X-Virus-Scanned: clean according to Sophos on Logan.com From: "Stephen Izett" Received: from mail-pa0-f48.google.com ([209.85.220.48] verified) by logan.com (CommuniGate Pro SMTP 6.1c1) with ESMTPS id 7330712 for flyrotary@lancaironline.net; Wed, 10 Dec 2014 17:36:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.220.48; envelope-from=steveize@gmail.com Received: by mail-pa0-f48.google.com with SMTP id rd3so3679327pab.35 for ; Wed, 10 Dec 2014 14:36:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:content-type:message-id:mime-version:subject:date:references :to:in-reply-to; bh=cvJZQa/XM3Y8WJDV3Y4V3jvFPI3XnxgKhqDL67Pa1f0=; b=C8x18v9ac8vS96Yuj7tR3Ly16uBCBN4rdgTkw6cgA+5dRYxbDsEtosvVnAhDltXmkC TTH9PqEhwizj06UAGz21S9607bGiuRlH4NreN31OGnYh2Jql08a0fuLo85cHN/uu67Ef cLh1ZOdgF4HIorZLWdAyRrYS86TqNea/APsBufw1BZeF33znxfYcltFImp8omNsCwwFR n1Y+NE6gF+g+bG+FuwsqgckhBE/HUacMj8m/bcwRUwMnpRMXjtSaxHP6gdRidRZPPbCt QR6IRSnAkd3fziONF5wafhRsIisAhrfX/cOiYwyxbaBFdxdj9/F+paimwb766uBjlK2c 0mOw== X-Received: by 10.68.132.225 with SMTP id ox1mr11046204pbb.85.1418250970692; Wed, 10 Dec 2014 14:36:10 -0800 (PST) Return-Path: Received: from [10.1.1.12] (124-148-81-1.dyn.iinet.net.au. [124.148.81.1]) by mx.google.com with ESMTPSA id cf4sm5142988pbb.3.2014.12.10.14.36.06 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 10 Dec 2014 14:36:09 -0800 (PST) X-Google-Original-From: Stephen Izett Content-Type: multipart/alternative; boundary="Apple-Mail=_9CF7637E-4D35-4A0E-AAFA-150D8608E57F" Message-Id: Mime-Version: 1.0 (Mac OS X Mail 8.1 \(1993\)) Subject: Re: [FlyRotary] Rocker vs Toggle Switches Date: Thu, 11 Dec 2014 06:36:03 +0800 References: To: Rotary motors in aircraft In-Reply-To: X-Mailer: Apple Mail (2.1993) --Apple-Mail=_9CF7637E-4D35-4A0E-AAFA-150D8608E57F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Thanks to Dennis and Bobby. Steve Izett > On 11 Dec 2014, at 5:17 am, Bobby J. Hughes = wrote: >=20 > Dennis H ask me to forward this. He=E2=80=99s hasn=E2=80=99t been able = to post for some time now. > =20 > Bobby=20 > =20 > From: Dennis Havarlah [mailto:clouduster@austin.rr.com = ]=20 > Sent: Tuesday, December 09, 2014 2:24 PM > To: Bobby J. Hughes > Subject: Rocker vs Toggle Switches > =20 > BOBBY - I HAVE TRIED EVERTHING TO GET THIS POSTED ON FLYROTARY - CAN = YOU FOWARD TO THE WEBSITE IT FOR ME? > =20 > THANKS - DENNIS H.=20 > Over a year ago I had my RX-8 engine quit while on a short flight. (I = fly 13 miles to Georgetown (40XS - GTU) 3 to 5 times a week to play = tennis). When the engine quit I was at 700 feet above the ground and 6 = miles from home. I quickly checked the EM-2 and saw the oxygen sensor = was off the scale. I turned the mixture full rich and the engine started = producing some power. It was enough to make it home. I tried the B = controller and the power decreased slightly so I went back to the A = controller. By that time I was close to entering the landing pattern at = a low altitude so I did not try anything else. > =20 > I make it home and landed OK. On the ground the engine idled great = with the mixture set at 12 o'clock so I went to cruise power several = times and it went lean and tried to quit until I made it full rich. I = shut it off and than restarted it. This time it ran perfect!! I tried it = many times but it did not act up again..=20 > =20 > I talked with Steve Bose, Bobby Hughes and Mark Steitle about the = problem and after much head scratching and tests we decided the only = logical conclusion was that one of the injector circuits must have gone = open circuit. This would reduce the fuel flow by half but because the = injector switch was not turned to the off position, the computer did not = double the fuel to the other working injectors.=20 > =20 > I ran tests where I disconnected one set of injectors and duplicated = the problem exactly. I than checked all the wiring but found no = problems. The rocker switches I was using to control the injectors were = the next suspect so I removed them and cut open the switches to inspect = the contacts. The contacts looked fair but it was found that in the = closed position - very little pressure held the contacts closed. After 6 = years of use it appears that the contacts in the leading or trailing = injector circuit did not stay closed completely on this flight. The = flight was quite bumpy with gusty winds from the south at 25 to 35 mph. > =20 > I replaced the rocker switches with very firm snapping toggle switches = (I assume this means high contact pressure). I have not had any more = problems. The rocker switches were purchased from Digi-Key =E2=80=93 # = SW323-ND is one example. I liked the looks of the rocker switches on the = instrument panel at first but now toggle switches look great! > =20 > I highly recommend you only use high quality and/or Mil Spec. toggle = switches for all the engine related electronics. Bobby Hughes has always = advised this! You may find cheaper toggle switches are OK for non = critical applications such as lights. > =20 > Dennis Haverlah > RV-7A ~ 600 hrs. flight time on 4 Port RX-8 Renesis --Apple-Mail=_9CF7637E-4D35-4A0E-AAFA-150D8608E57F Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Thanks to Dennis and Bobby.

