Originally Posted by aclmck
Balsa's main use is weight saving,after that it is glassed then it has a performance similar to solid layup,but interestingly it has a higher deflection and puncture resistance than steel 4mm or ally6mm (that's off ATL website)
its really nice to see that someone really does get it..
in this discussion between single
skin and cored composite, a lot of people seem quite ignorant of the huge advantages cored layups present. Yes they can be lighter, but also they can be a lot stronger on the same weight. The entire aero industry has followed this pursuit for opposite reasons, generally to reduce weight but maintain strength.
Separate a single
skin design model into two and insert a foam core to double the skin thickness, panel rigidity goes up by 7 times and strength by 3. The weight of the model is barely different from a single skin.
Use the same layup with a 4x thickness core, and the relative stiffness increases to 37 times, the strength to 9.2 times, but the weight only increases to 1.06 times.
Notably with composites one can vary the layups to include fibres, biaxial, triaxial, kevlar, carbon, etc which also greatly affect the engineering utility of the design.
I challenge anyone to put their hand up if they think that isnt an advantage.