Today's Message Index:
----------------------
1. 06:35 AM - Re: Funny Story (Bobby Paulk)
2. 06:42 AM - Re: Re: Funny Story (ashleysc@broadstripe.net)
3. 06:52 AM - Re: Re: Funny Story (Charlie England)
4. 08:02 AM - Re: Power, signal, and Coax - How should they be bundled? (wsimpso1)
5. 08:22 AM - Re: Re: Power, signal, and Coax - How should they be bundled? (Werner Schneider)
6. 09:45 AM - Re: Re: Power, signal, and Coax - How should they be bundled? (Charlie England)
7. 11:21 AM - Re: Re: Power, signal, and Coax - How should they be bundled? (Matthew S. Whiting)
8. 01:40 PM - Re: Re: Power, signal, and Coax - How should they be bundled? (Charlie England)
Message 1
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Since y'all are discussing interference I'll tell you a funny story. ( not funny
at the time ).
We were building two all metal kit planes in my friends hangar. The rudder cables
were galvanized steel. They were rolled up and put on a shelf but someone relocated
them to the top of a DC welding machine where they stayed for months
while the build went on. When we finally took my plane out to calibrate the compass
it would spin like crazy with just a touch on the rudder pedals. I had located
the remote compass on the bottom skin far aft right between the rudder
cables. We tried de-gauzing to no avail. Finally relocated the compass to highest
point behind the baggage compartment. It turned out to be very accurate.
Bobby
Message 2
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Hi Bobby;
Hi All;
Yes, position of the compass is all important, whether or not you have galvanized
steel control cables.
However, I would recommend stainless steel cables instead. I have seen many older
aircraft, many of them certified aircraft, with rusted control cables.
Cheers! Stu.
----- Original Message -----
From: "Bobby Paulk" <bobbypaulk@comcast.net>
Sent: Saturday, November 18, 2023 6:35:19 AM
Subject: AeroElectric-List: Re: Funny Story
Since y'all are discussing interference I'll tell you a funny story. ( not funny
at the time ).
We were building two all metal kit planes in my friends hangar. The rudder cables
were galvanized steel. They were rolled up and put on a shelf but someone relocated
them to the top of a DC welding machine where they stayed for months
while the build went on. When we finally took my plane out to calibrate the compass
it would spin like crazy with just a touch on the rudder pedals. I had located
the remote compass on the bottom skin far aft right between the rudder
cables. We tried de-gauzing to no avail. Finally relocated the compass to highest
point behind the baggage compartment. It turned out to be very accurate.
Bobby
Message 3
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Not all stainless is non-magnetic, so that might not cure the interference
issue. I hear you on the corrosion issue though.
On Sat, Nov 18, 2023 at 8:44=AFAM <ashleysc@broadstripe.net> wrote:
>
> Hi Bobby;
> Hi All;
> Yes, position of the compass is all important, whether or not you have
> galvanized steel control cables.
> However, I would recommend stainless steel cables instead. I have seen
> many older aircraft, many of them certified aircraft, with rusted control
> cables.
> Cheers! Stu.
>
> ----- Original Message -----
> From: "Bobby Paulk" <bobbypaulk@comcast.net>
> To: aeroelectric-list@matronics.com
> Sent: Saturday, November 18, 2023 6:35:19 AM
> Subject: AeroElectric-List: Re: Funny Story
>
> bobbypaulk@comcast.net>
>
> Since y'all are discussing interference I'll tell you a funny story. ( no
t
> funny at the time ).
> We were building two all metal kit planes in my friends hangar. The rudde
r
> cables were galvanized steel. They were rolled up and put on a shelf but
> someone relocated them to the top of a DC welding machine where they stay
ed
> for months while the build went on. When we finally took my plane out to
> calibrate the compass it would spin like crazy with just a touch on the
> rudder pedals. I had located the remote compass on the bottom skin far af
t
> right between the rudder cables. We tried de-gauzing to no avail. Finally
> relocated the compass to highest point behind the baggage compartment. It
> turned out to be very accurate.
>
> Bobby
===========
===========
===========
===========
===========
>
>
Message 4
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| Subject: | Re: Power, signal, and Coax - How should they be bundled? |
Charlie,
Not Menzimer, using Actuonix P-16P for elevators, P-16L for rudder and aileron.
As light as MAC, fits in my stabilizers, less expensive, rated for dust and condensation,
right speed, and enough back drive resistance to hold settings. I
get the off-axis pushrod loads off the servo with a little bellcrank, and put
adjustable limit switches on the bellcrank after I know where the limits should
be. Using the P version for elevators for position data - calcs say I may need
to fly two trim tab. Flight test will let me know if I can omit the motor
and lock that side, then fly the other or if I have to run them both.
Thanks for the feedback on cable. After searching I just bought separate wires
in same color scheme and will twist them into sets. Stein had not popped in my
search, but I just looked at their site and there it is.
Billski
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=512404#512404
Message 5
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| Subject: | Re: Power, signal, and Coax - How should they |
be bundled?
Billski,
which gear ratio did you use and for what plane type?
