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912 ULS Noise Capacitor

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davestapa(at)juno.com
Guest

Posted: Wed Feb 28, 2007 12:09 pm Post subject: 912 ULS Noise Capacitor

Last weekend when running my engine to check static RPM before first

flight my noise capacitor blew. The engine has run several hours with no

problems. I was told by one "airport bum" it was undersized (came from

Skystar- 25 V). He indicated I needed at least 50V. I have looked on Bob

Nuckols site and there is mention of this happening quite often. Seem

with the permanent magnet generator and small motorcycle battery that

comes with the fire wall forward kit there is a problem. Don't understand

all the electronics. But something about over volt surge. I can't find a

source for the capacitor much less a larger one. Also don't want to just

replace it until I understand what's happening. Any help would be

appreciated.



David Estapa

Woodstock, GA

S5TD N97DE

Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Wed Feb 28, 2007 12:48 pm Post subject: Re: 912 ULS Noise Capacitor

Dave I installed one of those noise capacitors from Skystar in my plane and it blew up with a loud bang because I had the polarity reversed.  The plus and minus symbols were so large and so many that I didn't notice them so figured polarity didn't matter.  I eventually traced the radio noise to spark plugs and plug caps and did not install another capacitor.

Tom Jones  



 	  davestapa(at)juno.com wrote: 	
		  Last weekend when running my engine to check static RPM before first

flight my noise capacitor blew. The engine has run several hours with no

problems. I was told by one "airport bum" it was undersized (came from

Skystar- 25 V). He indicated I needed at least 50V. I have looked on Bob

Nuckols site and there is mention of this happening quite often. Seem

with the permanent magnet generator and small motorcycle battery that

comes with the fire wall forward kit there is a problem. Don't understand

all the electronics. But something about over volt surge. I can't find a

source for the capacitor much less a larger one. Also don't want to just

replace it until I understand what's happening. Any help would be

appreciated.



David Estapa

Woodstock, GA

S5TD N97DE

FLIER(at)sbcglobal.net
Guest

Posted: Wed Feb 28, 2007 3:06 pm Post subject: 912 ULS Noise Capacitor

Check Digi-Key at digikey.com.  50V simply gives 

plenty of margin for a large spike.



--- Original Message ---

From: David Estapa <davestapa(at)juno.com>

To: kitfox-list(at)matronics.com

Subject: 912 ULS Noise Capacitor



 	  Quote: 	
		  

<davestapa(at)juno.com>
	


 	  Quote: 	
		  

Last weekend when running my engine to check static 

RPM before first
	


 	  Quote: 	
		  flight my noise capacitor blew. The engine has run 

several hours with no
	


 	  Quote: 	
		  problems. I was told by one "airport bum" it was 

undersized (came from
	


 	  Quote: 	
		  Skystar- 25 V). He indicated I needed at least 50V. 

I have looked on Bob
	


 	  Quote: 	
		  Nuckols site and there is mention of this happening 

quite often. Seem
	


 	  Quote: 	
		  with the permanent magnet generator and small 

motorcycle battery that
	


 	  Quote: 	
		  comes with the fire wall forward kit there is a 

problem. Don't understand
	


 	  Quote: 	
		  all the electronics. But something about over volt 

surge. I can't find a
	


 	  Quote: 	
		  source for the capacitor much less a larger one. 

Also don't want to just
	


 	  Quote: 	
		  replace it until I understand what's happening. Any 

help would be
	


 	  Quote: 	
		  appreciated.



David Estapa

Woodstock, GA

S5TD N97DE



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FLIER(at)sbcglobal.net
Guest

Posted: Wed Feb 28, 2007 3:12 pm Post subject: 912 ULS Noise Capacitor

BTW, that's a 22000uF electrolytic can.  25V should 

be plenty but a 50V won't hurt.  Digi-Key has 

Panasonic manufactured for ~ $11.

--- Original Message ---

From: "flier" <FLIER(at)sbcglobal.net>

To: <kitfox-list(at)matronics.com>, <kitfox-

list(at)matronics.com>

Subject: Re: 912 ULS Noise Capacitor



 	  Quote: 	
		  Check Digi-Key at digikey.com.  50V simply gives 

plenty of margin for a large spike.



--- Original Message ---

From: David Estapa <davestapa(at)juno.com>

To: kitfox-list(at)matronics.com

Subject: 912 ULS Noise Capacitor



>

<davestapa(at)juno.com>

>

>Last weekend when running my engine to check static 

RPM before first

>flight my noise capacitor blew. The engine has run 

several hours with no

>problems. I was told by one "airport bum" it was 

undersized (came from

>Skystar- 25 V). He indicated I needed at least 50V. 

