X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6095301 for flyrotary@lancaironline.net; Mon, 04 Mar 2013 18:32:10 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=2.0 cv=XNeyuHdE c=1 sm=0 a=g3L/TDsr+eNLfIieSKfGkw==:17 a=AHkS0RJitIMA:10 a=3d0zEozF5ncA:10 a=05ChyHeVI94A:10 a=ayC55rCoAAAA:8 a=oLwK44CY5hMA:10 a=arxwEM4EAAAA:8 a=r1ClD_H3AAAA:8 a=HHGDD-5mAAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=oCcaPWc0AAAA:8 a=l54I4PLXg3RVSK-_Rl0A:9 a=wPNLvfGTeEIA:10 a=Qa1je4BO31QA:10 a=i1zE5R4R5dEA:10 a=pGLkceISAAAA:8 a=McbOIuwdthE4BP2015wA:9 a=_W_S_7VecoQA:10 a=tXsnliwV7b4A:10 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 a=nA9r9NEFPyvFFgch:21 a=g3L/TDsr+eNLfIieSKfGkw==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 174.110.170.10 Received: from [174.110.170.10] ([174.110.170.10:57992] helo=EdPC) by cdptpa-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id BF/64-04559-6DE25315; Mon, 04 Mar 2013 23:31:35 +0000 Message-ID: <2B530664F33B47F1B1A544FD5BEC5459@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Fly by wire Date: Mon, 4 Mar 2013 18:31:29 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01CE1906.7CC22700" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_003C_01CE1906.7CC22700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Tracy, I'd like a set of the fly by wire data you are willing to share.=20 When the Diaz variable pitch prop was in play, I developed a controller = for the blades pitch motor which I later modified to respond to manifold = pressure and rpm. Not the same as what you were developing, but some = similar constraints. I won't be flying again until I get a cataract = lens replace in my one good eye ( not in any hurry without a spare {:>). = But, a project like this would be fun to play with. But, I do agree, getting something with the potential of the FBW out = into the field is a bit daunting, given my past few years dealing with = users with a wide spread of technical savvy. Ed Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com From: Tracy=20 Sent: Monday, March 04, 2013 11:35 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Fly by wire I'm still here Steve (waiting for the Suwannee river to flood), The FBW is installed and working (kind of) in the RV-8 but I decided = not to make it a product after two very scary failures. One was on the = ground which caused the engine to go to full throttle. That was caused = by a heat shrink insulated wire connection shorting to ground where it = was tie-wrapped to the fuel rail. Watch out for this cold flow failure = if you use heat shrink insulated wire splices! Also, know what switches = you need to turn off in a panic to kill the engine.=20 The second failure was a software glitch in the primary controller which = communicated with the EC3 on the serial bus in order to do things like = Hold constant RPM, MP, Fuel Flow, etc. This one happened on final = approach and the engine stopped responding to the throttle quadrant. I = was only 300 ft AGL at the time and would not have made the runway (I = know, bad landing habits) I regained control by switching to the = backup (it has a redundant controller like the EC2/3). The backup did = not have the serial communication links like the primary and it still = worked. I eliminated the Hold functions and the serial connection to = EC3 on primary FBW to eliminate the failure on it. Now all the FBW does = is mirror the movement of the throttle quadrant at the RX-8 throttle = body. These things could be fixed but the idea of trying to debug customer = problems in the field with this much digital systems complexity made me = decide that it was not a good idea. I'll share the schematic & software files if anyone wants to DIY one. = You will need the development tools I use to use them though.=20 Schematic & PC Board files are in DipTrace, software is in Microchip = MPLAB and uses some PIC BASIC PRO compiler routines as well . MPLAB is = free from Microchip BTW. Tracy On Mon, Mar 4, 2013 at 9:22 AM, Stephen Izett wrote: Tracy, are you there? I seem to remember you set up your Rv8/20B originally with the Rx8 fly = by wire throttle. Did you end up using it and developing a controller for it? If so: 1. Are you willing to share the hardware and code you used? 2. Current consumption? 3. Most importantly our thoughts on the value or otherwise of fbw? = (true single lever/pot! or perhaps just another failure mode) Cheers Steve Izett Perth Western Australia -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2899 / Virus Database: 2641/6147 - Release Date: = 03/04/13 ------=_NextPart_000_003C_01CE1906.7CC22700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Tracy,
 
I'd like a set of the fly by wire data you = are=20 willing to share. 
 
