Henning,

I have completed some flights with the V4 and the D3 ESC and the 18SZ transmitter. Falcon 23x20F and 23x22R, Pyro 600-970, Allure @ 4550g with TP5000s.

The endpoints for the throttle are set at 120% on the low (1193us) and 109% on the high (1980us). 114% on the high will show 2000us, but I am using 109% to allow some overhead for the governor to keep the maximum power the same at the end of the flight when the battery voltage has dropped. I tried to make all curves close to the same power with the throttle stick in the middle position, so it is easier to change between curves without causing a sudden change to the motor power.

Takeoff Landing throttle curve
I use a 3 position switch to makes small changes to idle speed on the throttle AFR curve.
990us (zero RPM).
1193us (slow idle). Futaba “rate” on the mixing curve is -65, and this is for sitting on ground with props spinning.
1243us (fast idle). For landing pattern – sometimes I change to slow idle (1193us) just before landing.
1980us (full power). Futaba rate is +100.
Advancing throttle curve has delay of 24 (about 4 seconds).
Reducing throttle curve has delay of 21 (about 3.5 seconds).

Normal throttle curve.
1652us (low power), rate is +29.
1980us (full power), rate is +100.
Advancing throttle curve has delay of 22.
Reducing throttle curve has delay of 20.
Because the throttle is moving over a much smaller range, the time it is taking to go from lowest to highest throttle in this curve is about 0.8 seconds, and about 1 second.

Spin throttle curve
1213us (medium idle). Futaba rate is -61.
1980us (full power). Futaba rate is +100.
Advancing throttle curve has delay of 24.
Reducing throttle curve has delay of 21.

Stall Turn throttle curve
1243us (fast idle). Futaba rate is -55.
1980us (full power). Futaba rate is +100.
Advancing throttle curve has delay of 21.
Reducing throttle curve has delay of 20.

With this setup, the throttle response is quite crisp at all times in the air - the D3 is extremely powerful. Under some flight conditions, it is possible to have a prop "buffeting" sound if the throttle is reduced too quickly. I believe this sound comes from the relative prop disc RPMs getting very slow. Once this happens, blipping the throttle will bring the RPM back up, and the buffeting sound goes away. The buffeting can also be avoided by using a higher RPM for low power (also reduces maximum braking), or increasing the delay time when reducing the throttle (makes the throttle feel sluggish to me). It definitely took quite a few flights to get the overall throttle feel I wanted in the air, and it is definitely different than flying a traditional ESC. Some pictures are attached to show the shape of the throttle curves.