If you want to lower stall speed and improve low speed handling, the easiest way
to do it is by adding VG's along the entire span of the wing, if you have not
seen my VG demonstration video, you can watch it here.
http://www.youtube.com/watch?v=EjI7-kBptrA
Your idea of extending the wing is also a very good one for lowering stall speed
and improving low speed handling. In the Titan Tornado SS, extending the wingspan
4 feet actually INCREASED the airplanes cruise speed as the wing flew at
less angle of attack with the longer wing than it did with the shorter wing,
creating less induced drag. Increasing the wingspan by 4 feet also worked well
to improve the slow speed handling of the Tornado SS. Properly designed wingtips
will also decrease stall speed. If it were me, I would do all of these
things. I have been considering adding two feet to each wing of my MK III
Xtra and using the new Kolb wingtips, I am just not ready to stop flying my
Kolb for the amount of time it would take me to do this work...
As far as where to lengthen the spar, you most definitely do not want to do it
on the inboard section of the wing, the forces at the inboard section are many
times greater than at the wingtip, resulting in a much higher chance of catastrophic
and sudden wing failure if you do not do a perfect splice.
Good Luck,
Mike
--------
"NO FEAR" - If you have no fear you did not go as fast as you could
have !!!
Kolb MK-III Xtra, 912-S
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