for the Lycoming O-360 engine are already available in 74-inch and 76-inch diameters.
See the CATALOG here: ASCALON for Lycoming O-360
For this engine and within these diameter ranges, we recommend:
- for higher-speed aircraft: 2-blade propellers
- for slower aircraft and STOL operations: 3-blade propellers

Molds for additional diameters, both smaller and larger, are currently being manufactured and will be available soon.

Regarding the Lycoming O-320, Continental O-200, and Lycoming O-235 engines, the 2-blade and 3-blade models are currently undergoing testing.
Bench tests have been completed, and we have recently acquired a Jodel DR1054 equipped with an O-320 engine in order to conduct flight testing.
These versions are expected to be available in approximately two months, initially in 72-inch and 74-inch diameters, followed by a gradual rollout of additional diameters.

=> E-Props’ objective is to offer the complete ASCALON range, with a wide choice of configurations, blade counts, and diameters.

Ascalon 2-blade full Carbon Titanium, diameter 193 cm, weight 6 kg, on PENA Bilouis Lycoming O-360 180 hp

ASCALON propeller for Lycoming O-360 180hp engine, side view, with ELIAS test data recording system

100% carbon hub: extremely high strength, no mix of materials and no cracks
Adapted profiles and strings: multi-objective optimization
100% carbon blades + titanium leading edge protection