X-Virus-Scanned: clean according to Sophos on Logan.com From: "Mark Steitle" Received: from mail-wg0-f41.google.com ([74.125.82.41] verified) by logan.com (CommuniGate Pro SMTP 6.1c1) with ESMTPS id 7330707 for flyrotary@lancaironline.net; Wed, 10 Dec 2014 17:39:39 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.41; envelope-from=msteitle@gmail.com Received: by mail-wg0-f41.google.com with SMTP id y19so4898934wgg.28 for ; Wed, 10 Dec 2014 14:39:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=zFPQjyer48+U3KV8DfGMR+JKMkSt5mUzjIA0+0vGD4c=; b=ShEQLg4SjZIqM6HkPZu/0PDBGSKgRihypSMX+7F9v9c1xUc9RqHGa6UPZWhGhbIurW foqSU70Xnm5NQjKUJjY9r+1HjaT4OtMeQfXixGAys8eXj92MPeIGGTic0RYQ4IVHSrfk A1fs3H11gZ7BaVuihBfpjLCTv0YOKdRMhzDB3JMvmhBvr8O2DK2KmgjcW0sxbsYtmI4s zvU95BC1Cwj81zjQEBrf3sURtMjLk4usFfhSfbkCts3JVD+EcUyECD+hkLvw0gWcHq/A Hnh+y9QLrNMBKF7aULOP2oCZqD6eh2LNTWR2m2dnMVnrtoDw43i4loH5jECnmKBIu0Pk 5PxA== MIME-Version: 1.0 X-Received: by 10.194.2.164 with SMTP id 4mr10238624wjv.55.1418251142910; Wed, 10 Dec 2014 14:39:02 -0800 (PST) Received: by 10.27.48.12 with HTTP; Wed, 10 Dec 2014 14:39:02 -0800 (PST) In-Reply-To: References: Date: Wed, 10 Dec 2014 16:39:02 -0600 Message-ID: Subject: Re: [FlyRotary] FW: Rocker vs Toggle Switches To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=047d7b3440e893593a0509e45328 --047d7b3440e893593a0509e45328 Content-Type: text/plain; charset=ISO-8859-1 Dennis, Did you inspect your rocker switches for cloud dust? The stuff is very fine and practically invisible to the naked eye, and is also non-conductive. Could explain your failure. ;-) Thanks for the info and update on your issue. Mark On Wed, Dec 10, 2014 at 3:17 PM, Bobby J. Hughes < flyrotary@lancaironline.net> wrote: > Dennis H ask me to forward this. He's hasn't 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 - # 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 > > --047d7b3440e893593a0509e45328 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Dennis,

Did you inspect your = rocker switches for cloud dust?  The stuff is very fine and practicall= y invisible to the naked eye, and is also non-conductive.  Could expla= in your failure.  ;-)

Thanks for the info and update on y= our issue.

Mark

On Wed, Dec 10, 2014 at 3:17 PM, Bobby J. Hughes <flyrotary@lancaironline.net> wrote:

Dennis= H ask me to forward this. He’s hasn’t been able to post for so= me time now.

 

Bobby

 

From: Denni= s Havarlah [mailto:clouduster@austin.rr.com]
Sent: Tuesday, December 09, = 2014 2:24 PM
To: Bobby J. Hughes
Subject: Rocker vs Tog= gle Switches

=  

BOBBY - I = HAVE TRIED EVERTHING TO GET THIS POSTED ON FLYROTARY - CAN YOU FOWARD TO TH= E WEBSITE IT FOR ME?

<= div>

 

<= /div>

THANKS - DENNIS H.<= span style=3D"font-size:12.0pt;font-family:"Times New Roman",&quo= t;serif""> 

Over a year ago = I had my RX-8 engine quit while on a short flight. (I fly 13 miles to Georg= etown (40XS - GTU) 3 to 5 times a week to play tennis). When the engine qui= t I was at 700 feet above the ground and 6 miles from home. I quickly check= ed the EM-2 and saw the oxygen sensor was off the scale. I turned the mixtu= re 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 l= anding pattern at a low altitude so I did not try anything else.<= /u>

 

I make it home and landed OK. On the ground the engi= ne idled great with the mixture set at 12 o'clock so I went to cruise p= ower 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 tri= ed it many times but it did not act up again..

 <= u>

I talked with Steve Bose, Bobby Hughes and Mark Steitle about the pro= blem and after much head scratching and tests we decided the only logical c= onclusion was that one of the injector circuits must have gone open circ= uit. This would reduce the fuel flow by half but because the injector s= witch was not turned to the off position, the computer did not double the f= uel 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 rocke= r switches I was using to control the injectors were the next suspect s= o I removed them and cut open the switches to inspect the contacts. The con= tacts looked fair but it was found that in the closed position - very li= ttle 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 wi= nds from the south at 25 to 35 mph.

 

I repl= aced 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 – # 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!

 <= /u>

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

 

Dennis Haverlah=

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


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