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91X ignition shields

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rparigoris

Joined: 24 Nov 2009
Posts: 797

Posted: Fri Aug 06, 2010 3:37 pm Post subject: 91X ignition shields

The older schematics I have for my 914 shows to ground the ignition shutoff wire shields at both ends, the engine side and panel side.



I think I may remember seeing Rotax rethought this?



Question is should I ground shields at both ends?



Thx.

Ron Parigoris

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C_Pickett

Joined: 12 May 2009
Posts: 3
Location: Rehoboth, MA

Posted: Fri Aug 06, 2010 4:45 pm Post subject: Re: 91X ignition shields

A way to remember.  

A conductor is connected on both ends and causes a flow.

A shield is a drain open on one end

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rparigoris

Joined: 24 Nov 2009
Posts: 797

Posted: Fri Aug 06, 2010 8:03 pm Post subject: Re: 91X ignition shields

Hi C_Pickett



I understand the concept of grounding at one end only for RF on radio / avionics install.



Rotax however was very specific in older documentation to shield grounds at both ends.



I think they may have revised  this procedure though??



I don't know reason they chose to ground shield at both ends on older documentation, but they did.



Anyway do you know for a fact that they now recommend only grounding to the engine case and leaving ignition switch end shield ungrounded?



Ron P.

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Fri Aug 06, 2010 8:46 pm Post subject: 91X ignition shields

Ron, For the 914, see the Installation Manual, page 116 refer to Figure 75 that clearly shows the ignition switch wire shielding is grounded at both ends. Also the following, same page, "CAUTION:.....shielding braid (low resistance) on both ends grounded to prevent EMI (e.g.specification MIL 27500/1. And, "the metal base of each ignition switch must be grounded to the aircraft frame to prevent EMI." For the 912, see Installation Manual, page 114 refer to Figure 73, also clearly shows that the ignition wire shielding is grounded at both ends. The wording in the CAUTION is exactly the same. 

Both these are taken from the latest edition of the respective Installation Manuals.

 



Rick Girard



On Fri, Aug 6, 2010 at 11:03 PM, rparigoris <rparigor(at)suffolk.lib.ny.us (rparigor(at)suffolk.lib.ny.us)> wrote:

 [quote]--> RotaxEngines-List message posted by: "rparigoris" <rparigor(at)suffolk.lib.ny.us (rparigor(at)suffolk.lib.ny.us)>

  

 Hi C_Pickett

 

 I understand the concept of grounding at one end only for RF on radio / avionics install.

 

 Rotax however was very specific in older documentation to shield grounds at both ends.

 

 I think they may have revised  this procedure though??

 

 I don't know reason they chose to ground shield at both ends on older documentation, but they did.

 

 Anyway do you know for a fact that they now recommend only grounding to the engine case and leaving ignition switch end shield ungrounded?

 

 Ron P.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=307831#307831

 

 

 

 

 

 

 

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C_Pickett

Joined: 12 May 2009
Posts: 3
Location: Rehoboth, MA

Posted: Sat Aug 07, 2010 4:14 am Post subject: Re: 91X ignition shields

If it is connected on both ends it is a conductor, why they would want that I do not know

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Float Flyr

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

Posted: Sun Aug 08, 2010 5:11 pm Post subject: 91X ignition shields

The industry standard is to ground the shield at the source end only.

Grounding at both ends makes the coax an inductor.



Noel



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