A 700 heli with 600 class powerplant?
Yes, a machine with small rotor disc load and overall contained operating costs (compared to other 700’s)!
The conversion to FPV platform was obviously out of question since I got the kit in the house and the results were exactly what I was looking for: 700 class “feeling” on the controls with excellent speed to altitude conversion capability (huge loops and stall turns), possibilty to share batteries with other 600’s I have and, finally, cool look.
Some details/pics of the build:
Swashplate actuators: Savox SC1256TG
Tail rotor actuator: Futaba BLS251
Flight controller: CUAV v5 Nano (needs upgrade 
)
GNSS receiver: Holybro M8N
Motor: Egodrift 4025HS 1050kV
ESC: HW Platinum V5 120A
FPV compartment: DJI AirUnit
For the FPV bay I had to get a bit creative, being a very lightweight and compact frame there isn’t much space available to install additional equipment:
The AirUnit mount is 3D printed out of ABS material, while antenna supports are 3D printed with carbon-filled nylon filament (being prone to resonant behaviors during run-ups, a bit more stiffness and strength was required here).
I also had the honor to test @bnsgeyer new autotune on this platform, which I have to admit, saved a lot of time in the initial tuning phase. A total of 3 flights (about 6-7 minutes each) were required to have pitch and roll axis rate controllers tuned to an excellent point. It normally takes me about 10 flights to come to something acceptable, so a huge improvement!
Here’s a footage of the auto-tuning sequence:
After the autotune, only minor adjustments were required to “match” my FPV flight style :
Outstanding performance also in Auto flight mode:
