Wing tip undercarriage because main undercarriage is bicycle type?
N'est ce pas? Aircraft too difficult to handle at high speed on ground with narrow track main undercarriage - as with the Harrier?
Actually reason given also seems good, but even if tip droop (I sometimes suffer from this

) is a factor, controllability seems likely to be another.
Last edited by 911slf; 22nd December 2011 at 12:15.
Reason: after thought