Model type: Semiscale aerobat
Skill level: Intermediate to advanced
Wing area: 840 square inches
Wing loading: 17. 8 ounces
Wing cube loading: 7. 4
Length: 49. 3 inches
Weight: 7 pounds
Power system: 525 Kv 50-size brushless
Radio: Full-range six-channel
DSM2/DSMX radio system
Covering/finish: Paint and decals over Z-Foam
Street price: 399.99
TEST-MODEL DE TAILS
Motor used: E-flite 50-size brushless motor (included)
Battery: E-flite 6S ( 22.2-volt) 4,400 mAh LiPo
15 x 5. 5 two-blade (included)
Radio system: Spektrum DX-18G2
Ready-to-fly weight: 6 pounds, 8 ounces
Flight duration: Five minutes
• Fantastic-looking, detailed color scheme.
• Unique pin system makes wing installation easy.
• Very aerobatic and fun to fly.
• Top hatches for convenient battery and radio system access.
• Main landing gear fairing didn’t align
with fuselage on my model.
AT A GLANCE ...
All control surfaces use ball links for a slop-free
control system. The square elevator joiner, shown
here, ensures perfect alignment of the elevator
halves. You can also see the carbon-fiber strips
embedded in the foam to prevent flexing
while under load.
like most of those produced by
E-flite, is excellent. The paint job on the
foam appears to be applied well, and the decals
don’t look like they will fall off at the slightest touch,
like some foam models do.
There are a couple of areas that require glue and I used Zap brand
thin and medium CA. A Phillips-head screwdriver and CA adhesive
are all that you need to assemble the Prometheus. A six-cell battery
and a six-channel radio are required if you purchased the BNF
The first assembly step is to install the main landing gear. This
is where I ran into my only area of frustration. The main landing
gear comes as an assembly from the factory with the wheels, wheel
pants, and the fuselage fairing built up for you. With a few drops of
medium Zap adhesive, the faux exhaust pipe is glued to the landing
gear fairing. I didn’t want to stain anything by spraying kicker, so I held
the exhaust in place for a minute until the CA cured.
I aligned the gear assembly in such a way that the fairing was flush
with the bottom of the fuselage. The landing gear is bolted in place
with four Phillips screws, but I couldn’t get the screws to catch the
threads of the blind nuts in the fuselage. I pushed one of the screws
through and visually lined up the screw. This time it grabbed, so I
installed all four screws, but I realized that the fairing wasn’t properly
aligned. I removed the gear and carefully cut the fairing loose, put
the gear back in place with the four screws, and reglued the landing
gear fairing to the aluminum gear strut with medium Zap so that
everything was properly aligned.
The rudder is installed next using CA hinges. I was careful with
the thin Zap CA glue to prevent making a mess. After the rudder is
hinged, the tail wheel slides into place on the bottom and is held there
with a plastic plate that is secured with two small screws.
Because it was time to install the rudder pushrod, I went ahead and
bound the AR636 receiver to my DX18G2. The control linkages all
use Z-bends on the servo end and ball links on the control surface.
With the radio on, I sized the rudder pushrod and snapped the ball
link in place.
The elevators are prehinged to the stabilizers. Each stabilizer has
a carbon-fiber wing rod and the elevator halves connect via a square
joiner rod. One digital servo has plenty of torque to drive both
elevators, and the square joiner means that both halves will end up
perfectly aligned. The stabilizers slip into place and are retained by
two Phillips-head screws. The elevator pushrod is rigged in the same
fashion as the rudder.
Install the bottom wing next by sliding the bottom wing halves
onto the carbon-fiber joiner rod. The hardest part about this step
58 Model Aviation SEP TEMBER 2016