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RE: QQ 85" Yak - 9/27/2005 1:35 AM   
wgeffon



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quote:

ORIGINAL: mxcop114

Wayne I agree about the cg thing with the harriers. I have found that this plane will rock if you are not at the right high alpha attitude. I moved the cg back a little with no change. I then changed evevator throws a little along with different throttle settings and found the locked in attitude. It almost makes you think it wants to go into a hover at first but if you keep it going it locks in solid. It is more high alpha than my smaller planes in a harrier but I have noticed that the larger planes seem to like more vertical attitude.



Yeah. Its just a matter of finding the sweet spot. Once you are there and can find it again, its easy.



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RE: QQ 85" Yak - 9/27/2005 3:53 AM   
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Hey Ted,
I just drilled holes and put ca in them, then screwed the filler in. They have showed no signs of coming out so far and it seems secure in the fuse. I wish the filler came with a back plate, it would be much easier to install. I may make my own if the screws start to back out.

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RE: QQ 85" Yak - 9/27/2005 4:01 AM   
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Guys I think my post was taken the wrong way. In no way did I mean you can't be on here unless you have this plane. I'm just so tired of hearing the same thing about one plane being better than the other, it's not just here it's everywhere. I go to my club field and deal with this all the time. Nothing personal against anyone here. From what we are starting to see it looks like these planes are all very simular to each other actually, and alot are coming from the same factory. Again, sorry if someone took it the wrong way, I just hope this forum can be positive.

Lee


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RE: QQ 85" Yak - 9/27/2005 4:53 AM   
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quote:

ORIGINAL: wgeffon

I have said this before...

It is possible to have more than one great flying plane in the same size range.
I have no doubt the QQ Yak is an outstanding plane.
As soon as Lee lets me wring his out I'll let you know what I think.


Wayne, YES YES YES - I'm just really hoping that you kick tail in Tucson, so that you are in a really good mood and hence don't need to take out any frustration on my poor little QQ... I like the idea of you wringing it out, but not so much putting it through the ringer....

Manteno, dude. 2 weeks. Be there.

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RE: QQ 85" Yak - 9/27/2005 5:17 AM   
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Lee, I don't think anybody was trying to say the QQ Yak was not as good as another. The EF Yak is one heck of a plane. Sadly they are not available. Speeking for myself, and maybe some others, I was just trying determine if the QQ Yak could be build with simular equipment (especially the Da50, I refuse to hang a heavy 3W on it.) ballance without any problems like adding weight to the nose, and fly simular. Judging from what I have seen, I firmly believe it will and will be prowd to own and fly a plane with QQ's name on it. The man is unbelievable!
I have not considered a TOC Yak because in my opinion they are as ugly as my grandmothers couch from back in the 60's Good lord, they look like a bunch of 3rd graders picked out the colors!
John

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RE: QQ 85" Yak - 9/27/2005 1:41 PM   
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quote:

ORIGINAL: RCAddiction


Manteno, dude. 2 weeks. Be there.



That should work. You thinking the 15th or 16th?
And, I am always in a good mood..


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RE: QQ 85" Yak - 9/27/2005 2:11 PM   
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Hi Lee

Thanks for the reply re the fuel dot. Yes too bad it doesn't have a backing plate. This is the first DA fuel dot I have used and I thought I was missing a part, until I went back and studied their web site closer. I think I may try to fabricate a backing ring. I am hoping that this plane will last me throught the next two classes in IMAC.

For what is is worth, I have seen the exact same plane flown by a less proficient pilot and the same plane flown by a very experienced pilot. To see the two flights, you would think they were two different planes.

I wanted a QQ yak because of Quique's experience, reputation and what I think would be his desire to provide an excellent aircraft to the community. After all is a very visible individual. From what I have seen during the assembly so far, I am not disappointed in the least.

Ted

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RE: QQ 85" Yak - 9/27/2005 2:24 PM   
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quote:

ORIGINAL: Ted5660

For what is is worth, I have seen the exact same plane flown by a less proficient pilot and the same plane flown by a very experienced pilot. To see the two flights, you would think they were two different planes.



