I have read the old rules to which a link was given in the Helicopter - Future Aviation Events forum. I gather that the length and wingspan are both limited to 30 cm. Further, in the AMA website there was a reference to the wing chord being limited to 3 inches. Now I have two questions for the rule makers:
1. Are biplanes and triplanes allowed ?
2. Will Science Olympiad have a limit of 3 inches for the chord ?
The usual caveat, NOTHING HERE IS OFFICIAL, opinions (however educated or from whatever source) are only opinions. If you want clarifications to the official rules, submit them to the official site.
AMA rules have come up in the past since the flying events LOOK a lot like AMA competition. THEY AREN'T. The only rules for SO events are in the books or on the NSO website. However much we use our knowledge of AMA rules (that's where a lot of us came from, and is a way to enjoy this sport beyond our SO years) to develop SO rules, NO AMA practice or rule, however common, is binding on SO events.
Example, some long time AMA flyers got indignant about students managing rubber torque in Wright Stuff with something known as torque burners to significantly extend their flight time. Not allowed by the AMA rules they were used to. Well, it wasn't in the SO rules, so it WAS legal, in SO competition. In fact, it was the way to win if you were in a low ceiling site. Out of the box thinking is intentionally allowed/encouraged by SO rule writers.
Another example, AMA gliders do not allow folding wings. Nothing in the SO rules on that. Hmm, could that be intentional?
Biplanes/triplanes. Do the SO rules explicitly state monoplane? Rule out multiple wings? If not, the general rule is "If it aint forbidden (unless unsafe) its allowed."
Note again comment opinion vs official above.
<SNIP>Seems that even though the rules allow for mylar wings, just the balsa edges + ribs won't be enough to withstand the force of launch, unless they're really sturdily built... so far my attempts at solid balsa wings have been less than stellar :T oh well, I need new wood anyways.
Um, again opinion, but where in the rules does it say you need to use balsa for the spars? If you look around on the web, you'll find a 3.2 gm Penny Plane made with carbon fiber spars. It flew very well. I don't KNOW that will work for glider level forces, but Penny Planes have a larger span than these things, so...
OH, and keep in mind a glider that works well for a tall site MAY be very different than one that works at a low site. At least they are in AMA competiton. And while the rules don't apply, physics is physics. You'll learn a LOT from their experience.