Micro Turbojet Engine
2 year ago
Yetnorson Antenna Co., Ltd.
9 year
Product details
Getting Real About the 40kg Turbojet Engine: What You Actually Need to Know Before Picking One for Your UAV
If you‘re reading this, you’ve probably already sifted through a dozen spec sheets and glossy brochures. I get it. When I first started looking into a proper micro turbojet for a UAV build last year, the process was overwhelming. Every manufacturer promises the best Turbojet Engine Turbojet, but half of them ghost you when you ask for a real-world thrust curve or a video of the engine running past 6000 meters. You want the power-to-weight, you want the specific fuel consumption (we’ll call it SFC from here on), and you want to make sure the thing won’t flame out the moment your drone hits a thin air pocket.
So let’s skip the fluff and talk about what actually matters when you’re shopping for a 40kg-class Turbojet Engine—specifically the kind that you can actually buy, integrate, and fly without needing a defense contractor’s budget.
Real performance numbers (and what they mean)
I’ll be straightforward—spec sheets lie when there‘s no test cell data to back them up. We’ve been guilty of quoting optimistic numbers before. Here‘s what our current production batch actually delivers, measured on a calibrated load cell at sea level:
Thrust: 40 kg continuous at max rating speed. That’s steady-state, not a burst number. If your airframe is designed for a 40 kg powerplant, you won‘t hit thermal limits five minutes into the mission.
Max Rating Speed: 96,500 RPM. We top out here, not at some theoretical number the bearings can’t hold. The rotational group is balanced within tighter tolerances than what you‘d find in most RC-grade turbines.
Operation Altitude: 0 to 8000 meters. This gets asked a lot—how does the Engine actually perform at the ceiling? The SFC climbs a bit once the air gets thin, but the ECU compensates fuel trim automatically. You won’t need to baby the throttle.
Operation Mach Number: 0 to 0.8. If you‘re flying subsonic dash missions, the intake and compressor profile supports it without choking.
SFC: 1.55 kg/(kgf·h). Let’s be honest—efficiency in a pure turbojet is never going to match a high-bypass turbofan. This number sits squarely in the competitive range for small turbojet engines. Expect the trade-off for raw speed.
Start Time: About 40 seconds from button press to idle. Sometimes a few seconds longer the first time you fire it up after storage, but once the fuel lines are primed, it‘s consistent.
Start Mode: Electric motor/fuel start. No pyrotechnic cartridges, no ground support cart needed. Just a battery pack and kerosene.
Why altitude and start behavior matter more than you think
One mistake I’ve seen firsthand: an operator specs a turbine based purely on sea-level thrust, then wonders why the climb rate falls off at 5000 meters. Air density is the silent killer. Our Engine control unit maps fuel flow against inlet pressure and EGT in real time. That means you get a smooth, predictable thrust curve all the way to the operational ceiling. You also avoid the dreaded “thrust attenuation” problem that older engines suffer from after a few hundred hours on the clock.
Starting elevation is another piece that doesn‘t show up on a glossy product image. We’ve successfully lit this unit at airfields at 4000-meter elevation without external pre-heating—something that matters a lot if you‘re operating from high-altitude launch sites.
What’s under the housing
On the cold side you’ve got a single-stage centrifugal compressor, and on the hot side it’s an axial turbine. Nothing exotic, because exotic means impossible to source parts. Bearings are hybrid ceramic, fuel-lubricated, and the combustion chamber uses a standard can-type layout that you can inspect with a borescope during maintenance. The engine ships with the ECU, wiring harness, and fuel pump—everything you need to run it on a test stand within an hour of unboxing.
Final thought
If you're trying to figure out which Turbojet Engine for UAV actually holds up, this one is a pretty safe bet. We've seen it fly on everything from fast model jets to proper experimental airframes, and it just works without needing constant tweaking.
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Yetnorson Antenna Co., Ltd.
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9 year
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