This is exactly why I don't put a ton of faith in most videos of planes. It's hard to tell if it's the plane or the pilot. There's a Yak video out there which made me question if the plane was any good at all, based upon how it was being flown. I couldn't really tell! There are a lot of 3D stick bangers out there, who are surely enjoying what they do, but many of whom fly bit sloppy and don't make planes look all that impressive. The pilots I've have the pleasure of meeting who've gone up the IMAC or Pattern ranks in precision flying are also well capable of 3D, and they make planes look great in both modes. Wayne is a case in point. So are McConville, Somenzini, uh....all of the worlds top pilots as a matter of fact.

On the downside, those guys can make even a trainer do awesome stuff.

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RE: QQ 85" Yak - 9/27/2005 4:35 PM   
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I'll back up the pilot statement... I had (yes...HAD) an Edge 540 that I just didn't like... Just never seemed to fly well..... I asked Andrew Jesky to fly it for me to see if it was me or the plane......

Beautiful rolling circles... harrier done looow on the deck... great flight.... after landing, I asked him to tell me straight...is it the plane or me....

He said the plane was awful! (boost to my confidence!)
I sold it!

Moral of the story... videos on the internet are great,,, but there are people who can fly a brick with an engine and make it look great!

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RE: QQ 85" Yak - 9/27/2005 5:05 PM   
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Hello all

I am completing assembly QQ 85. Interested in opinions re cowling cut out in the front with DA 50. Since the head of the engine extends out the bottom of the cowl and the front is exposed via the front cut out in the cowl, I am wondering weather need to further weaken (and esthetically disturb) the ring of the cowl where the front cowl ring still obstructs about 1 inch of front of cylinder profile? Should more cowl be cut out in the center section of the front of the cowl? Should baffling be added inside the cowl? Obviously these questions all have to do with the issue of adequate cooling - particularly in view of planned 3D high engine stress flying. Interested in opinions, and particularly feed back from anyone who is flying QQ 85 and monitoring engine temps.

Thanks
RJM

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RE: QQ 85" Yak - 9/27/2005 5:30 PM   
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I agree videos can easily fool you. We will just have to wait for more people to get the plane flying and put all opinions together, all skill levels, and see what we all come up with. We all have our own opinions and like different setups. We will just have to wait and see.

Lee


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RE: QQ 85" Yak - 9/27/2005 5:35 PM   
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I didn't cut out that area because the head hangs below the cowl a bit. I think that is more for the 3w engine, which sits back inside the cowl more than the da. I haven't had any cooling problems and have been doing alot of 3d flying lately with it. I don't think you have to do anything special since the cowl is so open on the Yak.

Lee


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RE: QQ 85" Yak - 9/27/2005 7:33 PM   
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Harddeck,

I'll post a pic tonight; but I left about 1/2" of cowl ring on the bottom and still got my prop to be at least an inch from the cowl. I used 3" of spacing standoff from the firewall. The cutout as you will see is very clean and very close to that pictured in post number 137.

I have used both a throttle and choke servo mounted unside down inside the engine box because it was the easiest thing to do. The ignition switch is a real problem because I want to have both the switch and charge jack easily accessable. I haven't done it yet, but I'm thinking about mounting the ignition switch in the lower corner of the cowl. My fuel overflow vent comes out a notch in the bottom of the cowl; I haven't decided on were the fueling hose will go yet.

Here are the pics of my frontend.

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< Message edited by splais -- 9/28/2005 4:09 AM >


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RE: QQ 85" Yak - 9/28/2005 3:04 AM   
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Well.... a phone call, couple of emails, and Wayne is shipping one of these beauties to me tomorrow!!! I could NOT believe that he had one, but he says he has a couple where folks passed on there chance.... so ... if there's anyone who needs a fresh one - he still has a couple as of tonight!

