Posted for "Lancair" <lancair@USTEK.COM>:

 Pardon the ignorance, but why are these diodes required?
 
 Robert M. Simon
 ES-P N301ES
 
 

 
 > Thanks for supplying the Columbia wiring diagram; very interesting.
 > Schottky diodes are definitely the way to go.  Something like a MBRB4030