KingTech Alternative: Comparing the G4+ Range to Sheng-Fang

KingTech is the closest thing to a like-for-like competitor in this market, and pretending otherwise would waste your time. Their G4+ range covers 3 kgf to 45 kgf with a denser grid than ours, publishes retail prices, and publishes a service kit price. Where the two lines overlap they are genuinely close: the K210G4+ and our SW220B are both 1,740 g, within 3 mm of each other in diameter and length, and within 5% on both thrust and fuel burn. This page lays out where KingTech wins, where we win, and the one thrust bracket where we have nothing to sell you.

1. The two product grids, drawn to the same scale

Most comparison articles line up engines by model number. That hides the thing that actually decides purchases: whether a manufacturer has an engine at your thrust. Here are both ranges sorted by thrust.

Weights are bare engine weights as published by each manufacturer. KingTech brackets are taken from their G4+ specification sheets; Sheng-Fang figures from our datasheets, the same data behind our full model comparison.

Two things are obvious from that table. First, KingTech's grid is denser in the 20–26 kgf band: three engines where we offer two. Second, above 32 kgf we have the range to ourselves until KingTech's 45 kgf class, and below 5.5 kgf KingTech has the range to itself. Neither of those is a design philosophy; it is where each company chose to tool up.

2. K210 vs SW220B: the closest match in the whole market

These two engines are so close that a specification comparison almost does not help. Look at the numbers and then read what follows.

Same weight. Same service interval. Same specific fuel consumption to two decimal places. Within 3 mm in both dimensions. The SW220B makes 4.7% more thrust and burns 5.1% more fuel, which is the same statement written twice — the two engines are running essentially the same cycle with slightly different mass flow.

So the decision is not technical. It comes down to three questions: can you get a KingTech faster than you can get ours, do you want a published retail price before you commit, and which manufacturer will you still be able to buy a turbine wheel from in five years. We have an opinion on the third, KingTech has an opinion on the third, and neither of us can prove it.

3. K235 vs SW240B: where the trade becomes visible

This is where we win on mass and lose on fuel, and the numbers are big enough to matter both ways. The SW240B is 260 g lighter — 13% — and 3.6 mm narrower. But it burns 14.7% more fuel to make 2.3% more thrust. Over an hour at full load that is 6 kg of extra kerosene.

Our own SW220B is the honest answer to this bracket. It is 1,740 g, burns 620 g/min, and makes 215.6 N — better fuel efficiency than the SW240B, in the same envelope, at the cost of 19.8 N. If you were about to buy a K235 for a long-endurance mission, compare it against our SW220B rather than the SW240B: you give up 14.4 N of thrust and get 0.173 kg/(N·h), which is the same efficiency as the KingTech.

4. K320 vs SW300B: same envelope, different tuning

This pair is the most interesting engineering comparison in the article, because the two engines occupy almost exactly the same physical space.

A 0.5 mm diameter difference and 1.4 mm length difference is measurement noise — these two engines fit in the same hole. Inside that same hole, KingTech extracts 19.7 N more thrust for 240 g more engine mass, at identical specific fuel consumption. That is a genuine engineering result in KingTech's favour and there is no way to dress it up: at 30–32 kgf their core runs harder than ours for the same fuel efficiency.

Where we hold ground is installed mass: 2,990 g complete against a bare engine weight of 2,800 g for the K320, which means the K320's complete system will land somewhere north of 3,300 g once ECU, pump and valves are counted. If your airframe is mass-limited rather than thrust-limited, ask for the K320 system weight in writing before you commit — the bare weight comparison flatters it.

5. The 26 kgf bracket, where we have nothing

The KingTech K260 is 26 kgf, 2,200 g, 120 mm diameter, 299 mm long, 760 g/min, and listed at around €4,049 in Europe. We do not have an engine in that bracket. Our range jumps from 24 kgf (SW240B) to 30 kgf (SW300B), and a customer who needs 26 kgf with a 2.2 kg mass budget has exactly one sensible option.

We could point at the SW300B and say it covers the requirement with margin, and it does — but it is 360 g heavier and 4.5 kgf more thrust than asked for, and on a small airframe that overshoot costs you fuel and mass you did not budget. If you need 26 kgf, buy the K260. We would rather tell you that than sell you the wrong engine.

6. Price, and the honest position

KingTech publishes retail prices: the K235G4+ lists around €3,720 / $3,350, the K260 around €4,049, and their service kit runs $300–350 per 25-hour interval. That is a genuinely useful thing for a buyer, because it lets you build a lifecycle cost model before you talk to anyone.

