[winkeltripel]

Unless it has a large (>1) power to weight ratio.

[u320]

You still need airflow over the wings to turn it up to allow the propeller to produce lift. Unless you are flying a V-22 Osprey

[mlyle]

Or you could have a tail-sitter... but I thought none of these were necessary points to mention.

[pfdietz]

You mean thrust to weight ratio?