Aeroworks Yak QB Series problem.

[JBenson]

Never mind, read above posts. Sorry for your loss.

JB

[brandonduley]

	Quote: Originally Posted by JBenson
	I can't even find CS 150 servos on the web. Are they Cirrus servos? I have built/flown/owned serveral Aeroworks planes and never had any concern about weak wings. An inadequate servo could cause this damage due to flutter. How much torque do these servos have? Which size Yak is it? I have dealt with Rocco on several occasions and he has been very fair. I hate to see your plane lost like this. More details please. JB

i found them on tower hobbies website. They are made by Hobbico and i think they had around 190oz of torque @ 6V

[rcflyguy]

We had a wing go 90deg at or field... funny, it looked almost identical to this one... it happend very fast.

It was an Aeroworks also. Did you do this? From the manual.

"Always check for good fit of the wing attachment
bolts. We recommend using cotter pins through
the aluminum anti-rotation dowels for a second

method of security"


If the bolt stayed in, the blind nut would still be on the bolt... or the bolt would have ripped thru the side of the fuse. From what I see in the pics... the blind nut is still in place and the hole for the bolt in the fuse is not broken out... Sorry but your bolt backed out.

[luv2flyguy]

I have two AW planes and have had no problems, not to say that this was'nt faulty workmanship, just think about it, in any product their will be some that slip through QC and should have never gotten to the consumer. However I am dissappointed with the way that AW is handling this.

[bubbagates]

This looks a lot like my first AW50cc Yak. One thing I cannot tell was the clear covering that they supply installed on the leading edge. I ask this because I had one from the first run and had a wing blow apart in flight. We heard what we thought was flutter coming out of a very slow loop. I almost was able to get back to he runway but as the wing continued to destroy itself flying it went from OMG to holy sh^%&^(t quite quickly

After inspection we discovered the covering lifted (hence the flutter we heard) and literally destroyed everything in the wing. The covering even had balsa shards on the backside still glued to it.

At first glance everyone thought the wing came loose from the bolts as thje tube looked like yours.

Now I'm betting the first thing AW looked for was that clear covering and if it would have not been there they certainly would have told you about it.

As far as servos I cannot say how well those hold up

In my case I spoke to Rocco for well into one hour and in the end I got a new plane at a greatly reduced price and no shipping costs. Part of the reason he felt it would be impossible to tell if it was me or manufacturing issues so I bit the bullet and got the second one and flew the crap out of it. Finally destroyed it on a hard crosswind landing. BTW, the call was very pleasant on both ends.

I swore I would never get another one do to the excuse I got as well and not wanting to honor what later turned out to be a manufacturing defect. I know because one month later I got what was needed to fix the leading edge issues. I like the QB series, though they are a bit heavy and many times I have gone almost all the way through the order process and then my memory kicks in

[sonito]

Guys, thanks this kind of forum will reach the powers to be at Aeroworks and if they continue with the shotty customer service I would rather buy a plane from GP or Horizon becuase of the excellent customer support The plane looks nice and I chose it becuase of the fact the plane looked good but after all this as I mentioned before it would put a sour taste on hotdogs on the grill after I used it (another AW product) at an IMAC cook out.

Now the fact that they were curtious and all but the run around and the we will get back with you for a week was not right so with all this said the ball is in Aeroworks court lets see what they have to say now.

Thanks again I feel alot better now

[sukhoi26mx]

	Quote: Originally Posted by Altavillan
	All the evedince is there. The wing was seperating from the plane. The polished end of the wing tube and the frayed phoenolic tube end shows how long it flew till the wing bolt vibrated all the way out and poof the wing went 90* and exploded.

I tend to agree with this analysis. I also agree that the little plastic servo arms are insufficient for this type of app.

Scott

[tommy321]

	Quote: Originally Posted by rcflyguy
	If the bolt stayed in, the blind nut would still be on the bolt... or the bolt would have ripped thru the side of the fuse. From what I see in the pics... the blind nut is still in place and the hole for the bolt in the fuse is not broken out... Sorry but your bolt backed out.

I agree that if flutter was the cause, the fuse and wing root would have been ripped to shreds by the wing retention bolt. In the picture it looks like the wing root rib is undamaged aft of the wing tube. I can't tell from the picture if it's still firmly attached to the wing though. I think the wing bolt backed out first, allowing the wing to slide out and rotate in flight.

Either way, that really sucks! Hope you can get flying again soon!

Tom

[lazyboyflyer]

Sorry, for your loss! But looking at the photos shown, I think your wing bolt backed out, wing vibrated out and rotated, then it came apart in the air. I don't believe flutter had anything to do with it. Like you said, you would have noticed flutter before it happened. Again, sorry for your loss.

