Go Back  RCU Forums > RC Airplanes > 3D Flying!
 Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine >

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

Notices
3D Flying! Our 3D flying forum is the ultimate resource for 3D flyers. Also discuss the latest in "4D" flying!

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

Old 06-29-2007, 11:57 PM
  #676  
My Feedback: (1)
 
Join Date: Sep 2003
Location: St. Peters, MO,
Posts: 744
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am rebuilding my YAK. It has a Brillelli 46 and I am going to throw both rudder servos in the rear. I had them in the middle but I think the CG was a bit forward.
Old 06-30-2007, 06:18 AM
  #677  
 
Join Date: Jan 2006
Location: little egg harbor, NJ
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

well guys, thank u for all your input, i took the two rudder servos out and put them in the middle and put one 4 .8 battery pack up front at the cowl and the other two 6 volt stacked right underneith the ass end of the gas tank, and with my C.G. machine it balanced just ever so slightly to the tail .... so when i fill the gas tank i am sure that it will balance out tipping the nose so that should do it. i never fly more then 10-12 minutes and with that da50 if i am lucky itll suck out 1/3 tank. we shall see as it debues on sunday for its first flight (or crash hehe)
Old 06-30-2007, 06:29 AM
  #678  
Member
My Feedback: (22)
 
Join Date: Jul 2002
Location: Mississauga, ON, CANADA
Posts: 75
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I have a 16 oz tank, and I fly for 15 minutes and on landing 1/3 of tank still remains.
Good luck with the maiden.
Old 06-30-2007, 12:51 PM
  #679  
 
Join Date: May 2006
Location: Tucson, AZ
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

That is why I am going to just gas eventually. I absolutely love the cost and flying time!
Old 07-01-2007, 09:35 PM
  #680  
My Feedback: (1)
 
Join Date: Sep 2003
Location: St. Peters, MO,
Posts: 744
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Flew my YAK for the first time today after replacing the fuse. I moved my rudder servos to the rear position from the original center position. (I put them in the center because I was not getting the recommended CG point.) My cowl is not repaired yet so I flew without it, which pushed the CG back further. The plane flew great. It does not fly tail heavy at all and in my mind, it fly's better, I can snap the nose up with authority and had great control otherwise.

My recommendation is that if you have a gas engine - put the servos in the tail as prescribed in the instructions and do not worry too much about the CG.
Old 07-02-2007, 08:23 AM
  #681  
Senior Member
 
Walt and Sage's Avatar
 
Join Date: Dec 2003
Location: Ellensburg, WA
Posts: 817
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine



Have 6 flights on my new Yak 54...
GPs CG in my opion is way OFF !!!
as mine was WAY NOSE heavy with a Barelli 46 GT
I am now going to balance at the wing tube and then go from there..

It is one GREAT LOOKING plane !!!!!



Attached Thumbnails Click image for larger version

Name:	Zx71173.jpg
Views:	13
Size:	83.3 KB
ID:	715030   Click image for larger version

Name:	Yt62576.jpg
Views:	22
Size:	82.3 KB
ID:	715031  
Old 07-08-2007, 09:32 PM
  #682  
Junior Member
 
Join Date: Apr 2005
Location: martin, TN
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am thinking of purchasing an GP 25% yak with a Zenoah G-38. IS this setup going to give me the power to pull out verticle from a hover or am I looking at being slugish.
thanx Dale
Old 07-08-2007, 09:37 PM
  #683  
 
Join Date: Jan 2006
Location: little egg harbor, NJ
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

dont waste your money on any motor except a da 50 dl 50 or zdz 50 or 3w, that senoah motor will fly the plane but if u want good verticle i woudlnt count on it. and for 3d yould be pissing in the wind. stick with the light highperformance motors as listed above and u will not be dissapointed.
Old 07-08-2007, 10:22 PM
  #684  
My Feedback: (1)
 
Join Date: Sep 2003
Location: St. Peters, MO,
Posts: 744
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Here is my 2 cents about the DA-50 and this plane, and really my guiding philosphy about this aircraft. If you can afford a DA-50, then why are you buying this plane? Certainly there are better 50cc planes out there than this one. If your going to buy the best engine and spare no expense, then why not with the plane too? That same philosophy can also be brought to bear on your receiver and servos.

The engine I bought was a Brillelli 46 and paid $377 shipped. It has plenty of power for this 15 lb plane. I would like to throw a 22x8 prop on it (and I have), but the gear is just a little short and ground clearance gets tight. I bought analog Hitec servos. To me, this a big plane on a budget. Further, I really think a 50cc gasser is pushing the weight envelop for this plane considering the Wing Area.

