I converted my normally aspirated Lancair IV to a Turbine.  The airplane flew great before the conversion but with the turbine I experienced some attention getting tail wagging especially on take off in gusty conditions.  After a considerable number of failed attempts to correct this issue I bought a Mike Custard strake and installed it.  The strake eliminated my problem with no other modifications needed.

I highly recommend that you look at this solution.  I believe you will be most satisfied.

Sent from my iPad
Berni Breen
Bbreen@cableone.net

On Jun 27, 2011, at 6:34 AM, RONALD STEVENS <ronald@sdc.com> wrote:

> Hello guys
>
> Me again, I just had my first lesson with the Lancair 4p (with JC) and when I took off the plane was wiggling its tail like a happy dog LOL Nothing scary, but this I can imagine could be annoying for passengers.
>
> Now I was looking on the internet and found that Ventral Strakes  were used to fight against those 'yaw' effects.
> It suppose to help with turbulence, go-arrounds, full power take offs as well.
>
> My very near future plane (we are almost closing ;) is a newer one, so the tail section was already updated to the latest.
>
> But looking at my passengers (I fly with my Son and Girlfriend a lot) this could be disturbing for them and I was already thinking of installing the Yaw damper (I have the tru-trak sorcerer) and perhaps also installing those Ventral strakes.
>
> Does anybody have experience (before and after) with those? And would you recommend those?
>
> Thanks — Ronald Stevens (Cirrus 1100 hours, Velocity 250 hours, Lancair 4p student now with 1 hour LOL)