Today we are going to check out the RushFPV Blade Stacks: F722 Analog / DJI Digital FC, Sport 50A / Super 60A 4in1 ESC, and power filter board. They can be bought separately, or together as a stack.
New to FPV? You can learn about flight controllers here, and ESC here.
Table of Contents
Rush Blade F722 Flight Controllers
There are two versions of the FC, the Analog and DJI Digital, designed for the different FPV systems.
Where to Buy Rush F722 FC?
Update (Jan 2023): there’s a new version – Rush Blade F722 FC V2!
Analog Version
- AliExpress: https://s.click.aliexpress.com/e/_DlTadlz
- GetFPV: https://oscarliang.com/product-xr0x
- Amazon: https://amzn.to/3UsATWq
DJI Version
- GetFPV: https://oscarliang.com/product-wlzi
- RDQ: https://oscarliang.com/product-wy0t
- AliExpress: https://s.click.aliexpress.com/e/_DDkwnin
- Amazon: https://amzn.to/3UlAo08
They come with a bunch of cables for the different FPV system, and for 4in1 ESC in case you want to use a different brand (different pin-out). There are plenty of options when it comes to soft mounting (different sizes of rubber grommets/spacers).
Specs and Features
Both FC versions have almost the same set of features:
- STM32 F722 processor
- MPU6000 Gyro
- 6x motor outputs
- 5x UART
- 1x I2C
- BMP280 Barometer (Digital version only)
- 16MB Flash Memory for Blackbox
- Input Voltage: 7V to 40V (up to 8S)
- 30.5×30.5mm mounting holes
- Weight: 8.5g (analog), 9.5g (DJI)
- Dimension: 36.5x38x5.2mm
- BF targets: Rush_Blade_F7 (analog), Rush_Blade_F7_HD (DJI)
Close Look
The Digital version is designed specifically for the DJI FPV System. It has a dedicated 10V 3A BEC (alongside a 5V 5A BEC) for powering the Caddx Vista or DJI Air Unit. You also get the cable that connects directly to the Air Unit without soldering anything.
With the Analog version, there is only a 5V 5A BEC, and you get the cables that connect directly to the analog FPV camera and VTX. If you are using one of the Rush VTX, it’s plug and play, no soldering at all.
Note that the Analog version has the Betaflight OSD chip, but the Digital version does not. This means you should not buy the Digital version if you plan to use Analog FPV system, as Betaflight OSD will only work in DJI FPV system.
Here’s the included manual with wiring diagram.
Those 5V and 10V BEC are some of the beefiest I’ve seen on an FC. You can choose what voltage you want to use to power your FPV system and receiver by bridging the solder pads.
If you don’t like using cables, you can also direct solder your wires to the pads on the bottom side of the board. The solder pads are well sized and easy to work with.
Rush Blade 4in1 ESC
There are two versions, Sport and Super Editions.
Where to Buy?
50A Sport Edition:
- Banggood: https://oscarliang.com/product-krsr
- GetFPV: https://oscarliang.com/product-ac4k
- RDQ: https://oscarliang.com/product-q7hl
60A Super Edition:
- Banggood: https://oscarliang.com/product-yinc
- GetFPV: https://oscarliang.com/product-c8cj
- RDQ: https://oscarliang.com/product-l9l1
Both ESC give you the same accessories, including a 35V 470uF capacitor. There’s no XT60 pigtail provided, so make sure to get your own.
Specs and Features
- Firmware: BLHeli_32
- Current:
- Sports: 50A (60A)
- Super: 60A (80A)
- Mounting: 30.5×30.5mm
- Weight: 16.2g (Sport), 16.5g (Super)
- Dimension: 45×36.5×7.5mm
Close Look
Both ESC have “Metal Armour”, which are basically a layer of metal cover on both sides of the board. It improves cooling of the MOSFET and protection from physical damage.
Apart from current rating, the main difference between the two versions is the processor.
Although both 4in1 ESC run BLHeli_32 firmware and they are very capable, but the 60A version is the premium of the two as it has the faster STM32 F3 processor while the 50A version only has the F0. This means the 60A version can run at 96KHz PWM frequency while the 50A can only do up to 48KHz.
Originally BLHeli_32’s default PWM frequency was 24KHz and we found increasing it to 48KHz can generally improve smoothness and efficiency of our quads. So by doubling that to 96KHz can give you even more improvement in that aspect. You can learn more about ESC PWM frequency here.
