There is a lot of confusion going on here and it is likely because care is not being taken as to which variations are being talked about.

300M you are correct and what you considered for a fix is not only doable but neccessary. The Super Seniors as purchased from NitroPlanes have root ribs that are poorly aligned and has a very poor aluminum spar fitting. This spar insert or the built in wing boxs does not allow for any dihedral save for what can be had from looseness.

This flat wing actually appears to have anhedral due to an optical illusion. Now I am a big fan of true and substancial anhedral on a high wing cabin type however those advantages with a flat wing are not going to be there and in my opinion with this airplane will fly better for its intended purposes with a reasonable degree of positive dihedral.

Now without turning this into another argument over the pro and cons of dihedral The fix for this particular airplane is not difficult but does require a mediocum of effort

We now have I belive eight of the Super Seniors locally from Nitro Planes flying, two of which are mine and i use them specifically for primary instruction. For primary instruction I normally now only use my airplanes and only my radio equipment and no I am not a commercal operation.

All of these airplane exhibited this poor fit.

300m The fix is to take the aluminum joiner and scrib a line along only the bottom edge from the center to each end with roughly the dihedral you want. This angle is then ground into the joiner and it is carfully sanded and fitted to each wing. This will now allow the wing to be raised during joining to roughly the desired dihedral, the boxes are thourghly swathed in epoxy and joined.

The root ribs will be in the form of a v and as you noted in your early posts wood is just carved and inserted into the joint with epoxie.

Now the wing forward pin the one that inserts into the cabin bulhkhead will be to wide and its neccessary to trim the bulkhead a little.

There has been no failures in hard use except for a ninth airplane that the wing did fold on and the reason was that this fellow did not trim and use the aluminum joiner. Instead he replaced it with a piece of liteply (poplar) being only a bit less than a quarter inch Duh.

If you choose to fiberglas the center section then that is fine, I did not do that.

My ships are hard workers and the lastest use has also been introducing fellows into the joys of night flight via the A9 buddy box.

John

http://www.youtube.com/watch?v=J-ipvqIs8C8&NR=1