PBS TJ100 Alternative: Comparing 1,000–4,200 N Turbojets for UAVs & Target Drones

The PBS TJ100 is one of the most widely used small turbojets in the world — over 1,000 units were produced in 2019 alone, according to PBS Aerospace. But as UAVs grow larger, faster and carry heavier payloads, many engineers find the TJ100's 1,250 N (127 kgf) ceiling is no longer enough. This guide compares the TJ100 against its PBS siblings (TJ40-G1, TJ150) and the larger 4,200 N XX400WP, so you can identify the right engine class for your platform — and avoid paying for thrust you do not need or running out of thrust mid-mission.

1. Why Engineers Look for a PBS TJ100 Alternative

The TJ100 is a mature, well-supported engine with a strong track record. Engineers typically start evaluating alternatives when they hit one of these walls:

• Their airframe has outgrown 127 kgf. Target drones simulating modern jet threats, heavy reconnaissance UAVs, and loitering munitions in the 400–1,000 kg MTOW range need 200–500 kgf of installed thrust — well beyond the TJ100.
• They need higher speed or altitude. The TJ100 is rated to Mach 0.8 and 10,000 m. Platforms requiring transonic dash (Mach 0.9+) or high-altitude operation above 10 km need a different engine.
• Lead time or cost is an issue. Retail pricing for a TJ100 is commonly cited at USD 65,000–70,000 per unit, with lead times that can stretch to several months depending on configuration and export approvals.
• They need higher electrical power. The TJ100's integrated starter-generator produces 650–750 W — sufficient for basic avionics but tight for platforms carrying high-power sensors, radars or jamming payloads.
• They need salt-water recovery or a custom nozzle. PBS does offer a salt-water variant (TJ100P), but custom modifications are limited and add lead time.

2. PBS TJ100, TJ150, TJ40-G1 at a Glance

PBS Velká Bíteš (Czech Republic) builds a family of small turbojets that share a common architecture — single-shaft, radial compressor, annular combustor, axial turbine, fixed nozzle. The table below is compiled from the official PBS Aerospace and pbs.cz product pages.

*Weight varies by configuration and accessories. TJ100 weight ranges 17.6 kg (pbsindia.com basic spec) to 19.7 kg (pbs.cz with accessories) and 21.2 kg (pbsaerospace.com US spec including accessories). TJ150 weight ranges 17.1 kg (pbsindia.com) to 20.7 kg (pbsaerospace.com US spec including accessories). Data: PBS Aerospace TJ100, TJ100P, TJ150, pbs.cz.

2.1 TJ40-G1 — The Smallest PBS Turbojet

At 395–425 N and just 3.4 kg, the TJ40-G1 is designed for small expendable UAVs, decoy aircraft and target drones in the 30–80 kg class. It shares the TJ100's architecture but is significantly smaller (147 mm diameter, 304 mm length) and rated for a 50-hour design life. It is not a direct TJ100 competitor — it is two thrust classes below — but it is worth knowing about if your platform is smaller than you initially thought.

2.2 TJ100 — The Benchmark

The TJ100 produces 1,100–1,250 N at 17.6–19.7 kg dry weight, giving a thrust-to-weight ratio of roughly 5.7–7.2:1 depending on configuration. It is notable for its relatively long 300-hour TBO, integrated starter-generator (650–750 W), and broad fuel compatibility (Jet A-1, JP-4, JP-8, TS-1, T2, RT). It supports ground start, in-flight restart, and windmill starting down to Mach 0.6. The standard version is widely used in tactical UAVs, target drones and experimental light aircraft.

2.3 TJ100P — The Salt-Water Variant

The TJ100P is a fuel-lubricated version of the TJ100 with a lower weight (17.6 kg) and salt-water recovery capability, designed for naval target drones that may ditch in the ocean. It reaches Mach 0.9 (versus 0.8 for the standard TJ100) and uses 3% oil mixed in fuel rather than a separate oil system. It is the variant of choice for ship-launched target drones.

