Extreme Flight RC YAK-54 Manual de usuario

68 INCH

YAK-54

Instruction Manual

Thank you for your purchase of the Extreme Flight RC 68 inch Yak-54. Please

take a few moments to read this instruction manual before beginning assembly.

We have outlined a fast, clear and easy method to assemble this aircraft and

familiarizing yourself with this process will aid in a quick, easy build.

Please read the following paragraph before beginning assembly of your aircraft!

THIS IS NOT A TOY! Serious injury, destruction of property, or even death may

result from the misuse of this product. Extreme Flight RC is providing you, the

buyer with a very high quality model aircraft component kit, from which you, the

buyer, will assemble a flying model. However it is beyond our control to monitor

the finished aircraft you produce. Extreme Flight RC will in no way accept or

assume responsibility or liability for damages resulting from the use of this user

assembled product. This aircraft should be flown in accordance to the AMA

safety code. It is highly recommended that you join the Academy of Model

Aeronautics in order to be properly insured, and to operate your model at AMA

sanctioned flying fields only. If you are not willing to accept ALL liability for the

use of this product, please return it to the place of purchase immediately.

Extreme Flight RC, Ltd. guarantees this kit to be free of defects in materials and

workmanship for a period of 90 days from the date of purchase. All warranty

claims must be accompanied by the original dated receipt. This warranty is

extended to the original purchaser of the aircraft kit only.

Extreme Flight RC in no way warranties its aircraft against flutter. We have put

these aircraft through the most grueling flight tests imaginable and have not

experienced any control surface flutter. Proper servo selection and linkage set-

up is absolutely essential. Inadequate servos or improper linkage set up may

result in flutter and possibly the complete destruction of your aircraft. If you are

not experienced in this type of linkage set-up or have questions regarding servo

choices, please consult an experienced pilot or contact us. It is your

responsibility to ensure the airworthiness of your model.

Additional items needed to complete assembly.

.91-1.40 2 stroke or .91-1.50 4 stroke engine

3” spinner (We used a Tru-turn 2 7/8” Ultimate on our prototype)

Propeller

4 channel radio with five 90+ oz. in. torque servos for control surfaces and one

standard torque servo for throttle. We used the Hitec 5645 digital servos in our

prototype.

Servo arms (we highly recommend the Du-bro Super Strength servo arms for this

aircraft).

Fuel tubing

Foam padding for receiver

Nylon cable ties or Velcro straps

Servo extensions (see text for proper lengths)

A few words about the Extreme Flight RC 68” Yak-54

The current production version of the 68” Yak-54 represents a milestone in ARF

model aircraft production techniques and performance ability. This version is the

result of a lot of time and effort testing various configurations and materials to

achieve the lightest, yet strongest airframe possible. Ultra-modern interlocking

laser cut construction techniques combined with carbon fiber and composite

components help to achieve a lightweight, yet robust airframe. Each component

of the Du-bro hardware package was selected because of the high quality

associated with these products. These components have been proven over a

year of very aggressive flight testing. We highly recommend that you use the

included hardware.

We are very proud of the high quality Oracover finish on this aircraft, as well as

the beautiful, perfectly matched paint job on the cowl. The extremely lightweight

wheel pants are white gel-coated to eliminate the need for paint, thus saving

weight. In an airplane this size, every gram counts. We hope you will consider

this during your assembly of this aircraft. Resist the urge to “beef-up” the

structure and use caution when applying glue, using only the proper amount

needed for the task.

Flight performance of the 68” Yak is simply stunning! It tracks through precision

maneuvers much like a fine tuned pattern ship, easily performing any of the F3A

or Unlimited class IMAC schedules. The 3D performance of the Yak is unheard

of in a plane this size. The 68” Yak-54 is truly unlimited in its performance

capabilities.

By the time the Yak arrives in your shop, it will have endured several climate

changes. As a result you may find some wrinkles in the covering. This is not a

manufacturing defect. Please take a few moments with your iron or heat gun and

remove any wrinkles. Iron over all the edges to ensure they are sealed.