[IMACmike]

sounds like failure to me, too. Nylon servos arms are no good on a 35% A/C. Speaking from experience, aileron flutter will cause a catastrophic failure in the wing in the blink of an eye! And again, speaking from experience with Aeroworks products, my 35% AW QB 260 (#16 of the first run or second run) had the entire LG block pull out on the first landing, not because of a hard bounce, but because there wasn't any glue holding it into the formers! Andy 540t was there and was amazed at how clean everything tore out. A new muffler, CF prop and a pair of new wheel pants later, everything glued back together just fine. Rocco's response after viewing about a dozen photos, "I see some glue here...", but it's not our fault. In the guy's defense of customer service, he sent out new parts (LG, wheel pants, etc.) and was helpful on some other preventative work to do (admission of guilt?) that others customers have suggested to do. I feel your pain, but I don't think the airplane is at fault. BTW, although I personally will not buy another AW arf (iprefer to build), they are probably the better flying ARF's out there. JMTCW

[Mithrandir]

Rather then the wing bolts backing out, there could be another explanation... and that is the tube was free to shift from left to right, over time.. over several flights The polished marks are where the ribs exerted pressure thru the glass tube onto the alu tube.. so if the aluminum tube shifted far enuff to one side, the end of the aluminum tube will not engage the Plywood rib. The length of the polished zones suggest a couple inches of side to side freeplay.. and the extent of the polishing suggests this went on for longer then a single flight....
I would suggest the aluminum tube was not adequately constrained in a side to side manner and the end slipped until it no longer engaged the outer plywood wing rib.

Sorry for the loss... I guess we should all routinely verify the tube will not slip too far into or out of a wing panel... checking to make sure the tube stop is in place and secure should be done fairly often.

PS.. I have 220 flights on my SX and 80 flights on a 42% WM Ulti with the S9152 FUTABA DigiServos and NYLON ARMS!!!
Not all nylon arms are created equal.

[Josh Price]

guys I have heard of several aw planes having problems. BUt I have also seen and heard of QQ's wing problems Comp arfs wing problems even the 260 from horizon had rumors of problems. I have been flying my 35% like I stole it with some of the most vilent moves you can do and the plane looks like it is brand new. I have meet with rocco and talked to him several times and he seems to be as nice as can be.
You have to remember that to him this is a business and you can not make money giving a free plane to every guy that calls you up and says hey your planes are junk. Too me it looks like the wing bolts came out the wing rotated and boom there went the wing. There is no damage to the wing root and if it was a wing prob. from the factory the wing would have at least the out side spare still on the plane. dont get me wrong I would be mad as hell too if I just watched my plane go in with only one wing on it and if all the rumors had been going around like they have about wing failures on the AW planes that would be the first thing I would be thinking. but this shows none of the signs that the others have before that came apart and the company came forward about and no I am not saying just AW, but all the companies. I just thought I would throw my 2 cents in and say that my 35% is as tuff as a nail flys like a bat out of hell and and has no signs of wear the best i can tell. hehehe Lomchivacs 150 is the same ask him about it I rang his out like there was no tomorrow and it flys great. heck he had a little accident this week end on a dead stick over shot the run way and crashed in to a fence row full of real viney brush stuff and and it had no damage at all. NONE! I told him we were leaving right then and going to go buy lottery tickets. I hate to here you unfortanate luck but I love mine

[rcflyer777]

I could be wrong, but I believe the wing bolts are black plastic which would blow all the conversation about the wing bolts backing out right out the window. They would have just snapped off when thw wing came apart. And if AW suggests pinning the anti-torque posts, why don't they drill them and include pins with the kit? It tells me there is a recognized design flaw.

[bubbagates]

	Quote: Originally Posted by rcflyer777
	I could be wrong, but I believe the wing bolts are black plastic which would blow all the conversation about the wing bolts backing out right out the window. They would have just snapped off when thw wing came apart. And if AW suggests pinning the anti-torque posts, why don't they drill them and include pins with the kit? It tells me there is a recognized design flaw.

When I had my second one the aluminum anti-rotation pins were drilled and came with hairpins, 2 each per wing and the bolts were 6-32 with rubber backed washers, again 2 each per wing. The first ones did not have the hairpins but the kit that AW sent included what was needed to strengthen the gear mount, add the clear covering to the leading edges and instructions on how to drill the anti-rotation pins and install the hairpins

[sukhoi26mx]

	Quote: Originally Posted by rcflyer777
	I could be wrong, but I believe the wing bolts are black plastic which would blow all the conversation about the wing bolts backing out right out the window. They would have just snapped off when thw wing came apart. And if AW suggests pinning the anti-torque posts, why don't they drill them and include pins with the kit? It tells me there is a recognized design flaw.

I'll be the first to say it. You're wrong. They're metal. The pins were a later solution to guarantee that no one could possibly have a wing come off the tube (even if you didn't install the bolts with lock washers.) Rocco now uses both pins and bolts with lock washers on all of the models.

Scott

<ok, I get to be the second to say it...>