 When the Diaz variable pitch prop was in = play, I=20 developed a controller for the blades pitch motor which I later modified = to=20 respond to manifold pressure and rpm.  Not the same as what you = were=20 developing, but some similar constraints.  I won't be flying again = until I=20 get a cataract lens replace in my one good eye ( not in any hurry = without a=20 spare {:>).  But, a project like this would be fun to play=20 with.
 
But, I do agree, getting something with the = potential of=20 the FBW out into the field is a bit daunting, given my past few years = dealing=20 with users with a wide spread of technical savvy.
 
 
Ed
 
Edward L. Anderson
Anderson Electronic = Enterprises=20 LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com

From: Tracy
Sent: Monday, March 04, 2013 11:35 AM
Subject: [FlyRotary] Re: Fly by wire

I'm still here Steve (waiting for the Suwannee river to=20 flood),

   The FBW is installed and working (kind of) = in the=20 RV-8 but I decided not to make it a product after two very scary = failures. =20 One was on the ground which caused the engine to go to full=20 throttle.   That was caused by a heat shrink insulated wire = connection=20 shorting to ground where it was tie-wrapped to the fuel = rail.   Watch=20 out for this cold flow failure if you use heat shrink insulated wire=20 splices!  Also, know what switches you need to turn off in a panic = to kill=20 the engine.

The second failure was a software glitch in the = primary=20 controller which communicated with the EC3 on the serial bus in order to = do=20 things like Hold constant RPM, MP, Fuel Flow, etc.  This one = happened on=20 final approach and the engine stopped responding to the throttle = quadrant. =20 I was only 300 ft AGL at the time and would not have made the runway (I = know,=20 bad landing habits)    I regained control by switching to the = backup=20 (it has a redundant controller like the EC2/3).   The backup did = not have=20 the serial communication links like the primary and it still = worked.  =20 I eliminated the Hold functions and the serial connection to EC3 on = primary FBW=20 to eliminate the failure on it.  Now all the FBW does is mirror the = movement of the throttle quadrant at the RX-8 throttle = body.

These things=20 could be fixed but the idea of trying to debug customer problems in the = field=20 with this much digital systems complexity made me decide that it was not = a good=20 idea.

I'll share the schematic & software files if anyone = wants to=20 DIY one.  You will need the development tools I use to use them = though.=20

Schematic & PC Board files are in DipTrace,  software = is in=20 Microchip MPLAB and uses some PIC BASIC PRO compiler routines as well = . =20 MPLAB is free from Microchip BTW.

Tracy

On Mon, Mar 4, 2013 at 9:22 AM, Stephen Izett = <steveizett@me.com> wrote:
Tracy, are you there?

I seem to remember you = set up=20 your Rv8/20B originally with the Rx8 fly by wire throttle.
Did you = end up=20 using it and developing a controller for it?
If so:
1.  Are = you=20 willing to share the hardware and code you used?
2. Current=20 consumption?
3. Most importantly our thoughts on the value or = otherwise of=20 fbw? (true single lever/pot! or perhaps just another failure=20 mode)

Cheers

Steve Izett
Perth Western=20 Australia


--
Homepage:  http://www.flyrotary.com/
Archive and UnSub: =   http://mail.lancaironline.net:81/lists/flyrotary/List.htm= l

No virus found in this=20 message.
Checked by AVG - www.avg.com
Version: 2013.0.2899 / = Virus=20 Database: 2641/6147 - Release Date: 03/04/13

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