RE: PBY-5A Catalina ?
Just for the small versions (~130cm): We had several at a meeting two weeks ago, which flew well. I made my first flight with mine and it ROW just fine. One model had even retractable landing gear and floats and flew fine, too.
PAF also had a ca. 200cm(or a bit more) version there which made a ROW with half power just fine.
Everything electric !
RK