Kit with hardware
Easy to build and repair
Superb Flying Performance
Durable Elapor Foam
Matched Power Set
Brittle Canopy Latches
Mentor is a replacement for the Magister and is a robust trainer
and tug (tow plane) made of ELAPOR (pronounced el-a-pore) foam.
Medium CA glue used with an activator (or kicker) as the only
method of gluing recommended by the manufacturer. This radio controlled
model is electric powered and Almost-Ready-to-Fly (ARF). It is
meant for beginners to intermediate fliers.
have been around since the very beginning of model flying. The
so-called .40-size trainer was offered in a multitude of variations
all over the world. The beginner is expected to cope from the
outset with an easily damaged all-wood model and a motor which
is not properly set up or even broken in. It was no surprise that
this type of "first model" was often the modeler's last.
Multiplex Mentor was designed with the beginner in mind. The ELAPOR
foam provides a robust, high-strength structure that is easily
and quickly assembled using CA glue. The aircraft's flying characteristics
are simply outstanding! When using the mating Multiplex Brushless
Motor Power Pack (M993228),
which contains a motor, ESC, Prop, and hardware, the trainer provides
reliable, maintenance-free power flight after flight.
Length: 46.1" (1170mm)
Wing Loading: 14.58 oz/sq ft (44.5g/sq dm)
Flying Weight with 3 LiPo Cells: 4.3lbs (1950g)
Airfoil: Flat bottom high-wing placement
Center of Gravity: 3.3" (85mm) Back from the wing's leading
edge at the fuselage
Elevator Throw: Up 0.59" (15mm), Down 0.47" (12mm)
The Mentor parts fit into a custom foam base that protects them during shipment. The well-designed packaging eliminates damage during shipment. The kit includes a large decal sheet, a detailed manual in five languages, and all the hardware needed for completion.
The mating Multiplex Brushless Motor Power Pack (M993228), contains a Himax HC3528-1000 motor, Castle Creations Phoenix 45-amp ESC, APC 11x5.5 e-prop, adapter, and mounting hardware sets.
assembly begins by gluing in the motor mount pieces. I was impressed
at how the plastic pieces fit perfectly into the foam mold fuselage
halves. A little medium CA on the fuselage inside and spray kicker
on the plastic pieces was all that I needed for a quick strong
the elevator and rudder, I'm using Hitec HS-475HB servos. These
are standard size servos with ball bearings and Karbonite gears.
Each servo weighs 1.41oz and has 61oz/in torque on a 4.8v supply.
They press into place on the fuselage and are held by a few drops
of glue. I cut away the outer holes in the servo arm so it would
fit in the servo compartment of the fuselage.
ailerons will use smaller Hitec HS-85BB "Mighty Micro"
servos. The servos weigh only 0.67oz each and deliver 42oz/in
torque on a 4.8v supply. The HS-85BB servo is meant to fit in
the smaller aileron compartments in the wing.
elevator and rudder control snakes are made from a thin metal
rod and an inner and outer set of tubes. The Z-bend of the rod
connects to the servo arm and the outer tubes press into the fuselage
after lining the channel with medium CA. I used Pacer Zap CA+
(PT-02) and Zip Kicker spray accelerator.
that the thicker control rod for the steerable tailwheel (which
does not use an inner tube) is crossed over the rudder control
rod at the servo arm. The cross-over is just another example of
the elegant German engineering that went into the Mentor. It is
simple and requires no fancy linkage hardware. There is no binding
because the Z-bends are a different size so the tailwheel control
rod rides over the other one.
wing screw supports snap together and then get CA'ed into the
installed the aero-tow mechanism. It was well designed and easy
to install. I used an older Expert SL300 Micro BB servo I had
on hand. Just about any micro-sized servo will work for this feature.
I decided cut the control rod later when I activate my receiver.
next step is to join the fuselage halves. I have found from assembling
previous Multiplex Elapor models that using medium CA and a spray
accelerator like the Pacer (PT-15) Zip Kicker makes this assembly
procedure quite easy. After first test fitting the two halves,
I applied CA to one side and sprayed kicker onto the other side.
You can then press the two halves together being careful not to
warp the fuselage tail in the process. It is helpful to do this
on the floor with towels under the fuselage so it can be compressed
with multiple hands. I finished this procedure by checking all
the seams and re-applying CA where needed.
tailwheel unit and main undercarriage are installed next. I assembled
them from the matching diagrams in the manual without issue. A
1.5mm hex wrench is needed to tighten the wheel collars. Be sure
that all wheels spin properly when finished and use Pacer Z-42
Thread Locker on all the nuts and hex head "grub" screws.
main undercarriage is installed with four M4x68mm flat head screws
into three of the thick plastic plates. The plates sandwich the
fuselage and provide a solid foundation for the gear mains. Everything
fit well and Pacer Z-42 Thread Locker was applied to the four
nuts that sit inside the fuselage.
Mentor Servo Pack:
Servo Pack arrived from Tower Hobbies. The pack consists of
two HS-322HD servos (for elevator and rudder) and two HS-81 servos
for the ailerons. It also contains the two 6" and two 12"
servo extensions needed to complete the Mentor.
first cutting the control surfaces free, the swivel pushrod
connectors are mounted to the control horns. The elevator and
rudder connectors use the outermost hole in the horn and the
aileron connectors use the second hole from the outside of the
horn. As with everything else on this model, the pushrod connectors
fit perfectly onto the control horns and the control horns fit
perfectly into their custom slots of the control surfaces. I
used a small dab of Zap Z-42 thread locker on the nuts of the
pushrod connectors to keep them in place.
stabilizers glued easily in place onto the fuselage. After first
testing the fit, I spread medium CA onto the fuselage area and
sprayed the stabilizer area with PT-15 Zip Kicker accelerator.
