Aeroworks Yak QB Series problem.

[Mark Dennis]

To everyone involved in this issue: I want to assure you that this is not a common issue with the 50cc Yaks or any of our Airplanes for that matter.

I do have some questions however:

1) Did you install the cotterpins provided in the kit?

2) How could you expect this plane to handle HIGH SPEED "Red Bull Air Race" type turns?

3) Why did you change out the supplyed tube? The stock tubes are anodized black and yours is clearly not.

I am sorry it took so long for them to get back with you, Rocco and Kim have been in Toledo all week so I'm sure thats what has caused the delay.

[1bwana1]

Sonito,
Sorry for your loss, I lost my first gas plane (not an Aeroworks) to a wing failure, so I really understand how you feel. I have an AW 260, so I am very interested in learning as much as possible to avoid problems. I think that the wing tube question really needs to be answered before looking for other causes. I hope you will do the right thing and let us know if you used a non-stock tube.

[mavacpjm71]

	Quote: Originally Posted by 1bwana1
	Sonito, Sorry for your loss, I lost my first gas plane (not an Aeroworks) to a wing failure, so I really understand how you feel. I have an AW 260, so I am very interested in learning as much as possible to avoid problems. I think that the wing tube question really needs to be answered before looking for other causes. I hope you will do the right thing and let us know if you used a non-stock tube.

I am no Aeroworks rep here, but having owned 3 of them in 10 years i can tell you that i have done extensive wring out on all of mine, if properly built and maintained then i see no reason why you should be encountering such an issue, sounds like flutter to me. Sorry for your loss, but i also think it is fair to understand whether you used an aftermarket tube rather then the one supplied, if this is the case then you should look within yourself as to the validity of this posting....

Personally i think Aeroworks Aircraft are some of the best ever created...and i think Roccos response was appropriate....my 2 cents..not trying to start issues here, but it seems a slight un-fair to point out Aeroworks aircraft and crap and not up to par....after over a decade and many many customers its simply not a true statement....

[mavacpjm71]

	Quote: Originally Posted by sonito
	No there was no flutter I was doing an 8 point roll straight and level and on the 5th point we all just gasped as the wing ripped out I had just done some Red Bull racing type high speed fly bys and no flutter whatso ever and I had HD linkages, this plane was just poor workmanship and the lame excse from Aeroworks just made it worse. The Hobico CS 150 digital servo is a good servo I use them on my 40%er and for a year now and no problems this is just bad PR for a company that has spent alot on Advertisement for the QB series and they Aeroworks didnt even have the courtesy to tell me from the get go that they were not resposible for poor workmanship and to jerk me around for a week was unfortunate but still it was done I told them I dont live off this sport and I just let them know that the ball was in their court and see what happened later like I mentioned before I would have rather them tell me "too bad so sad" and drive on these planes will fall apart we have other Yaks QQ and they dont fall apart and are rung out hard this one explodes on an straight and level manuever go figure. There was no flutter at all. BTW it was the first day out with the plane. I have vented

Ok help me out here, you posted earlier that you were doing a snap and it blew off, now in this response you say 8 point role....which is it ? snap or 8 point role....confusing...

[Vic3D]

I gotta agree with mavac... same here. Plus, hobbico servos? plastic arms?

[luv2flyguy]

	Quote:
	I am no Aeroworks rep here, but having owned 3 of them in 10 years i can tell you that i have done extensive wring out on all of mine, if properly built and maintained then i see no reason why you should be encountering such an issue, sounds like flutter to me. Sorry for your loss, but i also think it is fair to understand whether you used an aftermarket tube rather then the one supplied, if this is the case then you should look within yourself as to the validity of this posting.... Personally i think Aeroworks Aircraft are some of the best ever created...and i think Roccos response was appropriate....my 2 cents..not trying to start issues here, but it seems a slight un-fair to point out Aeroworks aircraft and crap and not up to par....after over a decade and many many customers its simply not a true statement.

I agree!!

[mavacpjm71]

	Quote: Originally Posted by Vic3D
	I gotta agree with mavac... same here. Plus, hobbico servos? plastic arms?

Yes, these are for 1.20 size aircraft not 50cc ...and plastic arms on hobbico....

[zzw26n]

	Quote: Originally Posted by mavacpjm71
	I am no Aeroworks rep here, but having owned 3 of them in 10 years i can tell you that i have done extensive wring out on all of mine, if properly built and maintained then i see no reason why you should be encountering such an issue, sounds like flutter to me. Sorry for your loss, but i also think it is fair to understand whether you used an aftermarket tube rather then the one supplied, if this is the case then you should look within yourself as to the validity of this posting.... Personally i think Aeroworks Aircraft are some of the best ever created...and i think Roccos response was appropriate....my 2 cents..not trying to start issues here, but it seems a slight un-fair to point out Aeroworks aircraft and crap and not up to par....after over a decade and many many customers its simply not a true statement....

