Products / Hirth Engines / 41 Series
hirth engines logo.webp

Cutting-Edge Two-Stroke Gasoline & Heavy Fuel Engines for Unmanned Aerial Vehicles

Hirth Engines / 41 Series

41 Series

Air-cooled 8.1HP two-stroke engines with automatic altitude & temperature compensation

Socials
Discover the Exciting World of the 41 Series!

Introducing the Advanced 41 Series UAV Engine

Engineered from a time-tested design that has successfully completed over 20,000 missions in challenging conditions, the air-cooled 41 Series represents the forefront of two-stroke UAV engine innovation. This engine incorporates refined closed-loop control systems along with automatic altitude and temperature adjustments, providing an remarkable output of up to 8.1 HP at 6700 rpm. It guarantees exceptional reliability and performance, even in the most demanding environments.

Versatile Engine Options

The 41 series engines come with a range of customizable features, including a starter/generator capable of producing up to 1kW, multiple exhaust configurations, and an integrated oil injection system for enhanced efficiency.

Technical Specifications

Dimensions (L x W x H): 259 x 286 x 308 mm (10.2 x 11.25 x 12.12”)
Weight: 3400g (7.5 lb) including exhaust system,sensors,and wiring harness
600g (1.33 lb) for additional components (ECU, ignition system, fuel supply, etc.)
Displacement: 100 cm³ (6.3 cu in)
Stroke: 34 mm (1.34 in)
Bore: 44 mm (1.73 in)
Maximum Output: 6 kW (8.1 HP) at 6700 rpm
Measured according to DIN 70020 standards

Other Products

Gasoline & heavy fuel air-cooled 15HP UAV engines with automatic altitude & temperature compensation
Gasoline or heavy fuel liquid-cooled UAV engines with 70HP output
Air-cooled 30HP two-stroke engines for smaller UAV platforms
Air-cooled 65HP two-stroke UAV engines with leading power-to-weight ratio
Air-cooled 50HP two-stroke engines for UAVs of up to 120 kg