X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nk11p08mm-asmtp002.mac.com ([17.158.58.247] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6095255 for flyrotary@lancaironline.net; Mon, 04 Mar 2013 17:55:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=17.158.58.247; envelope-from=steveizett@me.com Received: from [10.1.1.4] (58-7-237-83.dyn.iinet.net.au [58.7.237.83]) by nk11p08mm-asmtp002.mac.com (Oracle Communications Messaging Server 7u4-26.01(7.0.4.26.0) 64bit (built Jul 13 2012)) with ESMTPSA id <0MJ5006ZCRNRTVA0@nk11p08mm-asmtp002.mac.com> for flyrotary@lancaironline.net; Mon, 04 Mar 2013 22:55:07 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.9.8327,1.0.431,0.0.0000 definitions=2013-03-04_03:2013-03-04,2013-03-04,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=6.0.2-1203120001 definitions=main-1303040230 From: Stephen Izett MIME-version: 1.0 (Apple Message framework v1283) Content-type: multipart/alternative; boundary="Apple-Mail=_AB86BF46-6E20-4048-8A20-CBECA031735C" Subject: Re: [FlyRotary] Re: Fly by wire Date: Tue, 05 Mar 2013 06:55:03 +0800 In-reply-to: To: Rotary motors in aircraft References: Message-id: <4FBF0A43-38F5-4E44-A4CA-A6FF7C96AA3B@me.com> X-Mailer: Apple Mail (2.1283) --Apple-Mail=_AB86BF46-6E20-4048-8A20-CBECA031735C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Thanks Tracy for the info. I wont be entertaining its use then. How does the Renesis TB work? Is it basically a servo working against a return spring? Steve On 05/03/2013, at 12:35 AM, Tracy wrote: > I'm still here Steve (waiting for the Suwannee river to flood), >=20 > 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 >=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. >=20 > 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. >=20 > 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 >=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. >=20 > Tracy >=20 > On Mon, Mar 4, 2013 at 9:22 AM, Stephen Izett = wrote: > Tracy, are you there? >=20 > 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) >=20 > Cheers >=20 > Steve Izett > Perth Western Australia >=20 >=20 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html >=20 --Apple-Mail=_AB86BF46-6E20-4048-8A20-CBECA031735C Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1
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.

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.

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 = <steveizett@me.com> 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


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