Hirth Engines & Maintenance

With an earned reputation as market leaders who provide proven technologies and superior service, Hirth Engines GmbH offer innovative two-stroke propulsion with a long history of engineering excellence. Rely on the performance and efficiency built into every Hirth Engine, and on NWUAV’s commitment to ensuring your propulsion solution is reliable, cost-effective, and maintained. Talk to our team today about how Hirth Engines could be your two-stroke solution or contact us about maintenance options (NWUAV is an authorized Hirth Global Sales Distributor and maintenance facility serving North and Central America).

All Hirth Engines Feature:

Two-Stroke
Injection System
Innovative Design
Impeccable Service
Rigorous testing

Hirth Engine MRO: Maintenance, repairs, overhauls and even customized modifications. As an MRO organization Northwest UAV provides all levels of UAV engine MRO maintenance and repair. And as an authorized Hirth Global Sales Distributor and maintenance facility, Northwest UAV can also assist with Hirth Engine maintenance, repairs, and overhauls. At a fraction of the cost of new equipment, get your engines restored to their original levels of performance and efficiency. We'll work with you to establish inventory of all your major subassemblies to minimize lead time and reduce spare engine requirements. Tell us the repair you need and the budget you have to work with. We'll help you control cost and get your UAV engine.

8 HP Hirth 41 Series Engine / 4103

With optimized performance for extreme environmental conditions, this top-shelf propulsion system meets the demanding requirements of UAVs today. Based on the world-renowned 4103 engine, the new 41 Series features the latest in engine technology with the proven design of the 4103 engine, which has flown more than 20,000 missions in theatre across the globe. An air cooled, two-stroke engine, the 41 Series utilizes advanced closed-loop control and features automatic altitude and temperature compensation, allowing reliable start and operation in a wide operating range.

41 Series Key Features

Two-cylinder two-stroke (opposed)
8 hp (5.96 kW) at 6700 rpm according to DIN 70020
Air cooled
Exceptional reliability
Maximum performance in extreme conditions
Latest unmanned aerial vehicle (UAV) technology
Starter-generator-system
7.5 lb (3400 g) with exhaust system, sensors, and wiring harness
OPTIONS:
Two exhaust styles
500W starter/generator
Oil injection

For more information:
Hirth Engine Data Sheet

Hirth 41 Series Data Sheet

15 HP Hirth 42 Series Engine / 4201

The 42 Series offers optimized performance for extreme environmental conditions. An air cooled, two-stroke engine that utilizes advanced closed-loop control, the 42 Series features automatic altitude and temperature compensation allowing reliable start and operation in a wide operating range. Featuring the latest in engine technology, the 42 Series offers the UAV market a propulsion solution that meets the demanding environmental and mission requirements.

42 Series Key Features

Two-cylinder two-stroke (opposed)
15 hp (11 kW) at 6500 rpm according to DIN 70020
Air cooled
Starter-generator-system
State-of-the-art engine technology
Ultimate control in extreme conditions
Best performance for unmanned aerial vehicles (UAV)
12.5 lb (5700 g) with exhaust system, sensors, and wiring harness
OPTIONS:
Two exhaust styles
Up to 1kW starter/generator
Oil injection

For more information:
Hirth Engine Data Sheet

Hirth 42 Series Data Sheet

Hirth Sport Aviation Engine F33 AS | 33 Series

30 HP Hirth 33 Series Engine / F33 AS

For those in the 30-horsepower market, the 33 series offers the ultimate power-to-weight ratio. An air cooled two-stroke engine offering 1000 hours TBO at 75% power, the 33 Series is a great propulsion solution for use in light and ultralight aviation, powered parachutes, and other applications where weight is significant. NG version for UAV available.

33 Series Key Features

Single-cylinder two-stroke
30 hp (22.37 kW) at 6500 rpm (AS) according to DIN 70020
Air cooled
Lightweight
Best suited for light aviation and powered parachutes
28 lb (12.7 kg)
OPTIONS:
Dual ignition
50W generator power
Belt reduction G33 (1:1,8 / 1:2,2 / 1:2,5)
Electric starter (only in combination with G33)
Cylinder head Maximo

For more information:
Hirth 33 Series Data Sheet

Hirth 33 Series Data Sheet

Hirth Sport Aviation Engine F23 Lightweight | 23 Series

50 HP Hirth 23 Series Engine / F23 Lightweight

Setting world-class standards in its power-to-weight ratio, the 23 Series achieves unmatched performance and reliability. An air cooled, two-stroke engine offering 1000 hours TBO (time between overhaul), the 23 Series is a great choice for lightweight aviation vehicles, weight up to 120 kg.

23 Series Engine Key Features

Two-cylinder two-stroke (inline)
50 hp (36.7 kW) at 6500 rpm according to DIN 70020
Air cooled
World standard power-to-weight ratio
Fit to take on any challenge in light aviation
48.4 lb (22 kg) without exhaust
OPTIONS:
Dual ignition
Polyflex belt reduction G23 (1:1.8 / 1:2.0 / 1:2.5 / 1:3.1)
Electric starter
Exhaust system (according to Hirth technical information)

For more information:
Hirth Engine Data Sheet

Hirth 23 Series Data Sheet

60 HP Hirth 35 Series Engine / 35HF

Offering maximum power-to-weight ratio in the 70-horsepower market, the 35 Series is an ideal propulsion solution for light and ultralight aviation, hovercraft, gyro, helicopters, and other applications where weight is a significant concern. The 35 Series is a liquid cooled two-stroke heavy-fuel engine offering 1000 hours TBO at 75% power.

35HF Series Key Features

Two-cylinder two-stroke (inline)
60 hp (44 kW) at 6300 rpm according to DIN 70020 specification with 194°F coolant
Liquid cooled
Heavy-fuel
Maximum performance in extreme conditions
Highest power-to-weight ratio
NATO compliant
79 lb (36 kg) with fuel and water in the engine
OPTIONS:
Gear box G 50 (1:2,16 / 1:2,29 / 1:2,59 / 1:3,16 / 1:3,65)
Electronic throttle control via integrated servo
Integrated starter/generator 1-3kW/28V

For more information:
Hirth Engine Data Sheet

Hirth 35 Series Data Sheet

Hirth Sport Aviation Engine #3203 | 32 Series

65 HP Hirth 32 Series Engine / 3203

An ideal propulsion solution when vehicle weight is significant, the 32 series offers the highest power-to-weight ratio in the 65-horsepower market. An air cooled, two-stroke engine, the 32 series offers 1000 hours TBO at 75% power. Common applications include light and ultralight aviation, hovercraft, gyro and helicopters.