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Aerobeez 73″ Yak 54 Step-By-Step Build Guide

Posted by aerobeez On July - 9 - 2014

Hello Aerobeez Pilots and welcome to our 73″ 25% Yak 54 build guide. In this article we will walk you through step by step as you build your new 73″ Yak 54 ARF Kit. If you have experience with putting any ARF together, this build should take you about 10-12 hours to finish.

Here is what the 73″ Yak 54 will look like once complete!

Yak 54 Red

Here are the specs of the plane:

Wing Span: 73″
Length: 67″
Wing Area: 1045 sq in
Fly Weight: 10.5 – 11.5lbs

So without further ado, let us begin!

Note: The provided stock firewall template is outlined for a DLE30cc engine.  If a DLE35 RA is used, the top outline will be correct, however the bottom will need to be relocated. Use these DLE 35RA dimensions for reference.

Yak 54 Red

Step 1.1:  Lay out the fuselage and prepare to install the main landing gear.

Yak 54 Red

Step 1.2:  Locate your landing gear bags, wheels and hardware.

Yak 54 CF Landing Gear

Step 1.3:  Use a piece of rolled tape to assist in installing the lock nuts to the landing gear on the inside of the fuselage.  Using tape will assist in this nut install as it will allow you to use one finger to locate the bolt.

Yak 54 Build Guide

Step 1.4:  Tighten the 4 landing gear bolts to the carbon landing gear.  Note: The bolts may or may not be tightened on or above the gear cover.  This will be personal preference.  The photo shown is the bolts located through the cover.

Yak 54 Build Guide

Step 1.5:  Install the wheel axles to both sides.

Yak 54 Build Guide

Step 1.6:  Install the wheel spats using the blind nuts and hex screws as shown.  Note:  The blind nuts are on the inside of the wheel spats.

Yak 54 Build Guide

Step 1.7:  Install the wheels as shown with 2 wheel collars per side.  Note:  Use blue Loctite on the set screws in the wheel collar.  This will insure a solid set screw.

Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Step 2.1:  Locate the rudder hinges and put a drop of house hold oil on the pivoting area of the hinge.  This will help in keeping the hinge free while gluing to the rudder and vertical stabilizer.

Yak 54 Build Guide

Step 2.2:  Epoxy is the preferred adhesive for the rudder hinge install.  Glue the hinges to the rudder first.  When the glue has cured, glue the rudder to the vertical stabilizer.  Note:  Do not try to glue both sides of the hinges at one setting, this will cause panic as it is very difficult to gauge the 3 hinge gapping.

Yak 54 Build Guide

Step 2.3:  Glue the hinges to the rudder first.  When the glue has cured, glue the rudder to the vertical stabilizer.  Note:  Do not try to glue both sides of the hinges at one setting, this will cause panic as it is very difficult to gauge the 3 hinge gapping.

Yak 54 Build Guide

Note: The rudder gap and hinges once glued should look like the example image shown here.

Yak 54 Build Guide

Step 2.4:  Once the rudder has been glued to the vertical stabilizer and full cured, locate your tail wheel assembly as seen here.

Yak 54 Build Guide

Step 2.5:  Install the tail wheel assembly.  Note:  For the 3 self tapping screws holding down the main carbon tail wheel bracket, it is best to drill a pilot hole first using a 1/16 drill bit.  Mark the hole areas with a pen or sharpie.  Drill the 3 pilot holes prior to installing the tail wheel bracket.  This will give a secure hold and prevent the wood from splitting.

Yak 54 Build Guide

Your Yak54 should now be standing on main and tail gears.

Yak 54 Build Guide

Step 3.1:  Next we are going to install the rudder servo and pull/pull cables for the rudder authority.  Have your servo with the grommets and the brass insert installed on the servo.  Test fit the rudder servo and using a 1/16 drill bit, pre drill the 4 holes per servo.  These are pilot holes and should be pre-drilled for all servo installs.  Again, the pilot holes are to insure a solid screw to wood connection with out the possibility of splitting the wood on a dry self tapping method.  Note:  Once the pilot holes for your servos have been drilled, it is best to put one drop of Thin CA (super glue) to each pilot hole.  This will help greatly in the strength of the wood and hold of the screw.

