Today's Message Index:
----------------------
1. 07:06 AM - Voltage Regulation (TXYak)
2. 04:34 PM - Re: Voltage Regulation (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
3. 07:52 PM - Fw: FW: PILOT Jessica Cox (cjpilot710@aol.com)
Message 1
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| Subject: | Voltage Regulation |
Question regarding Voltage Regulation in a Yak 52.
First, this is a project airplane and has not been flown yet in the US. I have
gotten it running, but have no voltage regulation. When I first started it,
I had the Gen Fail light at low RPM...as I increased power @ 40% the light went
out(started charging) Around 45% the Gen Fail light would come back on and
pop the overvoltage breaker. I connected a voltmeter to the DMR-200 as I ran
it even if I adjusted the regulation screw...I got no change in voltage. Volts
increase with throttle until 45%RPM and kicks Gen offline at @30.5 volts. I
have tried another voltage regulator(it had been sitting for 6-7 years unused)
got the same symptoms.
Can anyone recommend more places to look, as most of you have a better understanding
of this electrical system than I do. My level of frustration is tempting
me to go with a B & C alternator/regulator. Any advice for or against. If
there is a problem in the system somewhere elsse...I don't want to start frying
B & C's.
Thanks,
Chris Keating
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=232217#232217
Message 2
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| Subject: | Voltage Regulation |
Your problem is... As you have said, ....is clearly a voltage regulation
issue. Your generator is working fine, but is not regulating what-so-ever.
In this mode of operation, the voltage will increase as the speed of the
generator increases. Your over-voltage protection is merely doing it's job
which is a good thing.
Nothing wrong with B&C products. If ease of getting parts and weight is an
issue, go that route! I would not advise the small PMG 10 amp model unless
you seriously think you need it. The bigger 35/45 amp model is the best
investment.
As for fixing yours... Since you tried a new voltage regulator, I suspect
that is not the problem. So it's bound to be a wiring problem. OR.. And
this is the first thing I would check... You have a bad voltage control
potentiometer in the cockpit. Rule of thumb. In electrical systems, things
that fail first usually either move, or are something that human hands mess
with! You need to get a meter and someone who knows how to use it. Ring
out the wiring from the voltage regulator back to the voltage control
resistor in the cockpit and read through it to see if it is working
correctly.
If that checks OK, then check the wiring from the voltage regulator BACK to
the generator (the middle wire on the generator terminal board).
Really.... Going into each and every wire would be too difficult over the
internet and with the written word. There should be a fairly good diagram
pasted to the cover that goes over the electrical panel .. I hope you know
where that is.
If you give up, there is nothing really in the aircraft that will end up
damaging a new B&C system. Most of what is in there is just BY-PASSED and
removed. The over-voltage device, the bucking transformer, the regulator,
the main contactor relay... All come out. You just end up connecting the
output voltage of the new system directly to the output bus bar of the main
contactor relay.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of TXYak
Sent: Thursday, February 26, 2009 10:05 AM
Subject: Yak-List: Voltage Regulation
Question regarding Voltage Regulation in a Yak 52.
First, this is a project airplane and has not been flown yet in the US. I
have gotten it running, but have no voltage regulation. When I first
started it, I had the Gen Fail light at low RPM...as I increased power @ 40%
the light went out(started charging) Around 45% the Gen Fail light would
come back on and pop the overvoltage breaker. I connected a voltmeter to
the DMR-200 as I ran it even if I adjusted the regulation screw...I got no
change in voltage. Volts increase with throttle until 45%RPM and kicks Gen
offline at @30.5 volts. I have tried another voltage regulator(it had been
sitting for 6-7 years unused) got the same symptoms.
Can anyone recommend more places to look, as most of you have a better
understanding of this electrical system than I do. My level of frustration
is tempting me to go with a B & C alternator/regulator. Any advice for or
against. If there is a problem in the system somewhere elsse...I don't want
to start frying B & C's.
Thanks,
Chris Keating
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=232217#232217
Message 3
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| Subject: | Fwd: FW: PILOT Jessica Cox |
I think all us pilots need some inspiration at times.
Pappy
Talk about an inspirational story!!!
Oxford and Cambridge have now decided
to remove the words CAN'T and IMPOSSIBLE
from their dictionary
(http:///)
_Jessica Cox, 25, a girl born without arms,_ (http:///)
stands inside an aircraft.
The girl from Tucson, Arizona
got the Sport Pilot certificate lately
and became the first pilot licensed to fly
using only her feet.
(http:///)
_Jessica Cox of Tucson was born without arms,_ (http:///)
but that has only stopped her from doing one thing:
using the word "can't."
(http:///)
_Her latest flight into the seemingly impossible_ (http:///)
is becoming the first pilot licensed to fly
using only her feet.
(http:///)
_With one foot manning the controls_ (http:///)
and the other delicately guiding the steering column,
Cox, 25,
soared to achieve a Sport Pilot certificate.
Her certificate qualifies her
to fly a light-sport aircraft
to altitudes of 10,000 feet.
(http:///)
_"She's a good pilot. She's rock solid,"_ (http:///)
said Parrish Traweek, 42,
the flying instructor at San Manuel's Ray Blair Airport.
(http:///)
_Parrish Traweek runs PC Aircraft Maintenance_ (http:///)
and Flight Services
and has trained many pilots,
some of whom didn't come close to Cox's abilities.
(http:///)
_"When she came up here driving a car,"_ (http:///)
Traweek recalled,
"I knew she'd have no problem flying a plane."
(http:///)
(http:///)
(http:///)
_Doctors never learned why she was born without arms,_ (http:///)
but she figured out early on
that she didn't want to use prosthetic devices.
(http:///)
Jessica Cox, 25,
earned a license to fly airplanes on October 10, 2008.
Jessica also has two black belts in Tae Kwan-Do,
a college degree in Psychology,
and a thriving career as a motivational speaker.
What doesn't Jessica Cox have?
Arms.
A bilateral congenital limb deficiency
doesn't stop Ms. Cox from achieving
and surpassing her goals.
>From birth on,
her feet became her hands.
She can drive a car,
type 25 words per minute,
and fly an airplane using her feet,
without any special adaptations.
She is the first woman without arms
to earn a license to fly.
"I highly encourage people with disabilities
to consider flying,"
Cox said.
"It helps reverse the stereotype
that people with disabilities are powerless
into the belief that they are powerful and capable
of setting high goals and achieving them."
Jessica earned her Sport Pilot certificate
after training with Able Flight,
a North Carolina flight training company
that specializes in helping people with disabilities
learn to fly.
Ms. Cox won an Able Flight scholarship
and was able to train with instructor Parrish Traweek
free of charge.
inside me lives a thin person but I keep her sedated with chocolate!
**************A Good Credit Score is 700 or Above. See yours in just 2 easy
steps!
%3D62%26bcd%3DfebemailfooterNO62)
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