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Fixed-Wing Motors

BGS-FW4125 Long Axis AT Series Motors

Product Number:FW4125

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These long-shaft brushless motors include KV250 and KV540 variants with 12N14P slot-pole structure. 350/355g units run on 6S-12S LiPo, delivering steady 50A/85A max current for heavy-load large fixed-wing aircraft.

Motor dimensions
50*74mm
Number of slots
12N14P
Copper wire grade
220℃
Shaft diameter
6mm
Motor weight
350g
Service life
＞1000h

Technical Specifications

AT4125 Basic Data
Parameter:Long Shaft KV250	Weight (with leads):350g/355g
Test Model:KV250/KV540	Phase-to-phase Internal Resistance:68m/14m
Motor Dimensions:50*74mm	Slot-pole Configuration:12N14P
Lead Specification:100mm	Rated Operating Voltage (Lipo):12S
Shaft Diameter:6mm	Maximum Current (180s):50A/85A
No-load Current (10V):1.0A/2.6A	Maximum Continuous Power:365W/446W

test data

Model	Propeller	Accelerator	Voltage	Current	Power	Speed	Torque	Voltag	Efficiency	Motor Temperature
AT4125 长轴 KV250	/	(%)	(V)	(A)	(W)	(RPM)	(N.m)	(g)	(g/W)	(℃)
	APC 15*8	40.%	44.37	2.76	122.38	3922	0.210	1027	8.39	78
		45.%	44.34	3.42	151.62	4319	0.254	1242	8.19
		50.%	44.31	5.02	222.62	4911	0.334	1631	7.33
		55.%	44.28	6.78	300.43	5453	0.419	2042	6.80
		60.%	44.25	8.71	385.57	5931	0.502	2433	6.31
		65.%	44.20	10.86	479.91	6368	0.579	2791	5.82
		70.%	44.16	13.22	583.56	6767	0.669	3213	5.51
		75.%	44.10	16.36	721.40	7237	0.779	3719	5.15
		80.%	44.04	19.79	871.73	7703	0.893	4220	4.84
		90.%	43.90	28.10	1233.40	8406	1.153	5078	4.12
		100.%	43.70	39.92	1744.46	9145	1.473	5838	3.35
	APC 16*8	40.%	44.35	3.27	145.16	3863	0.261	1253	8.63	96
		45.%	44.33	4.11	182.31	4249	0.320	1527	8.37
		50.%	44.30	5.86	259.41	4815	0.414	1983	7.65
		55.%	44.26	8.26	365.43	5373	0.517	2469	6.76
		60.%	44.21	10.58	467.56	5800	0.617	2935	6.28
		65.%	44.16	13.15	580.61	6234	0.722	3400	5.86
		70.%	44.12	16.13	711.69	6643	0.843	3933	5.53
		75.%	44.05	19.73	869.19	7058	0.963	4476	5.15
		80.%	43.97	24.10	1059.85	7500	1.102	5042	4.76
		90.%	43.80	33.50	1467.45	8169	1.383	6182	4.21
		100.%	43.58	47.04	2049.62	8831	1.723	7053	3.44
AT4125 　长轴　KV540	APC 15*8	40.%	22.38	11.21	250.81	4943	0.341	1674	6.68	84
		45.%	22.34	13.58	303.32	5313	0.395	1929	6.36
		50.%	22.29	16.21	361.27	5650	0.452	2205	6.10
		55.%	22.24	19.14	425.84	5978	0.513	2492	5.85
		60.%	22.18	23.20	514.39	6382	0.595	2864	5.57
		65.%	22.10	27.69	611.87	6806	0.676	3233	5.28
		70.%	22.02	32.79	722.03	7193	0.766	3655	5.06
		75.%	21.93	38.58	845.87	7571	0.863	4081	4.82
		80.%	21.80	45.80	998.46	7963	0.970	4541	4.55
		85.%	21.68	52.89	1146.84	8301	1.072	4951	4.32
		90.%	21.52	62.57	1346.88	8577	1.213	5163	3.83
		100.%	21.36	72.77	1554.08	8879	1.344	5537	3.56
	APC 16*8	40.%	22.20	11.43	253.85	4637	0.378	1798	7.08	97
		45.%	22.16	13.89	307.76	4970	0.437	2069	6.72
		50.%	22.11	16.79	371.33	5309	0.502	2380	6.41
		55.%	22.05	20.26	446.90	5686	0.585	2771	6.20
		60.%	21.96	25.87	568.11	6118	0.694	3241	5.70
		65.%	21.86	31.71	693.11	6522	0.804	3738	5.39
		70.%	21.77	37.21	810.01	6873	0.896	4145	5.12
		75.%	21.66	44.10	955.01	7239	1.011	4635	4.85
		80.%	21.51	52.74	1134.53	7597	1.149	5207	4.59
		90.%	21.23	69.58	1477.35	8206	1.370	6054	4.10
		100.%	21.03	81.72	1718.70	8492	1.528	6618	3.85