Take a look at skyflytech.com They have a hybrid drone/canard design which is VTOL/STOL and achieves the efficiency of wings for distance flying. The propellers

Take a look at skyflytech.com They have a hybrid drone/canard design which is VTOL/STOL and achieves the efficiency of wings for distance flying. The propellers are angled at 45 degrees so no complicated tilting mechanism needed. Could be interesting for a clean sheet design.