This sums up my thoughts ....... proud owner of a AeroWorks 75cc Exta 260.

[ferocious frankie]

Sorry for loss! I had the gear rip out of my 1.20 AW Yak and I felt like crap so I imagine how you feel. However, the plane is beautiful and is very good quality. In fact, I think AW is one of the best ARF manufacturers in the market now.

However, I don't understand what you wanted from AW after the crash. Free plane? I know you're pissed, but if you know something we don't know like not using hairpins or pulling outrageous maneuvers then that's up to you.

Again, sorry for your crash and I hope you get what you want in the end.

[robertp17]

	Quote: Originally Posted by Mark Dennis
	To everyone involved in this issue: I want to assure you that this is not a common issue with the 50cc Yaks or any of our Airplanes for that matter. I do have some questions however: 1) Did you install the cotterpins provided in the kit? 2) How could you expect this plane to handle HIGH SPEED "Red Bull Air Race" type turns? 3) Why did you change out the supplyed tube? The stock tubes are anodized black and yours is clearly not. I am sorry it took so long for them to get back with you, Rocco and Kim have been in Toledo all week so I'm sure thats what has caused the delay.

I gotta tell ya, that wing tube does look suspect!! It looks too short. Look at the fiber one for the wing in the guys hand. The aluminum wing tube thats sticking out of the fuse side looks to short. Am i wrong here or is it normal for the wingtube to not fully extend to the end of the fiber one in the wing. Just to add my thoughts, Im flying a new 50cc 260 aeroworks QB and love it. It is by far the best looking and flying plane I have owned. Im using it for imac this year and it can handle whatever I throw at it.

[robertp17]

Not to keep rubbing salt in the wound but you can clearly see that the anti-rotation pins were not drilled. At least the one that can be seen in the photo.

[66stang]

I agree wingtube looks way too short.

[Mithrandir]

The structural concept with this type wing is for the tube to engage a plywood root rib and a plywood rib near its end. The lift loads are reacted thru the ribs into the tube... in other words.. the lift acts over the whole cord.. and that is reacted over the cord length thru the ribs and transferred to the tube... if the Alu tube does no engage the outboard rib, it then bears on the fiberglass tube.. and usually the fiberglass tube is butter.. and the alu tube will break out.
A shorter then stock tube would be free to shift back and forth as I mentioned earlier.... and that is consistent with the 2 inches of polished aluminum marks on the tube.
I also am curious about the tear in the tube about 3 inches from the end... is that tear on the outboard end of the tube.. if so.. looks like it might have been sheared by the end of the alu tube???

[sukhoi26mx]

...so I guess the point is that the rant at the beginning of this thread was not only totally misplaced, but also absolutely over the top crap (my opinion, of course). By all accounts, AeroWorks owes the original poster nothing - in fact I'd say the original poster owes AeroWorks an apology. Glad we got that figured out. What a bunch of baloney.

BTW, yes, I fly 5 AeroWorks models (more soon, I hope) including a 150cc Extra, 75cc Yak, 75cc Extra, 50cc Extra, and an electric Sukhoi. No failures to date and I absolutely thrash my models.

Scott

[maddmann]

Not taking sides on this but I have the AW 50cc Yak and mine came with an addendum that stated how to drill the anti-rotation pins and how to re-tap the wing blind nut. Mine came with the clips for the anti-rotation pins. Mine even showed and had the supplied wood to reinforce the landing gear mount. I did all that was stated in the addendum. Yes, the wing tube is black and the wing has only one steel wing bolt per wing. If I remember the wing bolt is 4mm but the addendum says to re-tap to 8-32. I bought longer wing bolts for mine as the original wing bolts were slightly undersized. I didn't feel comfortable tapping 4mm threads to 8-32. Mine replacement bolts fit tight enough. I did see where Tower lists the CS150 servos around 193 oz-in @ 6v and 162 oz-in at 4.8v. My manual says 130 oz-in minimum. I can't see where the servos aren't adequate enough. I wonder about the plastic servo arms. I wouldn't use those arms on a 50cc plane. It's aluminum arms on all surface servos. I have seen flutter without any sound at all. the only sign was wood damage (luck, I know)
It would be nice to know the length of the tube in the picture. Is it the same length as the original? How much flex in the plastic arms? Is there ball links attached to the plastic arms? You might get by with the heavy duty Dubro plastic arms but even this is questionable. I do see in the manual that heavy duty plastic arms are shown. Maybe this should be changed.
I think there was something other than a defect from AW.
I don't have alot of hard flying on mine but it's still rock solid and everything still fits tight.
Like I said I'm not taking sides, just stating what I see.
Oh yeah, sorry about your loss. It makes me nervous every time I take my 50cc planes out for a day of flying.