Where to buy 3/16" x 1/4" spruce?

[flybywire]

Anyone knows the above?

[joe yap]

If you can't find, you can substitude them with hybrid materials.

For example, get 1/4"x1/8" spruce and glue a strip of 1/4" x 1/16" basswood together to achieve 3/16" depth.

Or you can glue a strip of 1mm CF tow under the 1/4" x 1/8" spruce. You will need to alter the rib's spar cutout to accomodate though.

1/4" x 1/8" spruce strips are available in NTC and some other shops. 1/16"x24" basswood sheets are available in Art friends. Jetthobby might have it as well. 6mm CF strips of different thickness can be found in most hobby shops.

[flybywire]

Hybrid, that is what I am trying to avoid

[flybywire]

Art friend price is cut throat

[joe yap]

But if you just buy what you need, it can still be cheaper than buying a full kit.

Anyway, if all else fail, and if the structure can accomodate 1/4" x 1/4" spruce and its weight penalty, you'll have another option.

Another suggestion. If it is for the spars, you can use 1/4" x 1/8" spruce fullspan, and glue another strip of 1/4" x 1/8" spruce from the wing centre joint to about 3/4 way of the wing span. This kind of spar design is far more effective than just a constant cross-section throughout the wing span. The latter is very common due to its simplicity, but it usually turns out that the outboard section of the wings are over-engineered.

Don't narrow down your choices too much. You may end up not building your favourite plane at all, just because of some unavailable materials. Use a lot of your imaginations.