Cheers Werner
On 18.11.2023 17:01, wsimpso1 wrote:
>
> Charlie,
>
> Not Menzimer, using Actuonix P-16P for elevators, P-16L for rudder and aileron.
As light as MAC, fits in my stabilizers, less expensive, rated for dust and
condensation, right speed, and enough back drive resistance to hold settings.
I get the off-axis pushrod loads off the servo with a little bellcrank, and put
adjustable limit switches on the bellcrank after I know where the limits should
be. Using the P version for elevators for position data - calcs say I may
need to fly two trim tab. Flight test will let me know if I can omit the motor
and lock that side, then fly the other or if I have to run them both.
>
> Thanks for the feedback on cable. After searching I just bought separate wires
in same color scheme and will twist them into sets. Stein had not popped in
my search, but I just looked at their site and there it is.
>
> Billski
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=512404#512404
>
>
Message 6
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| Subject: | Re: Power, signal, and Coax - How should they |
be bundled?
Looks good. I suspect that the same point that I was trying to make would
still apply; There's no worry about running power & signal in the same
bundle.
On Sat, Nov 18, 2023 at 10:04=AFAM wsimpso1 <wsimpso1@comcast.net> wr
ote:
>
>
> Charlie,
>
> Not Menzimer, using Actuonix P-16P for elevators, P-16L for rudder and
> aileron. As light as MAC, fits in my stabilizers, less expensive, rated f
or
> dust and condensation, right speed, and enough back drive resistance to
> hold settings. I get the off-axis pushrod loads off the servo with a litt
le
> bellcrank, and put adjustable limit switches on the bellcrank after I kno
w
> where the limits should be. Using the P version for elevators for positio
n
> data - calcs say I may need to fly two trim tab. Flight test will let me
> know if I can omit the motor and lock that side, then fly the other or if
I
> have to run them both.
>
> Thanks for the feedback on cable. After searching I just bought separate
> wires in same color scheme and will twist them into sets. Stein had not
> popped in my search, but I just looked at their site and there it is.
>
> Billski
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=512404#51240
> <http://forums.matronics.com/viewtopic.php?p=512404#512404>
>
Message 7
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| Subject: | Re: Power, signal, and Coax - How should they |
be bundled?
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Message 8
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| Subject: | Re: Power, signal, and Coax - How should they |
be bundled?
Thanks for generalizing on my specific point about running power &
signals down separate sides of the fuselage for a trim servo. ;-)
On 11/18/2023 1:19 PM, Matthew S. Whiting wrote:
> The answer is: it depends. For most power (>12 V, low current <10A)
> and most signal (>1 V, slow transition ms to s) lines, it wont
> matter much. However, add in higher currents >>10A, lower voltage <1
> mV, fast transition (ns) and things get dicier. Now, there arent
> many such signals in a light airplane, but some items to pay attention
> to are magnetometers, GPS antennas, cables and connections, CANbus,
> and higher speed switching devices like strobes and such. Even audio
> related devices and cables can be bothered as these often operate at
> mV signal levels.
>
> My philosophy is to do the things at the outset that are fairly easy
> to do. I generally use twisted pair wires for power and return to
> each device unless using the airframe as the return. You can easily
> twist your own with a drill or buy premade twisted pair wire at a very
> small cost premium. And the twisted wires tend to be easy to tie into
> a bundle.
>
> I separate higher current and fast switching wires from signal wires
> such as communication (CANbus, Ethernet, RS232, ARINC 429, etc.), coax
> antenna, etc.
>
> These two simple practices, combined with proper single point
> grounding, will eliminate 99% of possible issues with almost zero
> additional effort and cost.
>
>
> Sent from my iPad
>
>> On Nov 18, 2023, at 12:47PM, Charlie England <ceengland7@gmail.com>
>> wrote:
>>
>>
>> Looks good. I suspect that the same point that I was trying to make
>> would still apply; There's no worry about running power & signal in
>> the same bundle.
>>
>> On Sat, Nov 18, 2023 at 10:04AM wsimpso1 <wsimpso1@comcast.net> wrote:
>>
>> <wsimpso1@comcast.net>
>>
>> Charlie,
>>
>> Not Menzimer, using Actuonix P-16P for elevators, P-16L for
>> rudder and aileron. As light as MAC, fits in my stabilizers, less
>> expensive, rated for dust and condensation, right speed, and
>> enough back drive resistance to hold settings. I get the off-axis
>> pushrod loads off the servo with a little bellcrank, and put
>> adjustable limit switches on the bellcrank after I know where the
>> limits should be. Using the P version for elevators for position
>> data - calcs say I may need to fly two trim tab. Flight test will
>> let me know if I can omit the motor and lock that side, then fly
>> the other or if I have to run them both.
>>
>> Thanks for the feedback on cable. After searching I just bought
>> separate wires in same color scheme and will twist them into
>> sets. Stein had not popped in my search, but I just looked at
>> their site and there it is.
>>
>> Billski
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=512404#51240
>> <http://forums.matronics.com/viewtopic.php?p=512404#512404>
>>
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