Today's Message Index:
----------------------
1. 08:43 AM - Re: FW: M9F Coil (Bitterlich, Mark G CIV NAVAIR, WD)
2. 09:01 AM - Re: Re: Alternator Putting out MAX Current (Bitterlich, Mark G CIV NAVAIR, WD)
Message 1
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Thanks to all. He already found one.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp M.D.
Sent: Monday, September 02, 2013 22:14
Subject: Re: Yak-List: FW: M9F Coil
--> <viperdoc@mindspring.com>
Doug Sapp had some the last time I needed one.
Doc
Sent from my iPad
On Sep 2, 2013, at 6:22 PM, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
wrote:
> --> <mark.bitterlich@navy.mil>
>
>
> Sergei needs a coil... can anyone help?
>
> reply to s_boriak@yahoo.com
>
>
>> From: Sergei Boriak [s_boriak@yahoo.com]
>> Sent: Sunday, September 01, 2013 11:05 AM
>> To: Bitterlich, Mark G CIV NAVAIR, WD; Mark Bitterlick WA3JPY; Mark
>> Bitterlick WA3JPY
>> Subject: M9F Coil
>>
>> Hi Mark,
>>
>> I am looking for Magneto coil for M9F.
>>
>> Cheers
>>
>> Sergei
>
>
Message 2
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| Subject: | Re: Alternator Putting out MAX Current |
The only thing I would recommend would probably be an AGM type battery, although
Gell Cell is ok as well. Typically people use two of the 12 volt 18 Amp Hour
jobs. It really just depends on making a really strong container to replace
the original.
I fly a YAK-50, so weight and balance is something to be concerned with. The only
real danger I have seen is running batteries that are way too small, which
end up being over-charged and vented easily. This can be a sneaky event that
results in all kinds of bad things happening to avionics and other things as
well.
My recommendation would be to run a load test on your batteries once a year at
least. If you can't do that, then simply go to your airplane and turn everything
on with a good meter hooked to the batteries. Or, just turn on the Master
and then Pitot Heat for less than 10 seconds. Look at your battery voltage and
if it sags below 21 volts or so, it's time to get new ones. My experience
is that it is better to buy cheaper AGM batteries and replace them often, than
it is to buy really expensive batteries and try to make them last too long.
Always replace them in pairs versus one at a time, and never hook a wire in the
middle of two series batteries to power something that requires 12 volts. That
is the perfect way to cause an early death to one battery and possible additional
avionics damage.
Mark
p.s. The design of the stock Russian generator charging system RELIES on good
batteries in order to DISCONNECT the generator at low RPM. This is the kind of
"sneaky" problem I was mentioning. If the batteries are very weak, and the
generator output goes below battery voltage there will not be enough reverse current
to trip out the DMR-200 reverse current relay, and the generator will stay
engaged and your main battery rail will drop WELL below 24 volts. This kind
of voltage sag can be less than good to some types of avionics. You'll notice
this when you bring your engine to idle and you do NOT see the "GEN" light
come on.
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Patrick Ashura
Sent: Monday, September 02, 2013 19:53
Subject: Re: Yak-List: Re: Alternator Putting out MAX Current
Mark- do you recommend a specific battery for the Yak?
PJ Ashura
Sent from my iPhone
On Sep 2, 2013, at 19:17, "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich@navy.mil>
wrote:
> --> <mark.bitterlich@navy.mil>
>
> Roger that. I am sure someone around has a 12 volt charger, so just FYI what
you could have done was to charge one 12 volt battery at a time. There is a
lot to talk about here, a few things more to consider.
>
> 1. I am assuming you are using GEL CELL batteries. If that is true, typically
these batteries have a maximum charge current listed on their specifications.
Those will be exceeded when throwing them into the airplane and going flying.
Hard to say what can happen here specifically, but plate warping, gassing,
are in the list of things that might happen. All resulting in reduced battery
life.
>
> 2. A lot of small aircraft alternators are not really designed for continuous
current at maximum ratings. I.E. an SK-35 alternator and regulator could get
pretty darn hot running that kind of output over the long term. Failure of
alternator and/or regular HAS happened to some owners. Realize you're dealing
with about 1000 watts of energy here. Lots of heat in a kilowatt.
>
> 3. Some 12 volt chargers have selectable charging currents... those are the
ones you want to use for your batteries. They will sometimes actually allow you
to select the type of battery you are charging. If there is no other choice,
turn off EVERYTHING you can to reduce current draw while the batteries are
charging like this. And cross your fingers.
>
> 4. You might want to check the maximum charging voltage for your batteries,
and possibly crank the B&C output down to match that recommendation. Not the
end of the world if you do not, but a charging voltage over the maximum listed
will reduce the lifetime of the batteries by causing them to gas.
>
> Bear, are you reading this? If so, tell the world your story! :-)
>
> Yes indeedy. The Battery Minder:
>
> http://www.batterystuff.com/battery-chargers/24-volt/aircraft/BM24041A
> A-S2.html
>
> Works like gangbusters! It will extend the life of your battery .... and has
to be the best darn battery charger I have ever purchased in my life. Not really
a battery "charger" per se, actually just like it says, a "maintainer".
Not cheap... but an extremely wise purchase and worth every cent. Realize I very
rarely endorse a specific product. This is an exception.
>
> Mark
>
> ________________________________________
> From: owner-yak-list-server@matronics.com
> [owner-yak-list-server@matronics.com] on behalf of ChangDriver
> [capav8r@gmail.com]
> Sent: Monday, September 02, 2013 8:57 AM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: Alternator Putting out MAX Current
>
>
> Mark:
>
> Thanks for the last advice. I got thrown off by the batteries being new and
the terminal voltages being 12.1 on each battery and the system showing 24.2 volts.
If we had electric starters in out planes we would notice this immediately
as the current demand on the batteries would exceed what they could do if
depleted. The regulator was doing its job the entire time by holding bus voltage
at 28.8 (the B&C set point for a 24 v regulator).
>
> I did not have a charger so I opted to allow the alternator to do the job. When
I saw 35 amps out at t/o rpm, I had visions of heat in the B lead and heat
in the alternator. So, the option of running at a lower amperage for a period
of time to charge the batteries was my only option. Thus allowing the alternator
to put out less than rated power for the test/charging flight.
>
> A battery minder might not be a bad idea it I don't fly often.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=407913#407913
>
>
>
>
>
>
>
>
>
>
>
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