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

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

Old 04-19-2007, 06:29 AM
  #651  
Corwin38
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Has anyone had any trouble with this landing gear? I had a rough landing yesterday and cracked the frame. Just wondering how I could reinforce it without opening up the bottom.
Old 04-19-2007, 07:21 AM
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Corwin38
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Here is a photo. The screw to the right popped loose (or rather the blind nut pulled through the ply).
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Old 04-19-2007, 07:26 AM
  #653  
Bob Pastorello
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Mine is supposed to arrive tomorrow, and I've been reviewing this thread since the beginning. FINALLY getting one.....anyway, a couple pages back I think there's a pic of a guy that put a ply doubler on TOP of the landing gear mounting ears inside the fuse, then drilled through that whole assembly to make a sandwich, if you will. I've done similar in the past, but have learned that making the gear block "too" strong really just ensures irreparable and severe damage with those "hard landings". There's a point of diminishing return building in strength....

I'll be following this closely, and looking at it hard when I assemble mine.

ORIGINAL: Corwin38

Here is a photo. The screw to the right popped loose (or rather the blind nut pulled through the ply).
Old 04-28-2007, 11:25 AM
  #654  
walterPPK
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Damn!... Just finished reading this whole thread!...

I have a YAK-54 and a DA50 at home, will start building tonight and will document all the work I do with my camera to post a complete construction sequence.

Thanks for the info.

Old 04-28-2007, 09:09 PM
  #655  
Ialwayscrash
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I reinforced mine before the first flight and have had no trouble at all with it. I fly off of ROUGH grass fields that are used for other purposes and thought that it might not be strong enough. I do not have a better picture so here goes. I hope you can make it out.[img][/img]
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Old 04-30-2007, 10:59 PM
  #656  
boex
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am contemplating the move to a gasser class plane like the gp yak54. I currently fly electric and glow. However, I was reading on rc groups a disturbing comment about the flight characteristics of the yak by none other than Jason Noll.

Here is the link http://www.rcgroups.com/forums/showt...ight=gp+yak+54

What do you guys think?
Old 05-01-2007, 12:50 AM
  #657  
Tesla1856
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Looks good.

About how thick is that large piece of ply, and is it glued to the side braces you installed.


ORIGINAL: Ialwayscrash

I reinforced mine before the first flight and have had no trouble at all with it. I fly off of ROUGH grass fields that are used for other purposes and thought that it might not be strong enough. I do not have a better picture so here goes. I hope you can make it out.[img][/img]
Old 05-06-2007, 09:51 AM
  #658  
doublesixes
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Yeah, what's with this plane? I was thinking about getting one myself but I'd like to hear some comments from pilots actually doing serious 3d with the bird before committing.
Old 05-06-2007, 08:36 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

med601
I have had trouble range checking the plane with motor on. Could not get 90 feet with antenna colapsed (per Futaba instructions) or 150 feet with one section antenna extended without serious glitching. Replaced PCM with a PPM/FM reciever..more problems became evident. I pulled the battery out of the plane, pulled the recievers as far to the rear as I could with the cables, and repositioned the antenna outside the fuse. Still would not pass range check. Friday I bought a DX-7 w/7000 reciever...still setting it up.

balance: tried to mount four servos in tail....too tail heavy so went with single rudder servo midship..have balance almost to where GP says to start at.

I also had a hard time starting 2.4 but found that Dubro fuel filter o-ring was not seated correctly.
Old 05-07-2007, 09:09 PM
  #660  
fingers73
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

My yak balances on the aft most cg, I think that is something like 5 and 5/8 inches. It is perfect almost no input needed for inverted flight. It has no adverse effect on flight, lands like a dream. all my servos are in the tail, but only one rudder servo. It flys imac and 3d awsome. My only complaint is it flys to lite weight in higher winds.
Old 05-08-2007, 08:30 PM
  #661  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

is the spark wire grounded/shielded ect. are you running a bosch type plug cover do you run noise suppressors on your servo leads,what radio are you running,engine combo how close is your ign. battery to the reciever, and ect.i have run gassers on and off for years and have never had this problem even with the magnito ignition maybe i can help you before you spend all that money on the dx7
Old 05-10-2007, 06:10 PM
  #662  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

i'm wondering if anyone here has used the thor 45cc? i recently aquired one and wanted some input. i'm planning on putting it on mine.
Old 05-19-2007, 10:02 AM
  #663  
med601
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Flyman1948,
Hope you managed to solve all your problems with radio interference.
I had the same problems when istalling my 2.4 FPE into a sig extra 300sx, turned out to be the Ridge ignition, which comes as standard on the 2.4. after replacement all was fine.
I'm curious how the 2.4 will fly the yak. I just recieved a DL50 (chinese version of DA 50 ) great engine! swings 22x8 / 23x8 props same weight. half the price. Not sure which one to install.

