Bill,

Here are the weights (digital postal scale) of the 20 pieces of 3/32"X3"X48" contest grade I got from National Balsa. (I did get the less-clear stuff to save a few bucks.) I measured the plans and took a SWAG at how many of the 3" sheets I'd need. If I run short, I have some contest grade I've been hoarding for some years.

Weight.....Qty

0.6 oz.......3
0.7 oz.......4
0.8 oz.......9
0.9 oz.......3
1.0 oz.......1

Total 15.5 oz. and 2880 sq. inches (.00538 oz per sq in.)

The 8 sheets of the 3/32X6X48 supplied sheeting weigh a total of 1 lb, 1.6 oz and come to 2304 sq. inches (0.00763 oz per sq inch).

So there is a savings using the contest grade. At my altitude, the difference could be noticeable. At sea-level with the 1.20 AX, I'm not sure.

Hope this helps.

Cheers,
Richard