M120H datasheet

Hybrid-ready. 25 kW where the alternator used to be.

DRY MASS 71.8 KGGEN OUTPUT 25 KWASSIST +33 HP / 90 STAXI ENGINE-OFF

Document: DS-M120H-2026
Revision: C
Issued: 2026-07-01
Sheets: 1 of 1

M120H hybrid-ready flat-four with the axial-flux starter-generator ring between the core and the reduction drive — General arrangement

Type dataM120H · 2026

Configuration: Flat-four + axial-flux motor-generator
Displacement: 1,340 cc
Max power (combined): 120 hp + 33 hp electric assist (90 s)
Generator output: 25 kW continuous @ 5,500 rpm
Electric taxi: Yes — engine-off, 8 kt on paved surface
Reduction drive: 2.43 : 1 helical, shared case
Dry mass: 71.8 kg (less battery)
TBO: 2,000 h core / 4,000 h MG inspection
Fuel: 91E10 mogas / UL91 / 100LL
DC bus: 540 V nominal, isolated HV harness
Ignition & injection: Dual-channel FADEC + MG inverter cross-link
Propeller flange: SAE-1

Combined power and torque, measured on the cellCELL DATA

Combined powerCombined torque

Installation envelopeFWF

CommercialEX-WORKS FILTON

Firewall-forward price: $31,900
Deposit to hold a build slot: $2,500 (refundable)
Warranty: 3 yr / 1,000 h, whichever comes later
Documentation: Free — manuals, ICD, parts catalog

Martlet Aero Ltd, Filton, Bristol. Specifications subject to service-letter revision; data taken from published test-cell records.

Configure & order Back to the M120H

Close on the crankcase top deck: the riveted identification plate reading M160T, serial and works — Parting line