Can I use different material for stringers?

[alexM]

Are you talking about the wings or the fuselage? The wing ribs are different. The newer style ribs have round holes for the 3/8" tube (0.028" wall if I recall) in place of the D shaped wooden moulding of yesteryear.
I'm guessing it's possible to create some plywood shapes to fill the gap. Be really careful about what that does to your false rib position though.

True story: I attempted to source that aluminum tube at my local Metal Supermarkets, just like I did for my fuselage stringers. I got a case of sticker shock when my quote came. It turned out ordering it from Kitfox and paying the trucking company was still way cheaper (dang near half if I recall) than my local will call.

[LuckyFox]

Stringers for the fuselage is what I need I believe the original was a hard wood.

[alexM]

Gotcha. I can't speak for the series 4 but the 5 had a wooden stringer on the belly and aluminum on the sides (and several cross pieces which have since been done away with).

Using the aluminum on the bottom required no changes. Those side stringers are 1/2" 6061 with 0.028" wall.

[LuckyFox]

Thank you!!