Hi All

I have 2 questions that people have alluded to on the list but I have
not seen them addressed directly.  

1) Do rotary aircraft engines need air filters?  I have seen pictures of
engines with air filters but man pictures comments on the list,
particularly from Jerry have led me to believe that not every one uses
air filters. No air filters would greatly simplify design of CF p-port
(eliminate plenum) and other manifolds.

2) Do most planes have scoop intakes for pressure recovery from air
going intake manifold?  It seem to me a lot of the intakes terminate
after the throttle. While this would make construction easer it is a
loss of some potential HP.

Alex Madsen