Seen on a King Air with two Oreneda V8 engines.
The hole is big enough for a small child to crawl
inside. The duct just stops at the back. Stones and
other FOD could damage the hoses and other parts
at the rear of the duct. This type of duct (if you
can call it that) relies entirely on external
diffusion. There are four radiators on three sides
of the duct. Air exits by means of the louvers shown
in the upper picture. The lip of the duct is formed
by a bent up and welded stainless steel pipe to
act as a duct de-icer.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org