Hi group,

There is a small company called Turbine Solutions located in Florida
that is in the process of designing and building an aftermarket rudder
extension / ventral fin kit.  It is based on the Columbia 400 design.
It extends the rudder downward several inches, the bottom of which
aligns with a ventral fin.  Currently my completed rudder is being used
to create this modification.  This kit will be available for sale within
3 or 4 months or so but only after extensive flight testing.  A very
experienced test pilot / aeronautical engineer has agreed to flight test
a IV with this modification however my IV will not be completed for at
least a year (and keep in mind I've been saying "a year" for about 3
years now).  So Turbine Solutions is willing to purchase a rudder, add
the extension and the ventral fin to a flying IV and pay for the
services of a test pilot to have it flight tested.  Anyone interested in
having their IV serve and test bed and receive an installed kit at no
cost to them please email me and I'll put you in touch with the proper
person.

Joe Trepicone IVPT