Great Planes Yak 54 3D ARF - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-23-2008, 09:16 AM   #1
Carl Layden
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Great Planes Yak 54 3D ARF

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Great Planes Yak 54 3D ARF

Manufacturers Specs:
Wingspan: 41 in
Wing Area: 356 in²
Weight: 24-27 oz
Wing Loading: 9.7-10.9 oz sq/ft
Fuselage Length: 38 in

Requires: 4-channel radio with 4 micro servos; RimFire™ 35-30-950 out-runner (GPMG4590) or Ammo™ 24-33-4040 in-runner (GPMG5165) brushless motor; 24 mm gear drive with 4.5:1 gear ratio (GPMG0505); 25 amp brushless ESC (GPMM1820); 3-cell 1250-2100mAh LiPo battery; and LiPo-compatible charger.

Set-up as flown:
Motor: Turnigy TR 35-30C 1100kv Brushless Outrunner
ESC: TURNIGY Plush 25amp Speed Controller
Batt: 3S1P 2250 Mah LiPo
Prop: Topflite 12x5 wood
Servos: Hitec HS-55
Rx: Spektrum AR6200
Tx: JR 8103 w/Spektrum Module

The GP Yak is a good quality ARF that assembles quickly. Following the instruction booklet it took me about 10 hours to assemble. The model is very lightly built it is susceptible to hanger rash so be careful during assembly.

Changes I recommend from the manual:

- Use Velcro or a balsa sticks to prevent battery from moving forward or aft. The battery should not be able to move once strapped in place.
- Tail feathers, several online forums say the tail feathers will break in flight. Note that these failures occurred when the plane was powered well above manufacturers recommendation. Knowing this I used some Kevlar thread to re-enforce the tail. Thread the Kevlar through the vertical & horizontal surfaces much like flying wires would be arranged. A drop of CA at each hole will secure the Kevlar.
Canopy – The manual suggests using clear tape (scotch) to hold down the canopy…like wearing socks in sandals. A little 2-way tape will keep the canopy on and the tape is hidden.

After completing a range check, and preflight of controls I hand-launched the Yak. A slight underhand toss was all it needed; it didn’t really need the toss.

A couple clicks of down thrust, one click right aileron was all that was needed to have it flying straight and level.

Low-rates are good for general sport flying and most aerobatic maneuvers. I suggest using the 3D rates only when flying 3D. Full deflection of 3D controls in normal flight will cause the aircraft to snap. The Yak can perform any aerobatic maneuver possible. It easily hovers with the motor combination used and will accelerate up out of the hover.

Wind (up to 20 kph) doesn’t seam to affect the planes performance. It penetrates well and doesn’t bounce around in a breeze.

Overall I would recommend the Yak to pilots with some aerobatic experience. It’s a balsa park flyer that performs like glow powered planes much bigger. If you are looking for a park flyer that has excellent performance and quality the Yak 54 3D ARF might be for you.

Equipment Purchased From:
Signal Hobbies
- Yak 54 3D ARF
- Hitec HS-55 Servos

Hobby City
- Turnigy TR 35-30C
- Turnigy Plush 25amp Speed Controller

Have fun,
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Carl Layden

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