General EI discussion

cjensen · Post by **cjensen** » Tue Jul 11, 2006 9:16 pm

I am leaning towards either 1) Emag/Pmag, 2)Pmag/Pmag, or 3)LASAR. I doubt I'll go LASAR because of cost considerations, but what are your current thoughts on the subject?

A friend of mine says that if you don't go LASAR (which uses mags), you need to have at least one mag in addition to the Emag or Pmag. Thoughts on that?

I see lots of builders going dual E or P, or one of each, no mag.

To make it completely redundant, I plan on two batteries, and two alternators on seperate busses, since EI is dependant on electricity, plus the Pmag supplies it's own power. This is advise from my potential engine builder...

Welllllll...

captain_john · Post by **captain_john** » Wed Jul 12, 2006 6:12 am

I am pretty much following Z13 to a "T".

The dual PMag is my weapon of choice for the time being.

I think dual batteries are a waste of weight. A properly shed system will endure time enough to land with a single Odyessy PC 680.

The electronic displays draw an amazinly low amount of current.

My $0.02 cents...

CJ

cjensen · Post by **cjensen** » Wed Jul 12, 2006 9:06 am

What is "Z13"?

captain_john · Post by **captain_john** » Wed Jul 12, 2006 5:16 pm

WHOA!!!

What is a Z 13!?!

Ok, my friend... we need to talk!

www.aeroelectric.com is Bob's wiring site. On it is all you ever needed to know about wiring an airplane.

See this: http://www.aeroelectric.com/PPS/Adobe_A ... Z13-8L.pdf

...link for a diagram.

I thought you went to an AeroElectric seminar? No? Well, he is very helpful and this diagram will get you on your way. See me if you have any questions. The more I look at it, the more I like it!

It has a backup alternator instead of a backup battery. Waaaaay bettah idear!!!

Read it and get back to me...

CJ

cjensen · Post by **cjensen** » Wed Jul 12, 2006 11:07 pm

Thanks CJ. I'll give it a read tomorrow (Thurs.). I haven't been to an Aeroelectric seminar...yet...it's coming in November...

Mahlon · Post by **Mahlon** » Thu Jul 13, 2006 6:27 am

From an engine perspective redundant electric supply is not necessary if equipped with PMAGS. They have the ability to provide their own power to generate ignition if you should loose the aircraft's electric source. On the other hand, if using two EMAGS then back up electric source is necessary as the EMAGS are not capable of generating their own power. Using a single EMAG and a standard mag will supply back up ignition off the regular mag if the aircraft looses power, as the regular mag does not need electricity to make spark for the engine. Using one EMAG and one PMAG does the same thing only the PMAG would take over all ignition sourcing in the event of the ships power going down. If you used Two PMAGS then you have both ignition systems backed up from a power failure standpoint, instead of just a single unit.
The LASAR system has automatic redundancy built in, as besides supplying electronic ignition they also have a regular mag built into them. If the LASAR fails the mag automatically kicks in so you have the same dual redundancy on LASAR as you would with two PMAGS.
Good Luck,
Mahlon
“The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at you own risk.”

captain_john · Post by **captain_john** » Thu Jul 13, 2006 6:48 am

Thanks Mahlon!

I totally agree. My reason for the backup alternator is for the engine instruments, autopilot, EFIS, radios, navs and other stuff.

I want the luxury of having the option to select a load even while an endurance situation is at hand, depending on the circumstances.

CJ