Interesting what a computer can say about shape changes on a aircraft. The B
model
Piper Aztec offered optional 22 gal tip tanks of a different shape to the
standard wingtip. It was said they were Hoerner wingtips.
With these Hoerner tips the Aztec would land a few hundred feet shorter and
cruise
5 mph faster. Similar but not the same as your Chamfered tips.
The Aztec had a non tapered planform and thus was full cord at wingtip, this may
have exaggerated the improvement. The comparison Aztec was a C model with
standard
round planform wingtips. Old memories.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511242#511242
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