Ok, so I am scratch building a gremlin and have glued the wings halves together and it seems that there is a considerable amount of flex in the wing. Now I have made a few mods to try and stiffen it up a bit. For one I have glued 1/8" fiberglass rods down the top and bottom of the wing close to the high parts of the chord. Two, I replaced the 1/8" ply would main spar with a 1/4" piece of lexon plexi glass. The top fiberglass spars are glued to the top of the plexi and the bottom spar runs full lenth of the wing. Now that it is dry if I put one wingtip on the ground and hold the other and try to flex it, I get a considerable bend and it seems to be bending only in the center of the wing where the cut out for the fuse is . It flexes both directions. Now I do not have a standard stock wing to check it with but can anyone tell me if this is common with the stock ones. I have not put the strapping tape on yet but with the fiberglass rods it should be about the same or better. I also do not think the the fiberglass tape will solve the problem if the center of the wing is flexing.

I know that in the air the upward forces on the wing will not be at the wing tips but rather spread along the whole wing, more in the center and tappering out towards the ends so maybe this may not be a problem. I am just conserned about a high G loop or the wings fluttering in a high speed dive. I have not done many foam wings in the past but my wiffle ball bat combat with a 6 foot wing does not seem to have as much flex as this 4 foot wing and it has the same fiberglass spars top and bottom but without the cutout in the middle.

Any suggestions or comments welcome.
Thanks.
John