Which Sheng-Fang turbojet should I choose for 6 to 12 kgf?

The B series covers this band: SW55B at 5.5 kgf, SW60B at 6 kgf, SW80B at 8 kgf and SW120B at 12 kgf. All four use the 42 g V3 ECU and weigh 780-1,640 g all-up, so the lightest airframe that meets the thrust requirement is usually the right pick.

What is the difference between the B series and the Pro series?

Both are the same engine architecture. The B series uses the 42 g V3 ECU with a brushless fuel pump, which makes it 490-500 g lighter at the same thrust rating. The Pro series uses the V4 (353-450 g) or V5 (910 g) ECU with the fuller telemetry and fault-logging set. Choose B when payload matters, Pro when you need the instrumentation.

Which models exceed the 400 N dual-use threshold?

SW600Pro at 588 N, SW800Pro at 784 N and XX400WP at 420 daN sit above the 400 N threshold and require an end-user certificate plus export licensing. SW400Pro at 392 N sits 8 N below it and is reviewed order by order. Every other model is below the threshold.

Do you publish prices?

No. Pricing depends on quantity, destination, export documentation and accessory set, so every order is quoted individually. Send the model, quantity and destination and you receive a quote within 24 hours.

Turbojet Engine Comparison — 17 Models, 5.5 to 400 kgf

Short answer, if you only read one paragraph

Under 12 kgf the B series wins on weight: the 42 g V3 ECU keeps SW55B at 780 g and SW60B / SW80B at 1,120 g all-up. From 14 to 30 kgf you pick between the same airframe in two builds — B for payload, Pro for telemetry. Above 30 kgf only the Pro series exists, and from 60 kgf upward every engine crosses the 400 N dual-use threshold, so licensing decides the order rather than performance.

Model	Series	Thrust (kgf)	Thrust (N)	Bare weight	All-up weight	ECU	Diameter	Length	Speed range	Max fuel flow	Supply	Op. temperature
XX400WP above 400 N	Flagship	400	4,200	69,000 g	—	—	330 mm	1,243 mm	—	≥ 1,000 L/h	28 V DC	—
SW800Pro above 400 N	Pro	80	784	8,400 g	10,715 g	910 g · V5	207.2 mm	454.7 mm	25,000-65,000 rpm	1,850 g/min	16-32 V DC	-40 to +50 °C
SW600Pro above 400 N	Pro	60	588	6,600 g	8,630 g	910 g · V5	177 mm	449.4 mm	25,000-72,000 rpm	1,735 g/min	18-32 V DC	-40 to +50 °C
SW400Pro	Pro	40	392	3,240 g	4,245 g	450 g · V4	148 mm	341.1 mm	35,000-97,000 rpm	1,000 g/min	4S LiPo	-40 to +50 °C
SW300Pro	Pro	30	294	2,560 g	3,490 g	450 g · V4	132 mm	331.4 mm	38,000-98,000 rpm	820 g/min	4S LiPo	-40 to +50 °C
SW300B	B	30	294.3	2,560 g	2,990 g	42 g · V3	132 mm	331.4 mm	38,000-98,000 rpm	820 g/min	3S LiPo	-40 to +50 °C
SW240Pro	Pro	24	235.2	1,800 g	2,650 g	353 g · V4	115.4 mm	277.5 mm	38,000-116,000 rpm	780 g/min	3S LiPo	-40 to +50 °C
SW240B	B	24	235.4	1,740 g	2,160 g	42 g · V3	115.4 mm	277.5 mm	38,000-116,000 rpm	780 g/min	3S LiPo	-40 to +50 °C
SW220Pro	Pro	22	215.6	1,800 g	2,650 g	353 g · V4	115.4 mm	277.5 mm	38,000-115,000 rpm	620 g/min	3S LiPo	-40 to +50 °C
SW220B	B	22	215.6	1,740 g	2,160 g	42 g · V3	115.4 mm	277.5 mm	38,000-115,000 rpm	620 g/min	3S LiPo	-40 to +50 °C
SW190B	B	19	186.3	1,500 g	1,915 g	42 g · V3	109 mm	258 mm	38,000-120,000 rpm	550 g/min	3S LiPo	-40 to +50 °C
SW170B	B	17	166.7	1,500 g	1,915 g	42 g · V3	109 mm	258 mm	38,000-116,000 rpm	480 g/min	3S LiPo	-40 to +50 °C
SW140B	B	14	137.3	1,280 g	1,640 g	42 g · V3	99 mm	241.4 mm	38,000-130,000 rpm	380 g/min	3S LiPo	-40 to +50 °C
SW120B	B	12	117.7	1,280 g	1,640 g	42 g · V3	99.4 mm	241 mm	38,000-125,000 rpm	350 g/min	3S LiPo	-40 to +50 °C
SW80B	B	8	78.4	800 g	1,120 g	42 g · V3	83 mm	200.9 mm	50,000-156,000 rpm	300 g/min	3S LiPo	-40 to +50 °C
SW60B	B	6	58.8	800 g	1,120 g	42 g · V3	83 mm	200 mm	50,000-150,000 rpm	260 g/min	3S LiPo	-40 to +50 °C
SW55B	B	5.5	53.9	535 g	780 g	42 g · V3	69.5 mm	175.2 mm	60,000-170,000 rpm	230 g/min	3S LiPo	0 to +40 °C

Rows in red exceed the 400 N threshold used in dual-use classification. Prices are not listed because they depend on quantity, destination and export documentation — every order is quoted individually.

By thrust

Take the smallest engine that lifts the payload

Every extra kgf costs 200-400 g of engine weight and 30-90 g/min of fuel burn. If 8 kgf carries the airframe, a 12 kgf engine is dead weight and shorter endurance.

By build

B series versus Pro series

Same architecture, different electronics. The 42 g V3 ECU saves 490-500 g at identical thrust. The V4 / V5 ECUs add 353-910 g and bring the fuller telemetry and fault-logging set.

By airframe

Five pairs share one body

60B/80B, 120B/140B, 170B/190B, 220B/240B and 220Pro/240Pro use the same body, mount and accessory set. Swapping within a pair changes nothing but the speed ceiling and the rating.

By compliance

Where the 400 N line falls

SW600Pro, SW800Pro and XX400WP sit above it and need licensing. SW400Pro at 392 N sits 8 N below and is reviewed order by order. Everything else clears without a licence.

Body diameter	Pair	Shared hardware	Ratings	Speed ceilings
83 mm	SW60B / SW80B	800 g unit, 1,120 g all-up	6 / 8 kgf	50,000-150,000 / 50,000-156,000 rpm
99 mm	SW120B / SW140B	1,280 g unit, 1,640 g all-up	12 / 14 kgf	38,000-125,000 / 38,000-130,000 rpm
109 mm	SW170B / SW190B	1,500 g unit, 1,915 g all-up	17 / 19 kgf	38,000-116,000 / 38,000-120,000 rpm
115.4 mm	SW220B / SW240B	1,740 g unit, 2,160 g all-up	22 / 24 kgf	38,000-115,000 / 38,000-116,000 rpm
115.4 mm	SW220Pro / SW240Pro	1,800 g unit, 2,650 g all-up	22 / 24 kgf	38,000-115,000 / 38,000-116,000 rpm

Compare Every Engine We Stock

Short answer, if you only read one paragraph

Take the smallest engine that lifts the payload

B series versus Pro series

Five pairs share one body

Where the 400 N line falls

One body, two ratings

Every model, one click

Send us the airframe, we send back the model