There is already a wealth of info on this thread; I appreciate it all, and look forward to doing mine .... BME 50, JA Pitts, JR 8611's.... should be a good one, I think.

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RE: QQ 85" Yak - 9/28/2005 3:33 AM   
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I'd be very interested to know if anybody is installing a DA50 with the stock muffler and how it fits in the cowl. Anybody???

John

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RE: QQ 85" Yak - 9/28/2005 5:28 AM   
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John, go back and read post #84.

I initially thought the stock muffler would just barely fit. It just clears the 10" cowl diameter as you can see in post #84. The problem is that the front 5" of the cowl begin to curve inward, reducing the diameter where the muffler would need to be sitting.

I laid it out after I installed the engine and tried the install. Yes, you can get close to getting it inside, close, but no cigar. You will have to make a large cut out to clear the front half of the expansion chamber. This cutout is fairly high up on the cowl and toward the front, so it will be more noticeable than the Slimline Pitts or J&A Peacekeeper Pitts muffler which require bottom rear cutouts. The J&A requires less cowl cutout than the Slimline because the expansion chamber is smaller. You can see my other posts with photos of this installation.

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RE: QQ 85" Yak - 9/28/2005 2:34 PM   
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Lee, thanks fot the reply. Going back to post 84 I see what I feared. And the pictures a few posts ago with a DA50 show a cowl that has been significantly weakend by cutting into the radius (rounded portion of the front of the cowl) is there a reason this engine needs to stick out so far?

ON my EF Yak the distance from the back of the spinner plate to the front of the cowl is only 3/8 inch I don't know what the distance is on the QQ but from looking at the pictures it appears to be about 1 1/4 inch!
Certainly if shorter standoffs were used you would not have to cut the cowl into the radius. I suppose this is going to be a ballance issue, but would moving the engine back even 1/2 inch make that much of a difference in the ballance? And maybe then the stock muffler would fit?

I like the stock muffler, it makes more power and is lighter. a combination that is hard to beat unless noise is an issue

John

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RE: QQ 85" Yak - 9/28/2005 3:21 PM   
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Just measured my EF cowl, 10 1/2 inches. If indeed the QQ yak is only 10 inches then I'm guessing a clean installation of Da50 and stock muffler will be very difficult if not impossible. But who knows, maybe somebody can figure it out, I hope so. I thought I read in an earlier post that QQ himself was going to install the DA 50 in his plane and get back to us with the results. I hope it's positive, and I hope he can figure a way to get the stock muffler in there as well.

I don't want to start an engine fight, but would it be correct to say that most people buying this plane would rather use a Da50 or some other engine before the heavy 3W?

John

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RE: QQ 85" Yak - 9/28/2005 3:26 PM   
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Here are a few pix of the just finished Virtual Cockpit made especially for the 85 inch Yak. This one is for a friend in Canada. He sent me the entire canopy to make the kit fit perfect. I also selected a pilot bust for the best presentation. I have lots more pix showing the building process if anyone is interested. This kit weights less than 3 oz not including your pilot bust.
Thx,
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RE: QQ 85" Yak - 9/28/2005 3:38 PM   
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I am getting my QQ Yak shipped today, and I *want* one of these setups.... please let me know how to proceed, and the cost. If you accept PayPal, include the email to send payment to, and I will do that.

I *REALLY* like what you're doing with these!!!!

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RE: QQ 85" Yak - 9/28/2005 4:04 PM   
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jrjohn,

The issue of how far the engine should stick out of the cowl is not related specifically to CG. It is related to performance. It has been demonstrated that you require a certain amount of clearance between the prop and the cowl on these big round jobs if you want to get optimum performance. I believe QQ has stated that something like 43mm of clearance between the black part of the cowl and the prop provides the required performance increase. This gives you about an 1" of space from the prop to the leading edge of the cowl. If you look at the cutout of my cowl a few posts above, I have not weakened the cowl ring at all and achieve the necessary clearance. As a side not, as mentioned elsewhere, if you look at a picture of the real Yak there is substantial clearance between prop and cowl.

