Model type: Sport/Pattern ARF
Skill level: Intermediate to advanced
Wingspan: 62 inches
Wing area: 748 square inches
Airfoil: Fully symmetrical
Length: 57. 5 inches
Weight: 7 to 8. 5 pounds
Recommended . 60 two-stroke, . 91 four-stroke, or
power system: electric equivalent
Needed to Radio system with five servos (four for
complete: electric); power system
Construction: Balsa and plywood
Radio system: Tactic TTX850 transmitter; Tactic TR625
receiver; five tactic TSX25 servos;
Futaba Y harness; several 6-inch servo
Power system RimFire . 80 and Castle Creations Phoenix
used: Edge 75 ESC; O.S. 65AX two-stroke
Flying weight: 8. 25 pounds electric; 7. 75 pounds glow
Flight duration: 13 to 15 minutes electric; 10 to 12
• Easily set up for electric or glow power.
• All control surfaces are prehinged and glued from the
• Plug-in wing halves and removable tail surfaces make
storage and travel a breeze.
• Assembly requires no glue except for electric motor box.
• Includes all required hardware.
• Nose gear assembly screw was stripped.
With the exception of the wooden electric motor box parts,
everything you see here bolts together. If you build the Kaos as
glow-powered airplane, you won’t need a drop of glue.
The amazing part to me is that with the capability of snaps,
spins, rolls, etc., when you come back on the throttle, it settles
down and flies like an advanced trainer. It putts around the sky
at low speeds, without danger of snapping or stalling. Setting
up for landings is like flying a trainer, because it will simply
float down and give you a perfect main-gear touchdown,
providing you flair at the right time.
Comparing the glow experience is interesting. Although
they don’t fly with the same propeller, both powerplants used
the same size APC propeller—the 13 x 8E with the RimFire
and 13 x 8 on the O.S. 65AX.
After I had had done some bench running on the O.S.
65AX to set the needles and get a decent idle, it was up in
the air again. The flight characteristics are the same, with the
exception of the vertical performance. The RimFire setup will
easily outpull the 65AX, because the glow version will give
plenty of vertical, but not unlimited vertical. Besides that, the
two power systems don’t “feel” that much different.
Of course, there are the obvious differences, such as bringing
the extra support equipment for the glow version (starters,
fuel, pumps, etc.) and the cleanup afterward. Then there are
the things that you really do miss such as the smell of burning
glow fuel, which always brings back memories, and that thin
trail of exhaust when the engine’s running slightly rich.
You can’t go wrong matching the Tower Hobbies Kaos 60
GP/EP with either powerplant. If I had to choose one, I’d
probably go with the electric, just because of the simplicity
and the slightly longer run times with a bit of throttle
management ( 13 to 15 minutes for electric; 10 to 12 minutes
with glow), but I had just as much fun with the 65AX engine.
Regardless of what’s powering the Kaos, this model is exactly
what it should be—a Kaos. It’s a great-flying machine that
will fly hands off when properly trimmed. It’s just as at home
flying Pattern maneuvers, everyday sport flying, or just cruising
around the field. Tower Hobbies has done a great job of not only
bringing back this legend, but also updating it in a few key areas.
One last thing—you might not have seen much reference
to gluing in this review. With the exception of the electric
motor box, nothing requires glue. Many modelers might call
this sacrilege, but it is an important note, and makes the Kaos a
quick turnaround from the box to the sky.
Kaos manual and addendum
68 Model Aviation JANUARY 2016 www.ModelAviation.com