On Sat, 20 Feb 2010 00:46:03 +0000 (UTC), Frank Stutzman wrote:

I had one owner explain to me that the tail on the Mooney was indeed
faster as the tip vortices ended up coming off the bottom of the
vertical stablizer.

But a vertical stabilizer is not going to generate a tip vortice.
(disclaimer: as far as I know)

The vortices are generated by unequal pressure on opposing sides of an
airfoil. A vertical stabilizer in coordinated flight would have equal
pressure on both sides of the surface, thus no vortice.

--
Dallas