X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.229] verified) by logan.com (CommuniGate Pro SMTP 5.1.0) with ESMTP id 1491129 for flyrotary@lancaironline.net; Sat, 21 Oct 2006 11:26:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.229; envelope-from=wdleonard@gmail.com Received: by wx-out-0506.google.com with SMTP id h29so1454975wxd for ; Sat, 21 Oct 2006 08:26:12 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=jGC/paqDV2eKUD44qaxtNb9STKw3hZTuXY6THkcBgwZ/ICcGxxL+VyiKTYE/fN4MGp7uzfjhftBxcuOwl06CzSdEm5shcY4HgCU69fvjvfImt0IPDjhfrDxdl6UVSU4n0LGapLBxmWOQTfb9tpvjU564fNXneIFc5WCEFcpE+Ls= Received: by 10.90.84.17 with SMTP id h17mr1601353agb; Sat, 21 Oct 2006 08:26:11 -0700 (PDT) Received: by 10.90.95.5 with HTTP; Sat, 21 Oct 2006 08:26:11 -0700 (PDT) Message-ID: <1c23473f0610210826xf394b96saa9a6edc218cf50f@mail.gmail.com> Date: Sat, 21 Oct 2006 08:26:11 -0700 From: "David Leonard" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Fuse Ratings for Wiring?? In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_174482_18956239.1161444371641" References: ------=_Part_174482_18956239.1161444371641 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline You make good points Ed, so do Bill and Dave. One last thing no one has mentioned. Noise. The power to my coils (although a critical system) is via fuses in the engine compartment. I would not want to run the power wire for my coils all the way to the panel (to go to a CB) then back into the engine compartment. I think that is asking for noise. I have a fuse box right next to the alternator and the coil power comes right off that and travels about 4 inches to the coils. Minimizes the length of run of those noisy wires and they never leave the FF area. Dave Leonard On 10/21/06, Ed Anderson wrote: > > While I agree (and indeed use my CB in much the same manner - particularly > when trouble shooting), it still seem strange that the manufacture of > those > type aircraft would spend considerable costs to use 10's of dozens of > circuit breakers in each aircraft (and perhaps hundreds of aircraft > manufactured) where a much cheaper/lighter fuse would do the job (just > pull > the fuse for maintenance). But, again this is an area where each can > choose > the approach which makes them feel more comfortable. > > I certainly agree that a fuse of CB can do its fundamental purpose of > protecting a wire from cooking - so functionally its a wash, cost and > complexity do vary between the two approaches. But, I think this again > brings it back to what makes you feel comfortable when flying behind your > rotary engine. > > Going out to fly this wonderful morning > > Ed > ----- Original Message ----- > From: "David Staten" > To: "Rotary motors in aircraft" > Sent: Saturday, October 21, 2006 12:49 AM > Subject: [FlyRotary] Re: Fuse Ratings for Wiring?? > > > > Ed Anderson wrote: > > > >> I can not help but wonder why these type of high value aircraft use > >> circuit breakers rather than fuses. Circuit breakers are in > essence no > >> more than a mechanical switch (we all use those I believe) activated > by > >> heat rather than a finger. But, this debate could (has and will) > >> continue into the future, for sure. > > > > > > For the planes that have a gajillion and one circuits, the breakers can > > serve as a switch for maintenance or troubleshooting of a portion of a > > component system. The switch on the panel may turn the whole system ON > or > > OFF.. an individual actuator or motor may have its own breaker.. for > > example.. > > > > > > > > > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > > > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > -- David Leonard Turbo Rotary RV-6 N4VY My websites at: http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/_ht_a/vp4skydoc/index.html http://leonardiniraq.blogspot.com ------=_Part_174482_18956239.1161444371641 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
You make good points Ed, so do Bill and Dave.
 
One last thing no one has mentioned.  Noise.  The power to my coils (although a critical system) is via fuses in the engine compartment.  I would not want to run the power wire for my coils all the way to the panel (to go to a CB) then back into the engine compartment.  I think that is asking for noise.  I have a fuse box right next to the alternator and the coil power comes right off that and travels about 4 inches to the coils.  Minimizes the length of run of those noisy wires and they never leave the FF area.
 
Dave Leonard

 
On 10/21/06, Ed Anderson <eanderson@carolina.rr.com> wrote:
While I agree (and indeed use my CB in much the same manner - particularly
when trouble shooting), it still seem strange that the manufacture of those
type aircraft would spend considerable costs to use 10's of dozens of
circuit breakers  in each aircraft (and perhaps hundreds of aircraft
manufactured) where a much cheaper/lighter fuse would do the job (just pull
the fuse for maintenance).  But, again this is an area where each can choose
the approach which makes them feel more comfortable.

I certainly agree that a fuse of CB can do its fundamental purpose of
protecting a wire from cooking - so functionally its a wash, cost and
complexity do vary between the two approaches.  But, I think this again
brings it back to what makes you feel comfortable when flying behind your
rotary engine.

Going out to fly this wonderful morning

Ed
----- Original Message -----
From: "David Staten" <Dastaten@earthlink.net>
To: "Rotary motors in aircraft" < flyrotary@lancaironline.net>
Sent: Saturday, October 21, 2006 12:49 AM
Subject: [FlyRotary] Re: Fuse Ratings for Wiring??


> Ed Anderson wrote:
>
>>  I can not help but wonder why these type of high value aircraft use
>> circuit breakers rather than fuses.   Circuit breakers are in essence  no
>> more than a mechanical switch  (we all use those I believe) activated by
>> heat rather than a finger.  But, this debate could (has and will)
>> continue into the future, for sure.
>
>
> For the planes that have a gajillion and one circuits, the breakers can
> serve as a switch for maintenance or troubleshooting of a portion of a
> component system. The switch on the panel may turn the whole system ON or
> OFF.. an individual actuator or motor may have its own breaker.. for
> example..
>
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>



--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/



--
David Leonard

Turbo Rotary RV-6 N4VY
My websites at:
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html
http://leonardiniraq.blogspot.com ------=_Part_174482_18956239.1161444371641--