T-Motor F40 Pro IV 2306.5

What it pulls

T-Motor’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.

What you get for $25.90

• 9% lighter than the F40 PRO III

  T-Motor says it cut weight in every part: the silicon steel sheet (1 g), a 12 mm titanium shaft (0.2 g), custom silicone leads (0.3 g) and pinholes inside the motor.

  Source: T-Motor product page

• About 1.9 kg on 6S

  At full throttle on a T5150 the 1950KV pulled 1902 g at 43 A from about 23.5 V; the 2400KV pulled 1448 g at 42.9 A from about 15.5 V.

  Source: T-Motor test report

• Interlaced ribs

  T-Motor says the interlaced ribs of the top and a new base design make it more durable, and shows a 100 N impact simulation of the bell.

  Source: T-Motor product page

• Three colours

  Sold with a blue, grey or red top on a dark grey bell.

  Source: T-Motor product page

What to pair it with

Our reading of T-Motor’s numbers, so your build matches what the motor was tested with.

ESC

Peak current over 60 s is 42 A for the 1950KV and 42.9 A for the 2400KV. T-Motor's full-throttle results were taken with its F45A ESC. (T-Motor drawing and specs, T-Motor product page)

Props

T-Motor benched it on its T5146, T5147 and T5150 tri-blades; at full throttle on 6S the 1950KV pulled 1768 g, 1857 g and 1902 g on them. (T-Motor test report)

Battery

4S–6S for the 1950KV, 4S for the 2400KV; T-Motor tested them at about 24 V and 16 V. (T-Motor drawing and specs, T-Motor test report)

Frame

5-inch racing and freestyle quads, per T-Motor. Four M3 holes on a 16 mm circle; T-Motor says the mounting holes are shaped to match frame arms. (T-Motor product page, T-Motor drawing and specs)

Where to buy

• T-Motorthe maker's store (Tmotorhobby); 1950KV with a grey, red or blue top, same price
  $25.90seen Oct 19, 2026
  Visit

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

Full specs

Bench data

Redrawn from T-Motor’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.

Inside the motor

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

• Bell. 27.9 mm across, dark grey, with a five-spoke star in the top round a knurled hub; the spokes' cut edges show silver. (T-Motor drawing and specs, T-Motor product page)
• Shaft. Titanium, standing 12 mm above the bell, with an M5 thread; 5 mm on the drawing, 4 mm in the spec table. T-Motor says its custom prop nut protects the thread. (T-Motor product page, T-Motor drawing and specs)
• Base. Grey, with four M3 holes on a 16 mm circle; 20 AWG silicone leads, 150 mm long. (T-Motor drawing and specs, T-Motor product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1950KV 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.

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 T-Motor’s published sizes: the 23 × 6.5 mm stator, 27.9 mm bell, 17.8 mm height, 5 mm shaft, 16 mm mounting circle and 12 teeth and 14 magnets. Anything T-Motor 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.

Sources

1. T-Motor: F40 PRO IV 2306.5 product page on its Tmotorhobby store (description, feature images, product photos, price; drawing, spec tables, test report and contents are images on the page). Retrieved Oct 19, 2026.
2. T-Motor: F40 PRO IV product drawing and spec tables for 1950KV and 2400KV, two images on the product page (S1) starting with this one. Retrieved Oct 19, 2026.
3. T-Motor: F40 PRO IV test report, five images on the product page (S1) starting with this one, the last with the contents: 1950KV and 2400KV on T5146, T5147 and T5150 tri-blades, 50% to 100% throttle in 5% steps. Columns as T-Motor gives them: thrust in g, voltage measured per row, current, RPM, power, efficiency; motor surface temperature after 1 min at 100% throttle, ambient 30 °C. Retrieved Oct 19, 2026.