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

Old 12-22-2005, 10:35 PM
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Hajduk
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I like the way that Yak looks like! It might just be my next project for the next summer flying season.
Old 02-01-2006, 08:40 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Four rudder servos? Two in the tail section and two pull-pull's? I don't understand ...




Old 02-01-2006, 08:49 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

That is weird. It really only needs one on the rudder.
Old 02-01-2006, 09:10 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: Flyfalcons

That is weird. It really only needs one on the rudder.
Not if you are running standard 3004's [sm=lol.gif]
Old 02-01-2006, 09:27 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am planning to buy this Yak. I would like to start buying servos, however, since this yak will be my first big airplane, I am not sure how strong of servos do I really need.

I am planning to put Hitec 5925MG on ailerons, elevator and rudder. These digital servos develop (advertised) 128 oz. in. of torque at 6 volts. Is that enough torque for this airplane?

I am planning to fly IMAC and 3D stuff.
Old 02-01-2006, 09:40 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hadjuk, I would recomend a Hitec 5955 TG on the rudder if you want to do serious 3D. Your 5925's should work well everywhere else. Good day, from Henderson, Tx.
Old 02-01-2006, 09:40 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Great Planes did this same "servo strategy" on their Ultimate. Goldberg has done the same thing on their 77" Yak. I think the ARF makers are wanting us to re-kit the airplanes by suggesting that we employ more servos with lower torque to consume battery power faster, add complexity and failure points/modes, and permit the shoestring flyer to be able to say he "had" one of the Giant Scale Yaks....

Seriously - using MULTIPLE servos, particularly of lower torque value, just doesn't make ANY sense to me at all. I would use the Hitec 5945's, if you can get them. Plenty of torque, coreless, digital, very precise. Or buy the JR equivalent (8411's or 8611's) or the Futaba equivalents (have NO clue, as I don't use brand F).

Definitely - MANY people share this simple "rule of thumb"....Your servos should cost about as much as the bare airframe. Or put another way - buy the BEST that you can afford, just like you pay for your airborne battery, and your Rx.... those are three areas where it just is NOT smart in the long run to "go cheap"
Old 02-01-2006, 10:26 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi Torqmeister,

Thanks a lot! I am in Longview, Tx and it rains here at the moment.
I assume you meant one 5955TG not two for the rudder setup?

Regards,
Old 02-01-2006, 10:44 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi Aerobob,

I hope you have a lot of fun with your Goldberg Yak 54 -77”. I hope I will have as much with my Great Planes Yak.

I was thinking 5925MG because they appear to be the fastest digital (relatively) high torque Hitec servos. I am thinking to go with 5925MG on ailerons and elevators, and maybe, as Torqmeister suggested, with a single 5955TG for the rudder setup.
Old 02-01-2006, 11:58 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hajduk,
Go with the JR DS 8611A sarvo 240 in/oz. @ 4.8v metal gear. You'll only need one for each surface and you could easily put them into a larger plane in the future. Towwer is showing the Yak for $399.99 available late Feb. Also has a weight range of 12.5-15.5lbs. Not exactly a light weight. My 27% Edge 540T with a Brison 3.2 is 16 lbs. 12.5 lbs.sounds good but 15.5? It does look like a nice plane though.
Remember, you can always thorttle back.
Jeff,
Old 02-02-2006, 01:42 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I was looking at the weight of Great Planes (GP) Yak and from what I could see is not much heavier (if any) then the other Yaks on the market. Now, I am not an expert flyer and don’t know much about the wing loading. I wonder how GP Yak wing loading compares to other similar size Yaks?
Old 02-02-2006, 01:50 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

1)I think the BME55 will be the motor for this size plane.(when it comes out)

2) It does not look like this plane has removable horizontal stabs?

3) It does not look like this plane has air foiled tail feathers?

4)The hardware in the picture looks sub standard for this size plane.
Old 02-02-2006, 01:56 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

With 3 more servos on the rudder than needed that equals around 6 oz. of dead weight. I wonder if it will even balance without all of that weight?
Old 02-02-2006, 02:11 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Wow. This is gettin' REALLY funky/weird.... more cabling and pushrods than a Wright Flyer....and that same REALLY funky tailwheel they landed on for the Ultimate (mushy, mushy). Maybe the stabs mount like the Wagstaff extra, with screws out near the ends of the tube?