Go back and read the posts by gboulton, especially post # 449. He tried a lot of different engines, too bad he did not try a MOKI 2.10. I would have liked to have seen the results.
Old 07-09-2007, 05:04 AM
  #685  
 
Join Date: Jan 2006
Location: little egg harbor, NJ
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

yeah but a moki, doesnt throw near the prop a da or dl50 can and has no where near the bottom end torque for hovering. i mean if u just want to fly the plane around u can pretty much put anything in it that will get it into the air. but if u want to come 6 inches off the ground and hover the thing and pull out. if u put a moki in it your just gonna be playing with yorself and that plane will end up wood kindling .
Old 07-09-2007, 12:11 PM
  #686  
Junior Member
 
Join Date: Apr 2005
Location: martin, TN
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks for the input. the plane is NIB and is a package deal for $515 and I thought it was a good deal and hated to let it go. I could prob sell the motor and still come out good.
Dale
Old 07-09-2007, 09:39 PM
  #687  
My Feedback: (5)
 
Join Date: Nov 2003
Location: palm coast, FL
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Guy's,
Finally got her ready DL50, JR8211a for rudder Hitec 5625 elv.,ail. balances a littlte tail heavy @6" now moved batery (nimh 2000) behind firewall.
Had 3 flights everthing fine except the landing gear has a lot of flex which doesn't leave much prop clearence (xoar 22x8)

Is there an aftermarket gear for this plane that any one knows about?
Old 07-09-2007, 10:31 PM
  #688  
My Feedback: (1)
 
Join Date: Sep 2003
Location: St. Peters, MO,
Posts: 744
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: med601

Guy's,
Finally got her ready DL50, JR8211a for rudder Hitec 5625 elv.,ail. balances a littlte tail heavy @6" now moved batery (nimh 2000) behind firewall.
Had 3 flights everthing fine except the landing gear has a lot of flex which doesn't leave much prop clearence (xoar 22x8)

Is there an aftermarket gear for this plane that any one knows about?
A guy at the field recommended [link=http://www.tntlandinggear.com/store/shop/Product_List_Gear.htm]TnT[/link]. They sell replacement gear for a lot of different planes. I emailed them and they said they could custom add a couple inches to the Yak gear - it would add $5 to the cost, which is $66 without the customizaton.
Old 07-10-2007, 07:19 AM
  #689  
Senior Member
 
Walt and Sage's Avatar
 
Join Date: Dec 2003
Location: Ellensburg, WA
Posts: 817
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: med601

Guy's,
Finally got her ready DL50, JR8211a for rudder Hitec 5625 elv.,ail. balances a littlte tail heavy @6" now moved batery (nimh 2000) behind firewall.
Had 3 flights everthing fine except the landing gear has a lot of flex which doesn't leave much prop clearence (xoar 22x8)

Is there an aftermarket gear for this plane that any one knows about?


YES, Graphtech makes a split carbon fiber gear for the GP Yak 54
http://www.graphtechrc.com/

Walt...
Old 07-10-2007, 08:18 PM
  #690  
My Feedback: (5)
 
Join Date: Nov 2003
Location: palm coast, FL
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks,

I just ordered the carbon fiber gear from Graphtech $49. I'ts only about 1/2" taller but I can drill the axle holes 1" down. Mike from Graphtech assures me that this carbon gear will have less flex than the stock one. Let's hope it's worth it.

Med
Old 07-19-2007, 07:58 AM
  #691  
 
Join Date: Aug 2006
Location: Blacklick, OH
Posts: 289
Likes: 0
Received 1 Like on 1 Post
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I think a Moki 210 would be perfect for this plane if the weight is kept down around 13.5 to 14.5, a friend of mine has one in a 16 pound plane and it will hover around 3/4 throttle. He is running a 20x10 prop on 0% Nitro. Sounds sweet to me.....
Old 07-24-2007, 12:35 AM
  #692  
Senior Member
My Feedback: (1)
 
Join Date: Apr 2005
Location: Oromocto, NB, CANADA
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I just start building my YAK 54, I was wondering if anaybody use 23 inches prop with that plane, is ther enough ground clearance? I will be using a DL50, wich is about the same weight as a DA, for CG where should I put my rudder servo in the tail or pull pull?

Let me know.

