Dornier Do 29
... that the propellers of the Dornier Do 29 could be tilted downwards by up to 90 degrees?
... that the <a href="./Propeller" id="mwDa8" rel="mw:WikiLink" title="Propeller">propellers</a> of the <b id="mwDbA"><a href="./Dornier_Do_29" id="mwDbE" rel="mw:WikiLink" title="Dornier Do 29">Dornier Do 29</a></b> could be tilted downwards by up to 90 degrees?