Today's Message Index:
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1. 03:36 AM - Help me write my term paper, but I =?ISO-8859-1?Q?don=99t?= know Where to Sta (gojon1955bo)
2. 08:24 AM - Re: Thread Lacing Tape (donjohnston)
3. 08:50 AM - Re: Re: Thread Lacing Tape (David Carter)
4. 12:23 PM - Re: Re: Thread Lacing Tape (Robert L. Nuckolls, III)
5. 12:33 PM - Re: Re: Thread Lacing Tape (Robert L. Nuckolls, III)
6. 01:22 PM - Re: Canopy antenna? (Peter Pengilly)
7. 01:33 PM - Re: Current-based alternator noise (skywagon185guy)
8. 07:20 PM - Primary and B/U Alt Fields on Master Bus (Bud K)
9. 08:42 PM - Re: Primary and B/U Alt Fields on Master Bus (Art Zemon)
Message 1
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| Subject: | Help me write my term paper, but I =?ISO-8859-1?Q?don=99t?= |
know Where to Sta
Help me write my term paper, but I dont know Where to Start?
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Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501871#501871
Message 2
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| Subject: | Re: Thread Lacing Tape |
On my plane the only place I used zip ties (or tie wraps or whatever you want to
call them) is where using lacing cord was impractical. Mostly hard to reach
places. Used them in the engine compartment and never had a problem. Seems like
every zip tie I've come across in an engine compartment almost disintegrates
when you go to cut it off. I'm sure there are some that are made for that
environment, but I bet they're a lot more money than lacing cord.
I did a couple of running laces but found it easier to just do spot ties.
And I find it much easier to cut a bundle open that's been tied with lacing cord.
With zip ties you have to insert the cutter into the bundle. Always makes
me nervous. With lacing cord you cut the knot outside of the bundle.
Just my two cents.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501874#501874
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| Subject: | Re: Thread Lacing Tape |
Bob posted this link earlier to lacing cord at Aircraft Spruce -
https://tinyurl.com/ydta87er
My question - polyester or nylon?
Thanks,
David
---
David Carter
david@carter.net
>
>
Message 4
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| Subject: | Re: Thread Lacing Tape |
At 10:48 AM 5/12/2021, you wrote:
>Bob posted this link earlier to lacing cord at
>Aircraft Spruce -=C2
<https://tinyurl.com/ydta87er>https://tinyurl.com/ydta87er
>
>My question - polyester=C2 or nylon?=C2
>
>Thanks,
>David
Polyester
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 5
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| Subject: | Re: Thread Lacing Tape |
At 10:23 AM 5/12/2021, you wrote:
>
>On my plane the only place I used zip ties (or tie wraps or whatever
>you want to call them) is where using lacing cord was impractical.
>Mostly hard to reach places. Used them in the engine compartment
>and never had a problem. Seems like every zip tie I've come across
>in an engine compartment almost disintegrates when you go to cut it
>off. I'm sure there are some that are made for that environment,
>but I bet they're a lot more money than lacing cord.
You got that right. Run of the mill tye-wraps
are generally fabricated from Nylon which does
not weather well. Used outdoors exposed to sun
and or other extremes such as temperature swings
and hydrocarbons, the little fellers get brittle.
Rugged tye-wraps are available made from Tefzel
which IS more expensive . . . but not as bad
as when I first encountered them.
Steinair offers these products
https://tinyurl.com/yjcx26kh
The first time I looked these up (about 20
years ago) the little ones were over $1.00
in small quantities.
I can't imagine that one would use more than
say, 50 tye-wraps under cowl which would
have an acquisition cost on the order
of $17. Not too bad . . .
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 6
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Everything is a compromise. Copper tape can be used to create an antenna, the more
of the antenna that is vertical the better the performance. A BNC connector
can be soldered on to the foot, not sure how the ground plane would work, perhaps
it needs to be a dipole? I haven't been very close to anyone who has used
a tape antenna, but my impression was always that they required more maintenance,
and often have worse performance, than installed antennas. How important
is a reliable radio against saving weight?
Peter
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com <owner-aeroelectric-list-server@matronics.com>
On Behalf Of GTH
Sent: 12 May 2021 00:56
Subject: AeroElectric-List: Canopy antenna?
Hello all,
My buddy is building a light carbon fuselage airplane.