A high quality vinyl graphics package has been included with this aircraft. For

best results it is highly recommended that you spray the surface of the aircraft

where the graphic is to be applied with Windex or a soap/water solution to allow

for proper positioning of the graphics. When satisfied with their position, use a

credit card or rubber squeegee to remove excess fluid from under the graphic

and allow to dry overnight.

It is highly recommended that you keep your aircraft under a shelter, away from

direct sunlight between flights, or use some form of cover to prevent damage to

the canopy/hatch. Intense heat from the sun can distort the canopy/hatch, and

you want to take caution to prevent this from happening.

ATTENTION!

Due to a communication error, there are some extra hardware components

included with this aircraft. In addition to the Du-bro hardware package

located next to the cowl, you will find a second hardware package in the

cardboard divider containing the composite landing gear. You may choose

to discard this metric hardware, but there are five components in this

hardware package that are essential to the assembly of this aircraft. Please

do not discard the following items:

1. Four carbon fiber anti-rotation pins.

2. Nylon engine mount.

3. Tailwheel assembly.

4. Throttle linkage.

5. CA hinges.

Also please note that the 4-40 pushrods have been taped to the

cardboard divider separating the cowl from the fuselage. Do not

discard.

WING ASSEMBLY

1. We will begin by hinging the aileron to the wing. There are 7 CA hinges that

will be installed per wing/aileron. Use a ruler and measure from the root (closest

to fuselage) of the aileron to the tip and locate the hinge slots, then slit the

covering to access the slot (already cut) for the hinge. The following are the

hinge slot locations from the aileron root.

NOTE: All hinge slots are in the center of the bevel on all surfaces.

1. 1 ¾ 2. 7 ½” 3. 11 ½” 4. 13 ½” 5. 17 ½” 6. 22 ½” 7. 28 ¼”

Now transfer the slot locations to the wing.

Install the hinges halfway into the wing, then mate the aileron. Be sure the hinges

stay centered. Refer to figure 1.

TIP: To aid in keeping the hinges centered I insert a t-pin or draw a line in the

middle of the hinge.

Figure 1

2. We will now glue the CA hinges using thin CA. Be sure that the aileron stays

mated to the wing, do not allow more than 1/16” gap while gluing. I like to bend

the surface about 40° each direction while gluing. Apply glue to both sides of the

hinge, this method will also be the way we do the rudder and elevator hinging

later in the assembly process. Refer to figure 2 for my method, also you will

notice I have an extended tip on my CA glue bottle, this allows me to get the glue

in the exact area.

Figure 2

3. Locate the servo bay (bottom of wing near center) under the covering by

feel, once located cut the covering to expose the opening. You will need a 6” or

12” wire extension hooked to your servo lead so it will be able to go inside the

fuselage once the wings are installed to reach the receiver. Feed your servo wire

thru the wing to the root and let it protrude. See figure 3.

Figure 3

4. Secure your servo in the wing’s mounts with the output shaft closest to the

hinge line. Measure on the bottom side, at the root of the aileron 11 ½”, you will

feel a small hole under the covering where the 6-32 control horn bolt will be

located, remove the covering from this hole. Locate the control horn package

and use one of the 6-32 bolts and black mounting plate (with circle hole on the

top for the bolt head to set down into it). Insert the bolt thru the mounting plate

and screw the bolt down into the topside hole, you may need to drill the hole to

9/64”. Now secure the other mounting plate with hex nut onto the bottom side

and tighten. Take the 4-40 all thread rod and cut a piece 1 ½” long and install the

4-40 jamb nut and clevis to one end allowing about 2 – 5 threads showing thru

the clevis. Hold the control surface centered, also make sure the servo arm is

parallel to the hinge line and install the other jamb nut and clevis to the servo arm.

Use a thread locking compound to secure jamb nuts. Refer to figure 4.

