REFLECTOR: Battery options

[Michael Watson]

Hi Hiroo,

I also have a Franklin. When I moved from New York to Florida, I started
having a hard time starting after
short turn a round flights.(very hot engine) I replaced my front battery
with an odyssey PC1200 and added an Odyssey PC680
in the rear between the gear bulk head and firewall. The front battery is
used to run the aircraft. When the starter
button is pressed, a contractor in the rear connects the batteries in
parallel and supply enough juice to spin the HOT
engine very fast. A battery isolator keep the rear battery charged during
flight. So far, five years and no more
hot starting problems. I have a ford permanent magnet starter and #2 guage
wire.


On Tue, Feb 11, 2014 at 2:29 PM, Hiroo Umeno <humeno at microsoft.com> wrote:

>  Fellow builders,
>
> I have two Odyssey PC680s in the nose of my plane wired in parallel.
> While this setup works for the most part, starting the big 6 cylinder
> Franklin can be a bit tasking.
>
> I am considering doing something about it when we take the plane apart for
> condition inspection and upgrade next winter.  So...
>
>
>    - Would it make sense to move the batteries to the rear bulkhead close
>    to CG assuming the W&B issue can be worked out in the nose?  This will
>    reduce the wire run length.
>    - Would it make sense to keep the batteries where they are now in the
>    nose and add additional 0-gauge wires (and back) to reduce current loss?
>
>
> I know that going to 24V system will give me less current to drive the
> starter but that is a fairly extensive change on the rest of the aircraft
> systems.
>
> Any other ideas?
>
> Hiroo
>
>
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