Today's Message Index:
----------------------
1. 06:57 AM - Re: B&C Alternator (Herb Coussons)
2. 08:52 AM - Re: B&C Alternator (Roger Kemp)
3. 10:23 AM - Re: B&C Alternator (Yak Pilot)
4. 12:54 PM - Re: B&C Alternator (Brian Lloyd)
Message 1
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| Subject: | Re: B&C Alternator |
I went by the hanger and looked at mine after some of the recent
discussions - the unit I have is an older one that was designed for
the M14 for acro - it is on a Yak 55M. I took some photos of the
install and tried to trace some of the wiring. It looks much simpler
than what has been described. I also have the info from B&C I will
scan in the computer htis weekend and forward the photos and my best
description of the install.
Herb
On Dec 24, 2007, at 2:19 PM, Roger Kemp wrote:
> <viperdoc@mindspring.com>
>
> Herb (the other Doc),
> Yes, please email them to me. What did you do to regulate the output
> to the
> system?
> Doc
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Herb
> Coussons
> Sent: Monday, December 24, 2007 8:51 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: B&C Alternator
>
>
> I also have a B&C - i just had a small problem with the wiring and
> contacted the company as the unit came on the plane and I had no
> paperwork/diagrams/manuals. They just sent out a nice packet of info
> - the unit seems to work great. if anyone wants the diagrams or
> photos - email mail me.
>
> Herb
>
>
> On Dec 24, 2007, at 8:18 AM, DaBear wrote:
>
>>
>> I have the B&C in my CJ (M14P). It is excellent but expensive. But
>> it mates to the engine just fine.
>>
>> DaBear
>>
>> Tom Johnson wrote:
>>> Interested to hear from those who have installed the B&C or Jasco
>>> alternator in a Yak.
>>> Do any of our regular Yak suppliers have special pricing or is it
>>> all direct?
>>
>>
>>
>>
>>
>>
>
>
Message 2
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Thanks Herb,
Roger
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Herb Coussons
Sent: Friday, December 28, 2007 8:55 AM
Subject: Re: Yak-List: B&C Alternator
I went by the hanger and looked at mine after some of the recent
discussions - the unit I have is an older one that was designed for
the M14 for acro - it is on a Yak 55M. I took some photos of the
install and tried to trace some of the wiring. It looks much simpler
than what has been described. I also have the info from B&C I will
scan in the computer htis weekend and forward the photos and my best
description of the install.
Herb
On Dec 24, 2007, at 2:19 PM, Roger Kemp wrote:
> <viperdoc@mindspring.com>
>
> Herb (the other Doc),
> Yes, please email them to me. What did you do to regulate the output
> to the
> system?
> Doc
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Herb
> Coussons
> Sent: Monday, December 24, 2007 8:51 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: B&C Alternator
>
>
> I also have a B&C - i just had a small problem with the wiring and
> contacted the company as the unit came on the plane and I had no
> paperwork/diagrams/manuals. They just sent out a nice packet of info
> - the unit seems to work great. if anyone wants the diagrams or
> photos - email mail me.
>
> Herb
>
>
> On Dec 24, 2007, at 8:18 AM, DaBear wrote:
>
>>
>> I have the B&C in my CJ (M14P). It is excellent but expensive. But
>> it mates to the engine just fine.
>>
>> DaBear
>>
>> Tom Johnson wrote:
>>> Interested to hear from those who have installed the B&C or Jasco
>>> alternator in a Yak.
>>> Do any of our regular Yak suppliers have special pricing or is it
>>> all direct?
>>
>>
>>
>>
>>
>>
>
>
Message 3
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| Subject: | Re: B&C Alternator |
The small B&C PMG AC Alternator has two blue wires that carry unregulated AC out.
Voltage is strictly dependent on engine RPM. These two wires go to the voltage
regulator. It has the two blue wires coming in from the alternator, and
then a red and black wire out. Black wire goes to ground. Red wire is regulated
output. Some of the regulators, which are in a sealed epoxy case, have a
cut out for an adjustment screw that allows for small regulated voltage adjustments.
The red output wire feeds the aircraft mains.... in any fashion that
you wish. There is also a big electrolytic cap that goes from the regulated output
to ground to filter out some ripple.
