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

Old 03-27-2006, 07:03 AM
  #251  
Corwin38
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

FYI I found out that if you use the BCM wraparound Pitts muffler it will hit the cowl on the lower left corner. The reason it hits is because the engine offset to the left. I ran into the same problem with the TOC 30% yak and the Evolution 58GX. I was able to cut off about 1" from the muffler corner and TIG weld a 1/16" plate, otherwise you have to cut a nasty hole on that beautiful cowl.

I have a local aluminum foundry that specializes in ornamental items, and they are very good TIG welders. If you don't find anyone to do this for you I may be able to help you out and have this folks modify the muffler for you. Next week I'll post photos of the modified muffler so you can see how it looks like.
Thanks for the heads up. Can't wait to see the photos. BTW, what are other options on mufflers for this engine?
Old 03-27-2006, 01:14 PM
  #252  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Evfast, I had that exact same problem on my H9-extra 260(DA-50 powered as well) Gett her clipping along and she would wag.... Not a very comfortable feeling, I was also at the time using a silgle 5645mg back there and switched it out to a single 5955, wag is gone. That's why i put the single 5955 on this Yak...
Old 03-27-2006, 03:18 PM
  #253  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


FYI I found out that if you use the BCM wraparound Pitts muffler it will hit the cowl on the lower left corner. The reason it hits is because the engine offset to the left. I ran into the same problem with the TOC 30% yak and the Evolution 58GX. I was able to cut off about 1" from the muffler corner and TIG weld a 1/16" plate, otherwise you have to cut a nasty hole on that beautiful cowl.

I have a local aluminum foundry that specializes in ornamental items, and they are very good TIG welders. If you don't find anyone to do this for you I may be able to help you out and have this folks modify the muffler for you. Next week I'll post photos of the modified muffler so you can see how it looks like.
Thanks for the heads up. Can't wait to see the photos. BTW, what are other options on mufflers for this engine?
There are a couple other optins that might be worth exploring. [link=http://www.mvvs-canada.com/index.htm]MVVS Canada[/link] offers a custom, [link=http://www.mvvs-canada.com/moreinfo.php?pid=49]in-cowl exhaust [/link] (#3270/3271) that looks like an inverted side exhaust. They also carry a [link=http://www.mvvs-canada.com/moreinfo.php?pid=51]Canister Exhaust for the 45/58/116 cc engines (3204) [/link], and this one needs the engine to be mounted horizontally. This one is the same canister offered by Horizon Hobbies.
Old 03-28-2006, 03:20 PM
  #254  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Well guys, got the muffler modified to fit the cowl. Honestly if I would have known of the cost of TIG welding the modified muffler, I have opted for another solution. The problem is that welders in my area ask $45 to $60 an hour. I lucked out in that they charge me only $25 bucks. The muffler price is $85, plus $25 to $60. to modify the muffler will justify purchasing the Canister muffler and modifying the airframe to make it fit. As a last resort it will be more economical to cut a clearance hole in the cowl,

In any case I am not totally satisfied with the welding job. It's hard to find a TIG welder accomplished in welding real small items, with a minimum of overflow. You can judge from the before and after photos, it's not the cleanest weld job possible. If you do decide to modify the muffler I recommend to make sure the welder give you a sample weld to check his expertise, and that you get a firm price before proceeding.
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Old 03-28-2006, 06:16 PM
  #255  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Look at it this way AT.... it's going to be under the cowl anyway, so at least it won't be an eyesore untill you dork the plane in and strip it down....
I was not crazy about having to cut so much to allow clearance of the stock D/A muffler, but after it's been done it does not bother me at all, and i am quite meticulous....
Old 03-28-2006, 08:24 PM
  #256  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi guys based on the pic you provided it looks pretty good as far as the welding goes. It definately could be a lot worse looking. One option for anyone else looking for this mod may be to call Bisson Mufflers as that looks like one of their products. I believe that they do custom work for a very resonable fee. By the way I,m enjoying the thread as you guys build these planes up. Its making me seriously consider buying one.
thx Dave
Old 03-28-2006, 08:39 PM
  #257  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Well..........I didn't got that lucky with the muffler. After all the trouble I went cutting down the muffler, I still needed to cut a clearance hole in the cowl. It doesn't look that bad, but it would have looked better without the hole. There are a couple of photos so you can see how much it needed to be cut.
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Old 03-28-2006, 09:17 PM
  #258  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Nice install Airtech...

It's just a fact of life that these smaller scale planes have less room for a gasser... if there was room to fit a tuned pipe then perhaps the header wouldn't touch the cowl.

Heck even with glow versions there's pften something needing relieved for muffler, head or something...

Electric on the other hand doesn't need mufflers and almost always requires no cowl cutting at all...
Old 03-28-2006, 09:18 PM
  #259  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thats unfortunate that you had to still cut the cowl but as you say it really doesn,t look to bad. If the muffler hadn,t been cut down the cut out would definately been much larger and therefore much more obvious. It seems that on the 50cc size aircraft with round cowls having to cut them in some manner or other has to happen no matter what make the plane is.
Old 03-29-2006, 07:28 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

3D Flyer

I was thinking the same thing. I will order one tonight from Chief and let you know the results. Lets see how good you are!

Thanks for all the info
Old 03-29-2006, 09:15 PM
  #261  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

LOL! Great servos man!! And FAST!! I like them alot thus far.... I am about to use 8 of them on a 40% Carden Extra 260 that is in the covering process right now.... The titanium gear train is hard to beat!
Old 04-02-2006, 12:44 PM
  #262  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

3D Flyer

I installed a Hitec 5955 on a single pull pull and the wag is gone! The DA-50 is on is third gallon of break in and next week I will be changing from ashless to Amsoil sabre

Plane flies great but I have not tried any 3D yet, maybe next week.