2.4 TJ150 — The Top of the PBS Range

The TJ150 is the most powerful turbojet PBS currently produces, delivering 1,500 N (153 kgf / 337 lbf) at 17.1–20.7 kg. It comes standard with FADEC, supports custom nozzle lengths and salt-water recovery as an option, and is aimed at high-speed target drones and UCAVs. Its main trade-off is a shorter design life of 50 hours — reflecting its target-drone mission profile rather than long-duration reusable operations.

3. Full Comparison: PBS TJ100 vs TJ150 vs XX400WP

The Sheng-Fang XX400WP sits in the next thrust class up. It is not a drop-in TJ100 replacement — it is three times the thrust and roughly four times the weight — but for platforms that have outgrown the PBS range, it is the production-ready option. The table below provides a side-by-side engineering comparison.

PBS data from pbsaerospace.com and pbs.cz (accessed August 2026). XX400WP data from manufacturer test-cell report. Some parameters (SFC, vibration, exact fuel flow) for PBS engines are not published on public datasheets; request the official installation manual for certified values. XX400WP pricing under NDA.

4. When to Choose Which Engine

4.1 Choose the PBS TJ100 If…

• Your platform MTOW is 100–250 kg and thrust requirement is under 127 kgf.
• You need a reusable engine with 300-hour TBO for repeated training or ISR sorties.
• Your cruise speed is Mach 0.6–0.8 at altitudes up to 8,000 m.
• You want a mature, well-documented engine with global support and EASA-aligned certification.
• Your electrical load is under 750 W.

4.2 Choose the PBS TJ150 If…

• Your platform MTOW is 150–350 kg and you need the extra 25 kgf over the TJ100.
• You operate high-speed target drones that require FADEC and custom nozzle options.
• A 50-hour design life is acceptable (expendable or short-life missions).
• You may need salt-water recovery for naval operations.

4.3 Choose the XX400WP If…

• Your platform MTOW is 600–1,200 kg and requires 250–420 kgf of installed thrust.
• You need transonic performance — Mach 0.95 dash at 10,000 m+.
• You operate above 10,000 m (up to 13,000 m).
• You need high onboard electrical power (3 kW at 28 V DC) for radar, EW or sensor payloads.
• Your mission is short-duration, high-thrust (target drone, decoy, threat simulator, one-way vehicle) where a 30-hour design life is sufficient.
• You require a 6-year sealed storage life for reserve stockpiles.

5. Cost, Lead Time and Lifecycle Economics

Acquisition price is only one dimension. The table below summarises the economic profile of each engine class based on publicly available pricing and typical B2B procurement patterns.

PBS TJ100 retail pricing from industry sources and distributor listings; actual pricing varies by configuration, quantity and support package. XX400WP pricing provided under quotation after end-use certification.

The TJ100's 300-hour TBO makes it the most economical option on a cost-per-flight-hour basis for reusable platforms — which is why it dominates the tactical UAV segment. The TJ150 and XX400WP are designed for target drones and expendable missions where the engine may only fly once or for a few dozen hours, so cost-per-hour is less relevant than unit price, delivery reliability and mission performance.

6. Integration and Support Considerations

6.1 Fuel System Sizing

The TJ100 and TJ150 share a 272 mm diameter and similar fuel requirements. The XX400WP requires a maximum fuel flow of ≥1,000 L/h at an inlet pressure of ≥0.05 MPa — roughly an order of magnitude more than the PBS engines. Airframe fuel lines, boost pumps, filters and tanks must be sized accordingly.

6.2 Electrical Power

The TJ100/TJ150 provide 600–750 W, which covers basic avionics and a small sensor payload. The XX400WP's 3 kW (28 V DC) starter-generator can power a full avionics suite plus high-power radar, EW jammer, or EO/IR turret without a separate APU — a significant advantage for sensor-heavy platforms.

6.3 Mounting and Vibration

The XX400WP is rated for 8 g rms steady-state and 15 g rms transient vibration across 0–1,200 Hz. Mounts must be machined metal (not polymer), and the avionics bay should be isolated with rated shock absorbers. The TJ100/TJ150 have lower vibration due to their smaller rotating mass and can use lighter composite or aluminium mounts.