Kregg,

I had noticed that one canopy cross brace that sticks up to far back to be covered by the center console as it does on the 102" Yak. But some judicious use of paint should almost make that cross brace disappear into the graphic. I'll let you know when mine is done.

Anyone interested,

If you are going to install a pilot and the virtual cockpit go to this link http://www.rcuniverse.com/forum/fb.asp?m=3260702 Post #466, Page 19 of the 102" Yak thread for pics of how I did it. This method has proven very light and bullet proof. After many flights nothing has come loose.

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RE: QQ 85" Yak - 9/28/2005 4:15 PM   
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Splais, Your right about the scale Yak having the prop further out. I noticed that at the same time that I noticed the 4 inch spinner guys were using on the EF yak were out of proportion. 3 1/4 inch spinner was more scale.

As I said earlier my prop hub is only 3/8 inch from the cowl. performance is great. But maybe there is some distortion to the airflow over the control surfaces? I guess we'd have to try two different setup to see if theory really matters on this model, unless it was already done??

I guess I question this a little because my cowl is 1/2 inch wider than the QQ cowl, thus you would figure having the prop only 3/8" from the cowl would have even more of an effect on the performance. The working part of the prop is well past the cowl. I forget the figures but I learned that the highest percentage of work is done by the smallest percentage of the prop. (the tips)

John

< Message edited by jrjohn -- 9/28/2005 4:25 PM >


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RE: QQ 85" Yak - 9/28/2005 4:24 PM   
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Splais,
You are right about that ply section. It is right in the middle of the rear pit area. I think it looks great even with this part unpainted. It would look even better if you painted or used a marker to disguise this area. My kits are just that, KITS, The installation and assembly can be completed how the individual wants to. I just give suggestions on how I would do it. Its like assembling the ARF. It takes some effort and patience for the best final presentation. You did an excellent installation in your 102 version.

If you look at the cockpit pix above and below you will notice that the "Jon" pilot bust I bought from www.litepilots.com was cut way down to fit inside this canopy. It requires thought to get him inside the finished canopy. This larger 33%-35% pilot bust looks very nice and in scale once modified for the installation. You could go smaller, but that would be a personal choice. I think the 25% Tony pilot bust is to small for this aircraft. I'm sure someone makes a 30% size that would also work. Just be sure and get a red shirt to match the arms.
Thx,
Kregg

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RE: QQ 85" Yak - 9/28/2005 4:39 PM   
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quote:

ORIGINAL: jrjohn

...But maybe there is some distortion to the airflow over the control surfaces? .



I believe the distance here is for cooling improvement and not prop performance, but I definitely could be wrong. I know that the general consensus on the EF(and my KMP) is about 1/2", which I have mine at and the cooling is great, but if it's a prop performance issue then I have no idea what to say.

*** Ooops, I was wrong.

I'm sure most of you guys have this, but for those of you that don't, or for easy reference, here's the statement directly out of the QQ manual concerning this issue: "The engine has been place as it is for maximum prop performace as it is the full size airplane. If you move the engine back you’ll shift CG back and loose prop efficiency."

Below is a decent side view of the real thing.

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< Message edited by bpryor -- 9/28/2005 5:00 PM >


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RE: QQ 85" Yak - 9/28/2005 4:48 PM   
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In order to clear the stock muffler, you'd need to move the engine back at least 2-3 inches to get the muffler to where the cowl is not beginning to taper. That's not really feasible. Splais and I both have used 1/2" standoffs (in addition to the stock 2-1/2" DA), which is 1/4" less than the 3/4" wood standoffs. This will slightly strengthen the "chin" on the bottom of the cowl where you have to cut to clear the cylinder head. And the 1/4" shortened standoff distance puts the prop exactly where it was located for the 3W50 that the plane was designed around.

3W50 - until VERY recently, QQ was sponsored by 3W, hence his use of this engine in the prototype development and the manual. QQ is now a DA sponsored pilot.



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