Thanks
Old 04-02-2006, 01:01 PM
  #263  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Good for you! Let us know how the 3-D arena goes... this is what i am really looking forward to hearing about! Just finished my plane this weekend.... Field is still closed tho[]
Old 04-02-2006, 08:55 PM
  #264  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Flying the Yak this evening. Did a right hammer head and the rudder jammed full right. Here my airplane is fling around in this giant right skid. I flew her around awhile trying to get a feel of how she would respond. Thought sure that when I slowed it would roll over and plan dead. Believe it or not I managed a pretty decent landing. I've made worse with everything working. One of the push rods on the paired rudder servo had came loose, rotated and jammed agiant the side of the fusalage. I bet that servo was pulling the juice. I'm running 6V and I bet that was a good thing. I'm liking this plane and it is a real bueaty.
Old 04-02-2006, 09:24 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Whew... call that a lucky experience!

Definitely a good argument for a single, strong servo. Even if it came loose, you'd have a flapping rudder intead of a locked one.

My only qualm with the Competition Series designs is this "use two cheap" servos deisgn for either push/pull or even pull-pull. Seem overly complicated/heavy when there is a lot of good 250 oz in single servo choices...

Doesn't really maytter... glad you got it down! She'll fly again.

What actually came loose? A clevis pop off the horn or arm? One of the other little things I change out... using fuel tubing as keepers never worked real well for me... seems the split and fall off in no time and I always had to check them before every flight. I've since switched to Dubro Safety Lock KwickLinks




ORIGINAL: Don d

Flying the Yak this evening. Did a right hammer head and the rudder jammed full right. Here my airplane is fling around in this giant right skid. I flew her around awhile trying to get a feel of how she would respond. Thought sure that when I slowed it would roll over and plan dead. Believe it or not I managed a pretty decent landing. I've made worse with everything working. One of the push rods on the paired rudder servo had came loose, rotated and jammed agiant the side of the fusalage. I bet that servo was pulling the juice. I'm running 6V and I bet that was a good thing. I'm liking this plane and it is a real bueaty.
Old 04-02-2006, 10:25 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I lost my breath reading about your experience! I am so happy that you landed it in one piece.

ORIGINAL: Don d

Flying the Yak this evening. Did a right hammer head and the rudder jammed full right. Here my airplane is fling around in this giant right skid. I flew her around awhile trying to get a feel of how she would respond. Thought sure that when I slowed it would roll over and plan dead. Believe it or not I managed a pretty decent landing. I've made worse with everything working. One of the push rods on the paired rudder servo had came loose, rotated and jammed agiant the side of the fusalage. I bet that servo was pulling the juice. I'm running 6V and I bet that was a good thing. I'm liking this plane and it is a real bueaty.
Old 04-02-2006, 11:02 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Push rod connector on the servo arm. The metal retainer clip came off. Stayed attached to the rear servo, so when it rotated around with full servo deflection, it jammed agianst the side of the fusalage.
Old 04-04-2006, 08:45 AM
  #268  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech,

Haven't seen any posts from you in a while. Just wondering if you have flown yet?

BTW, what kind of fuel line setup did you use?

Thanks
Old 04-04-2006, 03:49 PM
  #269  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech,

Haven't seen any posts from you in a while. Just wondering if you have flown yet?

BTW, what kind of fuel line setup did you use?

Thanks
Corwin,

I am almost done with the airframe, but I am waiting for the batteries. As soon as I receive the batteries I'll be ready to maiden the Yak. On the fuel setup I am going with the stock recommended setup from GP. That is a three line system with the supplied tank in the stock location. I have been using a three line system in all my previous gassers because it's very simple to install, don't need a fuel dot, and don't have anything that can go wrong. From the photos you will notice the breather line looping around the top of the tank so there is no gas spills during extended downlines. The breather line and the fill line exit through the bottom of the cowl air exhaust opening, and the fill line is capped with a fuel line plug
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Old 04-04-2006, 04:04 PM
  #270  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

The fuel tubing on top of the tank is a good idea, i have done this with all my planes, another way is just to run it to your wing tube and loop it around a few times....
Lookin good AT, be sure to let us know how the maiden goes.....
Old 04-04-2006, 04:07 PM
  #271  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Airtech,

What Evo engine is that? New to gassers, but I noticed the fuel tank lines don't look like they have barbs on them??

Mac
Old 04-04-2006, 04:23 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Airtech,

What Evo engine is that? New to gassers, but I noticed the fuel tank lines don't look like they have barbs on them??

Mac
Mac,
That's an Evolution 45GX. You are right, don't have barbs on the outside tubing. I soldered barbs in the inside tubing but ran out for the outside. I should get more together with some other hardware I have on order. The tank is very easy to remove with the use of velcro tie downs, so it will not be aproblem to update later.
Old 04-04-2006, 07:19 PM
  #273  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

sorry if its already mentioned earlier in this thread, but is there a video of this plane available?
Old 04-04-2006, 10:24 PM
  #274  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

sorry if its already mentioned earlier in this thread, but is there a video of this plane available?
I don't think there are any. I'll love to see one myself. I will try to record one when I maiden mine.
Old 04-05-2006, 06:26 AM
  #275  
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey AT,

Thanks for the info. Is this the setup? No line to the pressure fitting on the muffler, right?
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