Ralf Bronnenmeier wrote about the use/applicability of a tail strake for his Lancair IV-P.

Ralf,

I just got my IV-P flying this summer and have about 120 hours on it now. I’ve found the directional stability and rudder authority to be very good with the existing fin/rudder, and (IF YOU ARE INSTALLING A PISTON ENGINE) would recommend against these for a couple of reasons: These add weight in the rear, and you will likely have a tail-heavy airplane that effectively limits your max gross weight to stay within the CG limit. Second, the tie down built into this assembly can’t possibly be as strong/well tied into the fuselage as the Lancair-specified one.

If you are building a turbine-powered airplane, the situation may be very different. Some of the turbine builders will likely comment on this?

Bob