>>"Has anyone tried Aspen wood in their aircraft?" Patrick, There are several places that list wood properties, here is one: http://www.woodbin.com/ref/wood/strength_table.htm . Specific gravity and crushing strength parallel to the grain are the first properties to consider, but they all are important. Larry Harrison built his Pietenpol AirCamper from Yellow Poplar. I am not sure if Yellow Poplar is Big Tooth or Quaking Aspen. The USDA Forest Products Laboratory in Madison, WI is very helpful if you have any questions concerning wood properties. Dick Hartwig Waunakee, WI rhartwi...@juno.com