Steve Izett
On = 11 Dec 2014, at 5:17 am, Bobby J. Hughes <flyrotary@lancaironline.net> wrote:

Dennis H ask me to forward this. He=E2=80=99= s hasn=E2=80=99t been able to post for some time now.
 
Bobby 
 
From: Dennis Havarlah [mailto:clouduster@austin.rr.com] 
Sent: Tuesday, December 09, 2014 = 2:24 PM
To: Bobby J. Hughes
Subject: Rocker vs Toggle = Switches
 
BOBBY - I HAVE = TRIED EVERTHING TO GET THIS POSTED ON FLYROTARY - CAN YOU FOWARD TO THE = WEBSITE IT FOR ME?
 
THANKS - DENNIS H. 

Over a year ago I had = my RX-8 engine quit while on a short flight. (I fly 13 miles to = Georgetown (40XS - GTU) 3 to 5 times a week to play tennis). When the = engine quit I was at 700 feet above the ground and 6 miles from home. I = quickly checked the EM-2 and saw the oxygen sensor was off the scale. I = turned the mixture full rich and the engine started producing some = power. It was enough to make it home. I tried the B controller and the = power decreased slightly so I went back to the A controller. By that = time I was close to entering the landing pattern at a low altitude so I = did not try anything else.

 

I make it home and = landed OK. On the ground the engine idled great with the mixture set at = 12 o'clock so I went to cruise power several times and it went lean and = tried to quit until I made it full rich. I shut it off and than = restarted it. This time it ran perfect!! I tried it many times but it = did not act up again.. 

 

I talked with Steve Bose, Bobby Hughes and Mark = Steitle about the problem and after much head scratching and tests we = decided the only logical conclusion was that one of the injector = circuits must have gone open = circuit. This would reduce the fuel flow by half but because the = injector switch was not turned to the off position, the computer did not = double the fuel to the other working injectors. 

 

I ran tests where I disconnected one set of = injectors and duplicated the problem exactly. I than checked all the = wiring but found no problems. The rocker = switches I was = using to control the injectors were the next suspect so I removed them = and cut open the switches to inspect the contacts. The contacts looked = fair but it was found that in the closed position - very little = pressure held the contacts closed. After 6 years of use it appears = that the contacts in the leading or trailing injector circuit did not = stay closed completely on this flight. The flight was quite bumpy with = gusty winds from the south at 25 to 35 mph.

 

I replaced the rocker switches with very firm = snapping toggle switches (I assume this means high = contact pressure). I have not had any more problems. The rocker switches = were purchased from Digi-Key =E2=80=93 # SW323-ND is one example. I = liked the looks of the rocker switches on the instrument panel at first = but now toggle switches look great!

 

I highly recommend you = only use high quality and/or Mil Spec. toggle switches for all the = engine related electronics. Bobby Hughes has always advised this! You = may find cheaper toggle switches are OK for non critical applications = such as lights.

 

Dennis Haverlah

RV-7A ~ 600 hrs. flight time on 4 Port RX-8 = Renesis


= --Apple-Mail=_9CF7637E-4D35-4A0E-AAFA-150D8608E57F--