For reference, thrust is roughly double at the surface of Eve and about 15-20% on the surface of Duna (which is more than sufficient for takeoff given the low gravity and a large enough wing). My test plane could get up to 8km on Duna and about 17km on Eve. A warning though: you will not get up to high speeds with these propellers--I have yet to break 100m/s outside of a dive, although I suppose with enough engines it could be done.