ASCALON
Carbon-Titanium, ground-adjustable, for tractor-configuration
Designed for direct-drive Lycoming & Continental engines.
Experimental/LSA now, EASA/FAA certified soon.
2- and 3-blade propellers for Lycoming & Continental
ASCALON is a range of 2- and 3-blade ground-adjustable propellers, 100% Carbon with Titanium leading-edge protection, for tractor-configuration (clockwise)
direct-drive engines from 100 to 270 hp
✗ 4-cylinder Continental O-200/O-240/IO-240 and Lycoming O-235/O-290/O-320/O-360/IO-360/IO-390 up to 210 hp
✗ 6-cylinder Continental C145/O-300/O-360/O-470/IO-470 and Lycoming O-540/IO-540 up to 270 hp.
- Diameters
- 140–210 cm / 55–82.7 in
- Weight
- 6 kg (2-blade) / 7 kg (3-blade)
- Bolt Patterns
- 4" (Rotax 9xx-style), SAE1, SAE2 AN6/AN8
- Max RPM
- 3,300 rpm
- Moment of Inertia
- 6,000 kg·cm² (190 cm model)
- Inspection Interval
- 2,500 hours, unlimited service life
VHR (Very High Resistance) Carbon, high fiber ratio, RTM manufacturing — no aluminum hub components under cyclic load, eliminating the cracking and galvanic-corrosion risk of metal hubs.
Real operating conditions (not theoretical figures)
Compared to a 2-blade wooden propeller, at maximum weight and in hot weather conditions.
| % Gain | ASCALON 3-blade tested on Pena Bilouis (O-360, 180 hp) |
ASCALON 2-blade tested on Jodel DR1054 (O-320, 150 hp) |
|---|---|---|
| Takeoff roll & 15 m obstacle clearance | − 25 % | − 20 % |
| Rate of climb | + 20 % | + 15 % |
| Cruise speed | + 6 % | + 7 % |
| Fuel consumption at equal speed | − 7 % | − 8 % |
| Noise level | − 4 dB(A) | − 6 dB(A) |
Strong thrust at every RPM
ASCALON's blade profile and ground-adjustable pitch are engineered to keep engine RPM — and thrust — high across the whole flight envelope, from static to cruise, instead of the large RPM drop typical of standard fixed-pitch propellers. E-Props calls this the ESR effect (Extended Speed Range): narrow-chord, purpose-designed profiles avoid blade stall, so the propeller keeps delivering strong thrust exactly where it matters most for takeoff performance — in the 40–80 km/h range during the ground roll. What actually gets an aircraft off the ground is thrust, not engine RPM, and it's a differentiator few fixed-pitch propellers on the market can claim.
Download the ESR Effect Factsheet (PDF)
Right : Jodel DR1054 — Lycoming O-320, 150 hp, ASCALON 3-blade
Custom ELIAS Analysis
Currently, every ASCALON propeller is delivered with an ELIAS system that identifies the vibration ranges for each engine, ensuring that your ASCALON propeller will be perfectly matched to your engine.
See Design & Tests →
Bird-Strike Tested
The ASCALON blades successfully passed the bird strike resistance tests conducted on E-Props’ “Chicken Cannon” without sustaining any damage—this result is part of the evidence required for the Type Certificate application with EASA (CS-P) and the FAA (14 CFR Part 35)
See our test aircraft & rigs →Where ASCALON stands today
ASTM F2506-13 — the range complies today, with a TBO of 2,500 hours.
EASA CS-P Type Certificate — application file in progress with EASA; compliance testing to the standard under way at E-Props.
FAA 14 CFR Part 35 — to follow once the EASA Type Certificate is obtained.
Supplemental Type Certificates (STC) — obtained once the EASA/FAA Type Certificate is in hand, tested individually for each aircraft–engine–propeller combination.
Certification status shown here applies specifically to the ASCALON direct-drive range.
Spinners & spacers
What's shipping today, engine by engine
The ASCALON program is rolling out progressively across the 100–270 hp direct-drive range.
Lycoming O-360 & O-320 — 74" and 76" diameters, 2- and 3-blade.
Continental O-200 & Lycoming O-235 — 72" and 74" diameters. Bench testing complete; flight testing under way.
As a rule of thumb: 2-blade propellers have a high ESR effect and suit faster-cruising aircraft; 3-blade propellers have a lower ESR effect and are recommended for STOL & glider-towing aircraft.
Contact us for guidance on your specific aircraft and engine.