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Engine switch for a rotax 912 uls

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pelletie1959(at)me.com
Guest

Posted: Mon Dec 31, 2018 2:58 pm Post subject: Engine switch for a rotax 912 uls

Hi Bob,



I'm in process to install a Rotax 912 in my airplane. Previously I had a subaru EA81 and I had completed my electrical installation per your diagram with the double ignition. I figure an installation with 2 batteries, no alternator, a ducatti regulator. My airplane is equiped for night flight (nav lights, icom A200, intercom, transponder At 50). I use mechanical engine and flight instruments.)



My question: what is the better schema to switch my electrical installation?



Daniel

Envoyé de mon iPad

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Mon Dec 31, 2018 4:52 pm Post subject: Re: Engine switch for a rotax 912 uls

By "No Alternator", I assume that you mean no external alternator.  But your engine does have an internal dynamo, correct?

Do you have Bob Nuckolls' book?  Download it at http://www.aeroelectric.com/Book/AEC_R12A.pdf

Individual schematics can be downloaded at http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/

Z-16 would be a good starting point.  I would use a 30 amp fuse instead of a dynamo fuselink.

What kind of airplane is it?

Post your intended wiring diagram to get suggestions from others.

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Joe Gores

gilles.thesee(at)free.fr
Guest

Posted: Mon Dec 31, 2018 5:38 pm Post subject: Engine switch for a rotax 912 uls

Le 01/01/2019 à 01:52, user9253 a écrit :

 	  Quote: 	
		   



 By "No Alternator", I assume that you mean no external alternator.  But your engine does have an internal dynamo, correct?

 Do you have Bob Nuckolls' book?  Download it at http://www.aeroelectric.com/Book/AEC_R12A.pdf

 Individual schematics can be downloaded at http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/

 Z-16 would be a good starting point.  I would use a 30 amp fuse instead of a dynamo fuselink.


	


Daniel,



I'll second Joe's answer.

If your engine is a 912, it doesn't require a second battery and Z16 is 

adequate.

But your mention of two batteries rings a bell. Do you rather mean the 

more recent fuel injected, electrically dependent, 912 iS ?

Then it is another kettle of fish and you'll need several separate switches.



Season's greetings

-- 

Best regards,

Gilles

http://contrails.free.fr

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pelletie1959(at)me.com
Guest

Posted: Tue Jan 01, 2019 10:51 am Post subject: Engine switch for a rotax 912 uls

You're right, I have the internal dynamo, but I saw that someone installed an external alternator. My aircraft is a zenair Ch 601 hds.



Thanks for the info, I check that.



Daniel



Envoyé de mon iPad



 	  Quote: 	
		   Le 31 déc. 2018 à 19:52, user9253 <fransew(at)gmail.com> a écrit :

 

 

 

 By "No Alternator", I assume that you mean no external alternator.  But your engine does have an internal dynamo, correct?

 Do you have Bob Nuckolls' book?  Download it at http://www.aeroelectric.com/Book/AEC_R12A.pdf

 Individual schematics can be downloaded at http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/

 Z-16 would be a good starting point.  I would use a 30 amp fuse instead of a dynamo fuselink.

 What kind of airplane is it?

 Post your intended wiring diagram to get suggestions from others.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=486628#486628

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pelletie1959(at)me.com
Guest

Posted: Tue Jan 01, 2019 11:11 am Post subject: Engine switch for a rotax 912 uls

No, it's an old edition 912 UL.



Thanks.



Envoyé de mon iPad



 	  Quote: 	
		   Le 31 déc. 2018 à 20:37, GTH <gilles.thesee(at)free.fr> a écrit :

 

 

 

> Le 01/01/2019 à 01:52, user9253 a écrit :

> 

> 

> By "No Alternator", I assume that you mean no external alternator.  But your engine does have an internal dynamo, correct?

> Do you have Bob Nuckolls' book?  Download it at http://www.aeroelectric.com/Book/AEC_R12A.pdf

> Individual schematics can be downloaded at http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/

> Z-16 would be a good starting point.  I would use a 30 amp fuse instead of a dynamo fuselink.

 

 Daniel,

 

 I'll second Joe's answer.

 If your engine is a 912, it doesn't require a second battery and Z16 is adequate.

 But your mention of two batteries rings a bell. Do you rather mean the more recent fuel injected, electrically dependent, 912 iS ?

 Then it is another kettle of fish and you'll need several separate switches.

 

 Season's greetings

 -- 

 Best regards,

 Gilles

 http://contrails.free.fr

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Wed Jan 02, 2019 10:20 am Post subject: Re: Engine switch for a rotax 912 uls

Use heat conductive paste between the metal base of the Ducatti regulator and the airframe.  Cool the fins with forced air.

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Joe Gores

pelletie1959(at)me.com
Guest

Posted: Wed Jan 02, 2019 2:10 pm Post subject: Engine switch for a rotax 912 uls

Thanks Joe. You have a suggestion for the heat conductive paste?



Envoyé de mon iPhone



 	  Quote: 	
		   Le 2 janv. 2019 à 13:20, user9253 <fransew(at)gmail.com> a écrit :

 

 

 

 Use heat conductive paste between the metal base of the Ducatti regulator and the airframe.  Cool the fins with forced air.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=486659#486659

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jan 02, 2019 2:48 pm Post subject: Engine switch for a rotax 912 uls

At 04:08 PM 1/2/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: DANIEL PELLETIER <pelletie1959(at)me.com>



 Thanks Joe. You have a suggestion for the heat conductive paste? 	


   As I recall, the legacy 912 Ducatti regulators

   had epoxy-fill bases . . . VERY low thermal

   conductivity. Not much opportunity to suck

   more heat out of that side. However, a 12v

   computer fan blowing on the top fins would

   make a HUGE difference.  



 



 

   Bob . . .

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Wed Jan 02, 2019 4:42 pm Post subject: Re: Engine switch for a rotax 912 uls

Yes, the Ducatti Regulator bottom is mostly a non-heat conductive material.

But there is an aluminum perimeter about 5 mm wide that can be coated with

heat conductive paste.  Some people use Zinc oxide that they buy at drug

stores. Others use heat conductive paste from computer stores or from home

improvement stores.  Rotax spark plugs are supposed to be installed with heat

conductive paste.  That same product can be used under the regulator.

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