Bob;

I have a ram air scoop above the strake on my Velocity, and no filter, just
a SS screen.  I plan to eventually put in a trapdoor on the bottom of the
air duct in the cowl.  Not likely that the intake could ever get clogged,
but having the trapdoor open by low pressure (alternate air source) in the
duct may give me an inch or more HG MAP at static runup because the scoop
inlet is a bit restrictive until the plane gets up to speed.  I noted on
first flight the MAP was about 1" higher on climb than I have ever seen on
static for the same rpm.

Al

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bob White
Sent: Thursday, August 17, 2006 5:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Alternate Air

I would like to pose a question or two.  The checklist from the DAR had
alternate air as one of the items he looks for.  I asked the A&P that
will be doing my yearly inspection about it, and he thinks it's
important and should be there.  Initially I will be flying day VFR, and
may want to extend that to night VFR some day.

I wasn't planning on installing alternate air.  I have a direct ram air
intake to the throttle body with a cone filter attached to the throttle
body.  I can (just barely) put alternate air in but it will be a bit of
a pain.

So the question is, do most of you have an alternate air source in
your intake system? Did the FAA inspector or DAR specifically look for
it?

Thanks in advance for any input.  I have to decide if I'm going to just
do it, or argue. :)

Bob W.

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