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From: "John Downing" <downing.j@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1846908@logan.com>
Subject: Re: [FlyRotary] Off Topic request - Re: [FlyRotary] ATC fuses with manual or auto-reset 
Date: Tue, 20 Feb 2007 07:56:43 -0500
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Thomas, having spent four years in an electrical harness plant, unless you
know someone in Mexico or Japan to do alittle midnight requisition, I don't
believe you will find those switch's.  JohnD
----- Original Message ----- 
From: "Thomas y Reina Jakits" <rijakits@cwpanama.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 19, 2007 9:26 AM
Subject: [FlyRotary] Off Topic request - Re: [FlyRotary] ATC fuses with
manual or auto-reset


> By the way,
>
> does anyone know a source for OEM-style switches?
> I would like to get some extra equipment for my Toyota, but
> a) OEM switches are outrageously expensive
> b) Not in stock either...
>
> I know there are manufacturers that supply specifically that market, but
for
> some reason I am not capable to find any!!
>
> Thanx for your help,
>
> Thomas J.
>
>
> ----- Original Message ----- 
> From: "Chris Sargent" <rv7rotary@knology.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Sunday, February 18, 2007 6:57 PM
> Subject: [FlyRotary] ATC fuses with manual or auto-reset
>
>
> >
> > Waytek sells the ATC fuses below that have either a manual or auto-reset
> > capability.
> >
> > This offers some options to those deciding between circuit breakers or
> > fuses.
> >
> > Link to the Waytek PDF catalog page:
> >
> > http://order.waytekwire.com/IMAGES/M37/catalog/219_083.PDF
> >
> >
> > 5-30 Amp, low-profile, manual reset (Type 1)
> >
> > 10-30 Amp, manual reset (Type 1)
> >
> > 10-30 Amp, auto-reset (Type 3)
> >
> >
> > 5-30 Amp w push-to-trip test feature
> >
> >
> > Regards,
> > Chris Sargent
> >
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> > Behalf Of Bulent Aliev
> > Sent: Sunday, February 18, 2007 7:19 AM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: CBs and fuses
> >
> > In my plane for everything electrical I installed, I asked myself:
> > can I fly without this item? And accordingly decided on CB or fuse.
> > A CZ builder had followed the plans and had installed the electric
> > nose gear fuse in the "per plans" location under the passenger seat.
> > He takes a passenger for a flight, but on retraction, his nose wheel
> > is cocked , hits the bottom of the fuselage and pops the fuse.
> > Something goes wrong with the manual override too. Now he asks the
> > passenger to unbuckle, turn around and put his butt against the
> > windshield, so he can replace the fuse while flying the plane at the
> > same time. If he had spent few dollars on a CB, he could have pushed
> > it in and flown with the gear down.
> > Buly
> > On Feb 18, 2007, at 7:35 AM, Thomas y Reina Jakits wrote:
> >
> >> Hi Al,
> >>
> >> interesting!!
> >>
> >> Next chance I have I will try to find out more about this
> >> (reasoning for use of fuses over CB's in this helicopter).
> >> I don't really buy the "repair after trip" -reason as the result is
> >> the same.
> >> Whatever caused the fuse or CB to trip, it should be repaired. What
> >> really happens is that the fuse is replaced - if it doesn't trip
> >> immediately, no one will look any deeper into it, than a
> >> "look" (unfortunately...), .... until it trips again.
> >> A lot of trips can be caused by changing environment (heat,
> >> humidity, etc.) that bring the conditions for over current just to
> >> the trip point, but will not under normal conditions.
> >> However I am no specialist, not even building anything at this time
> >> - so, I will try to find out for this specific application (AS350B3)
> >>
> >> Thomas
> >>
> >> PS: First thing I am going to do is to consult the Maintenance/
> >> Repair manual....
> >> ----- Original Message -----
> >> From: Al Gietzen
> >> To: Rotary motors in aircraft
> >> Sent: Saturday, February 17, 2007 6:10 PM
> >> Subject: [FlyRotary] CBs and fuses
> >>
> >>
> >> Eurocopter Factory Instructors are VERY COMPETENT in Eurocopter
> >> Helicopter Systems!!
> >>
> >> There is absolutely NO doubt that he knows the difference between
> >> fuses and breakers and WHY either one would be used.
> >>
> >>
> >> Thomas;
> >>
> >> Certainly not impugning the competence of the flight instructors;
> >> just suggesting the design engineers may have other reasons than
> >> cost.  One may be reliability.  The reliability of CBs goes down
> >> significantly after they have experienced a 'trip'.  I recall
> >> reading one experts opinion that a CB should be replaced after a
> >> 'trip'.  Yeah; seems extreme.  The modern philosophy of circuit
> >> design is to design for fault tolerance, so a fault; once causing
> >> the protection device to open, is left for repair when you land.
> >>
> >>
> >> The key for using fuses is fault tolerant circuit design and proper
> >> selection and sizing of fuses.  Having done this; studies suggest
> >> that the fuse offers higher reliability and lower cost.
> >>
> >>
> >> There certainly reasons for either CBs or fuses, and I have both in
> >> my plane.  For my flight critical circuits I opted for simple,
> >> fault tolerance and fuses.  I wouldn't argue with someone making a
> >> different choice.
> >>
> >>
> >> FWIW,
> >>
> >>
> >> Al
> >>
> >>
> >
> >
> > --
> > 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/
>
>
> --
> Homepage:  http://www.flyrotary.com/
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