Aerobeez Yak 54 Build Guide

Step 3.2:  If you placed a drop of CA to your rudder pilot holes, while that is setting and drying, this is a great time to further strengthen your motor box.  These steps are very simple and will greatly increase the motor box strength!  Use thin CA and this method is called “wicking”.  Basically you are soaking the triangular wood stocks inside the motor box as shown.  Repeat this on all 4 axis of the motor box.  The CA glue will soak into the wood and assist in a very superior bond for the motor box.  (this step is for the pilots personal preference.  It is not needed.)

Aerobeez Yak 54 Build Guide

Step 3.3:  Repeat on all four motor box axis and side triangular blocks as instructed above.

Aerobeez Yak 54 Build Guide

Step 3.4:  Now install your rudder servo.

Aerobeez Yak 54 Build Guide

Step 3.5:  Locate the 2 slots per side that has been pre-cut for the rudder control surface.  The covering will be over the slot areas and the covering will need to be removed.  Use a bright flash light and from the opposite side, you will be able to see the slot areas.  Or you can do what Pete does.  Press feel on the control surface and you can feel the slots.  Use a sharp hobby knife and remove the covering from the 2 slots per side as shown here.  On your included fiberglass control arms, use sandpaper or a dremel tool with 400 Grit to “score” the fiberglass horn as seen here.  If you don’t have any 400 Grit sandpaper, any sanding will do fine with any sandpaper.  This step is a key hint from Pete.  Whether you CA or epoxy your surface horns, this will insure a great glue to wood ratio adhesion.  The rudder pull/pull horns will now need to be cut.  Test fit the horns and cut away a portion until you have your desired fit. The stock provided arms will be perfect in size for the other surfaces and this will not be a necessary step, but for the rudder pull/pull the ends will be too long.  Cut away the arm until the fitment is as shown in Step 3.6.

Aerobeez Yak 54 Build Guide

Step 3.6:  Using epoxy (preferred adhesive) glue the control surface horns as shown.

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Step 3.7:  Using a small piece of Blue Tape or any tape you have, secure the rudder from the leading edge as shown.  This will assist in the rudder pull/pull cable install.

Aerobeez Yak 54 Build Guide

Step 4.1:  Locate your Rudder pull/pull components as shown.

Aerobeez Yak 54 Build Guide

Step 4.2:  Be very careful and unwind the rudder pull/pull cable.  DO NOT PULL HARD if there is a snag.  We do not want to “kink” the rudder cable.  Take your time and unwind the cable slowly.

Aerobeez Yak 54 Build Guide

Step 4.3:  Run the cable to one side of the ball end fitting as shown here.  Using the included crimps, loop the cable as shown and crimp down.  Note:  You can use pliers to crimp.  A crimping tool is not needed.

Aerobeez Yak 54 Build Guide

Step 4.4:  After crimping a Pete tip is to use a small amount of thin CA on the crimp area.  This will assist greatly in the connection.

Aerobeez Yak 54 Build Guide

 

Aerobeez Yak 54 Build Guide

Step 5.1:  Now we move to the motor install.  Drill a pilot hole for your motor of choice after you have marked the stand off mount areas.

Aerobeez Yak 54 Build Guide

Step 5.2:  In our install, we are using a DLE30 and the firewall template is Perfect!  Drill your pilot holes first.  Pete’s tip is using a pilot hole, will insure a centered drilled hole when using a larger drill bit for the motor bolts.

Aerobeez Yak 54 Build Guide

Step 5.3:  Motor firewall drilled.  Now soft mount your motor, mark and drill your fuel line and throttle servo holes.  Now, mount and secure your engine.

Aerobeez Yak 54 Build Guide

Step 6.1:  Mount your switch and fuel dot of your choice.  The Miracle single switch with fuel dot is shown and selected here.

Aerobeez Yak 54 Build Guide

 

Aerobeez Yak 54 Build Guide

Step 7.1:  Mount your throttle servo with the included throttle servo bay.  Note:  The mounting position is per pilots personal preference.  The throttle servo bay is not pre-determined due to the different engines and carburetor locations on the market.

