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Monday, March 21, 2011

Yak vs. Yak

The Yak-54 more than meets my "classic" criteria to own, and the Art-Tech Yak 54 was such a great flier (after it became clear the flaws I noted were attributable to poor Spektrum DX8 radio quality) it convinced me to do a new Z8RC series called, "Yak vs. Yak."

I'll increment aircraft size as I go, and I reserve the right to sneak in a Yak-55 if/when it makes sense.  Next up will be the Great Planes 41" Yak-54 with it's admirable (estimated) wing  loading for a 356 sq in model.


But as the chart below shows, the ATY54 and Z8ATY54 are no slouches either, and that certainly shows in the air. I'm still deciding on the best power system for the GPY54; I've estimated a few trades below:

GP Yak-54 (ST .10)
GP Yak-54 (ST 400 on 2s)
AT Yak-54 (Stock)
Z8 AT Yak-54 (ST .10)
Airframe Weight
12.00
12.00


Servo Weight
2.10
2.10


ESC Weight
1.20
1.10


Motor Weight
2.20
1.80


Mount/Misc Weight
0.60
0.40


Prop Weight
0.80
0.80


Batt Weight
4.05
2.00


Wing Area
356.00
356.00
297.00
297.00
Installed Thrust
44.00
30.00
21.00
44.00
Fly Weight (oz)
22.95
20.20
19.00
20.00
T:W Ratio
1.92
1.49
1.11
2.20
Wing Loading (oz/sqft)
9.28
8.17
9.21
9.70

If the wind ever stops blowing 25 mph, I will also re-evalute the AT Y54's performance with a self-serviced DX8 radio. I thought the Yak's lack of precision was due to Art-Tech servo arm slip (corrected review), but as usual, AT provided exceptional flying qualities for the money.  The random lack of precision that I experienced was due to a FUBAR Spektrum DX8.
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