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AIRCAM Schematic or ideas

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toaster73(at)embarqmail.c
Guest

Posted: Wed Sep 26, 2012 10:58 am Post subject: AIRCAM Schematic or ideas

I am beginning to work up an electrical plan for a friends Aircam project, twin Rotax 912's with single battery. Anybody out there have a schematic they would like to share for a twin engine rotax or similar to give me a starting point to look over. I looked at the TECNAM P2006T but I don't think I need the complexity of its system and I do not quite understand the Cross bus switch logic they have. I attached for anyone who wants to comment on it.

Thanks

Chris Lucas

N919AR

RV-10 and Aircam helper

p2006t_manualas_123.pdf

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Sep 26, 2012 12:01 pm Post subject: AIRCAM Schematic or ideas

At 01:57 PM 9/26/2012, you wrote:



 	  Quote: 	
		  I am beginning to work up an electrical plan for a friends Aircam 

project, twin Rotax 912's with single battery. Anybody out there 

have a schematic they would like to share for a twin engine rotax or 

similar to give me a starting point to look over. I looked at the 

TECNAM P2006T but I don't think I need the complexity of its system 

and I do not quite understand the Cross bus switch logic they have.


	


   Obviously, this is a day, fair-weather, vmc fun

   machine. There's no obvious value srtiving for

   a very failure tolerant system. Suggest you wire

   like figure Z16



http://tinyurl.com/7vp9g4e



   Except you have two-fat wire feeders to the

   starter contactors at the engines. These

   same feeders just happen to be a good way

   to bring each alternator in to the battery.



   Run one alternator at a time with second

   for back up.



 	  Quote: 	
		    I attached for anyone who wants to comment on it.


	


   Busy . . .



   Bob . . .

toaster73(at)embarqmail.c
Guest

Posted: Wed Sep 26, 2012 3:17 pm Post subject: AIRCAM Schematic or ideas

Thanks Bob, Z16 is where I was headed but wondered if I was missing something with "twin engines". Definitely not a machine with a need for complexity. 

One clarification... when you say run one alternator at a time do you mean just switch one of the alternators off? How does keeping the designated backup off improve system reliability or procedures?



Busy is a good word for the Tecnam.



-Chris

---

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Sep 26, 2012 4:56 pm Post subject: AIRCAM Schematic or ideas

At 06:14 PM 9/26/2012, you wrote:

 	  Quote: 	
		  



Thanks Bob, Z16 is where I was headed but wondered if I was missing 

something with "twin engines". Definitely not a machine with a need 

for complexity.

One clarification... when you say run one alternator at a time do 

you mean just switch one of the alternators off? How does keeping 

the designated backup off improve system reliability or procedures?



Busy is a good word for the Tecnam.


	




Those alternators are designed to run in parallel on a

single bus. Given the sledge-hammer approach to voltage

regulation, it probably wouldn't hurt anything. At the

same time, if one alternator crapped and both were on,

you wouldn't get a low voltage warning annunciating

the failure. You might land with a dead alternator

and not know it until next preflight.



Better to run one alternator at a time. If it craps,

you've got a second alternator which you'll turn on

when the low voltage warning light flashes . . .

you DO plane active notification of low voltage?





   Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Sep 26, 2012 7:48 pm Post subject: AIRCAM Schematic or ideas

CORRECTION



 	  Quote: 	
		  Those alternators are NOT designed to run in parallel on a

single bus.


	




   Bob . . .

toaster73(at)embarqmail.c
Guest

Posted: Thu Sep 27, 2012 5:52 pm Post subject: AIRCAM Schematic or ideas

Correction noted.

thanks

Chris



--

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Sep 28, 2012 7:53 am Post subject: AIRCAM Schematic or ideas

At 08:51 PM 9/27/2012, you wrote:

 	  Quote: 	
		  



Correction noted.

thanks

Chris


	


   If it were my airplane . . .



http://tinyurl.com/cf2ppmx



http://tinyurl.com/cg8falj



   Bob . . .

toaster73(at)embarqmail.c
Guest

Posted: Sat Sep 29, 2012 4:12 pm Post subject: AIRCAM Schematic or ideas

Thank you Bob, that is very helpful. Can you explain what happens if the

"standby" alternator is activated while the "main" is active?

Thanks

Chris



--

nuckollsr

Joined: 24 Mar 2009
Posts: 95
Location: Medicine Lodge, KS

Posted: Sat Sep 29, 2012 7:02 pm Post subject: Re: AIRCAM Schematic or ideas

Probably nothing serious. But it might mask failure of one alternator when the second one shoulders the loads. A failure that become latent and unnoticed until next preflight.   Better that you know it before you land as opposed to just before you wanted to take off.

toaster73(at)embarqmail.c
Guest

Posted: Sun Sep 30, 2012 4:59 am Post subject: AIRCAM Schematic or ideas

Right, but I was picking up on your comment that the "alternators are not

designed to run parallel on a single bus". 

I have been wondering if there is a load sharing problem that would be

encountered or any other electrical gremlins I am not smart enough to know

about.

Thanks

Chris



--

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