Today's Message Index:
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1. 08:22 AM - Re: Question regarding AEC figure Z-11 (Robert L. Nuckolls, III)
2. 11:18 AM - Transmitting causes transponder to turn off (Linda Walker)
3. 03:39 PM - Re: Question regarding AEC figure Z-11 (Robert L. Nuckolls, III)
4. 05:35 PM - Re: Transmitting causes transponder to turn off (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Question regarding AEC figure Z-11 |
At 09:40 AM 9/4/2013, you wrote:
>Hi Bob,
>
>I couldn't find an exact number on the current consumption of the
>Light Speed ignition in their documentation but a search of Vans Air
>Force suggests that it's around 1.5 to 2A max.
Okay, if it's a Lightspeed, I can tell you that the cruising current
draw is on the order of 2.2A
>
>
>The battery is a Odessy PC680 17Ah battery.
>
>I added up the e-bus draw and get 3.4 A (assuming Rx on the radio
>most of the time).
>
>Total current draw including the e-bus and e-ign would be 5.4 Amps.
>So under ideal battery conditions the electrical endurance is 3h
>09min. I feel like that is pretty good. Even with a degraded
>battery, that should provide enough time to at least get to an
>airport. I would want a minumum 1.5 hrs endurance. What do you think?
Keep in mind that the a.h. rating of a battery is almost
never stated at the load current for your design. Most
of the batteries are rated at a 20Hr discharge rate. When discharged
faster, they lose more energy to internal heating and the useful
output drops. An exemplar 17 a.h. battery will deliver 5A for just
over 2 hours . . . WHEN NEW. If you plan to replace when the capacity
drops to 75% of new, then your end of battery life endurance is more like
1.6 hours . . . so this battery seems to fit your design goals.
Emacs!
Adding an SD-8 alternator and making it a Z-13/8 would eliminate
all concerns for battery capacity and the need to periodically
test it for continued airworthiness.
>Also, I have another question. The previous owner who started this
>project did a lot of the firewall forward wiring and he used bus bar
>to connect the contractors, current limiter and starter contractor
>together. Is this a normal practice? Is it ok to have all those high
>current paths exposed like that? Similar to the picture below:
Yes. This is done on a lot of production aircraft too.
Bob . . .
Message 2
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| Subject: | Transmitting causes transponder to turn off |
Bob, and others.=0A=0AWonder if you might comment on the following issue.
=0AYesterday while transmitting on our Garmin 530 the GTX 330 transponder t
urned itself off.=0AThis happened three times, before- it didn't happen a
gain, strange.=0AThey have separate power supply wires through fuses from t
he same bus.=0AAny ideas much appreciated.=0ARegards.=0APatrick Elliott.=0A
G-LGEZ.=0A=0A=0A=0A________________________________
Message 3
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| Subject: | Re: Question regarding AEC figure Z-11 |
At 11:06 AM 9/4/2013, you wrote:
>Hi Bob,
>
>Right, I forgot about the different battery discharge rates varying
>with current draw! I promise I did read the chapter on batteries. :)
Easy to miss . . .
>I'm going to look more closely at the Z-13/8 system and see what I
>what would need to change (and buy) to make that happen.
The installation is stone simple. No re-wiring of
Z-11. Z-13/8 simply adds another layer on top
of Z-11 that offers unlimited endurance at 8A
thus saving 100% of battery content for descent
and approach to landing.
Added weight to the airplane is right at 4 pounds.
Installation hardware is . . .
http://www.bandc.biz/alternator8ampshomebuilt.aspx
http://www.bandc.biz/pmovfilterandovprotectionkit14v.aspx
Bob . . .
Message 4
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| Subject: | Re: Transmitting causes transponder to turn off |
At 01:16 PM 9/4/2013, you wrote:
>Bob, and others.
>Wonder if you might comment on the following issue.
>Yesterday while transmitting on our Garmin 530 the GTX 330
>transponder turned itself off.
>This happened three times, before it didn't happen again, strange.
>They have separate power supply wires through fuses from the same bus.
>Any ideas much appreciated.
Has this ever happened before? How many hours
on the system?
Bob . . .
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