6.4 Support and Documentation

PBS provides installation manuals, maintenance training and a global distributor network (including PBS Aerospace in the US and PBS India). Sheng-Fang provides an installation manual, test-cell report, certificate of conformity, and engineering support via email and WhatsApp. For defence and government customers, on-site integration support can be arranged under contract.

7. Export Compliance

All three engine families are subject to dual-use export controls because they produce more than 2.2 kN (225 kgf) of thrust — wait: the TJ100 and TJ150 produce less than 2.2 kN. However, they are still controlled as military-use items under many national regimes when intended for UCAVs, target drones simulating military threats, or missile applications.

The XX400WP at 4.2 kN is definitively classified as a dual-use item under China's Dual-Use Items Export Control Regulations. The process requires:

1. End-User Certificate (EUC): Issued by the buyer's government or sponsoring organisation, stating end user, end use, and no re-transfer without authorisation.
2. Export licence application: Submitted by Sheng-Fang to MOFCOM. Processing takes approximately 30–45 working days after complete documentation is accepted.
3. Shipping and customs clearance: Engine ships with test report, certificate of conformity, export licence, and commercial documents.

8. Decision Framework

Use this checklist to identify the right engine class for your platform:

• ☐ MTOW under 250 kg, Mach under 0.8 → PBS TJ100
• ☐ MTOW 150–350 kg, target drone, can accept 50 h life → PBS TJ150
• ☐ Naval target drone, salt-water recovery needed → PBS TJ100P or TJ150 salt-water variant
• ☐ MTOW 30–80 kg, expendable decoy → PBS TJ40-G1
• ☐ MTOW 600–1,200 kg, Mach 0.9+, altitude 10 km+ → Sheng-Fang XX400WP
• ☐ Need 3 kW+ onboard electrical power → XX400WP
• ☐ MTOW 350–600 kg (150–300 kgf) → contact manufacturers directly; limited off-the-shelf options

9. Frequently Asked Questions

Is the PBS TJ100 still in production?

Yes. The TJ100 is one of PBS's most successful products, with over 1,000 units produced in 2019 alone. PBS continues to develop and support the engine family, including the TJ100P salt-water variant.

What is the difference between the TJ100 and TJ100P?

The TJ100P is a fuel-lubricated variant (3% oil in fuel) with salt-water recovery capability, lower weight (17.6 kg), a higher Mach limit (0.9) and an integrated 700 W starter-generator. It is designed for naval target drones. The standard TJ100 uses a separate oil system (MIL-L-23699), weighs 19.7 kg with accessories, and is rated to Mach 0.8.

Is the XX400WP a direct replacement for the TJ100?

No. The XX400WP produces 4,200 N — more than three times the TJ100's thrust — and weighs 69 kg versus 19.7 kg. It is intended for airframes that are significantly larger (600–1,200 kg MTOW) and faster (Mach 0.95) than TJ100-class platforms. It is the next step up when your platform outgrows the PBS range, not a drop-in swap.

Are there any turbojets between 150 kgf and 400 kgf?

There are listings for 200 kgf and 308 kgf turbojets from various Chinese manufacturers, but public technical documentation, independent test-cell verification and export readiness vary significantly. Evaluate suppliers carefully, request test-cell reports, and confirm production capacity before locking in an airframe design around these engines.

Can I use Jet A-1 in all these engines?

Yes. The PBS TJ100/TJ150 accept Jet A-1, JP-8, TS-1 and several other kerosene-type fuels. The XX400WP uses RP-3 (GB6537-2006), which is chemically equivalent to Jet A-1; it can operate on Jet A-1 with appropriate fuel system configuration.

How long does export approval take for the XX400WP?

Production requires 45–60 working days, and the Chinese dual-use export licence requires an additional 30–45 working days after complete documentation is accepted. Total lead time is approximately 90–105 working days from contract signature. Starting the EUC process early can shorten the schedule.

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