I have looked on Bob

>Nuckols site and there is mention of this happening 

quite often. Seem

>with the permanent magnet generator and small 

motorcycle battery that

>comes with the fire wall forward kit there is a 

problem. Don't understand

>all the electronics. But something about over volt 

surge. I can't find a

>source for the capacitor much less a larger one. 

Also don't want to just

>replace it until I understand what's happening. Any 

help would be

>appreciated.

>

>David Estapa

>Woodstock, GA

>S5TD N97DE

>

>_-

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johnmay

Joined: 10 Nov 2006
Posts: 5
Location: Kalamazoo, Mi.

Posted: Wed Feb 28, 2007 5:35 pm Post subject: 912 ULS Noise Capacitor

David Estapa <davestapa(at)juno.com> wrote:  [quote]  --> Kitfox-List message posted by: David Estapa 



Last weekend when running my engine to check static RPM before first

flight my noise capacitor blew. The engine has run several hours with no

problems. 

   

  Dave,

  My capacitor blew during my wifes first flight in my fox. She already did not like the idea of me buying a plane with fabric covered wings but agreed to go on her first flight with me. We took off and then is when the smoke came billowing up from between her legs. Not knowing what was going to happen next lets just say I got us down fast. Mine had run for 500 hours before it failed.  I purchased an identical replacement on line from Newark Electronics under the catagory "Computer grade [quote][b]

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Feb 28, 2007 6:54 pm Post subject: 912 ULS Noise Capacitor

The Caps are a good idea just don't hook them up in reverse polarity.  The +

to the plus the - to ground.  When I studied electronics we had one young

fellow who loved to "fire off" Lytic Caps.  It got so bad that he almost

destroyed a classroom.  My bad I was the idiot who told him what happens if

you hook up Lytics in reverse.



Not to be out done one other guy used to take great, warped pleasure out of

placing charged caps in the urinal of public washrooms.  Do not under any

circumstances ever do this!



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Feb 28, 2007 7:22 pm Post subject: 912 ULS Noise Capacitor

The cap should be installed on the rectified 12 V current.  A 50V cap would

be reasonable. Just make sure there isn't any slight reverse voltage

entering the capacitor.  Even small reverse voltage spikes will destroy a

lytic in time.



Lytic is short for electrolytic.  These are the fluid filled capacitors that

are polarity sensitive.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Feb 28, 2007 7:27 pm Post subject: 912 ULS Noise Capacitor

22,000uF.... Make sure you short out the terminals of that capacitor with a

well insulated device like an old screwdriver (don't use a new one) before

trying to connect that capacitor into your plane.  22,000uF is more than

enough to give you a most unpleasant shock... Not to mention a small burn.



Noel



[quote] --

_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

clint_bazzill(at)hotmail.
Guest

Posted: Fri Mar 02, 2007 10:47 am Post subject: 912 ULS Noise Capacitor

I Don"t think so.

From: "Noel Loveys" <noelloveys(at)yahoo.ca>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: RE: 912 ULS Noise Capacitor

Date: Wed, 28 Feb 2007 23:56:39 -0330

22,000uF.... Make sure you short out the terminals of that capacitor with a

well insulated device like an old screwdriver (don't use a new one) before

trying to connect that capacitor into your plane.  22,000uF is more than

enough to give you a most unpleasant shock... Not to mention a small burn.

Noel

 > --

davestapa(at)juno.com
Guest

Posted: Sat Mar 03, 2007 5:50 pm Post subject: 912 ULS Noise Capacitor

Thanks to all who responded to my question of the capacitor. I finally

called Lockwood and the operator said "you need the capacitor for the

912S" I ordered it and installed it today. It was a 40V  22,000uF. I ran

the engine to full power this afternoon, got the static RPM I was looking

for, and all is okay. First day the winds are acceptable this thing will

make it's maiden flight.



Do Not Archive



David Estapa

Woodstock, GA

S5TD N97DE



On Wed, 28 Feb 2007 23:56:39 -0330 "Noel Loveys" <noelloveys(at)yahoo.ca>

writes:

 	  Quote: 	
		   

 <noelloveys(at)yahoo.ca>

 

 22,000uF.... Make sure you short out the terminals of that capacitor 

 with a

 well insulated device like an old screwdriver (don't use a new one) 

 before

 trying to connect that capacitor into your plane.  22,000uF is more 

 than

 enough to give you a most unpleasant shock... Not to mention a small 

 burn.

 

 Noel

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