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Subject: RE: [FlyRotary] Re: For Ernest  Re: More on Header Tanks,  Venting & Pressure Reg Position
Date: Tue, 15 Feb 2005 16:04:06 -0800
Message-ID: <091A2D42FAF91A41B84750D269FC97E72B310E@canformail1.canfor.ca>
Thread-Topic: [FlyRotary] Re: For Ernest  Re: More on Header Tanks,  Venting & Pressure Reg Position
Thread-Index: AcUTuC5XfThjaJA+QeyRSc465TfMUAAAevRw
From: "Bartrim, Todd" <Steve.Bartrim@canfor.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Hi Ernest;
	Just to Echo what Marv has said here, your distance will have no
effect on the MAP signal to the regulator at all. As an Instrument
Mechanic we use either a 4-20mA or a 3-15psi signal to control
processes. In the older plants it was common to see the pneumatic
signals (3-15psi) routed hundreds of feet with no signal loss.

Todd Bartrim

  And third, I now see why the regulator is located so close to the
injectors.
  'Cause that is where the reference pressure is.  If is moved further
away you kill its response.
"""

I don't think that is correct.  You're not interested in moving any
volume of air through the MAP pressure hose to the MAP sensor, just
transmitting the pressure.  A very small ID hose is all that should be
required, and its distance from the source (within reason, of course)
should not have a lot of effect. =20