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/

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/

To start with, please, let me remind you how it happened before, chances are someone would like to read or reread my old posts.And now back to the Yak-52I 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 canopyI 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: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: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.