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Reply-To: "David Carter" <dcarter@datarecall.net>
From: "David Carter" <dcarter@datarecall.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-854020@logan.com>
Subject: Re: [FlyRotary] Re: A lot to learn
Date: Mon, 4 Apr 2005 09:24:50 -0500
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----- Original Message ----- 
From: <jbker@juno.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 04, 2005 7:07 AM
Subject: [FlyRotary] Re: A lot to learn ! Re: Cooling -Learned a lot


>
> Charlie E wrote:
>
> At the risk of embarrassing myself with a display of misunderstanding
> the physics of it all, should your pressure sensors be measuring dynamic
> pressure or static? Seems like I remember Tracy's measurement pics
> having foam chunks over the pressure sensors to remove the dynamic
> component of the pressure measurement. I couldn't remember if your setup
> has that (& I really don't know if it should, either).
>
> Charlie
> ---------------------------------------------
> I am trying to establish how much air is going through the radiator by
measuring the dynamic pitot (total) pressure minus the static in the very
good looking bellmouth at the inlet. I am also trying to measure the air
temp in and out and the water temp in and out. With this we can see if it
all makes an energy balance. Also want to measure the total in front and
behind the radiator to see how much loss, i.e drag the radiator is
contributing.
>
> Currently most of this effort is on the back seat because I can live with
the current cooling, but have to isolate the noise, vibration source that is
exciting the cockpit level.
>
> Bernie

Bernie,
   Maybe there are two things to be measured for a full evaluation of
"pressures" and "recoveries" in the duct or by the duct:
    1)  What you stated above, and
    2)  How much does STATIC pressure increase between small opening of duct
and aft/wider end of duct at front face of radiator?
. . . . . -  A new "static pressure" sensor by your "pitot/dynamic pressure
sensor" at front would give that info.

David