Our Recommendations - Model Tech Yak 54 Assembly Instructions Manual

This section describes our recommendations to help you in deciding which types of accessories to purchase for your new aircraft.
Please read through this entire section very carefully. We have provided you with recommendations that, if followed, will result
in a great flying aircraft. Failure to follow our recommendations may result in a poor flying aircraft.
The Yak 54 ARF can be flown using either a 1.00 to 1.35 size two-stroke engine or a 1.20 to 1.40 size four-stroke
engine. The aircraft will fly great using either type of engine within the recommended size range, although for
the best aerobatic performance, we suggest using an engine at the high end of the suggested size range.
For the best flight performance, we suggest trying to keep the ready-to-fly weight of the aircraft as light as possible.
Using an engine that's bigger than recommended will only add extra weight to the aircraft, negating any of
the extra power from the larger engine and increasing the wing loading. In most cases, you'll get better flight
performance from a lightweight but powerful engine, than from simply a higher displacement engine. We don't
suggest using an engine that's outside of the recommended size range.
Whether you're going to use a two-stroke engine or a four-stroke engine, the engine will be mounted on
its side. If you're using a two-stroke engine, you will need to use an after-market Pitt's style muffler
to direct the exhaust out the bottom of the cowl. If you're using a four-stroke engine, the exhaust
header on most engines can be rotated down to allow the stock muffler to exit the bottom of the
cowl, so no after-market muffler should be necessary.
servo for the rudder, and an Airtronics 9402z servo for the throttle. Both the ailerons and the elevator halves use dual servos*.
*If your radio control system is not capable of mixing the two elevator servos to move the same direction, the use of an electronic servo
reverser will be necessary.
There really isn't too much else that you'll need to finish your Yak 54 ARF. You'll need a fueling valve, a 2-3/4" (70mm) aluminium
spinner, and propeller and a glow plug to suit your engine. You'll also need typical modeling supplies, such as foam rubber to protect
your receiver and battery. White covering material will also be required to seal the aileron and elevator hinge gaps.
hErE's a lisT of WhaT WE rECoMMENd To fiNish ThE yaK 54 arf
QTY.  Airtronics RDS8000 FHSS 2.4GHz Radio Control System
QTY.  Magnum XL .20RFS Four-Stroke Engine
QTY. 4 Airtronics 9462z High-Torque Metal Gear Ball Bearing Servos
QTY.  Airtronics 94358z High-Torque Metal Gear Ball Bearing Servo
QTY.  Airtronics 9402z Standard Servo
QTY. 4 Airtronics 2" (305mm) Servo Extensions*
QTY.  Magnum 2-3/4" (70mm) Aluminium Spinner
*
The Yak 54 ARF allows the option of mounting the two elevator servos in the back of the fuselage (if using a heavier engine), or under the cockpit deck
(if using a lighter engine). If you mount the elevator servos under the cockpit deck, servo extensions should not be necessary.

our rECoMMENdaTioNs

WhaT gloW ENgiNE should i usE?
WhaT radio CoNTrol sysTEM aNd sErvos should i usE?
To get the most out of the aircraft, we suggest using a higher-end digital
programmable radio control system, such as the Airtronics RDS8000 FHSS
2.4GHz radio control system or the Futaba 7C FASST 2.4GHz radio control
system. Either of these two radio control systems will provide the advanced
features that most fliers want for this type of aircraft.
Because of the size of the aircraft and the large control surfaces, you must use
high-torque ball bearing servos. For crisp, positive control, we suggest using
high-quality, dual ball bearing servos with a minimum of 00oz/in of torque on
the ailerons and the elevator halves. We suggest using a high-quality, dual ball
bearing servo with a minimum of 50oz/in of torque on the rudder. For throttle
control, a standard ball bearing servo can be used. We suggest using Airtronics
9462z servos for the ailerons and the elevator halves, an Airtronics 94358z
WhaT oThEr iTEMs do i NEEd?
QTY.  APC 6 x 6 Composite Propeller
QTY.  Thunderbolt 4-Cycle Glow Plug
QTY.  Magnum Fueling Valve
QTY.  Global Silicone Fuel Tubing
QTY.  Du-Bro /4" Foam Rubber
QTY.  Monokote Opaque White Covering Material
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