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Bob Nuckolls's Z-14 with dual Lightspeed iii and SD-8

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rduplooy(at)iafrica.com
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Posted: Sun Jan 25, 2009 12:22 pm Post subject: Bob Nuckolls's Z-14 with dual Lightspeed iii and SD-8

Busy building an RV-8 with dual LS Plasma III (crank sensor) and would 

appreciate some input on Z 14 changes required for my set-up.



Engine drives a B & C 60 Amp main Alt, and a SD-8 as back-up .



I wish to install 2 x 17aH batteries as per Bob's drawings and  I would like 

to know whether:-

1) the 2 shunts depicted on Z14 need to be changed to 50mv/60A and 

.50mv/10A.?.



2) Klaus Savier recommends 2 x 5A "pull-able" C.B.s....Could I substitute 

these for fuses of 5A each?



3) Could these be placed as per Z14 , #1 on the Main Batt bus and on Aux 

Batt. the other?



4) Any other changes I should contemplate, as I would like the engine  to 

start only  from the grip of my Infinity stick.



5) I  am also installing a GRT HX  & EIS 4000..any caveats/advice on any 

additional systems/relays required on Z14 for these, or those below??



Many Thanks.



Robert



Bob Archer VOR   antenna in wingtip.

AeroSUN Lites ( Leading edge lights)

Gretz  heated Pitot

Sport AoA

Trutrak IIVSVG

Whelen Nav/Strobes

Christen Inverted Oil System( on Firewall)

Smoking Airplanes smoke-3.5.Gall( either fwd or rear baggage)

Sky Dynamics  cold air and 4-into-1 exhaust

MT 3 blade  C/W Acro Prop

Performanceengines O-360,balanced,flowed with 10:1.

 On second thoughts, maybe I need 3 batteries?

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longg(at)pjm.com
Guest

Posted: Mon Jan 26, 2009 6:23 am Post subject: Bob Nuckolls's Z-14 with dual Lightspeed iii and SD-8

Rob,



I am installing the same dual plasma III in my Lancair. I am however

using Z-13/8 with one battery instead of two. I have yet to hear a good

argument as to why two batteries are better than two alternators. LS

does recommend a 4.5 amp battery behind a Schottky diode which I may

consider paralleling with the main at some time. The diode is about

$2.00 and the battery about $35. This is an easier/lower cost solution

than fussing with all the extras on Z14.



I also found the answer to the constant whining of pilots over fuse

blocks and cb's - use both  You can tell Klaus's lawyers you had them

tied to cb's. If you use the below with the Bussman panel, you now have

the best of both worlds.



See...



https://www.alliedelec.com/Search/ProductDetail.aspx?SKU=6770385

Your shunt should be rated in conjunction with the alternator. No more,

no less. Use the ANL to drop amperage if desired and size the wire in

front and behind it accordingly. Think of the ANL as a step down

transformer, not the shunt. 



You can install whatever battery/alt you choose. Z14 was designed as a

purely redundant system rather than an economical fly to safety system

like Z13/8.



I'm not sure if they sell handi-capped switch for folks that can't reach

the panel from their seat to start the engine, but there's no reason you

couldn't do a relay for the starter switch and even a remote starter if

you have FADEC. For me, I'd rather just lean over, push button - go. $20

and 15 minutes to install a starter button. If you're really lazy you

could wire one of those remotes to open the hanger door, turn on the

lights and start the coffee in the hangar before you get up the hill.

All from the stick.



You need to protect your avionics equipment per the manufacturer

recommendation. I think GRT's are about 3 amps. Remember, you are

protecting the wire in front of the device as well as the devices. If

you are pushing 20A through a wire rated for 3A on your GRT, you've got

something backwards. Remember, step it down before you deliver. Don't

introduce parts and complexity with relay's unless you really need them.

Half of the stuff in my panel is pulling less than 3 amps, even the

strobe lights.



Life is easy, keep it simple. You don't need 3 batteries to be safe. You

do need to give lots of TLC to the one or two batteries you do have and

change them regularly. Don't wait for problems to arise before deciding

you should beef up your system to overcome poor maintenance on your

part.



Most importantly, have fun. Yours sounds like a great system. Let's race

someday. I've got the Aerosport IO-375, Plasma III. 



Glenn

--

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