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Nov 02, 2017, 04:59 PM
Nose down, you're gonna stall
rowdyjoe's Avatar

Yak 130 90mm Refurbish

I picked up a good deal on an older version of the 90mm Freewing (i.e. Ready2Fly) Yak 130 and have begun the job of refurbishing it. It's not in bad condition but, it was missing parts that were easily replaced via Motion RC spare parts. It appears to have suffered a bad landing at some point in it's career and was put away with incomplete repairs. The front landing gear strut retaining pin was bent so, I un-bent it, both horizontal stabs were missing along with the right main gear and retract unit. Additionally, most of the gear doors were MIA. There are a couple of blemishes that need some TLC but, the needed parts are on order or on-hand and it's coming together quicker than I expected. However, with the holiday season fast approaching, it probably won't be ready to fly until early next year. It's a good winter project.
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Jan 03, 2018, 04:53 PM
Nose down, you're gonna stall
rowdyjoe's Avatar
More on the Yak 130 ...
First flight was short and not so good. As it turned out, the "zero" position of the elevator was incorrect and the plane acted like it was severely tail heavy. The elevator control system is nothing like I've seen before. It is completely housed inside the aft section of the fuselage and controlled by two servos. It is supposed to be set to the correct position during assembly but, was not. After a near fatal crash on the first flight, I double checked the CG and determined the correct position via the "new version" of the instructions and asking questions on the extensive forum on RC Groups. 60 clicks of down sub-trim came very close to the correct "initial" position.

About 2 weeks later, after relatively minor repairs, flights 2 thru 5 were successful. Flight #2 was a bit shaky as I trimmed it out but, all worked out OK. Duration with a CNHL G+ 6s 5000mah 70c battery was about 2 min. The landing was a bit hot but, uneventful.

Flight #3 was a bit harrowing as the front nose wheel axle backed out and jammed the nose gear doors leaving the front wheel partially protruding. I landed on the mains and held the nose off as long as I could. When the nose dropped, the front gear doors departed but, were easily recovered. While attempting field repair, I found the errant nose wheel axle retaining clip on the bench (go figure ). Due to missing linkage for the small front gear doors, I flew the next flight without them.

Flight #4 was great. A little trim for roll and pitch and she was flying straight and true. I had read that this was an anemic flyer on 6s but, found that not to be true. The prototype of this plane is intended to be Russia's answer to the A10 so, it's not supersonic. They also have a trainer version. IMO ....flight is scale-like and solid and it handles very well at low speeds. Duration for this flight was about 2.5 min and the landing was easy. It will float forever if not slowed properly on final.

Flight #5 was the best. No issues and very solid. Duration was 3 min. 15 sec.. The battery was warm, as it was after all flights, cell voltage was 3.7 range on all cells and IR was 2 across all cells. The landing was a "grease job" in no-wind conditions.

I LIKE the way it flies and can hardly wait for decent weather to fly it again.

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