Precision Aerobatics Katana MX
The KMX offers ample room to accommodate your electronics. One of the two batteries is located as far forward as possible to achieve the perfect center of gravity.
Senior technical editor Gerry Yarrish and longtime contributor Craig Trachten look
over the aircraft before its maiden flight.
manual you’ll be rewarded with an excellent airplane.
The control pushrods may need to be
cut with a rotary tool cutting wheel for a
precise fit and perfect geometry. Precision
Aerobatics also suggests hard mounting
each of the servos to the airframe. It is rec-
ommended that you don’t use the rubber
grommets and eyelets that are included
with the servos, as they can cause excessive
flex in the servo under high-load condi-
tions. I haven’t seen any issues with this
technique, but be sure to harden each of
the screw mounting holes with thin CA.
Vortex Generators: Performance you can feel!
Though you might think that vortex generators (VG) are just another neat bit of “bling” to add to
your airplane for increased eye appeal, the carbon-fiber CNC cut VG accessory packages from
Precision Aerobatics are indeed worth the effort of installing them on your Katana, or any other PA
aircraft. The Katana MX vortex generators ($17.95) are easy to install in pre-cut slots in the wing
leading edges and the wingtips. Once glued into place, the smaller VG tabs and the end plates help
delay flow separation and aerodynamic stalling, helping improve wing efficiency. The VGs greatly
improve flight characteristics at high angles-of-attack (AoA) and improve stability during 3D and
knife-edge flight—especially at slow speeds. So, in addition to adding a cool, funky look to your
plane, the VG package also makes your airplane a great performer both upright and upside down.
By re-energizing the boundary layer, the wing just keeps on hanging in there. The benefit is that
you can fly at four to five degrees more in AoA, and the wing continues to produce lift. With the
increase in efficiency, your ailerons will remain effective and you can actually feel the difference.
the carbon-fiber pushrods. I used small
hobby cotton swabs soaked in denatured
alcohol to thoroughly clean the inside.
Once satisfied, be sure to cut the control
rods to the exact needed length with a
rotary cutting tool, groove the edges for a
better grip, and finally epoxy each rod into
its respective control arm and servo arm.
Be sure the rod is seated all the way to the
end of each receiving clevis. You’ll also find
the use of a miniature round file extremely
useful for getting the servo arm and con-
The lower cowl has a large cooling exhaust opening
and the gear is strong enough to handle the toughest
landings and runway surfaces.
trol arm holes to be the perfect size.
As mentioned, I found the build to be
very straightforward with very little modifications needed for a perfect assembly.
This little hot rod boasts all of the performance and precision of a large-scale airplane in a package that’s easy to assemble,
fly, and transport. Although it’s not for the
absolute beginner, the KMX can be assembled and flown by just about anyone with a
solid foundation of basic skills. It’s an absolute blast!