Today's Message Index:
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1. 06:00 AM - Re: Difference between LR3C and SB1A Regulators (Robert L. Nuckolls, III)
2. 08:13 AM - New horizons (Robert L. Nuckolls, III)
3. 10:19 AM - Re: B&C SD-8 and PM alternators in general (jonlaury)
Message 1
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| Subject: | Difference between LR3C and SB1A Regulators |
At 07:31 PM 1/26/2016, you wrote:
>Thanks Bob
>
>So, normally in flight both field lines (to MAIN ALT and to STANDBY
>ALT) should be On?
>In this case, we can say that theoretically both alternators are
>producing electricity, but there's no current flowing in the wire
>that comes from the "weaker" alternator?
Pretty close . . . It's not easy to parallel two
alternators onto a single bus without special circuitry
within the regulators (not unlike the current sensor
on the B&C standby regulators) that 'steers' the two
alternators into sharing a load. More often than not,
finely tuned but independent regulators drift apart
far enough that one alternator will 'hog' the load
and the other relaxes. We wrestled with that fact
on many of the light twins in TC aviation (C336/337,
B55, C303T, etc.)
We exploited that behavior at B&C in the design of the SB
series regulators by deliberately setting the secondary
regulator 1.0 volt or so BELOW nominal bus voltage.
The behavior was predictable . . . the secondary
alternator's field voltage was suppressed to zero
and although still rotating . . . it produces no
output current.
When the main alternator quits or is shut down, bus
voltage sags and the secondary regulator wakes up
it's companion alternator. We added sensing features
unique to stand-by service to detect this awaking
to light the ALT LOADED annunciator and then to
flash it if present loads on the alternator exceeded
its ratings.
>
>And what about flying with only the MAIN ALT field switch On, and
>the Backup ALT field switch Off, the latter only to be flipped On by
>the pilot when he notices no current is flowing from the MAIN ALT?
>Is this not recommended?
Your choice. In fact . . . should you choose this
mode of operation, it is not necessary to use an
SB series regulator on the standby alternator . . .
nor do you need to adjust it to a lower set-point.
It's simply a second alternator held in reserve to
be brought on line when your ACTIVE NOTIFICATION of
LOW VOLTAGE says the #1 alternator went to sleep
or died.
We'll be exploring operational options for the
next generation of regulators with an goal of
lowering parts counts while improving/simplifying
operability. We've learned quite a lot about this
business over the last 30 years!
Bob . . .
Message 2
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At 11:39 PM 1/26/2016, you wrote:
>Bob,
>We really appreciate your ongoing efforts to make affordable flying safe.
>I am sure there are hundreds, if not thousands
>of lurkers like myself that learn something new on this forum every day.=C2
>...and all this between ambulance driving =C2 <grin>
Thank you sir. Actually, in a 1000 sq/mi
county of only 5300 or so souls, it's pretty
quiet around the hospital . . . a few calls per week.
But for the hospital to maintain it's certifications
the ambulance service needs to be a 24/7/365
operation. Most days of being 'on call' do
not get you out on the road. At the same time,
those who ARE on call have to be minutes away
from responding . . . it can kick a big hole
in your life-options.
We don't expect to be taxed heavily for time
after the classes are completed but the goal
is to reduce on-call loads for all volunteers
to something on the order of 20 hours a month
and few of those will be really busy.
My own availability weekday mornings will
probably have me making patient transfers to
outlying hospitals during times the other
folks are working . . .
Our proximity to the facilities makes it
particularly convenient for us. The Medevac
Helipad is only 1/2 mile east of us on
the county road in front of the house.
Emacs!
Bob . . .
Message 3
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| Subject: | Re: B&C SD-8 and PM alternators in general |
Hi Bob,
Does B&C use SolidWorks as their CAD software? If it does, SW supports E-viewer
whereby a customer/collaborator can view and manipulate 3D SW files, make notations,
generate measurements, hide or make transparent parts of a drawing among
other capabilities. Its very intuitive, needing no manual, and FREE.
My M.E. and I review his production drawings, of a machine I produce, in this way
and hes 300 miles distant.
The website suggests that it supports DWG and DXF drawings from other programs
too.
http://www.edrawingsviewer.com/
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=452360#452360
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