We do not publish a price list. Capital equipment in this class is quoted per order, because ECU version, telemetry option, harness length, spare kit, nozzle variant and the export documentation set all change the number. Send the model, quantity, destination country and intended use, and a written quotation with the full datasheet comes back within 24 hours — including the service kit price, so you can run the same lifecycle model you would run on the KingTech.

Be clear-eyed about what a published price does and does not tell you. It is a starting point for negotiation, not a transaction price, and it does not include freight, duties, spares or licensing. But it does mean KingTech is more transparent on cost than we are, and if that is your priority you should weight it accordingly.

7. Service model

Both manufacturers publish 25 flight hours for bearing inspection and turbine clearance, which makes this the one part of the comparison that is genuinely apples to apples. At 10-minute sorties, 25 hours is 150 flights. KingTech's service kit is $300–350. Ours is quoted per project, and we will quote it alongside the engine so you are not discovering it later.

The variable that does not appear on either datasheet is turnaround time. A 25-hour interval is meaningless if the engine sits in a customs queue for six weeks. Ask both manufacturers the same question in the same units: from engine leaving my facility to engine back in my hands, how many days, and what does it cost.

8. Export compliance across both ranges

The 400 N threshold in China's dual-use export control list, effective 18 November 2026 under Ministry of Commerce Announcement No. 49, sits above every engine in the 3–32  kgf overlap between the two ranges. That means the K210, K235, K260, K320, SW220B, SW240B and SW300B all fall in the normal commercial category on the Chinese side.

Above that line things change. Our SW400Pro is rated 392 N, deliberately inside the commercial category at its measured performance; the SW600Pro at 588 N and SW800Pro at 784 N are above it and require an export licence and end-user certificate. KingTech's 45 kgf class at roughly 441 N is also above the line.

Regardless of thrust, we ask for an end-user certificate as standard. It protects both sides and some destinations require it anyway.

9. Decision framework

10. Frequently Asked Questions

Is the SW220B a copy of the KingTech K210?

No, but the resemblance is not accidental either. Both are 1,740 g single-shaft turbojets converging on the same 21–22 kgf operating point, and physics pushes both designs toward similar dimensions. The differences are real: 112.6 mm vs 115.4 mm diameter, 120,000 rpm vs 115,000 rpm, 590 g/min vs 620 g/min. Whether that counts as independent design or convergent engineering is a fair question, and the answer is that at this size every manufacturer is solving the same equation.

Which is more reliable, KingTech or Sheng-Fang?

We cannot answer that with data, and neither can KingTech. Reliability depends on the duty cycle, the installation, the fuel quality and the operator. What we can tell you is that both publish a 25-hour service interval, both use kerosene with 3–5% turbine oil, and both protect the turbine with an over-temperature limit. Ask for fleet hours in your specific application, from either manufacturer, and treat any answer that is not a number as a non-answer.

Do you have an engine at 26 kgf?

No. Our range steps from 24 kgf (SW240B) to 30 kgf (SW300B). If you need 26 kgf with a roughly 2.2 kg mass budget, the KingTech K260 is the right purchase and we will tell you so. The SW300B covers the thrust requirement but adds 360 g and 4.5 kgf you did not ask for.

Why is the SW240B less efficient than the K235?

Because it reaches 235.4 N by spinning the same core 7,000 rpm faster than the SW220B does, which pushes it past its most efficient operating point. Fuel flow rises from 620 to 780 g/min. SFC goes from 0.173 to 0.199 kg/(N.h), 12.4% worse than the K235. If efficiency matters more than the last 5 N of thrust, take the SW220B instead.

Can I run KingTech accessories on a Sheng-Fang engine?

No. Each engine is supplied as a matched engine-plus-ECU set with start and acceleration parameters calibrated to that specific engine. Mixing a controller from one manufacturer with an engine from another is not a supported configuration, will not be warranted, and in the worst case damages the turbine during start. Budget the full set.

How much does a 25-hour service cost?

KingTech publishes $300 to $350 per service kit. Ours is quoted per project alongside the engine, so you have the number before you commit rather than after. Both engines use the same 25-hour interval, so the comparison is genuinely like for like once you have both figures.

Do you publish prices like KingTech does?

No. Capital equipment in this class is quoted per order because ECU version, telemetry option, harness length, spare kit, nozzle variant and the export documentation set all change the number. Send the model, quantity, destination and intended use for a written quotation within 24 hours, including the service kit price so you can build the same lifecycle model.

Does the 400 N threshold affect the K320 or the SW300B?

No. Both sit well below 400 N, so they fall in the normal commercial category under China's dual-use control list effective 18 November 2026. Above that line: our SW600Pro (588 N) and SW800Pro (784 N) require an export licence, as does KingTech's 45 kgf class at roughly 441 N. Our SW400Pro at 392 N sits just inside the commercial category.

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