The mounting of the comm antenna is envisaged in the fiberglass fin, but in order
to save the 0.5 kg of RG 58 to the tail, we are wondering whether some discreet
antenna could be glued to the underside of the cockpit canopy?
Or maybe some not-too-lossy lighter coaxial and connectors could be used?
Any advice appreciated,
Thanks in advance,
.--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 7
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| Subject: | Re: Current-based alternator noise |
Could be a power diode failure.
On Sun, May 9, 2021 at 2:05 PM Rick Beebe <rick@beebe.org> wrote:
> I have two alternators in my plane. The original belt-driven one is 20
> years old. I'm not sure what exactly it is--the log book says it's an ESI
> 32B19549. It's connected to a B&C LR3B voltage regulator. The second one is
> a B&C BC410-H mounted on the accessory case with an SB1B-14 regulator.
>
> I get a horrid whine from the primary alternator. We discussed that a few
> months ago and it was suggested I check the grounds. I just finished my
> condition inspection and paid close attention to all the grounding and it
> appears to be good. All connections are tight with no corrosion. Measuring
> resistance from the alternator case to the fuselage is only a few milliohms.
>
> The standby alternator is dead quiet.
>
> In flight, the whine isn't too horribly noticeable over the engine noise
> except for when the strobes are on. Today I turned on the pitot heat and
> the whine when from whoop whoop to a constant loud whine. Normal draw, with
> strobes and landing light (which I always leave on) is about 13 amps. If I
> shut off all the lights the draw goes down to 11 amps and at that level the
> whine goes away. With pitot heat on it's 19 amps and the whine is constant.
>
> Thoughts? Does it need to be rebuilt?
>
> Thanks.
>
> --Rick
>
Message 8
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| Subject: | Primary and B/U Alt Fields on Master Bus |
I am planning an avionics upgrade on an RV-4. The airplane currently has and SD-8
back up dynamo as well as an internally regulated alternator. I plan on installing
a Garmin GPS175 and heated pitot and a Dynon Skyview to allow me to fly
IFR. I am planning to rearchitect the electrical system as part of the upgrade.
I plan on implementing an Essential Bus architecture similar to figure
Z-12, dual alternator, single battery.
Question #1. Why are both the primary and B/U alternator fields powered by the
master bus? Wouldn't it be prudent to power at least the B/U alternator field
from the E-bus in case you have to shut down the Master bus, thereby disabling
both alternators? I know that the SD-8 can be 'self exciting', however, if it
is not, the B/U alternator would be shut down.
Question #2. Shouldn't the B/U alternator B lead go the battery side of the Battery
Contactor as opposed to master bus side? Wouldn't that charge the battery
partially offsetting the power draw from E-bus devices.
--------
Bud
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501883#501883
Message 9
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| Subject: | Re: Primary and B/U Alt Fields on Master Bus |
Bud,
It sounds like you are building an airplane with a panel much like I put
into my BD-4C. I have MGL instead of Dynon but also used the GPS175 and
have a heated pitot tube. I started out planning to implement an essential
bus, as you described, until I did my electrical load analysis. I have a
B&C standby alternator which provides about 30 amps when the engine is at
cruise RPM. It turns out that that is sufficient to run everything in the
airplane except the pitot heat and the autopilot servos.
Were I to lose the primary alternator in IMC, the battery could easily
carry the load which the standby alternator could not cover until I reached
VMC and could turn off the pitot heat. Autopilot is optional anyway. That
means that, even without the essential bus, a primary alternator failure is
almost a non-event.
That realization made my electrical system much simpler.
Can you upgrade your SD-8 to a bigger standby alternator?
-- Art Z.
On Wed, May 12, 2021 at 9:31 PM Bud K <budkeil@gmail.com> wrote:
>
> I am planning an avionics upgrade on an RV-4. The airplane currently has
> and SD-8 back up dynamo as well as an internally regulated alternator. I
> plan on installing a Garmin GPS175 and heated pitot and a Dynon Skyview to
> allow me to fly IFR. I am planning to rearchitect the electrical system as
> part of the upgrade. I plan on implementing an Essential Bus architecture
> similar to figure Z-12, dual alternator, single battery.
--
https://CheerfulCurmudgeon.com/
*Friendship is like a stone. A stone has no value, but when you rub two
stones together properly, sparks of fire emerge. *
Rabbi Mordechai of Lechovitz
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