Now know more about the 3 kinds of balsa grain

A-Grain also known as a Tangent cut
A-Grain has long fibres that show up as long grain lines against a smooth creamy background and is very flexible across the width of the sheet, it warps easily and readily bends around curves, but lacks stiffness. Use for sheet covering tightly rounded fuselages and curves and fabricated wing leading edges (D-boxing), forming tubes, strong yet flexible spars that can withstand 'hard landings', hand launched glider fuselages.
Don't use for unsupported sheet balsa wing or tail surfaces, ribs, or formers. To make A grain balsa wood more pliable and easier to bend without breaking, soak it overnight in a bucket of water with a small amount of ammonia (or bleach) added. It should be bent or shaped while wet, and then clamped in the correct shape over a former until it is completely dry.
B-Grain also known as Random or Mixed grain cut
Grain lines are shorter than type A, and it feels noticeably stiffer across the sheet. These B grain sheets vary a great deal in properties, often a single sheet will vary from A to C grain across it's width. This cut of balsa wood is useful for general purposes... Use for flat uncomplicated fuselage sides, trailing edges, wing ribs, formers, planking of soft gradual curves, wing leading edge sheeting (select the softest portion of sheet for the axtmdjbfzx tightest curvature). Generally, try to avoid buying sheets that change grain type dramatically across the surface (which can cause warping). If A or C grain is not available, you can sometimes find a portion of a B grain sheet that will make the part concerned. Occasionally, a variable grain structure may suit a particular part that requires different characteristics in different areas, but such occasions are rare.
Don't use if type A grain or type C grain will do a significantly better job.
C-Grain also known as a Quarter grain or Quarter sawn
This grain type has shorter, more mottled grain and is the most pleasant in appearance, sometimes looking like fish scales (occasionally the fish scales are of 'shot silk' iridescent appearance). It is very stiff across the sheet, is brittle and splits easily (sometimes too easily) longitudinally. This is the most warp resistant type, but it is difficult to sand effectively. Use for sheet balsa flying surfaces, fins, flat fuselage sides, wing ribs, formers, trailing edges.
Don't use for curved planking, rounded fuselages, rounded tubes, hand launched glider fuselages, or wing spars.If you want to know more information about balsa wood, go to our website here : http://www.balsafactory.com/.