Hi Richard,
Yes.
When I was based at latitude 41N and had a 4500 concrete runway at
sea level, I never used flaps for T/O. Never had a performance issue, but I
will admit to not carefully collecting flight test data on take off run. Sadly,
my BlueMountain data logging feature was discontinued in my G4 making
new collection more onerous.
At latitude 33 where the average temp feels 20F warmer, more humid,
and starting at 900' AGL, my habit is to use a small amount of flap on
my grass strip. Recall that with our flaps, lift increases in the early part
of travel and less in the late travel whereas drag increases mostly in the
late travel. Without flight test and therefore only my opinion/experience
5 - 10 of flaps increases lift (and minimally at t/o speed, induced drag)
and minimally increases form drag. Perhaps at half flap the lift is maxed
out without too much extra drag, I would think at 19 you are getting
more drag without much more lift. My strip is far too rough to take careful
measurements, but perhaps Europa could try a wee bit of CFD since they
have the form data and the software.
Cheers,
--------
Ira N224XS
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