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14 v Gyro on a 12 volt sustem?

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Don G

Joined: 10 Jan 2006
Posts: 156
Location: Central Illinois

Posted: Sat Jan 05, 2008 5:32 pm Post subject: 14 v Gyro on a 12 volt sustem?

Gents,

I am looking at Electric attitude gyros and I have a rotax 912 with a 12 v system in my craft.  My question is, will an insturment listed as a 14 volt perfom ok on a 12 v system?



Thx

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_________________
Don G.
Central Illinois
Kitfox IV Speedster
Luscombe 8A
RV9A

Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Jan 06, 2008 3:10 am Post subject: 14 v Gyro on a 12 volt sustem?

Don G a écrit :

 	  Quote: 	
		   



 Gents,

 I am looking at Electric attitude gyros and I have a rotax 912 with a 12 v system in my craft.  My question is, will an insturment listed as a 14 volt perfom ok on a 12 v system?

   


	


Don,



I installed electric gyros on a Rotax project.

The so-called '12V' Rotax alternator actually outputs about 13.8-14.2 

volts. You'll have no problem, as long as the total current continuous 

draw stays below 12 amps.



Best regards,

-- 

Gilles

http://contrails.free.fr

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nuckolls.bob(at)cox.net
Guest

Posted: Sun Jan 06, 2008 8:05 am Post subject: 14 v Gyro on a 12 volt sustem?

At 12:08 PM 1/6/2008 +0100, you wrote:



 	  Quote: 	
		  

<Gilles.Thesee(at)ac-grenoble.fr>



Don G a écrit :

>

>

>Gents,

>I am looking at Electric attitude gyros and I have a rotax 912 with a 12 

>v system in my craft.  My question is, will an insturment listed as a 14 

>volt perfom ok on a 12 v system?

>



Don,



I installed electric gyros on a Rotax project.

The so-called '12V' Rotax alternator actually outputs about 13.8-14.2 

volts. You'll have no problem, as long as the total current continuous 

draw stays below 12 amps.


	


   I think his question was centered on the gyro,

   not the alternator. He was getting wrapped around

   the 12v battery vs 14v system axle.



   Don, EVERY vehicle with a 12v battery in it operates

   at around 14v when the alternator is producing as

   designed. This is because to CHARGE a 12v battery,

   you need to produce the energy at a voltage level that

   exceeds the battery's voltage by some practical amount.



   Any accessory designed and labeled as "12v" should

   take this fact of physics into account. Chances

   are that your "12-volt gyro" is going to be just

   fine on your 14-volt airplane.



   Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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Don G

Joined: 10 Jan 2006
Posts: 156
Location: Central Illinois

Posted: Sun Jan 06, 2008 1:36 pm Post subject: Re: 14 v Gyro on a 12 volt sustem?

Gilles, 

Thx pard, You are reading  me right.  I thought it surely should work ok, but thought I oughtta ask around, since the investment in an Electric Artifical horizon is pretty substantial.



Bob,

Thx also, but I think the any aircraft with a Rotax 912 for power is classified as a 12 volt system not 14..(I think). My confusion has arrived when looking at all the Attitude Gyros out there, they are listed by voltage in several different ways. Some say 10 to 32v...some say 14...some say 24 or 28V..and on none of the manufacturers website could I find anything listed about minimum voltage, other than some will show the flag when volts get to low...but none say HOW low...

I just love these forums,,for they bring fellas with  practical experience together with fellas who have not been down a particular road yet, and all so very easily.

Smooth air and blue skies to you all!

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_________________
Don G.
Central Illinois
Kitfox IV Speedster
Luscombe 8A
RV9A

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