Both ESC can take 6S LiPo battery. Onboard noise filtering is outstanding. Solder pads for motor wires can only be found on the top side of the ESC.
Rush Power Filter Board
You can purchase the Rush PFB (power filter boards) here.
They are made up of 3 high power TVS diodes and two “solid” 35V 330uF low ESR capacitors. The specs of the TVS diodes are not mentioned, but I’ve been told they are good for both 4S and 6S. They can provide extra protection against voltage spikes, similar to the FETTEC Spike Absorber but with two extra caps. This is especially useful for 6S builds where voltage spikes is more deadly and more likely to damage your electronic components.
Size: 33x10x13.5mm (with capacitors)
Weight: 4.5g
Simply solder them to the power of your 4in1 ESC (positive and negative).
For the Rush stacks, I don’t think this is necessary on 4S, at least that’s what I have experienced so far. The onboard filtration on those 4in1 ESC, and with the supplied capacitor, are totally capable of handing 4S. But if you are planning to run 6S on a powerful build, this power filtering module can be a great addition. Think of it as an insurance for any potential issue you might have.
Beware that the filter board is not small, and it can get in the way of some compact frames. Make sure you check the dimensions before buying.
18 comments
One thing I thought I might note for those looking at this stack, there’s an inline resistor on the VBAT input on the FC that is very prone to failing. I know of 3 people who’ve had them fall out of the sky and another 2 that’ve had it die when plugging in.
If your FC won’t work on battery but works on USB, that’s the likely culprit. I replaced mine with a higher current resistor an it’s been fine since. I don’t know if this has been fixed on their newer versions but I thought it worth putting out there for anyone googling or looking to purchase
high speed (~300km/h) VTOL Wing build, dual or multi cameras (hopefully at least two switchable FPV!) believe I want/need at least two air/wind speed sensors (pitot?), believe that pushes me to Ardupilot/copter/wing and therfore H7 to load from bigger RAM! Am I barking up the wrong tree? More than happy to pay for your input just tell me where/how much!
Does anyone know what the battery offset values are for the Balde Digital stack?
Hi there I need to know no what motor protocol I should use, but I can’t find it in any in the manuals for the blade F7 HD stack
You mean ESC protocol?
DShot600 if you are running 8K PID frequency, or DShot300 for 4K.
I have the analogue version, can I solder a 03 dji air unit instead of the analogue?
yes of course. you can connect it to any spare UART. The analog version has no 10V BEC to power the Air Unit, so you would either power the Air Unit directly from battery (more risky due to voltage spikes) or using an external voltage regulator (safer approach).
Hi Oscar, quick question, i have 50A Sport Edition and want to connect it with other F7 FC, on the ESC wiring harness there are two VBAT and two GND (10 pin total) and on my FC i have only 8 pins, so do i need to combine those two or can i unplug one of each from ESC harness?
It would seem.that there is no betaflight target for the blade fc, so watch out for that if you want to reflash for any reason.
The Betaflight targets do exist depending on which version of the FC you have: BLADE_F7 and BLADE_F7_HD. They has it mis-labeled it as RUSH_ BLADE_F7 and RUSH_ BLADE_F7_HD on the back of the actual FC boards.
Rush Power Filter Card:
Name of TVS diode: “GEZ” is actually an SMCJ24A (1.5kW, 24V).
it is indeed a good protection for a FC in 6S.
Thanks Oscar
There is some confusion with most of the online listings about the Rush Blade F722 FC (Analog version to be specific): There is no onboard barometer.
The Digital version of the Rush Blade F722 FC has an on-board barometer.
Currently there is no official iNAV target for the board either and so anyone who wishes to use this FC for iNAV will need to compile their own custom firmware. This might change in the future :)
Thanks for the clarification, yes, the label does say that on the actual FC.
have you compiled inav for digital version? i got one and having difficulty enabling barometer. :( any help will be appreciated.
Same problem with barometer. It doesnt work :(
Check option baro_i2c_device in CLI if you will have something like
# get baro_i2c_device
baro_i2c_device = 0
Allowed range: 0 – 5
use command set baro_i2c_device = 1
Hi Oscar,
I notice they also have a “Speed” ESC in the same range rated at 60 amps. Only difference seems to the the MCU is different.
Do you know when that would be appropriate over the Super?
I think it’s the 50A 96KHz version? RushFPV mentioned it but they said they currently have no stock of that model. Basically the less powerful version of the Super.