"tango4" wrote in message ...
Anyone got any ideas around when the switch was made from balscore to foam
sandwich on the Libelle wings?

Ian

According to the Tech Note Summary for the 201 Libelle series on
www.streifly.de, the balsa was replaced in the wing shells at serial
111 and on, in the ailerons at serial 113 and on, the rudder at serial
160 and on, and the elevator at serial 182 and on. Serial 182 and on
had the new horizontal tail and I think that is when it went from
straight GRP to sandwich construction. No core in the fuselage.

I think it always had balsa core shear web in the main spar.

Steve Leonard