If you have the overvoltage protection circuit..... the red output wire goes to
the main contact on a control relay. Normally open contact. The other contact
(common) goes to the aircraft wiring. The relay coil is also powered from
the red regulated output wire, by going to a 2 amp breaker first, then back to
the relay coil. At this point there is a tie point. Into the relay coil is
one, and then the other path is a shunt to ground with the crowbar circuit. If
the voltage goes above 32 voltrs, the crow bar shorts, and blows the 2 amp breaker.
When the relay opens another set of contacts lights the over voltage
warning light in the cockpit.
Lots of wires, it does look complicated but is not really too bad once you visualize
the design.
Mark Bitterlich
p.s. Note on Tom Johnson's problem. It might be wise to keep his set of circumstances
in mind because they are common. He saw the generator dropping out at
a very low RPM with a large current reading on his meter. He saw early generator
cut in. This was caused by bad batteries. It does not say this anywhere.
It was a conclusion developed on an understanding of how the system works.
With no or very low battery voltage, the generator cuts on at 20 volts... i.e.
"early". Since the battery fails load test, it can not hold voltage and current
enough to develop a big enough reverse magnetic field to cause the generator
to drop off. Hence low RPM generator disconnect. This is a story well worth
remembering.
----- Original Message ----
From: Roger Kemp <viperdoc@mindspring.com>
Sent: Friday, December 28, 2007 11:50:10 AM
Subject: RE: Yak-List: B&C Alternator
Thanks Herb,
Roger
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Herb Coussons
Sent: Friday, December 28, 2007 8:55 AM
Subject: Re: Yak-List: B&C Alternator
I went by the hanger and looked at mine after some of the recent
discussions - the unit I have is an older one that was designed for
the M14 for acro - it is on a Yak 55M. I took some photos of the
install and tried to trace some of the wiring. It looks much simpler
than what has been described. I also have the info from B&C I will
scan in the computer htis weekend and forward the photos and my best
description of the install.
Herb
On Dec 24, 2007, at 2:19 PM, Roger Kemp wrote:
> <viperdoc@mindspring.com>
>
> Herb (the other Doc),
> Yes, please email them to me. What did you do to regulate the output
> to the
> system?
> Doc
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Herb
> Coussons
> Sent: Monday, December 24, 2007 8:51 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: B&C Alternator
>
>
> I also have a B&C - i just had a small problem with the wiring and
> contacted the company as the unit came on the plane and I had no
> paperwork/diagrams/manuals. They just sent out a nice packet of info
> - the unit seems to work great. if anyone wants the diagrams or
> photos - email mail me.
>
> Herb
>
>
> On Dec 24, 2007, at 8:18 AM, DaBear wrote:
>
>>
>> I have the B&C in my CJ (M14P). It is excellent but expensive. But
>> it mates to the engine just fine.
>>
>> DaBear
>>
>> Tom Johnson wrote:
>>> Interested to hear from those who have installed the B&C or Jasco
>>> alternator in a Yak.
>>> Do any of our regular Yak suppliers have special pricing or is it
>>> all direct?
>>
>>
>>
>>
>>
>>
>
>
Message 4
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| Subject: | Re: B&C Alternator |
On Dec 28, 2007, at 10:21 AM, Yak Pilot wrote:
> The small B&C PMG AC Alternator has two blue wires that carry
> unregulated AC out. Voltage is strictly dependent on engine RPM.
> These two wires go to the voltage regulator. It has the two blue
> wires coming in from the alternator, and then a red and black wire
> out. Black wire goes to ground. Red wire is regulated output.
> Some of the regulators, which are in a sealed epoxy case, have a
> cut out for an adjustment screw that allows for small regulated
> voltage adjustments. The red output wire feeds the aircraft
> mains.... in any fashion that you wish. There is also a big
> electrolytic cap that goes from the regulated output to ground to
> filter out some ripple.
Ah, you saved me from posting this.
> p.s. Note on Tom Johnson's problem. It might be wise to keep his
> set of circumstances in mind because they are common.
<sigh> Too much complexity. The great thing about an alternator is
that you need one thing to know if it is operating properly: a
voltmeter.
Brian Lloyd 3191 Western Drive
brianl AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C
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