Aerobeez Yak 54 Build Guide

Step 7.2  The best area for CG is to mount the throttle servo as close as you can to the motor without stress on the throttle servo push rod.  Pete has his mounted in the motor box and using small drilled holes in the motor box side to access the servo screws.

Aerobeez Yak 54 Build Guide

Step 8.1:  Install your control surface horns starting with your Elevators.  Again, it is best to sand the arms where the glue will be applied as shown here.  Epoxy is the glue of choice.

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Step 8.2:  Elevator control surface glued as shown.

Aerobeez Yak 54 Build Guide

Step 8.3:  Locate and cut out the servo bay for the elevator servos.

Pete’s tip: Cut the covering holes with 1/8″ covering remaining and using a covering iron, press down the covering around the servo bays.  This will assist greatly to prevent the covering from pealing in flight.

Aerobeez Yak 54 Build Guide

Step 8.4:  Drill your servo pilot holes and install your elevator servo.

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Step 8.5:  Install your control arm ball ends.

Aerobeez Yak 54 Build Guide

Step 8.6:  Install the horizontal stabilizers and your elevator push rods.  Adjust according to your servo/arm preference.  Geometry is very important.  Try to achieve the best level line push rod from your servo arm to the control surface.

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Step 8.7:  The elevator servo wires are best run to the top interior round wire area as seen here.

Aerobeez Yak 54 Build Guide

Step 9.1:  Repeat the process from the elevator horn and servo install for the Ailerons.

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Pete’s tip:  The push rods provided are positive and negative thread on one side to the other.  Meaning, don’t worry in regards to getting the perfect level on your control surface during the initial install.  Once your push rod ball ends have been installed, and mounted on the servo to the control surface, you can now adjust the length by turning the arm from the center as shown here. This makes the surface adjust very easy and precise.  Please adjust the surface when your servo is powered ON.

Aerobeez Yak 54 Build Guide

Step 10.1:  Install your fuel tank of choice.  The included fuel tank provided is a great tank!  We opted to use a 4Titude 16oz fuel tank as pictured here available at Aerobeez.

Aerobeez Yak 54 Build Guide

 

Pete’s tip:  Use zip ties on the connecting areas of the fuel line.  The added zip tie pressure will keep the fuel line from slipping.

 

 

Aerobeez Yak 54 Build Guide

Step 11.1:  Soft mount your Yak cowling and using a bright flash light from the inside of the cowl, you will be able to see the out line of your exhaust and motor cylinder head.  Mark the area and cut the cowl using a multi rotary tool such as a Dremel.

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Step 11.2:  Mount your cowling with the supplied screws x4.

Pete’s tip: Use a long 2.5mm hex driver and blue thread lock on the cowl bolts.

Aerobeez Yak 54 Build Guide

Step 12.1:  Drill your propeller of choice.  We used a 19×8 prop with our DLE30 and our Miracle propeller drill jig available at Aerobeez.com.

Aerobeez Yak 54 Build Guide

Step 12.2:  Mount your propeller and insert your main wing carbon fiber tube for test fit.

Aerobeez Yak 54 Build Guide

Step 12.3:  Install your main wings and secure with the included wing bolts.

Aerobeez Yak 54 Build Guide

Step 12.4:  Set your control surface throws to your flying preference.  Range test your radio system and if all is ready, and test CG. For CG on this ARF measure the CG from the leading edge of wing root rib.
Adjust the battery pack location. For CG proper position should be at 27% MAC. This recommendation balance point is for your first flights. The CG can be moved around later to fit your personal taste. If you are not comfortable with the calculus involved you can use this online CG Calculator. Just plug in the simple measurements and the app does the calculus.  Note: Use Diagram below as a reference for manual calculation. 

cg-diagram

 

And now IT’S TIME TO FLY!

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Aerobeez Yak 54 Build Guide

Aerobeez would like to thank you for your purchase!  Control surface deflections are a personal preference in your flying style.  For unlimited 3D, please use the surface throw in MAXIMUM deflection before surface bind.  Your Aerobeez team is available for any technical questions.  Please feel free to email us at any time.  Aerobeez appreciates your patronage!  Now go fly, enjoy your air time!

 

Your Hobby, Our Passion!

Aerobeez

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