VTOL Duo Tailsitter config


I just want to build a VTOL Duo Tailsitter (Caipiroshka Duo Tailsitter). Can anybody tell me how to config the Autopilot orientation parameter (Pixracer) when the Pixracer is mounted with the arrow to the front of the Tailsitter (like in an “normal” airplane)?
Second question. Do I have to do the accel calibration in the way that pitch and roll are zero when the Tailsitter is in hover flight position or fixed wing flight position?

Thanks a lot

QGroundControl should show you a box to choose the orientation when you do the calibrations. Did you see these?
Otherwise, it’s this parameter:

Now that’s an interesting question :thinking:. @tumbili @dagar?