In our "Classic era" campaign, the only aircraft player-characters have seen usefully employed are Project conversions of the Helio Super Courier (more specifically, the U-10D military version).
The Project in our campaign wanted an un-threatening aircraft that didn't need much in the way of runways, and less maintenance than a big cargo helicopter.
The engine on a Super Courier weighs 226 kg dry ...
Our stats:
http://asmrb.pbworks.com/w/page/1296...nsport%20Plane
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Michael B.