REFLECTOR: ram air

[steve korney]

This little chart assumes std. day  :   sea level, 29.92, and 59 f.
It's what the front of the airplane is up against at different speeds...

In my Glasair, I see up to 2 inches of ram pressure on the manifold pressure 
gauge at sea level @ 220 kts. ias....  ie. 32 inches of manifold pressure on 
a std. day...

Best... Steve



----Original Message Follows----
From: Pat Shea <xl340hp at yahoo.com>
Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: ram air
Date: Fri, 7 Jul 2006 18:25:08 -0700 (PDT)

Steve,

Isn't effective ram pressure for a given speed
affected by the density of the air? Maybe this chart
assumes a sea level on a standard day...

Also, is this chart showing theoretical ram pressure
assuming no induction losses? Obviously that's not
happening w/ plumbing, air filter, etc.

The only way I see to determine your REAL RAM PRESSURE
is to check it in flight, not a chart. The question
is, what is a reliable reference. It seems that
installation differences in static and alternate
induction air systems makes both of these bad, err,
barometers...

Pat

Pat


--- steve korney <s_korney at hotmail.com> wrote:

 >
 > Here is a little graph that might help you figure
 > your own Ram Pressure...
 >
 > Best... Steve
 >
 >
 >
 > ----Original Message Follows----
 > From: Pat Shea <xl340hp at yahoo.com>
 > Reply-To: Velocity Aircraft Owners and Builders list
 > <reflector at tvbf.org>
 > To: Velocity Aircraft Owners and Builders list
 > <reflector at tvbf.org>
 > Subject: Re: REFLECTOR: ram air
 > Date: Fri, 7 Jul 2006 16:55:51 -0700 (PDT)
 >
 > Btw, what is the generally accepted method used to
 > determine the amount of ram you're getting?
 >
 > I've been comparing the ambient MP reading at the
 > airport (as indicated on my MP gauge with the engine
 > off) to my MP reading while doing a high speed low
 > pass at the same airport minutes later (WOT).
 >
 > It sounds like others compare the MP readings
 > between
 > their ram and alternate air sources.
 >
 > I wonder what the typical ram (loss) is on a high
 > performance spam can like a Mooney or Bonanza with
 > their filtered inductions.


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