Hello, all RC lovers.

I haven't been in the RC hobby world for a long time and the last year was my first flight season. Having watched beautiful movies and got enthusiastic about the idea, I launched a completely unsuitable for first flights project Extra,
EXTRA - my first experience+3
Jan 27, 2016, 10:37:26 PM | Aleksey Gorohov Oryol
Article http://www.rcfair.com/blogs/view_entry/13194/
and that's why I bought a couple of gliders to gain elementary skills.

The gliders did their part provided a steady circle flight. They look very beautiful in the sky and turned out to be rather enduring survived crashes and unskillful landings. All these engouraged a further art and a new project. I decided to make a small 1 meter wingspan aircraft with landing gear. I chose Yak-54 due to drawing availability on the Internet. It took only a month the Blue Yak to be ready for a takeoff.


Unfortunalety I don't have photos of the blue Yak building, but remebering that meeting this the ground as well as with failures and disappointments are unavoidable I decided to make one more. Piloting my gliders helped me to understand how difficult it is to transport in a car a model with non-removable stabilizer, let alone a public transport. The solution is easy, the model should be made as folding as possible.
Material for building: styrofoam cutted into 5, 4 and 3 mm plates, 3 mm plywood and carbon tubes.
I start the assembly with the inner frame, model knife and radio aerial tubes are the main tools.





I made a rest with a shelf for small stuff to make the work easier.

Paste formers, a fuselage spine fairing and a plywood plate for the landing gear fixing on the inner frame.


Paste a removable cover on the top of the inner frame.

Then glue the stabilizer and the fin.

For the fin to the fuselage fixing two 2 mm in diameter carbon tubes are pasted in the fin frame.
Glue the fin covering along the front edge.
Paste the covering to the frame.

Try the fin and the stabilizer on the fuselage.

Now it's wings turn. A wing frame is of styrofoam, 6 mm in diameter carbon tube takes a role of a spar and also connects outer wing panels.



Here is the result.
This lock was made for a wing fixation.
The lock is pasted on a reinforced rib.
Tighten the screw and the wing will be fixed on the tube. Loosen the screw and the wing can be easily removed from the tube.
It's time to get back to rudder surfaces. The construction of elevator, rudder and aileron are the same.
The main part is 3 mm carbon tube with plywood or textolite blackets acting as hinges.







Pasted reinforcing plates of 1 mm plywood to the edges and tips to them.

Cut and sand the unnecessary.

Airlerons.


Cover the wing with 4 mm styrofoam and mount a plate for aileron servo.



Paste a fork for connection with a servo on the aileron tube.


Plates for the servos and a wing cradle should be pasted before fuselage covering glueing.
This part was made to make building of the wing cradle easier, which was made in accordance with its shape.



Now the covering can be pasted.


Not to be torn away during the flight the front part of the top cover goes in the fuselage covering and the back part is fixed by a magnet.


An accident which had an influence on the further building happend during the building. Flying low the Blue Yak caught on the grass with its wing and crashed in the ground with its spinner. The result is in the photo.

Styrofoam turned out to be easy torn. The solution is a sticky tape, but I can't stand it although I use it during the assembly. I decided to reinforce the covering by fabric with PVA adhesive. The result is a beatiful surface which can be even painted with nitro paints. The cost is extra 50 grams to the weight.

Make a sight hole to let the aileron fork hit the servo arm.

Cut one side of the servo hatch before the fuselage covering with the fabric.

Cut the others sides after the covering with the fabric and have a hatch for the servo done.


It's time to finish the tail. Paste in threaded studs.
Ice-cream stick to the fuselage.


Two plates for ending.


The tail and the stabilizer can be removed if needed just by loosening of two screw nuts. A tail skid or a tail wheel can be screwed on the studs which hold the tail.


Some weight data: the fin without fabric is 13g, the stabilizer without fabric is 20g.
Airframe total weight is 258g without fabric and 310g with fabric, the paint adds 55g more. Total weight is 265g without a cockpit conopy and an equipment.
The cowl is turned on a plywood disc with a held in a drill screw in the centre of styrofoam. Styrofoam was fixed to the disc by double-sided sticky tape. Shutters are made of candy box cardboard.


The motor mount is cut from fruit box plywood by an electric fretsaw.

The motor mount weight with motor Turnigy D2836/8 1100KV Brushless Outrunner Motor
Product http://www.rcfair.com/en/product/182597/

with 2200 mA·h battery and ESC is 330g.

The cockpit canopy building was described in a separate article.
Building a canopy+0
Feb 9, 2016, 1:49:02 PM | Maksim Rar Sankt-Peterburg
Article http://www.rcfair.com/blogs/view_entry/13256/
Paited by nitro paint by a air-brush without priming, directly on the fabric.



That's all I wanted to tell you. At the momnet there is a delay because of the material for the landing gear. I cannot find suitable duralumin and think of making one of glass fabric.
Model characteristics:
Wingspan - 1070 mm
Length - 900 mm
Weight without landing gear and propeller - 740g.
The model requires 5 channel control system as aileron setting to zero is made by sub trimming of each wing separately.
The forced idle time wan't in vain. A new fabric covered and painted fuselage was made for the Blue Yak. Also shutters were added to the cowl. The wings, the cover and the tail are old. Here is the advantage of a folding construction.


Compas 3D V13 file with drawing for those who desire to repeat. (Yak54ForRCFair.frw)
A CorelDRAW file added, during the conversion prints and paint schemes were lost.
(Yak54ForRCFair.cdr)

And image files: (Yak-54Wing.jpg) (Як-54Fuselage.jpg) (Yak-54Stabilizer.jpg)
(Yak-54MotorMount.jpg) (Yak-54Fin.jpg) (Yak-54colorschemes.jpg) The images are in real size and may take a bit to load.

Lucky flights and landing to everybody.

P.S. Here is one more. I made it for a a friend, may be we will fly together.
This is the translated version. You can read the original Russian article here.