Hi, Is there a "rule" for grain orientation when the length of the spruce (say 16' longeron) and the height and width of the piece are square? As glued to the fuselge side, should the grain run paralled to the side of the fuselage or can it be--relatively speaking-- perpendicular (obviously depending on the grain's slope)? Is their a strength difference between orientations? How about for vertical members that connect bottom and top longerons? Also, if plans call for a 16:1 scarf joint, does that mean that the scarf should be 16 X the thickness of the piece of wood? Example: 1/8" ply X 16 =index.html 2", so the overlap of the two pieces should reach back a full 2" from the edge of each piece? Is there a good resource for general information such as this? I know these are very basic questions, but I'm new to the game. Thanks. Ed