WillR writes:


[...]

Balsa may be light -- but it is stable and strong. Bass wood does deform with moisture -- at least on large parts -- as does white pine --
another relatively stable material in small pieces.

Very good stability and workability for "sheet goods" you get from
birch plywood, for model building you get from 3 plys and 0.8mm
thichness upward in small (sheet of paper) sizes very stable stuff.
--
Dr. Juergen Hannappel http://lisa2.physik.uni-bonn.de/~hannappe
Phone: +49 228 73 2447 FAX ... 7869
Physikalisches Institut der Uni Bonn Nussallee 12, D-53115 Bonn, Germany
CERN: Phone: +412276 76461 Fax: ..77930 Bat. 892-R-A13 CH-1211 Geneve 23