Figure 4

5. Locate the package with the carbon fiber alignment pins, use two of them

per wing. The alignment pins fit into the two smallest holes in the wing root. Trial

fit before gluing. Using 30 minute epoxy lather all but ¼” of the pin and apply

some epoxy inside the hole. Insert the pin into the hole and there is another hole

in the number two rib that the pin will go into also. Leave about ¼” of the pin

without epoxy protruded from the wing, allow to dry. Take the included ¼” X 20

plastic wing bolts and cut them to ¾” long from the bottom of the washer head.

Refer to figure 5, it will show how the wing root will look when completed. From

left to right you will see the first alignment pin, then the carbon fiber wing tube

location, followed by the wing bolt, then the aileron wire and finally the rear

alignment pin. Repeat these 5 steps on the other wing panel. This will complete

the wing assembly. Figure 5 shows the wing completed at the root.

Alignment

pins

Servo wire

Wing bolt

Figure 5

FUSELAGE ASSMEBLY

6. Locate the gear, 4 of the 6-32 X ¾” bolts, washers and nylon insert hex nuts.

Hold the gear, with the slant forward, to the fuselage bottom in the gear slot and

center it. Now mark the location of the bolt holes onto the gear from inside the

fuselage, drill the holes slightly larger than the bolt. It is highly recommended

that you place a wood block behind the gear before drilling to prevent damage to

the rear side of the gear when the drill bit exits. Install a washer on each bolt and

slide the bolt from the gear’s bottom up into the aluminum gear mounts. Secure a

nylon insert nut onto each of the 4 bolts and tighten. See figure 6 and 7.

Figure 6 Figure 7

7. Trim the covering around the wing slot, elevator servos and horizontal

stabilizer locations. EF suggests that you leave 1/8” of covering at the wing slot

(see figure 8) and iron that into the slot. At the horizontal, leave 1/16” of covering

and iron into the slot. The elevator servo slots may be cut and ironed as desired.

1/8” covering

left that may

be ironed to

inside of

fuselage

Figure 8

8. Locate the horizontal stabilizer and both elevators. First lets find the hinge

slots using the same methods as the ailerons. The hinge slots will be found by

measuring from the tip of the horizontal inward to the root. See figure 12.

1. 1 ½” 2. 3 ¾” 3. 6 ¾” 4. 8 ¾”

DO NOT GLUE THE HINGES AT THIS TIME

Figure 9

9. We will now prepare to mount the horizontal into the fuselage. First locate

the exact center of the horizontal, next take the measurements of the front and

back widths of the stabilizer slot in the fuselage and transfer those to the

horizontal. Gently cut that covering making sure you do not cut into the sheeting

and leave about 1/16” extra covering when finished. See figure 10.

10. Read and understand this step completely before proceeding. Install the

wings onto the fuselage. You may dry fit the horizontal and find where it centers

and mark it with tape or similar material or proceed with the gluing process. We

will now glue the horizontal stabilizer into place, if you did dry fit the horizontal,

remove it at this time. Mix ample 30 minute epoxy and apply to the inside of the

fuselage slots and to the bare wood on the horizontal. There is no need to apply

epoxy to the exact center of the horizontal, only the areas that will make contact.

Have a cloth/paper towel soaked in rubbing alcohol ready, now slide the

horizontal into the slot and center it in the fuselage. Wipe the excess epoxy with

the cloth. Use a ruler to measure from a common point on each side of the

horizontal to a common point on the fuselage to be sure it is centered. Prop the

tail up so the fuselage is level and view the wing and horizontal from the front

and back to make sure they are aligned. If the horizontal is not aligned, take

some masking tape and pull one side up or down and tape it in place to hold it

while the glue dries. Finally, you may add some glue to the inside thru the

elevator cutout holes. Allow this to dry completely before proceeding. Refer to

figures 10, 11 and 12 to help with this important step. Hinge both elevators.

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