HK-45A Micro class
Thrust 4.5 kgf
Ø60 × 165 mm
0.54 kg total
Our smallest production turbojet — 225,000 rpm, 0.125 kg/s airflow — for miniature target drones and research platforms.
Micro Turbojet Propulsion
Compact turbojet engines, engineered to fly further.
HK Turbines designs and manufactures production-ready micro turbojet engines from 4.5 kgf to 200 kgf of thrust — purpose-built for target drones, high-speed UAVs and aerial research platforms. Factory-direct, export-ready, with full technical documentation for every model.
14Production models
4.5–200kgf thrust range
16,000 mMax operating altitude
0.95Max flight Mach number
Why HK Turbines
Propulsion you can build a platform around
Every engine ships with a complete technical data package, so your integration team can move from first bench run to first flight without surprises.
Wide thrust range
Fourteen production models spanning 4.5 kgf to 200 kgf, sharing common start logic and fuel interfaces to simplify fleet-level integration.
Documented performance
Full spec sheets: thrust, SFC, airflow, pressure ratio, idle characteristics and altitude envelope — measured at a defined design point, not estimated.
Electric or fuel start
Every model supports both electric-starter and fuel-based starting, with start times under 40–80 s and start altitudes up to 4,500 m.
Generator options
Selected models (HK-400B, HK-800B) integrate an onboard generator delivering DC 28 V ±1.2 V at up to 650 W / 1,200 W for avionics and payloads.
Engine Line-up
Three classes. One production line.
Pick the thrust class that matches your airframe. Full parameters and side-by-side comparison are on the products page.
HK-400A Mid class
Thrust 40 kgf
Ø148 × 319 mm
4.02 kg total
The workhorse of the range. 0–8,000 m envelope, 0.8 Mach, with an optional 650 W generator variant (HK-400B).
HK-2000A Heavy class
Thrust 200 kgf
Ø295 × 690 mm
29.0 kg total
Flagship large engine: 200 kgf thrust, 4.6 pressure ratio, service ceiling to 16,000 m and Mach 0.95.
Applications
Where our engines fly
From sub-5 kg research airframes to 200 kgf-thrust high-speed platforms, HK engines are integrated across a broad range of unmanned and experimental aircraft.
Target drones & aerial targets
Reliable, repeatable propulsion for reusable target and towed-target platforms that fly high-tempo sortie schedules.
High-speed & swarm UAVs
Compact, lightweight turbojets with Mach 0.6–0.95 envelopes for fast UAS and coordinated multi-platform missions.
R&D and education
Well-characterised engines with published curves and idle data — ideal for universities, test benches and propulsion research.
Aerial imaging platforms
Low-vibration micro-turbine propulsion stabilises gimbal payloads for high-altitude aerial photography and mapping.
Decoy & expendable platforms
Cost-efficient engines with a 60 h service life and 25 h first-overhaul interval, tuned for single-sortie economics.
Custom integration
Mounting brackets, ECU mapping, fuel-system and generator configurations tailored to your airframe on request.
How we work
From enquiry to first flight
A straightforward four-step path, supported by engineers who speak your airframe's language.
Select a class
Tell us your airframe mass, target speed and altitude. We shortlist the engine class and confirm the thrust margin.
Review the data package
We issue the full technical specification, interface drawings and generator options for your integration review.
Bench & integration
Sample units for bench runs, mounting and fuel-system trials, with remote support from our engineers.
Volume delivery
Serial production with consistent unit-to-unit performance, spare parts and overhaul support.
FAQ
Frequently asked questions
What thrust range do HK engines cover?
Fourteen production models from 4.5 kgf (HK-45A) up to 200 kgf (HK-2000A). Mid-range models include 40, 45, 65, 80, 105, 120 and 160 kgf variants, so most airframes can be matched without custom development.
What fuel and oil do the engines use?
Aviation kerosene or diesel blended with 5% turbine oil. Recommended lubricating oil is Mobil Jet Oil II. Both electric-starter and fuel-based starting are supported on every model.
What is the service life and overhaul interval?
Total service life is 60 hours with a 25-hour first-overhaul (TBO) interval across the range. Accel/decel response is 6 s / 8 s on all models.
Do you offer onboard power generation?
Yes. The HK-400B provides DC 28 V ±1.2 V at up to 650 W, and the HK-800B provides DC 28 V ±1.2 V at up to 1,200 W, suitable for powering avionics and payload systems in flight.
How high and how fast can they operate?
Depending on model: operating altitudes from 6,000 m up to 16,000 m, maximum flight Mach number from 0.6 to 0.95, and maximum self-start altitude of 4,500 m.
Can I get a sample unit for integration testing?
Yes. We supply evaluation units for bench runs and airframe integration. Contact our sales engineers with your platform requirements and we will propose the right model and lead time.
Need thrust numbers for your airframe?
Send us your platform mass, speed and altitude targets — our engineers will recommend the right model and share the full technical data package.
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