FlyFish Flash 1804

What it pulls

FlyFish’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.

What you get for $15.90

• 695 g on 6S

  On FlyFishRC’s 24 V bench the 2450KV pulled 694.9 g at full throttle on an HQ T4 × 2.5 × 3, drawing 15.48 A.

  Source: FlyFishRC datasheet

• More than a 1404 or 1504

  FlyFishRC says it gives more power and thrust than 1404 and 1504 motors while staying compact.

  Source: FlyFishRC product page

• One-piece 7075 bell

  A Unibell in 7075 aluminium, a high-strength steel shaft and a thickened base.

  Source: FlyFishRC product page

• NMB bearings, N52SH magnets

  NMB bearings, N52SH heat-resistant magnets and copper wire rated to 220 °C.

  Source: FlyFishRC product page

What to pair it with

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

ESC

FlyFishRC’s 10-second peaks are 15.48 A (2450KV on 6S) and 20.73 A (3500KV on 4S); an ESC rated above those covers either version. (FlyFishRC datasheet)

Props

On about 24 V the 2450KV pulled 694.9 g on an HQ T4 × 2.5 × 3 and 585.1 g on an HQ 76 mm tri-blade; on about 16 V the 3500KV pulled 651.3 g and 553.55 g. (FlyFishRC datasheet)

Battery

6S for the 2450KV, 4S for the 3500KV. (FlyFishRC product page)

Frame

Four M2 holes on a 12 mm circle (12 × 12 mm); FlyFishRC designed it for 3.5-inch frames. A hardware set comes in the box. (FlyFishRC product page, FlyFishRC datasheet)

Where to buy

• FlyFishRCthe maker’s store; same price for both KVs
  $15.90seen Oct 19, 2026
  Visit
• RaceDayQuads2450KV
  price on the store’s page
  Visit
• Pyrodrone3500KV
  price on the store’s page
  Visit
• WREKD2450KV
  price on the store’s page
  Visit

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

Full specs

Bench data

Redrawn from FlyFish’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. One piece of 7075 aluminium (FlyFishRC’s Unibell), φ23.8 mm, black. (FlyFishRC product page)
• Shaft. High-strength steel, 1.5 mm. (FlyFishRC product page)
• Magnets. N52SH heat-resistant magnets. (FlyFishRC product page)
• Winding. Copper wire rated to 220 °C; 22 AWG leads, 150 mm. (FlyFishRC product page)
• Bearings. NMB. (FlyFishRC product page)
• Base. Thickened, with four M2 holes on a 12 mm circle. (FlyFishRC product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2450KV 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 FlyFish’s published sizes: the 18 × 4 mm stator, 23.8 mm bell, 13.5 mm height, 1.5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything FlyFish 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. FlyFishRC: Flash 1804 2450KV 3500KV Freestyle Motor (product page on FlyFishRC’s store). Retrieved Oct 19, 2026.
2. FlyFishRC: Flash 1804 Motor (Black) datasheet: spec table, product drawing and test report for both KVs (image on the product page). Its spec table lists 25.2 V and 16.8 V; the test rows read 23.9–24.2 V and 15.7–16.1 V.. Retrieved Oct 19, 2026.