We need to see more pics.... somebody out there has to know more....
Old 02-02-2006, 02:16 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: aerobob

Wow. This is gettin' REALLY funky/weird.... more cabling and pushrods than a Wright Flyer....and that same REALLY funky tailwheel they landed on for the Ultimate (mushy, mushy). Maybe the stabs mount like the Wagstaff extra, with screws out near the ends of the tube?

We need to see more pics.... somebody out there has to know more....
Without the horizontal stabs air-foiled I do not think they are thick enough to hold a rod?
Old 02-02-2006, 03:13 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

The stab looks airfoiled, look at the stab area inboard of the counterballancer, it's airfoiled. Look at the parts pick, what is the small black strip/rod? Is that for the stab? Stab is shown as one piece, and the fuse does not have it cut out.....this is weird. I think that I can justify the Lanier Yak now, DA50 or ZDZ60 no problem w/ the 1460 squares. The Goldberg/GP dual / QUAD servos is stupid....sorry for getting to the point.

Thanks for pointing out the junk tail wheel.... that's another $20 to replace.


Anyone think H9 will produce a Yak?


Mac
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Old 02-02-2006, 03:22 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: The MacDaddy

The stab looks airfoiled, look at the stab area inboard of the counterballancer, it's airfoiled. Stab is shown as one piece, and the fuse does not have it cut out.....this is weird.

Mac
Yep you are right. Air-foiled, but not removable. Thanks for the info. You would think that Great Planes could get it right, wouldn't you?




Old 02-02-2006, 03:28 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

THat's classic "covered over" stab cutout technology - just like the Ultimate. The gluing in is fine, if it's airfoiled, and it appears to be.
In the Ultimate thread I discussed how I modified the tailwheel to make it workable, and it was fine after.
For me, the real issue is the apparent insanity on the servos.... and my Goldberg Yak I'm running ONE JR 8411 per aileron, and it's just dandy so far.
Old 02-02-2006, 03:32 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

If this was the plane I was getting (its not) here is how I would outfit it

--Saito 2.20
--Fromeco Peerless Li-ions
--CF wing tube from TBM (I assume the wing tube wont be some funky diameter)
--CF tail wheel from graphtech
--ONE hitech 5955 on the rudder (Pull Pull)
--Hitech 5645's everywhere else
Old 02-02-2006, 03:36 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

southern_touch - that would be a very capable setup, I think. Probably even balance okay.... the 220 would be a hoss on that airframe, too.

Based on the Ultimate, I really think this will probably be a very good quality ARF, and reasonably-not-heavy, if powered correctly.
Time will tell, though, as I'm personally (as a guy that has FIVE Yaks) am wondering what the saturation point of our market is.... exactly how many DIFFERENT Yaks *DO* we need?????
Old 02-02-2006, 03:39 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

No, not really. I might be done with GP. Last 2 planes have been H9's, Funtana 90 and Showtime. You should see the hardware for the ST! It's stuff from the Extra 260.... removable stab, ball links, fin is part of the fuse, cf (looking at least) tail wheel assembly, single bolt control horns.... man this winter is killing me. $259 less my 10% discount at my fav LHS

Got the Saito 125 for that job. YS 140 in the F90 (F140?)

BTW, how can you gang 4 standard servos together, 2 on pull pull and 2 on push pull??? That would be a nightmare for set up... I wish the assembly manual was available.... might make some good reading.

Mac
Old 02-02-2006, 03:41 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: aerobob
Time will tell, though, as I'm personally (as a guy that has FIVE Yaks) am wondering what the saturation point of our market is.... exactly how many DIFFERENT Yaks *DO* we need?????
Just 1 good one @ 45", 60", 68", 74",87" & 107"
Old 02-02-2006, 03:50 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

The manual probably reads something like "Adjust all control rods/clevises to minimize binding"
Old 02-02-2006, 03:55 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

So you do have the manual
Old 02-02-2006, 03:58 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am **ALL** over that, I'm only missing the 107" version, STG, and that is ONLY because I know ---- for certain ---- that once I go THAT big, it will be ALL over..........house, shop, wife, $$$, transport mode ..... you know.....

I'm guessing about the manual, guys..... although it probably is equally succint about CG and travels.... you know, "Adjust to suit your preferences and flying style" (personally, that's my ALL TIME favorite in manuals....)

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