This made for a quick assembly as the stabilizers are easy to
center in position. The same technique was used to mount the
the pushrods were inserted into the swivel connectors and lightly
tightened for now. When the receiver is made active, I will
center the servos, adjust the pushrods, and tighten the grub
screws with a dab of Locktite.
aileron servo openings in the wing are perfectly designed for
Tiny S, HS-85, or HS-81 servos. They snugly press into place
with a small amount of CA to hold them. Since the servo arm
was not easy to unscrew after mounting the servo, I decided
to first center them with my live receiver and Rx. battery pack.
used Hitec (57345S) 12" Aileron Extensions to route the
servo wire to the center of each wing half. A small piece of
foam was cut in the wire channel to accept the joining cable
connectors. I used a small amount of CA to hold it in place
and then clear cellophane tape along the entire channel.
spar covers were installed with my usual CA and spray kicker
technique. The key here is not to get any CA inside the channel
where the carbon tube must slide.
Mentor Power System:
motor assembly begins by soldering the connectors on both
ends of the Castle Creations Phoenix 45 ESC. I did not find
any shrink tubing for the ESC motor wires so I used my own.
My battery connector preference is Dean's Ultra connectors.
The Himax HC3528-1000 motor came with the connectors already
on the wires.
Mentor motor bulkhead has an innovative adjustment for thrust
angle. I used the recommended starting points for right and
Mentor Power Set came with many parts that are not needed. I
wasn't sure if I had received a prototype kit or if the Power
Set was meant for multiple models.
complete bulkhead motor mount kit was included but not needed.
I only used the 4 motor mount screws in the X-mount kit. The
APC 11x5.5 prop, Multiplex prop adapter, and spinner adapter
are all used.
mounting the motor with the 4 screws from the X-mount kit, the
whole assembly is screwed into place from the front of the fuselage
nose. Note how easy it is to change the thrust angle by adjusting
placed my Hitec Electron 6 receiver and Multiplex ESC (CC Phoenix
45) in the recommended locations. When the battery is in the
back of the fuselage chamber (as suggested) the plane balances
perfectly! Note the gap in the fuselage at the center of the
wing leading edge. This is where the aileron control wires are
routed from the wing to the inside of the fuselage.
72MHz antenna wire is routed along the bottom of the fuse toward
the tail. I used clear cellophane tape to hold it in place.
Mentor was designed with exceptional air flow through the inside
of the fuselage to cool the motor, ESC, and battery pack.
measured the following static power setups. You can see that
for a little more money, you get 10% more power from the 30C
also has their own cost-effective 20C 3s 3200mAh pack.
Multiplex Mentor was Ready-To-Fly at 63oz (3.9lbs) including the
10-oz flight battery pack and extra tow servo.
tested the Mentor at a local schoolyard just down the street.
As expected, it flew very predictable and offered no surprises.
Take-offs required some rudder correction in the cross breeze
but it had plenty of power for basic aerobatics and could slow
down to a docile crawl around the field. I only needed only
a few clicks of elevator and aileron trim to keep it flying
straight. Landings were as simple as turning off power to the
motor and gently flaring the elevator as you watch it glide
onto the grass. My flights lasted for at least 10 minutes while
performing aerobatics. Using the 30C Flightpower 3s 3200mAh
pack provided a noticeable increase in power over my 20C pack.
maiden flight video of the Multiplex Mentor shows that it can
safely take-off and land in a smaller field like a school yard.
A young boy saw it fly and ran across the field to see where
the Mentor landed. He was mesmerized by the model that was as
big as he was, so, after unplugging the battery, we gave him
a transmitter to play with. His Dad told me that his father
used to have tissue and dope planes and he never knew this type
of foam plane and electric power existed. Perhaps the Mentor
has attracted a new pilot to our hobby.
maiden flight video was intended to be more realisitic of what
most people may do with a Mentor. It was flown safely because
I was in a school yard at the time, not a club flying field. This
second video shows more of the Mentor's capability at the club
final good weekend of the flying season to make a trip to the
club field came on November 2nd. My pilot, Lynn Bowerman, had
a chance to test out the Mentor while I worked the video camera.
As expected, he enjoyed it as much as I did and gave it a good
workout. All the take-offs and landings were using the same FlightPower
30C battery pack so we had at least 10 minutes of flying while
performing many aerobatics.
Mentor kit is more work to assemble than a Ready-To-Fly model
but can be built in just a few evenings. Although it does require
more than a beginner's knowledge to create a successful experience,
the result is a better choice for the intermediate or more serious
modeler. The brushless power system has plenty of power to fly
off grass and the forward landing gear virtually eliminates nose-overs
on rough terrain. Best of all, the Mentor can be quickly repaired
with CA and kicker right at the field!
the Mentor is extremely stable in flight, it can provide a relaxing
experience or perform all the basic aerobatic maneuvers including
inverted flight. The extensive flight envelope ranges from a very
slow pass to a fast knife-edge. As a successor to the popular
Multiplex Magister, the Mentor is similar in size but weighs 10oz
less. The steerable tail-dragger was designed from the ground
up for today's brushless motor and Lithium Polymer technology.
A great addition for all pilots!
The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.