Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 27 May 2003 01:14:21 -0400 Message-ID: X-Original-Return-Path: Received: from [65.54.168.113] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2361892 for flyrotary@lancaironline.net; Sat, 24 May 2003 12:43:42 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 24 May 2003 09:43:41 -0700 Received: from 67.243.12.241 by bay3-dav9.bay3.hotmail.com with DAV; Sat, 24 May 2003 16:43:41 +0000 X-Originating-IP: [67.243.12.241] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EM2 sensors? X-Original-Date: Sat, 24 May 2003 11:17:21 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004F_01C321E6.0B903260" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Original-Message-ID: X-OriginalArrivalTime: 24 May 2003 16:43:41.0578 (UTC) FILETIME=[A2190EA0:01C32213] This is a multi-part message in MIME format. ------=_NextPart_000_004F_01C321E6.0B903260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I included the quote below because it was good advice and worth = repeating. Here is the rest of the story on sensors as it applies to = the EM2. The EM2 will include a basic set of sensors with the instrument. = I'll update the website soon on which ones are included and which are = optional. The RTD Temperature and pressure sensors used with the EM2 = are VDO sensors which are as close to a standard as one can get and are = widely available at reasonable prices. They are available in NPT and = metric threads so they can be installed directly into most applications = without adapters. =20 There are also 8 other temperature sensor inputs. 4 J type = thermocouple, usually used for cylinder head temps (CHT) and 4 K type = thermocouple used for EGTs. Obviously rotary flyers will not need all = of these but the EM2 will be available in a Lycoming version as well. =20 Air data sensors (TAS, Altitude, VSI, & OAT) are included with the = EM2. Fuel gauge sensors are Stewart Warner as used in Van's Aircraft (not = included) If you already have other type sensors, all is not lost. An = additional feature on the EM2 is a calibration screen. This is = primarily to calibrate the EM2 for greater accuracy than can be done = with fixed calibration (sensor do vary a bit) but it can also be used to = calibrate for other sensors if they are of the same type (RTD, linear = voltage, etc). I would still recommend using the VDO sensors that the = EM2 was designed with. If you are using an EC2 engine controller you do not need a fuel flow = sensor since the EM2 gets fuel flow infomation from the engine = controller. Lycoming drivers and carbureted rotaries will have to buy = an optional Flo Scan sensor.=20 The picture of the EM2 on the website is already obsolete due to = improvements in display layout. Some data is now provided in bargraph = form in addition to digital. In some cases, analog more pilot friendly. There is lots more I could go into but if I don't get back to working = on programming, the EM2 won't be ready for its June introduction. = Several builders ask "June what?" Don't know yet but I'll be happy if = it is June 30th. Dancing as fast as I can, Tracy tcrook@rotaryaviation.com www.rotaryaviation.com Rusty asked: " Are these stock temp sensors compatible with most gauges, = specifically the EM-2 (Tracy?) ? If not, how hard is it to find the = correct sensors that will screw into these metric holes (in the US)? = Does anyone know what the thread size of these holes is? " =20 Tommy James answered: Based on tough experience, choose the Gauge first. It will = determine what kind of sensor it is happy with. Not all sensors will = work for any one gauge. The Grand Rapids EIS uses some sensors that = require a resistor wired in to give the proper reading, also 'exciter' = power is needed to some. Tracy's system will doubtless require specific = sensors just like the other makers. Wait and see what is needed then = buy the sensor. JC Whitney sells a little package of metric to NPT adapters that you = will need to fit the NPT sensors to the metric block. These are cheap, = so buy 2-3 packs. As I remember off the top of my head, they are 10mm = fine (?) pitch male to 1/8" NPT female. ------=_NextPart_000_004F_01C321E6.0B903260 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 

I included the quote below because it was = good advice=20 and worth repeating.   Here is the rest of the story on = sensors as=20 it applies to the EM2.

 

The EM2 will include a basic set of sensors = with the=20 instrument.   I'll update the website soon on which ones are = included and which are optional.  The RTD Temperature and = pressure=20 sensors used with the EM2 are VDO sensors which are as close to a = standard as=20 one can get and are widely available at reasonable prices.  They = are=20 available in NPT and metric threads so they can be installed directly = into=20 most applications without adapters. 

 

There are also 8 other temperature sensor=20 inputs.  4 J type thermocouple, usually used for cylinder head = temps=20 (CHT) and 4 K type thermocouple used for EGTs.  Obviously rotary = flyers=20 will not need all of these but the EM2 will be available in a Lycoming = version=20 as well. 

 

Air data sensors (TAS, Altitude, VSI, & = OAT) are=20 included with the EM2.

 

Fuel gauge sensors are Stewart Warner as = used in=20 Van's Aircraft (not included)

 

If you already have other type sensors, all = is not=20 lost.  An additional feature on the EM2 is a calibration = screen. =20 This is primarily to calibrate the EM2 for greater accuracy than can = be done=20 with fixed calibration (sensor do vary a bit) but it can also be used = to=20 calibrate for other sensors if they are of the same type (RTD, linear = voltage,=20 etc).   I would still recommend using the VDO sensors that = the EM2=20 was designed with.

 

If you are using an EC2 engine controller = you do not=20 need a fuel flow sensor since the EM2 gets fuel flow = infomation from the=20 engine controller.  Lycoming drivers and carbureted rotaries will = have to=20 buy an optional Flo Scan sensor. 

 

The picture of the EM2 on the website is = already=20 obsolete due to improvements in display layout.  Some data is now = provided in bargraph form in addition to digital.  In some cases, = analog=20 more pilot friendly.

 

There is lots more I could go into but if I = don't get=20 back to working on programming, the EM2 won't be ready for its June=20 introduction.  Several builders ask "June what?"  Don't know = yet but=20 I'll be happy if it is June 30th.

 

Dancing as fast as I can,

 

Tracy
tcrook@rotaryaviation.comwww.rotaryaviation.com<= /SPAN>

 

Rusty asked:

 " Are these stock = temp sensors=20 compatible with most gauges, specifically the EM-2 = (Tracy?) = ?=20   If not, how hard is it to find the correct sensors that = will=20 screw into these metric holes (in the US)? =20  Does anyone know what the thread size of these holes is? "  =

 

Tommy James answered:

 

Based on tough experience, choose the = Gauge=20 first.  It will determine what kind of sensor it is happy = with. =20 Not all sensors will work for any one gauge.  The Grand Rapids = EIS uses=20 some sensors that require a resistor wired in to give the proper=20 reading,  also 'exciter' power is needed to some.  Tracy's = system=20 will doubtless require specific sensors just like the other = makers. =20 Wait and see what is needed then buy the sensor.

 

JC Whitney sells a little package of = metric to NPT=20 adapters that you will need to fit the NPT sensors to the metric=20 block.  These are cheap, so buy 2-3 packs.    As = I=20 remember off the top of my head, they are 10mm fine (?) pitch male = to 1/8"=20 NPT female.

 

 

 

 

 

 

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