Hi Adam,

You might want to speak with Bob Fair.  He completely changed the way he did
the defrost, and does not use the inside of the canopy stiffener as a plenum.
 Thus, no defroster holes in the stiffener.  Instead, he brings the heat in
through a plenum just underneath the stiffener.  Since heat rises, the effect
should be the same.  The benefit is there are no moving parts, no scat
tubing, nothing to interface between the fuselage and the canopy.  The system
is completely stationary below the canopy.  This system is being developed by
Lancair and should be available to Legacy customers in the future.  I don't
know if it is available now, however.   It is really simple enough for the
average builder to fabricate for themselves.

John Kleber
N83JK   LEG2/G