Dear friends, hello again!
I'm continuing my big and light-weight foam RC aircraft column, so here are the stages of building the legendary Yak-52. I'm not claiming perfection, this one is going to be a semi-replica.

Let's go.
Wingspan: 2m
Material: laminate flooring underlay
Propeller: TGS Sport 17x10E Precision
Motor: HobbyKing Donkey ST4010-820kv
Speed controller: Turnigy Plush 60А с BEC 3A Brushless
Servo: HXT900 (9g)
To start with, please, let me remind you how it happened before, chances are someone would like to read or reread my old posts.

Yak-3: Two-Meter Foam Sheet+5
Apr 12, 2016, 1:15:50 PM | Aleksey Zelenin Novoaltaysk
Article http://www.rcfair.com/blogs/view_entry/13643/

АN-14 Little Bee: lift-off and crash+9
Dec 24, 2015, 1:18:59 PM | Aleksey Zelenin Novoaltaysk
Article http://www.rcfair.com/blogs/view_entry/13028/


And now back to the Yak-52
I started with landing gear, because there were lots of things I was not sure about at the beginning. I was concerned about resemblance to the original and did not want it to be too heavy, yet I wanted it to be sufficiently tough. I experimented a little and here is my choice:











I cut the wheels out of laminate underlay just because, once again, weight was paramount and crucial to me. Anyway, replacing them would not be a problem.




Next came the fuselage.




Then the tailfin and the rudder.










Many guys ask me about wing joints, which i make from fishing rods, so, please, view the picture below. I use two identical butt-end pieces.







Next I built a bookstand-style skeleton for the wings. I liked this technique because the ribs landed right where they should be.







I made a wing cut-in template so that I could cut out the wing slot with a string.





I wanted a maximally lightweight aircraft, so I cut the cowl out of laminate underlay too. I made the dummy of XPS.








I decided to build a semi-replica prop and I wanted it to compete with a Chinese one. Although I was not a one-hundred-percent success, it worked not bad. Then I borrowed a prop from a hobby mate, grooved it for better thrust at a low speed, and decorated/painted it.



I also tested it on my little motorized rig, and it did quite well, thrust was as good as that of a fine piece made in China. Except there was a bit more current, but only by a narrow margin. The sound compensated for the little flaw.

Yak-52 planes have huge canopies. Mine is 650mm long, so I made the dummy out of XPS and lined it with resin with fiberglass.





Inside the canopy


I decided to frame the canopy with a piece of a ceiling tile, so I painted and glued it to the canopy.



This is what it looked like when I finished painting it.

With details it looks pretty much like a semi-replica.


Now, this would be it. If you are interested in details or want a little talk, please, welcome:
http://forum.rcdesign.ru/f81/thread456685.html#post6358245

Oh, I all but forgot about weight. I mean, I'm not quite satisfied with it, because it turned out to be a little heavy. It was 2,180g at some point, but later I had to add a tiny bit. Well, I'm kidding you a bit, I mean chances are the drying glue will take a bit of weight with it. Well, never mind.

Now, this is the system that I used during the first test-flight:
TGS Precision Sport Propeller 17x10
Product http://www.rcfair.com/en/product/1083083/

HobbyKing Donkey ST4010-820kv Brushless Motor
Product http://www.rcfair.com/en/product/103719/

HXT900 Micro Servo 1.6kg / 0.12sec / 9g
Product http://www.rcfair.com/en/product/662/


I used a two-cell 5800mA battery. My Ish did well on this system, but it was much more lightweight, so I will modify the system on the Yak, definitely. But not now. Then I'll post a vid.
And now a little rough stuff on my first two test-flights:



I hope the new owner of the Yak-52 will share his new video of it flying on another propulsion system and therefore having a better thrust. Thank you so much for watching the whole video, I hope we'll meet again more than once on the same old RC hobby backdrop.

This is the translated version. You can read the original Russian article here.