Outboard tanks, tips or not, increase the structural ability of the wing to handle sudden increases in lift. Tip tanks, if canted like the later 310's for instance, are thought to decrease tip drag.
The KR wing is strong enough that carrying fuel in the tips isn't relevant for strength issues, to my mind. And disturbing the tip vortice is more easily done than by building a fake tank. If someone wants to do it though, why not? Potential imbalance issues can be provided for easily. Mike KSEE ____________________________________________________________ Get Free Email with Video Mail & Video Chat! http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210
