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S2G ASW 27

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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:  :D   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:

--- Quote from: "Fred" --- The boss left with the money  :wink: , but that has been re-opened since  :wink:  :D   The defect never was admited by S2G...
--- End quote ---
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  :D

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