Question: If i am installing pull pull on the rudder single servo mid ship, can I use the rudder servo hole cutouts in the tail for my elavator? The only reason I want to do this is that it looks neater and the linkage is shorter. is there any reason why I couldn't ?
Old 06-10-2007, 12:29 PM
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med601
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I have not been very active with regards to building my yak. I'm still undecided as to which engine to use.
Flyman1948, have you flown yours yet? I would love to here how she flys with the fpe 2.4
Old 06-22-2007, 11:12 PM
  #665  
Uncas
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Has any tried this plane with a MOKI 2.10?
Old 06-28-2007, 10:06 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ok i got a question here, i just bought a great planes yak 54 and i put a da 50 on it and for some reason it balances way TAIL heavy, can anyone tell me what im suppost to do or if anyone has built one of these with a similar motor what im suppost to do

thanks

mark
Old 06-28-2007, 10:24 PM
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med601
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I'm also using a similar engine ( DL 50cc ) same weight , power and style as the DA but half the price.
I used 3'' stand off. I put a single servo in the fuse for rudder (pull pull)
That's as far as I've got , not sure where that will put me in terms of balance.
Old 06-28-2007, 10:26 PM
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med601
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Mark,
By how much is it tail heavy?

Med.
Old 06-28-2007, 10:34 PM
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med601
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Flyman,
What's happening are you flying yet?
I want some feed back, please!
Med
Old 06-28-2007, 11:42 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

i dont im scared to add weight, it feels liek it nees an engine that weighs like 2 poudns more , i thought a da 50 would be a nice match but GP says to use a fuji 43 or a 160 2 stroke glow, and i cant see how u cna get this thing to balance with a 160 glow thats for sure and a fuji only weights 8 ounces more then a da50. i know i have 4 servos in the tail section 2 elevator and 2 rudder HELP !!!!!
Old 06-28-2007, 11:55 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Mine is a DA50 also: 3" standoffs, go pull pull with your rudder servo(s)

It was right on for me.
Old 06-29-2007, 12:05 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

aww crap i already put them in now ill have two holds in the body. , i might me making a pile of crap out of a fart but the plane balances about 6.5 inches behind the leading edge, instedad of the manuals 5 1/8 i dont not know if thats a huge big deal but i dont even think if i took out both rudder servos out that it might matter, but i can give it a shot and take the two rudder servos out and see how it balances then. thanks
Old 06-29-2007, 12:50 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Where did you buy your DL 50 ?

Sounds interesting and I still need an engine for my GP Yak 54.
Old 06-29-2007, 07:04 AM
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med601
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

www.dlusa.net
Old 06-29-2007, 07:17 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

DirtRider250,
I have a DA50 in mine as well. I have 3 servos in the tail, 2 elev and one rudder. Recvr right at the end of canopy in the fuse where rudder pull/pull config servo bay is. Fuel tank is 16 oz.
At first, I used 2.5 inch standoffs as the original builder had, and I was tail heavy. I had to put 2 huge nicd packs in the engine box to balance. Then I had a mishap and rebuild the firewall, and this time, I went with the manual and measure the back of spinner plate to firewal distance as 7 1/8 and the engine was brought about 3/4 of inches forward. This helped tremendously. Now I have only a 4 cell AA pack in the engine box for ignition and my recvr pack 5AA is in the fuse behind the wing tube.

You can put some spacers on the firewall with the standoffs and bring the engine forward and remove one servo from the tail for rudder, I used a 5955, 300oz, that cust the weight of one servo in the tail. Your difference in the CG is too much, GP's recommended CG is too conservative, plane flies better at around 5 and 3/4. Hope that helps.

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