This idea might have some merit- have a small SS tube, about 1/4" dia

welded

into the last 4 inches or so of the exhaust system, post muffler. The

tube

would go in and take a sharp downstream turn. This should draw some

vacuum.

How much, I don't know, but there are NO moving parts to break, and

the

weight would be very small.
Brian Trubee

Interesting,  How about a slight taper in diameter of the tail pipe,
creating a venturi,  installing a second light housing around the tail
pipe at that location, and plumb a small tube to a vacuum reservoir.
Drive your instruments from the reservoir.  I think this should be
experimented with.  I'll draw something up.   Tom Webber

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.