E-PROPS ASCALON & CLARENT: Carbon-Titanium Propellers for Direct-Drive Engines
ASCALON (tractor, clockwise CW) and CLARENT (pusher, counter-clockwise CCW) make up the E-Props ground-adjustable pitch range for direct-drive Lycoming and Continental engines, from 100 to 270 hp: very strong, lightweight, high-performance, minimizing vibration and noise. ASCALON is the first operational range: technological innovation driving performance and reliability.
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This page details nine parts, to expand below: ASCALON's description and specifications, its accessories, measured real-world performance, noise reduction achieved, certifications, data sheets, pricing, a bird-strike test — and finally the CLARENT range (CCW pusher version), still under development.
OFFICIAL LAUNCH OF THE ASCALON RANGE: February 20, 2026
1 — ASCALON: Descriptionspecifications, compatible engines, diameters, weights, certification in progress.
✗ 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-290, 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
✗ Diameters: from 140 cm to 210 cm
✗ 2-blade weight = 6 kg / 3-blade weight = 7 kg
✗ Drilling patterns = 4" (like Rotax 9xx), SAE1, SAE2 AN6, SAE2 AN8
✗ Max RPM = 3,300
✗ Moment of Inertia: 6000 kg.cm² (190 cm diameter models) — same as wooden propellers for these same engines
✗ Unlimited service life / 2,500 hours inspection interval
✗ Propellers in VHR Carbon (Very High Resistance) with Titanium leading edge protection
✗ Very strong: 100% carbon, very high fiber ratio, RTM manufacturing process
✗ No critical cyclic stresses on aluminum components, eliminating the risk of cracking and galvanic corrosion
✗ Currently undergoing certification by EASA (and subsequently by the FAA)
2 — Accessoriesspinners, integrated spacers.
Carbon spinners: diameters from 300 mm to 380 mm. Integrated carbon spacers: lengths from -15 mm to 230 mm, every 5 mm.
3 — Measured performance in real operating conditionsmeasured gains vs. wooden propeller, ESR effect.
| Comparison vs 2-blade wooden propeller (max weight, hot weather) | ASCALON 3-blade Pena Bilouis (O-360, 180 hp, aerobatic) | ASCALON 2-blade Jodel DR1054 (O-320, 150 hp, with muffler) |
|---|---|---|
| Take-off roll and 15 m obstacle clearance | − 25 % | − 20 % |
| Rate of climb | + 20 % | + 15 % |
| Cruise speed | + 6 % | + 7 % |
| Fuel consumption | − 7 % at equal speed | − 8 % at equal speed |
| Noise level | − 4 dB(A) | − 6 dB(A) |
Thanks to their ESR effect (Extended Speed Range), ASCALON propellers deliver strong thrust at all engine RPM.
4 — Noise reductioncomparative measurements with exhaust muffler.
Initial noise measurements show promising results: a 6 dB(A) reduction was measured comparing ASCALON to a standard propeller on an aircraft fitted with an exhaust muffler.
5 — CertificationsASTM F2506-26, EASA CS-P in progress, FAA to follow.
The ASCALON range complies with ASTM F2506-26, 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 and is currently being reviewed, with 7 engineers from the E-Props design office working on it to move forward as quickly as possible. Once the EASA TC is obtained, E-Props will apply for FAA 14 CFR Part 35 certification. Tests will then also be needed for the STCs (Supplemental Type Certificates) for each aircraft-engine-propeller combination.
See the E-Props certifications page.
7 — Pricing and market releasepricing, availability by engine.
February 1st, 2026: the ASCALON range is on the market! The first models, available in 2- and 3-blade versions, are offered for Lycoming O-360 engines: ASCALON 2-blade — €3,500, ASCALON 3-blade — €4,500. Discover them here: ASCALON catalog. Many other models for all configurations will be available soon.
September 2026 update: new models are now available, in addition to the Lycoming O-320 and O-360 models — an ASCALON range for Continental O-200 and Lycoming O-235 engines. The ASCALON 2-blade propeller, 72-inch (183 cm) diameter, has completed its ground-test campaign on a Jodel DR-1050 MV fitted with a Continental O-200, instrumented with our ELIAS data-acquisition system (vibration, blade-root loads, thrust, torque, RPM, pressures, temperatures).
8 — Bird strike on ASCALON bladechicken-gun impact test.
In this video, we take you behind the scenes of one of our most spectacular tests: the bird-strike impact test, performed on an ASCALON propeller blade using our own chicken gun — a very rare capability in the propeller industry!
ASCALON blade is extremely strong: bird strike test
9 — CLARENT: the pusher versionpusher propellers for Lycoming/Continental, under development.
CLARENT is the pusher (counter-clockwise, CCW) variant of the ASCALON range, for aircraft in pusher configuration — for example aircraft from the RUTAN family (VariEze, LongEze, Cozy...). It shares the same technical foundations as ASCALON: 2- and 3-blade ground-adjustable pitch propellers, carbon with Titanium leading edge protection, innovative blade airfoils, for Lycoming & Continental engines from 100 to 270 hp (same engine range, diameters from 140 to 210 cm, weights of 6 and 7 kg, SAE1 & SAE2 bolt patterns, max RPM 3,300, moment of inertia 6000 kg.cm² at 190 cm diameter — same as wooden propellers for these same engines). Accessories: carbon spinners (300 to 380 mm) and integrated carbon spacers (-15 to 230 mm, every 5 mm).
These propellers, dedicated to Lycoming and Continental engines in pusher configuration, are currently undergoing a specific development by our team: we pay special attention to the design and mechanical strength calculations, ahead of manufacturing dedicated molds and tooling, followed by the essential testing needed to fully validate these new propellers in real operating conditions.
