Happymodel EX1202.5

Stator	1202.5
KV options	6400, 8000
Weight	4.4 g
Shaft	1.5mm
Max cells	2-3S
Configuration	9N12P
Dimensions	Ø15x15 mm
Mount (bolt circle, mm)	Ø9 (4-M2)
Max thrust	127.8 g
Price (approx.)	14.49 USD

At 4.4 g it is right at the class average across the 3 1202-class motors in our database (avg 4.5 g).

Thrust data (Happymodel bench test)

KV	Prop	Battery	Throttle	Current	RPM	Thrust	Efficiency
6400	Gemfan 3018 bi-blade	2S	—	1 A	—	41.4 g	5.595 g/W
6400	Gemfan 3018 bi-blade	2S	—	2 A	—	67.3 g	4.547 g/W
6400	Gemfan 3018 bi-blade	2S	—	3 A	—	86.2 g	3.883 g/W
6400	Gemfan 3018 bi-blade	2S	—	4 A	—	104 g	3.514 g/W
6400	Gemfan 3018 bi-blade	2S	—	4.5 A	—	110 g	3.303 g/W
8000	48mm tri-blades	3S	—	1 A	—	28.4 g	2.559 g/W
8000	48mm tri-blades	3S	—	2 A	—	51.7 g	2.329 g/W
8000	48mm tri-blades	3S	—	3 A	—	69.9 g	2.099 g/W
8000	48mm tri-blades	3S	—	4 A	—	88.3 g	1.989 g/W
8000	48mm tri-blades	3S	—	5 A	—	102.9 g	1.854 g/W
8000	48mm tri-blades	3S	—	6 A	—	115.1 g	1.728 g/W
8000	48mm tri-blades	3S	—	7 A	—	126.9 g	1.633 g/W
8000	48mm tri-blades	3S	—	7.2 A	—	127.8 g	1.599 g/W
11500	65mm bi-blades	1S	—	0.5 A	—	9.2 g	4.973 g/W
11500	65mm bi-blades	1S	—	0.99 A	—	16.8 g	4.586 g/W
11500	65mm bi-blades	1S	—	1.51 A	—	25.4 g	4.546 g/W
11500	65mm bi-blades	1S	—	2.0 A	—	32.4 g	4.378 g/W
11500	65mm bi-blades	1S	—	2.5 A	—	39.2 g	4.238 g/W
11500	65mm bi-blades	1S	—	3.01 A	—	45.6 g	4.094 g/W
11500	65mm bi-blades	1S	—	3.5 A	—	51 g	3.938 g/W
11500	65mm bi-blades	1S	—	3.86 A	—	55.1 g	3.858 g/W
11500	65mm bi-blades	1S	—	3.92 A	—	55.2 g	3.806 g/W

Manufacturer bench figures (Happymodel bench, 6400 KV on a Gemfan 3018 2-blade at 2S (7.4 V), 8000 KV on a 48mm 3-blade at 3S (11.1 V) and the sheet's '11500KV' winding on a 65mm 2-blade at 1S (3.7 V); current steps 0.5-7.2 A, the sheet's throttle column being a PWM value (1531-2200 us) on the first two runs and not a percentage); real-world thrust varies with ESC, battery sag and prop condition.

Thrust-to-weight with this motor

Four Happymodel EX1202.5 motors at 127.8 g max thrust each give 511.2 g: 2:1, the minimum to fly, up to 255.6 g all-up; 4:1 (freestyle) up to 127.8 g; 8:1 (racing) up to 63.9 g.

RPM & prop speed on this motor

Props in this motor's class

Prop	Size	Blades	Weight
HQProp 51MMX2 Ultralight	2.0x0.9	2	0.23 g
Gemfan 2216 3-Blade	2.2x1.6	3	0.7 g
Gemfan 2216S PC 3-Blade	2.2x1.6	3	0.8 g
Gemfan Hurricane 2512	2.5x1.2	3	0.8 g
HQProp Durable T2x2x4	2.0x2.0	4	0.8 g

Where this data comes from

The rows are Happymodel's own 'EX1202.5 Brushless motor Bench data', published as an image (uploads/2020/09/未标题-1.jpg, 1000x853) in the gallery of its EX1202.5 product post on happymodel.cn - the post has no HTML table, which is why this motor was first recorded as having none. Three runs, each with a no-load block at 2 V: '12025-6400KV' (0.19 A, 12690 RPM, measured 6345 KV), '12025-8000KV' (0.3 A, 16260 RPM, 8130 KV) and '12025-11500KV' (0.39 A, 24680 RPM, 11980 KV). Every row reproduces its printed power as Voltage x Current and its printed efficiency as Thrust / Power. The sheet steps current, not throttle, and has no RPM column: its last column is headed 'Throttle' and holds PWM values (1531-2200) on the 6400 and 8000 KV runs, and on the 11500 KV run figures of 13770-32260 that are no throttle and are not labelled RPM, so throttle and RPM are empty on every row. kv_options gains 8000: the post's own block lists 'KV6400 KV8000 KV11000' and rates 6400 and 8000 at 2-3S. The third run is kept at the sheet's '11500KV' label but not added to kv_options, because the post sells an 11000 KV winding rated 1S only and no maker document names an 11500 KV one. max_thrust_g is the 8000 KV run's 127.8 g at 11.1 V. shaft 1.5mm is the post's 'Out Shaft Diameter: Φ1.5mm' (inner 2 mm); the bolt circle is the drawing's base view, 4M2 on Φ9±0.05. The drawing's 14.7±0.1 mm overall length includes the shaft; dimensions_mm keeps the post's Φ15x15 text.