S2G ASW 27

[doogie1]

Hi Everyone,
I have a ARF kit ASW27 by S2G 4.2m wing span glider which was stored in my garage for years.
I am planning to put it together.

I have read that there is a problem with the wing centre join but reading the emails I am not entirely sure what the problemis. ie is there no spar, or no ribs between the wing tube ends??

The newer models were suppose to have the problem fixed...but how do you know whethere you have one of these new wings?? Is there a way to tell what wing one has?? apart from crash due to wing failure.

From what I heard the company is nolonger in existence. I did contact them when they were still around but they said they would help me solve the problem but never offered any advice nor admit they had a problem with their wings.

I visited the french site but was more confused by what was discussed. It looked like a major modification...I might as well rebuild the wing.

Could anyone help ID whether I have a faulty wing.....and if so the minimal intervention I need to do to fix the problem. I don't really what to recover the wing and rebuild it. I am also pretty unfamiliar with how the S2G glider wings centres are constructed so I need a very clear explanation what to do.( I am very familar  with F3A pattern foam wing construction though..is it similar)
Thanks in advance to anyone who can help me. :roll:

Regards Doogie

[Fred]

Hi Doogie,

Welcome to the forum !

Well, that's an old problem, but fairly easy to fix !
Originaly, the problem was from the way they glued the wing joiner tube and spar in the wing. At high speed or high G maneuvers, a "delamination" (?) appeared sometimes.
Not all the S2G kits were affected by this problem, so, don't worry too much on that !
With all the S2G Aswxx I saw, none of them crashed because of a wing failure !

So, the best way to see if your wing have this problem, is to "open" the wing root a little, and see if you have the tube glued or not. If you don't want to open the root (not that easy..), drill holes under the wing and pour epoxy with a seringe inside. You may not need to do it, but as a precaution, that will give you peace of mind !

I have photos of the wings with defect somewhere... I'll try to find them tomorrow and post them here...

By the way, S2G is still around. The boss left with the money  :wink: , but that has been re-opened since  :wink:     The defect never was admited by S2G...

[Fred]

Found 1 photo in my archives...



Well, this is the result !

The failure come from the Wing Joiner tube not glued properly on some machines.
Seringe, epoxy and that will fix the problem !

[cvanscho]

The boss left with the money  :wink: , but that has been re-opened since  :wink:     The defect never was admited by S2G...

Which defect - having a lousy boss?

But seriously, Fred, what type of syringe would you recommend for epoxy, and where would you find such a thing?

Chris

[Fred]

Hi Chris,

Well, just use the medical ones, they are perfect.


Take one with the nozzle big enough for the epoxy to flow quiet easily (2 to 3mm diameter...  )
Drill holes where the spar is, on the lower surface of the syringe nozzle diameter.
Prepare your epoxy in at least a 20 degrees environment (epoxy will flow better with the heat)
Put the epoxy in the syringe, and apply on each holes.
Just make sure to have enough epoxy to do everything in 1 go.
Same thing can be done from the upper surface, but if the wing are already covered, need to patch them after that.

But once again, this issue is only for some of the old version of the S2G gliders. Might not been needed in this case, but we never know !
Pouring epoxy like this, will fix or secure the wing joiner very easily and neatly  

[Fred]

OOppss, forgot, I don't know in Irland where to find the syringe easily, but in France, you go to any pharmacy, and they have the all range to choose from.
Otherwise, Ebay etc etc...Very handy to have, even for the white glue etc etc

[joe]

If you can't find any. I have a bunch somewhere. I can send you a couple.
Dont ask!!!  :shock:  
Only joking use them for epoxy stuff.
J

[Fred]

O:)

 :mrgreen:

[Alan_Perse]

:lol:  :lol:  :lol:

[cvanscho]

Thanks, Joe, maybe with a small order?

[joe]

No order necessary Chris. They are freeeeeeeee!!!!!

 :wink:

[cvanscho]

Yeah, thanks, Joe, but the postage won't be, so I was thinking I need a few bits and bobs anyway... :wink:

[doogie1]

Thanks Fred,
But I need to clarify........ie where to inject the glue.

So are you saying that the spar was not glued down well to the wing tube???
Or the wing tube not well glued to the foam??
Or the spar is not glued well to the wing sheeting???

Did you drill holes into the foam around the wingtube or use a 21 0r 18 gauge needle on the syringe and simply inject in?

What about drilling down through the root along the sides of the wing tube and use a polyuerathane glue after injecting some water in.......makes it foam up and penetrate the foam and any into cracks.
 We use to do something similar with the gas large scale aerobatic planes after the wing tubes in the tail planes wore out due to the vibrations from the petrol motors.

PS no problems getting the syringes and needles....... as I am a Doogie Howser!
 Regards  :clap:

[cvanscho]

"Is there a Doctor in the house?"

[Fred]

Hi Doogie,

The wing tube was not glued, or poorly, to the foam.
You can drill holes, the size of the syringe noozle on the uper or lower surface, or both.
You can also, as you say, pour the epoxy from the wing root.





Instead of epoxy, you can also use expanding foam after you humidify the foam core...

But once again, drill 1 hole, pour the epoxy as a test. Not all the S2G kits, even the old ones, needed to be fixed. Your kit might not be in the lot !
But if at the first hole, you pour a lot of resin inside the hole (well, relatively  :wink: ) that's a bad sign ! And you can go ahead by drilling more holes to put more epoxy or foam.