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Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Old 03-13-2008, 02:22 AM
  #826  
jaybird11
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

FEW PICS OF MY 25 % YAK 54 GP
DA 50,HITEC SERVOS,DUAL ON ELE,AND RUD,CARBON FIBER BALL LINKAGE, GRAPH TEC CARBON LANDING GEAR FRONT AND REAR , ZINGER 22X10 FOR BREAK IN WITH 4 1/2 INCH CLEARANCE. SPEKTRUM WITH 6 VOLT POWER BUS FOR SERVOS,PITTS SMOKE MUFFLER. PLANE COMES IN AT 13 1/3 POUNDS. READY FOR HER MAIDEN. THRO SERVO ON TOP OF ENGINE BOX 4 INCH ROD!
Old 03-13-2008, 02:25 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

PICS
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Old 03-13-2008, 10:18 AM
  #828  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

And I thought I was crazy when it comes to POWER, I have 18lb Double Vision DA50 combo, pulls out of hovers with authority. I knew someone who had a Vision 15.6 lbs with DA50, he complained it was hovering near idle, which is a rich setting. Have you flown it yet, have to know how you are going to manage the POWER!
Old 03-13-2008, 02:04 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Jaybird,

Beautiful job. One thought. I originally had my throttle servo in the engine box. I had to move it to the receiver tray because it was jumping all over the place when I started the engine (Fuju 43EI-2). You may be fine though with the Spektrum as I have it on 72 Mhz PCM. Once I moved it back away from the ignition, it became solid and no problems. You will love the airplane.

Brian
Old 04-16-2008, 11:53 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Delrin:

What do you think if I put a Zenoah G-38.... Underpowered, too heavy¡¡¡. I`m still running it with a menz 18x10.

arrestix
Old 04-20-2008, 08:49 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi All, was do yall think is the lightest of Great Planes performance 25% planes? i have a CRRC 45i and am wanting a home for it. It spinns a 20x8 7400 rpms.
Old 04-20-2008, 09:49 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Lightest plane or lightest wing loading?
Old 04-20-2008, 10:14 AM
  #833  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I've got a GP Cap 232 27% which is part of their Performance Series. It comes in at 14.6 lbs with a Da 50
Old 04-20-2008, 11:32 AM
  #834  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Lightest plane!!
Old 04-20-2008, 01:02 PM
  #835  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Arrestix:

I think it would be both underpowered and too heavy with the stock trim and a G-38. How many HP is the Zenoah? The Fuji is rated at 4 HP and has unlimited vertical and hovers at 1/2 throttle. I used the lightest parts and techniques available when building it. I spent another $200 to lighten it up though.

RCWI:

Mine came out at 13.0 lbs even, with a 4.2 lb Fuji 42EI-2, carbon spinner and prop in the nose.
Old 04-20-2008, 07:30 PM
  #836  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I have the YAK54 with a 46 cc gas engine and I think it is too heavy - but "heavy" relative to wing loading. I should say flies heavy, but it is a great IMAC plane with that setup. I am going to put a big glow in it, probably an OS 1.60, maybe a MOKI 1.8 - but the extra 1/2 lb from the MOKI I can do without. The gas engine will go in a new GP Ultmate Bipe - which has another 300 sq inches of wing area and will have less wing loading than the YAK with an OS 1.60. So it will be "heavier" but should fly lighter. What would be nice is an engine with the power of a 50cc and the weight of an OS 1.60.[8D]
Old 04-21-2008, 07:38 AM
  #837  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

PEOPLE IN MY CLUB FLIES THIS YAK WITH AN O.S 1.60 FX VERY, VERY WELL.
I THINK A ZENOAH G38 WITH PITTS MUFFLER AND MENZ 18X10 IS A GOOD MATCH FOR BASIC IMAC.
Old 04-21-2008, 08:28 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

IMAC barely, no 3D with 2.5 HP and a boat anchor on the nose. The price of the G-38 is the only upside.

The OS 1.60 is more than 2 lbs lighter than a Zenoah G-38 and has almost 1.5 more HP. That's why they fly very well with it up front.

IMO

Delrin
Old 04-21-2008, 11:50 AM
  #839  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

DELRIN:

I WANT TO DO A TEST WITH THIS ENGINE BECAUSE IS NEW IN THE BOX, IF IT DOESN`T WORK, PROBABLY BUY AN O.S 1.60 OR DL 50.
Old 04-21-2008, 03:22 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Is the yak good for imac?
Old 04-21-2008, 03:47 PM
  #841  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi

Here in my country there are lots of YAK's fling IMAC composite´s arf, great planes, extreme flight´s, richmodel´s, etc.
Old 04-28-2008, 03:48 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Ok guys, I got my Yak up in the air last weekend running a O.S. 160. I only had a wooden zinger 18 X 6 prop. It did take off great and flys nice but in a hover I am at 99% power. Is it the prop?

My CG is 6 3/4 with the battery next to the firewall. It is 13 pounds and 8 oz.

I will attend the Fun Fly Saturday in Columbia MO and I hope to post some Video

Crash99
Old 04-28-2008, 08:39 PM
  #843  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Crash99,

From what I have read, a good 3D prop for the 1.60 is an APC 18x6w.
Old 04-28-2008, 09:39 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Alas I got bitten by the heli bug and so now my Yak is for sale. Search the ads for my username.
Old 05-05-2008, 04:35 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

OK, I put on the APC 18X6w and it still hovered at 97% power. What am I doing wrong. Yes it will take off and shot up to the sky and fly great but I am starting to think the 160 will not give me safe 3D performance. It will hold in a hover but I would hate to need power to get out of trouble.

Crash99
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Old 06-03-2008, 12:16 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

gboulton

I DID discover a MAJOR flaw in mine today though...

It flatspins WAY too well.

We tried our first flatspin as a team today...downline...left aileron rollrollrollroll...blender, off the aileron and *whack*..instant flatspin. It's not THAT easy on the stupid SIM for chrissakes.

And it was GORGEOUS. I sat there, simply blown away (shakes, I know how you felt now)...watching....and watching...and admiring...wow, look at that...man, that's ust gorgeous...right around the center of the plane...nice slow rotations...wow, look at that...man, that's just..hey, what are those green leafy things? Err...shouldn't the pilot recover that thing? OH! HEY! RIGHT! THAT'S ME!

Thankfully, she recovered in less than half a rotation, and flew right out. But I really DID almot flatspin her right into the trees, too busy admiring. I mean, clearly it wasn't ME at the controls, I'm nowhere NEAR that good of a pilot.

Gotta say...I'm lovin this plane more every time I fly it.
This is a really old post but I killed myself laughing when I read it. Been there... done that.
Old 06-04-2008, 01:26 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Off the subject a little.

I have been flying for 24 years now and I have to say this is the best ARF I have ever flown. Moki 2.10 20x10 prop 14.56 lbs. Flies fantastic. Unlimited vertical at 3/4 throttle. Flies perfect hands off inverted and upright. Very precise like a pattern plane. Great airplane.
Old 06-07-2008, 02:52 PM
  #848  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I just bought one of these planes used. At the moment it has a Saito 220 in it, and from the specs i thought that was more than enough for 3d. But some of you ****s are running quite a bit large engines.

How do you think the Saito 220 will handle Hovering?

Old 06-11-2008, 11:22 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

for the people who used gas engines where did you guys put the choke and throtle servo?
Old 06-11-2008, 04:17 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

It depends, what are you using for a reciever? If you are using 2.4, you can put them where ever you want. If not, as far back from the ignition as you can.

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