R9M Fan Mod
Initially, this mod is brought to life by Niklas Voigt and Seba112PL as a beta tester and is still a work in progress.. if you have suggestions don't hesitate to contact.
Users have experienced temperature issues on R9M that degrades the link quality. We recommend you use the lowest power setting required for your flight and turn on dynamic power at all times (ELRS v2.0+)
It might seem counterintuitive, but using less power might help for longer flight times and more range by reducing the heat. ELRS does not require a lot of energy and looking at the long-range leader board
With this mod your R9M is still limited to 1W
You need a 20x20mm or 25x25mm fan in 5V version. Both sizes are supported. To secure the fan into the cover you can use 2x M2 screws, a thread is already in the print. U can solder the pins of the fan directly to the 5v port of the R9M or use the Controllable Fan Mod which can control the fan out of software (fan blows only at >250mw).
R9M Fan Mod Cover is built out of four Parts and a Sticker:
- R9M-Fan-Case-Standoff.stl (2x)
or from Thingiverse
Controllable Fan Mod¶
Additionally to the fan, you'll need one NPN Transistor (e.g.
2N4401) or N-Channel MOSFET (e.g.
BS170 has built-in Shotky-Diode) and a resistor (200-3k7)
R9M2019 Build notice¶
The PB9 pad location on the R9M2019 module is a bit different. Please see the photo.
Only do this if you are comfortable with modding hardware
In addition to the 3D printed Cover & the Controllable Fan Mod you'll need:
- Fan + Heatsink
"2507 25MM 25x25x13MM Hydraulic bearing Graphics card Cooling fan with heat sink 5V 12V m.2 SSD Fan with 2pin"
- Thermalpad 0.5mm
"1pc 100mmx100mmx0.5mm GPU Northbridge IC LED Chipset Heatsink Cooling Conductive Silicone Thermal Pad,100x100x0.5mm w/ 3.2W/M-K"
The screw heads are cut off to reduce height.
As you can see in picture 3, the 5v fan is connected to the power source of the module, so the fan is used with some overvoltage and spins with higher rpm... tested for a long time and should not be a problem for the fan. If you don't know how to allow the 2W in the firmware, don't do this mod!🤦♂️