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From: "Bill Bradburry" <bbradburry@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: MAP drop
Date: Thu, 21 Jun 2012 12:47:13 -0400
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I don't think I get much pressure drop across the filter, but I don't know
what the rest of the intake does.  I would like to get a pressure reading at
the entrance to the rotor to see what the drop is for the entire intake
manifold and filter.

It seems like an AFR of 16 is lean for turbocharging during a takeoff run??

I don't guess I understand why you want your manifold pressure to read in
"percentage of ambient"??  Why not just inches??

Bill B
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Thursday, June 21, 2012 11:45 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: MAP drop

Bill Bradburry wrote:
> Ernest,
> 
> My filter gets pressure from the air entering the nostril.  I get about
0.5
> inch manifold pressure above baro on takeoff.  No drop that I can see.
> 
> Bill B
> 


This was the piece of info I was looking for.

I did a WOT speed run this morning, with the engine was bouncing between
4900 and 5100 RPM and the MAP wavering between
97.5 and 98.1 kPa.  The computer normalizes the MAP to 100kPa when you turn
it on, so you can think of the reading as a
percentage of ambient air pressure.  I'm only getting her up to about 30mph.
I didn't have the GPS running, and forgot
that I have an airspeed indicator.  I just looked to keep the speed down.
There isn't much ram pressure at 30mph, but I
was hoping that my blower would do better than what it seems to be doing.
My goal is to get a reading above ambient.

I'm starting to get the engine to run smooth now, though.  After the run, I
sat there letting it idle.  The AFR coming
in at around 16, and the idle down to around 1400, you could have sat your
coffee on the panel and not even worried
about all those expensive electronics beneath it.  Smooth as butter.

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