X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from bay0-omc3-s32.bay0.hotmail.com ([65.54.246.232] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2089889 for flyrotary@lancaironline.net; Thu, 07 Jun 2007 16:21:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.232; envelope-from=lors01@msn.com Received: from hotmail.com ([65.54.250.89]) by bay0-omc3-s32.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Thu, 7 Jun 2007 13:20:26 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 7 Jun 2007 13:20:25 -0700 Message-ID: Received: from 4.171.174.200 by BAY115-DAV17.phx.gbl with DAV; Thu, 07 Jun 2007 20:20:23 +0000 X-Originating-IP: [4.171.174.200] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: TAS calibration Date: Thu, 7 Jun 2007 15:24:07 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C7A917.E40A9830" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0034.2000 Seal-Send-Time: Thu, 7 Jun 2007 15:24:07 -0400 X-OriginalArrivalTime: 07 Jun 2007 20:20:25.0856 (UTC) FILETIME=[488DA800:01C7A941] Return-Path: lors01@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C7A917.E40A9830 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bob is correct, the sensor offset is the parameter that needs adjusting. = I usually set this to one less than the sensor reading at zero = airspeed but setting them equal is OK as well. As always, When all = else fails, read the instructions. Tracy > > >=20 > > > Bulent Aliev wrote: > > > > Here is another question for the electronics gurus. > > > > I noticed on the EM2 TAS is always 15-18 K while the plane is = still? I=20 > > > > thought it is supposed to be zero? If so, I could not see a = way to=20 > > > > adjust it? > > > > Buly > > > > > > > That number happens to be somewhat close to the value of the=20 > > > acceleration that a prop introduces to the air. Where is your = pitot=20 > > > located? That may be what the sensors are actually seeing. > > > > >=20 > > My pitot is in the nose (CZ MK-IV) and the prop at the back. Plane = sitting in the hangar. No air movement. > > Buly > >=20 > Hi Buly, >=20 > I'm pretty sure there is a calibration setting in the EM2. Mine = wasn't > zero either and I seem to recall adjusting it. I'll have to look = thru > my notes to see if I can find it. >=20 > Bob W. >=20 Air speed is channel 14 in the calibration menu (Hold 3, press 1). = When you first select the channel, take a look at the current value of the sensor. Change the sensor offset to match that value. That will give a zero reading on the display. You may still need to adjust the scale factor, but will need some flying data to know. OAT and altitude need to be correct also.=20 Bob W. --=20 N93BD - Rotary Powered BD-4 - = http://www.bob-white.com 3.8 Hours Total Time and holding Cables for your rotary installation - = http://www.roblinphoto.com/shop/ -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_000E_01C7A917.E40A9830 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Bob is correct, the sensor offset is the parameter that needs=20 adjusting. I usually set this to one less than the sensor = reading at=20 zero airspeed but setting them equal is OK as well. As = always, When=20 all else fails, read the instructions.

Tracy

>=20 > >
> > > Bulent Aliev wrote:
> > > = > Here=20 is another question for the electronics gurus.
> > > > = I=20 noticed on the EM2 TAS is always 15-18 K while the plane is still? I =
>=20 > > > thought it is supposed to be zero? If so, I could not = see a way=20 to
> > > > adjust it?
> > > > = Buly
> >=20 > >
> > > That number happens to be somewhat close = to the=20 value of the
> > > acceleration that a prop introduces to = the=20 air. Where is your pitot
> > > located? That = may be=20 what the sensors are actually seeing.
> > >
> > =
>=20 > My pitot is in the nose (CZ MK-IV) and the prop at the back. = Plane=20 sitting in the hangar. No air movement.
> > Buly
> > =
> Hi Buly,
>
> I'm pretty sure there is a = calibration=20 setting in the EM2. Mine wasn't
> zero either and I seem to = recall=20 adjusting it. I'll have to look thru
> my notes to see if = I can=20 find it.
>
> Bob W.
>

Air speed is channel = 14 in=20 the calibration menu (Hold 3, press 1). When
you first select = the=20 channel, take a look at the current value of the
sensor. = Change the=20 sensor offset to match that value. That will give
a zero = reading on=20 the display. You may still need to adjust the scale
factor, = but will=20 need some flying data to know. OAT and altitude need
to be = correct=20 also.

Bob W.

--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 = Hours=20 Total Time and holding
Cables for your rotary installation - http://www.roblinphoto.com/shop= /

--
Homepage: =20 http://www.flyrotary.com/
Archi= ve and=20 UnSub: http:= //mail.lancaironline.net:81/lists/flyrotary/List.html

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