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Tailwind Electrical System Drawing and Power Analysis

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gerry.vandyk(at)eastlink.
Guest

Posted: Sun Dec 31, 2023 8:05 am Post subject: Tailwind Electrical System Drawing and Power Analysis

Hello again all

Well, with the most recent comments from Joe and Peter, here's what I 

believe may become the final configuration.



I will stipulate, I recognize this is a whole lot more system than the 

airplane needs to fly, however I believe it will be required to have the 

'VFR Only" limitation removed from my flight limitations.  And as 

pointed out by a fellow Canadian in a DM, the panel has been built with 

the "visual field" requirements in the Canadian regs.  Specifically 

backup nav instruments have to be within 12" of pilots centerline, and 

there must be an independent direction instrument.  I'll have a basic 

whiskey compass up on the dashboard, though I might have gotten away 

with the dual ADAHRS units.



As I was revising the drawing this morning I had one of those forehead 

slap moments.  I thought I was being clever using a dpdt relay to run 

both the aux alt and the e-bus.  In fact, if the OV relay tripped, it 

would have taken both items down leaving me with a dark panel.  Joe's 

suggestion of locating the e-bus relay near the battery forced a 

separate relay, which now means when the OV crowbar takes down the aux 

alt relay, the e-bus will now remain powered by the battery.



I'll still welcome any additional comments pointing out deficiencies, 

however I think we might just have this dialed in now.



I hope I can pay the help forward that I've received here.  Thanks to 

everyone.



Cheers

Gerry

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user9253

Joined: 28 Mar 2008
Posts: 1944
Location: Riley TWP Michigan

Posted: Sun Dec 31, 2023 9:18 am Post subject: Re: Tailwind Electrical System Drawing and Power Analysis

 	  Quote: 	
		  however I think we might just have this dialed in now. 	


Not quite.  

The 15A circuit breaker below the overvoltage module is WAY too big.  The 

crowbar over-Voltage module might smoke before that circuit breaker pops.  

The relay coil will draw much less than one amp.  So the circuit breaker could 

be rated at 1A, 3 amps maximum.  Or maybe even use a 5 amp fuse.

.

The E-Bus relay will not work with positive connected to both ends of the relay coil.  

Connect terminal 5 of the E-Bus on-off switch to ground instead of to that 2A fuse.

.

Assuming that the E-Bus relay is located within 6 inches of the battery 

bus, then connect them together with a fusible link.  Eliminate the fusible 

link on the right side of the relay.  Doing that will eliminate one splice.

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_________________
Joe Gores

gerry.vandyk(at)eastlink.
Guest

Posted: Sun Dec 31, 2023 9:58 am Post subject: Tailwind Electrical System Drawing and Power Analysis

Thanks again Joe.  I had already marked up the backup OV breaker to 5 

amps, but you're quite right, on the much smaller alternator 1 or 2 amps 

would be about right.  It's a 5A breaker on the 60 amp alt.



On the E-bus relay, another of those 'facepalm' moments.  I'm showing my 

mechanical engineering side, and not thinking through electrical flow 

properly.  Gotta get better at that.  ;^)



I had the thought of connecting the E-bus relay with the fuseable link, 

but hadn't drawn it that way.  the battery, b-bus and contactor are all 

screwed down to one plate behind the seats, I'll bolt the relay there as 

well.  I'll set up a loop of fuselink to connect the relay, and we 

should be good.



Thanks again, you're help is absolutely invaluable.

Gerry

----

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