Hi,

I had an Ultrastick 40 ARF from Hangar 9 with an OS 46 FX. I was doing rolls and loops with only 30 % throw (quad flaps design) and my wing snapped in half. Has this happened to anyone else? I will get pictures of the wing roots to show, but about 2/3 of the area was covered by glue but it still snapped. My hoobyshop isn't sure if he will be able to replace the plane for me.

Any suggestions or help is appreciated.

Ales,

I've had no problems with my UStick. Did you use epoxy on the center joint?

Did you throttle down on the down lines of the loops? Did you use plenty of glue on the joint? That's a pretty strong wing, I've flown the crap out of mine and no wing prob's what-so-ever.

Same here. Had mine for 3 years and have flown it very hard with no issues.

Yeah , used epoxy on the joint. But it didn't hold.
Ales

Sorry about your loss Ales,
I'm flying my ustick 60 and was also told by my instructor to throttle down on the downlines
in order to not stress the airframe more than necessary.
a little glassing on the underside of the wing also adds some more strength against
the mostly positive g-forces.
I crushed my wing in the middle when i tried to push the servo in and the wingtips when i closed the rooftop
of my miata. guess it didn't fit right but after removing the covering i found out that they used some kind of
hotglue or else and not applied consistantly to all surfaces. Who knows how much glue is in there anyways.
I'd give hangar 9 a call and see if they give you options.
good luck, pat

I would make sure that you use plenty of glue next time. Put the glue on both halves, all surfaces. It should be dripping out of the wing joint after you push it together. Then just wipe up the excess with paper towels and alcohol. It should be SLOPPY with epoxy.

There is also a device they sell that will put little tiny holes in the balsa surfaces so the epoxy sinks into the wood. Some people sand it to get the shiney surface off the wood too.

Then of course you can glass it.

What kind of epoxy did you use?

Joe

P.S. I've read a lot of the threads on this ARF and the wings collapsing is not an issue. But there is always the possibility of a bad wing.

Thanks for the support guys.

I used Z-Poxy 30 minutes,

Also thanks for the how-to (dripping out ) for the epoxy. I will only find out next week what the conclusion of Hangar 9 is.

In the meantime I'll finish setting up a used GP Ultimate biplane 40 that I purchased, I have a new OS 50 ringed SX to put into it.

Any suggestions or comments would be great.

The previous owner built it upside down so the firewall has left thrust instead of right thrust. He glued some ply spacers to correct the situation directly under the engine mount.

Ales,

Never had a problem with my Ultra Stick 40's wing, and it's been flown HARD

Never heard of this happening either.....I hope you have good luck with Hangar 9's service.....I've heard they are very good about things like this.

Glassing the center joint isn't a bad idea, although it shouldn't be necessary. I have never throttled mine down a bit during dives or on the back side of loops. My Ustick has taken everything I could throw at it.