Thanks!
Old 07-24-2007, 06:35 AM
  #693  
 
Join Date: Jan 2006
Location: little egg harbor, NJ
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I have the exact same setup as what u will be in your yak, a dl 50 and i use a 22/8 prop and i have two servos pull pull, the CG is so forgiving u can go pull pull or one rudder servo in back and youll be fine, at the moment my CG ever so slightly tips to the nose and flies great. i wouldnt go with the 23 inch prop as u will be trimming alot of grass as it is with a 22 prop. the dl or da engine in this place is awsome some say its got way to much power, i say u can never have to much.
Old 07-24-2007, 12:21 PM
  #694  
Senior Member
My Feedback: (1)
 
Join Date: Apr 2005
Location: Oromocto, NB, CANADA
Posts: 188
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks,

I will switch to 22x8 I know it will be more than enough for that plane, but because I have 23" prop, I was hopping to go that way. As far as CG I will keep the rudder servo for the end so I can paly with it.

Thanks!

By the way that DL50 is a kickass engine if anybody wonder!
Old 07-24-2007, 09:57 PM
  #695  
My Feedback: (1)
 
Join Date: Sep 2003
Location: St. Peters, MO,
Posts: 744
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

You can try but I do not think a 23" prop will give adequate ground clearance for landing. A 22" is even tight. I just got new GP gear - mine were bent so next flight I will put the 22" back on. TnT can make longer gear if you want to use a bigger prop. One thing nice about Great Planes is the spare parts are very reasonable.

twin3D - I just got a better weight estimate on a MOKI and I do not think it would be worth the trouble as you can get a 40cc gasser for about the same weight and power. So that leaves the OS 1.60 but I believe it will struggle trying to hover.

No wind at the field to tonight. This bird tracked straight as an arrow.
Old 07-25-2007, 11:30 AM
  #696  
My Feedback: (5)
 
Join Date: Nov 2003
Location: palm coast, FL
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I too have the same set up, mine is still a little tail heavy with the rx bat. infront of the gas tank.
with regard to the landing gear, the stock gear is too short even for a 22x8 I've just recieved a set of custom gear from Graphtech, 2" longer than the stock. Should be able to fit that 23x8.
Mike from Graphtech said he made a couple extra. http://www.graphtechrc.com/

Med
Old 07-25-2007, 03:36 PM
  #697  
 
Join Date: Jan 2006
Location: little egg harbor, NJ
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

my 22/8 works great 2 or 3 inces of gorund clearance, perhaps work on the landings and a 22/8 will work just fine.
Old 07-25-2007, 04:31 PM
  #698  
Member
 
Jan_Petter's Avatar
 
Join Date: Jan 2006
Location: Fenstad, NORWAY
Posts: 91
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi all,

I fly my Yak with a DA50 and a 22x10 two blade. I've have lots of fun, and no problems with clearance to the ground. I also put to much weight up front for my first flights, just to match the recommended CG. I've taken out most of the weight, and it flies even better.

Today, I experienced a real close call ! I in-flight I suddenly realized something was very WRONG. I was bearly able to salvage the plane through a very quick and somewhat tricky landing.

The investigation board had an easy task, as the picture clearly shows. Cannot blame any but myself. And I was living in the belief that I was an experienced builder...

Feel lucky that I saved my Yak in one piece...
Attached Thumbnails Click image for larger version

Name:	Pn36959.jpg
Views:	22
Size:	37.5 KB
ID:	729900  
Old 07-26-2007, 10:03 AM
  #699  
My Feedback: (5)
 
Join Date: Nov 2003
Location: palm coast, FL
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

There is just enough clearance with the stock gear but none when that gear flexes and splays as it does. You would have to nail your landings every time to avoid a strike, unfortunately I don't nail them every time.
The carbon gear I received from Graphtech was only about an 1'' taller but flexes much less and it’s lighter, cost was about $50 plus shipping. Hopefully I’ll fit it tonight and test it on the weekend.
Some DA's and DL's are stronger than others and produce more rpm, that's when the 23x8 should be used.

Med
Old 07-31-2007, 07:14 PM
  #700  
My Feedback: (18)
 
mwhar760's Avatar
 
Join Date: Jan 2005
Location: Millsap, TX
Posts: 365
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

filally finished mine,i bought a thor 45 and upgraded the ignition to the auto advance one from western hobbies,had to meld down a automotive battery terminal for nose weight,i', sure if i move the servos on rudder i can remove it,gotta get a scale to see what it weighs can't wait to fly it.
Attached Thumbnails Click image for larger version

Name:	Xv63493.jpg
Views:	19
Size:	61.4 KB
ID:	733257   Click image for larger version

Name:	Dy78121.jpg
Views:	23
Size:	58.6 KB
ID:	733258   Click image for larger version

Name:	Ty65626.jpg
Views:	18
Size:	60.1 KB
ID:	733259   Click image for larger version

Name:	Sl27266.jpg
Views:	13
Size:	64.7 KB
ID:	733260  

Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.