Yes, switch the leads and turn the prop over (if it is
a folder you have to turn the blades around).
There are two reasons for the pusher installation:
Crashability improves with pushers and the correct CG is tricky
to attain with a tractor propeller installation on swept flying
wings. Thirdly, not least important it is propeller friendly if the
battery is in front of the propeller in a crash!
Probably, but not certain, is that a pusher prop is slightly less
effective, while a pusher installation is slightly more efficient.
Sounds weird? Yep, but the flow over the wing interferes with
the propeller, making it less efficient, while the twisting
highspeed flow behind a tractor propeller very well can upset
the flow over the wing, thus a pusher can both be better and worse
at the same time! I bet a tractor is slightly better at low speed
and a pusher is better at high speed, as at high angles of attack
the flow behind the wing is very twisty and irregular - while the
flow in front of the model - in such a situation - is much less
affected, thus the tractor has an advantage.
At low Cls the flow is much more even and the lack of a propeller
upsetting the flow over the wing pays handsomely! All full-size aircraft
with push-pull installation (Cessna 337, Dornier Pfeil, et cetera)
have flown faster on their rear props than on their front ones :-)!
But I doubt they would take off better on just their rear ones
than their front ones - if it ever have been attempted!
Tord,
Sweden
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Tord S. Eriksson, Ovralidsg.25:5, S-422 47 Hisings Backa, Sweden
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