Posted for "Gary Edwards" <gary21sn@hotmail.com>:
Jeffrey,

You did not mention which Lancair you are building.  I mounted the Whelen Power Supply on the floor, (on hard points) between the rear main spar and the flap crossover weldmount, to the right of the aircraft centerline, behind the co-pilot seat.  There is weldmount clearance with full up/down travel of the flaps (obviously).  Its location is out of the way and in an area of little use.  The comm. antenna coax passes a few inches nearby with no ill effects to the radio.

Gary Edwards
LNC2 235/