X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([207.115.11.53] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3490525 for flyrotary@lancaironline.net; Thu, 12 Feb 2009 15:51:44 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.53; envelope-from=ceengland@bellsouth.net Received: from [0.0.0.0] (adsl-19-163-32.jan.bellsouth.net[68.19.163.32]) by isp.att.net (frfwmhc03) with ESMTP id <20090212205105H0300087hce>; Thu, 12 Feb 2009 20:51:06 +0000 X-Originating-IP: [68.19.163.32] Message-ID: <49948BBB.4080006@bellsouth.net> Date: Thu, 12 Feb 2009 14:51:07 -0600 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.19) Gecko/20081204 SeaMonkey/1.1.14 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: EM3 Shameless promotion References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit No way to just make it another software/display item? I was assuming (don'tcha love that word) that static pressure would drive the encoder output, & a separate software routine would calculate IAS from the pressure differential measurement & true ALT from static pressure & manually-entered baro setting, & the results would be available on an(other) air data page. (creep, creep, creep....) Charlie Tracy Crook wrote: > I could easily switch TAS to IAS but I plan to have the altitude drive > an output for transponder encoding. That pretty much limits it to > reading pressure altitude. I could have a baro adjustment if the > encoder is not used. I'll put this on "The List". > > It already has VSI but the response time is slow compared to the steam > gauge type. Good enough for backup I think and it is useful for > inclusion in the data logger data. > > Tracy > > On Wed, Feb 11, 2009 at 7:30 PM, Charlie England > > wrote: > > Now that the thread is reactivated, how about *indicated* > airspeed? I'm thinking basic flight instrument backup: AS, ALT > (with baro) & maybe vertical speed. > > Charlie > > Tracy Crook wrote: > > That came up in an earlier topic. I had decided to have a > second TAS readout option so you could put a static probe > (sponge covered tube, etc) in front / behind various heat > exchangers so you could see the relative pressure recovery. > I'll just use the same sensor as the main TAS pressure sensor. > You can convert the mph reading back into pressure if that was > needed. > > Tracy > > On Wed, Feb 11, 2009 at 5:45 PM, Monty Roberts > > >> > wrote: > > Tracy, > I was mostly thinking about air pressures. Like plenum, > after > radiator etc. I'm not sure what the best type of transducer > would > be, but my guess is the MAP sensors are the least expensive > way to > go. Most of the lab grade transducers with a pedigree are just > ridiculously overpriced. If they work with 0-5 that would > be perfect. > Unless you know of something better in which case, I'm > all ears. ;-) Monty > Hi Monty, > What kind of pressure are you thinking of? Air, liquid, > what > pressure range, etc? I could have some gen purpose 0 - 5 volt > inputs that can be calibrated to whatever units you wanted. > You > would have to use a sensor that put out voltage in this > range though. > > Tracy > > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.234 / Virus Database: 270.10.23/1949 - Release Date: 02/10/09 07:20:00 > >