Hello everyone,
I’m currently testing a VTOL in RealFlight Evolution. All basic flight modes work correctly - including QLOITER, QHOVER, QSTABILIZE, FBWA, CRUISE, and AUTO. However, when switching to RTL mode, I get the message: “Unable to start landing sequence”. The aircraft successfully returns to the HOME position, flies in circles at the correct RTL_ALTITUDE, but never starts the landing process - it doesn’t transition into Q_LAND or LAND mode as expected.
I have tested both cases:
- RTL without Mission (manual RTL only).
- RTL with Mission, including a proper “DO_LAND_START” command before the landing section.
In both cases, the system reports “Unable to start landing sequence”, and the VTOL simply circles around the home point without descending.
In addition, When I set RTL_AUTOLAND = 0, the error disappears, but the plane only circles at RTL altitude without landing. When I set RTL_AUTOLAND = 1, the message appears and it never starts the descent. Other modes such as AUTO TAKEOFF, QLAND, and QLOITER work perfectly.
I’d really appreciate if anyone could clarify the exact internal logic of how RTL decides to start the landing sequence, and how to ensure the VTOL transitions to Q_LAND automatically when returning to Home.
Thank you very much!