5- to 7-inch FPV motor

DYS SunFun 2306

A 2306 FPV motor from DYS: 34.53 g, φ28.5 × 17 mm, and up to 1,580 g of thrust in DYS’s 20 V test (2500KV, 6040 two-blade).

5- and 6-inch props (2500KV)
7-inch props (1750KV)
Tested on 4S and 5S

Drawing the 3D model…

Throttle60%

The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2306 motor drawn from DYS’s published sizes, not its exact design. No-load speed is KV × 22.2 V, a nominal pack for this version. DYS’s bench tables for it step by thrust rather than throttle, so they are in the bench data below, not on this readout.

Version

1750KV2500KV

DYS’s bench results are with 5045 and 6040 two-blade props on 4S and 5S packs (16 V and 20 V).

Weight: 34.53 g; DYS’s photo shows it weighed with its leads

Plain links: we earn nothing from them.

What you get

About 1.6 kg on 5S
On a 20 V pack DYS measured 1,580 g from the 2500KV on a 6040 two-blade, drawing 35.2 A; on 16 V the same prop pulled 1,327 g.
Source: DYS product page
A 1750KV for 7-inch props
DYS tested the 1750KV on a 7×4E prop: 1,250 g at 26.5 A on 20 V, and 1,050 g at 21.8 A on 16 V.
Source: DYS product page
34.53 g
DYS gives 34.53 g and shows the motor on a scale with its leads.
Source: DYS product page

What to pair it with

Our reading of DYS’s numbers, so your build matches what the motor was tested with.

ESC: DYS’s highest test current is 35.2 A (2500KV, 6040 two-blade, 20 V); the 1750KV reached 26.5 A on a 7×4E. DYS publishes no current rating. (DYS product page)
Props: DYS tested the 2500KV on 5045 and 6040 two-blades and the 1750KV on a 7×4E. (DYS product page)
Battery: DYS’s tests use 4S and 5S packs (16 V and 20 V); it publishes no cell rating. (DYS product page)
Frame: Four M3 holes on a 16 mm circle (16 × 16 mm). (DYS drawing)

Where to buy

GetFPVchoose the KV
price on the store’s page
Visit

Plain links, not affiliate links. Prices change; the store’s page has the current one.

Full specs

Spec	Value	Source
KV	2,500 rpm/V (also 1750KV)	DYS product page
Stator	23 × 6 mm (2306)	DYS product page
Weight	34.53 g (DYS’s photo shows it weighed with its leads)	DYS product page
Dimensions	φ28.5 × 17 mm without the shaft; 31 mm tall with it	DYS product page, DYS drawing
Shaft	5 mm, threaded for the top 10.5 mm; it stands 14 mm above the bell (14 mm is the drawing’s 31 mm overall height less the 17 mm body)	DYS drawing
Mounting	4 × M3 holes on a 16 mm circle (16 × 16 mm)	DYS drawing
Idle current	1.6 A (at 16 V; 1.8 A at 20 V; the same for the 1750KV)	DYS product page

Bench data

Redrawn from DYS’s test reports. Thrust is static pull on a bench, more than you get in flight. Power is volts × amps; efficiency is thrust divided by power.

1750KV2 props

Prop	Current (A)	Thrust (g)	Power (W)	Efficiency (g/W)
7×4Eat 20 V	1.7	200	33.2	6
	17.9	900	358.4	2.5
	26.5	1,250	530	2.4
7×4Eat 16 V	1.93	200	30.9	6.5
	18.1	900	289.6	3.1
	21.8	1,050	348.8	3

Source: DYS product page

2500KV4 props

Prop	Current (A)	Thrust (g)	Power (W)	Efficiency (g/W)
6040×2at 20 V	1.6	200	31.4	6.4
	14.4	900	287.4	3.1
	35.2	1,580	703	2.2
5045×2at 20 V	1.8	200	36	5.6
	16.7	900	334.2	2.7
	32.8	1,480	656.6	2.3
6040×2at 16 V	1.88	200	30.1	6.6
	15.91	900	254.6	3.5
	30.08	1,327	481.3	2.8
5045×2at 16 V	2.68	200	42.9	4.7
	19.98	900	319.7	2.8
	24.06	1,031	385	2.7

Source: DYS product page

Inside the motor

A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:

Shaft. 5 mm, threaded for the top 10.5 mm; it stands 14 mm above the bell (14 mm is the drawing’s 31 mm overall height less the 17 mm body). (DYS drawing)
Stator. The coils are wound on a stack of thin steel laminations: 23 × 6 mm (2306). (DYS product page)
Base. 4 × M3 holes on a 16 mm circle (16 × 16 mm). (DYS drawing)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2500KV version reaches about these speeds; a prop loads the motor and brings it down, typically to around 70–75% of these figures at full throttle.

Battery	Volts	No-load rpm (KV × V)	Electrical frequency	ESC steps per second
4S nominal	14.8	37,000	4,317 Hz	25,900
4S full	16.8	42,000	4,900 Hz	29,400
6S nominal	22.2	55,500	6,475 Hz	38,850
6S full	25.2	63,000	7,350 Hz	44,100

A 14-pole rotor has 7 pole pairs, so every turn of the shaft is 7 electrical cycles, and a six-step ESC switches the phases 42 times per turn.

About the 3D model

A generic outrunner drawn from DYS’s published sizes: the 23 × 6 mm stator, 28.5 mm bell, 17 mm height, 5 mm shaft and 16 mm mounting circle. Anything DYS doesn’t publish is typical for a motor this size, and the bell’s spoked top, the base and the inside are a generic design, not this motor’s. The colours are read off the maker’s product photos. There are no logos or markings: it is our drawing, not the maker’s.