Jeff:
Addressing your concern, I will only speak to the SDS system. I have a dual SDS
system with a main and backup battery. My system has redundancy in that it has
two fully independent sparkplugs, computers, and power packs. I have two
ignition three-way toggle switches (up-main battery - center off - down the
backup battery). Below, I will describe how I use my system.
I taxi with the backup battery to ensure that this circuit is operational.
During my run-up, I switch to my main battery (both ignitions) and do the
run-up by switching each circuit off and running the engine with a single
ignition. In my experience, I see a very minute RPM drop between one ignition
and the other. If you are afraid of an ignition failure on takeoff, run one
circuit on the main battery and the other on the backup battery, and then
select the main battery once you are at a safe altitude. Switching from main to
backup is so quick that there is no noticeable engine performance drop because
the change is almost instantaneous. The backup battery. BTW the backup battery
is sized for two hours of continuous operation.
The other feature that you will love is the customization of the power curve
and the ease of Lean of Peak configuration. The ignition computer has a
built-in manifold pressure sensor that is used to maximize your engine
performance at altitude. The CPI computer has 64 settings that allow the
programming of ignition retard or advance with reference to load on the engine.
Load information is attained from the MAP (MP) sensor.
Luis R ClaudioN8981SKR2S (or KR25 for the FAA)
On Tuesday, November 15, 2022 at 06:23:22 PM CST, John Gotschall via KRnet
<krnet@list.krnet.org> wrote:
You can use this (or two diodes, but this is probably more robust and cheaper)
to "steer" the electric power to the ignition system from the regular and
backup power sources. Whichever source has the higher voltage will power the
load without back feeding to the lower voltage source. There is no switchover
time or delay, just a constant feed from the higher voltage source.
Disadvantage: it looses 0.56volts internally which is generally negligible.
jg
pic attached below.
On Tue, Nov 15, 2022, 16:00 Jeff York via KRnet <krnet@list.krnet.org> wrote:
I haven't been seeing much activity in the KR group lately so let me see if I
can stir things up a bit?
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