Today's Message Index:
----------------------
1. 06:09 AM - Re: MP100701 Open Collector To Ground Position Sensor (Robert L. Nuckolls, III)
2. 07:19 AM - Re: RV-8 wiring diagram (tnikkel)
3. 08:18 AM - Re: Question about Z19RB and OVP/Beaker and size wire (Achille)
4. 09:30 AM - Re: RV-8 wiring diagram (user9253)
5. 03:43 PM - Re: MP100701 Open Collector To Ground Position Sensor (William Hunter)
Message 1
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| Subject: | Re: MP100701 Open Collector To Ground Position Sensor |
>d
>
>These magnets are like really... REALLY small and if I place them on
>one corner of the door (one magnet on the door and one on the air
>box structure) then there will be about 2.5 inches of distance to
>the adjacent corner where the magic switch can be installed... then
>perhaps there will be enough distance to reduce any magnetic
>interference. I will buy this sensor and conduct some fiddling
>around and report back.
Ohhhh . . I thought the magnets were going to be CLOSE.
2.5" is like 'across the street'.
If they were, say 0.5" apart, there MIGHT be valid
interaction concerns to be resolved but 2.5" is plenty.
I don't recall now which 60's Cessna used a similar
alternate air door but the magnet holding it closed
was a rather pedestrian cabinet door latch. Gravity
would re-close the door. There were no annunciators
on that system. The door magnet doesn't want/need
to be very stout . . . pressure drop through a clean
filter is, by design, as low as practical . . . measured
in inches of water. You can calculate the force
offered by such differentials and use it to test the
release pressure of the finished assembly.
Just remember that the total force is spread out
over the door area and averages 1/2 the total
applied to center of the door (class 2 lever).
There is a boat load of magnet choices on eBay
including disks with countersunk holes for screw
mounting. http://tinyurl.com/ycoxy94d
A spring-force gage can be crafted to check
the door open calibration.
I think I'd encase the mounted magnet in a layer
of glass . . . while the risk is low, these things
do break and the particles are akin to crushed
carbide . . . not something friendly to engines.
Bob . . .
Message 2
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| Subject: | Re: RV-8 wiring diagram |
Thanks for your comment i appreciate the feed back.
Some of the feeders are bigger than they need to be but that's the wires I have.
I see the downsides of having the start switch on the yoke but i do want it
there. I have an enable switch which disarms the switch on the yoke. The enable
switch also disconnects the e-bus during start.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470104#470104
Message 3
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| Subject: | Re: Question about Z19RB and OVP/Beaker and size wire |
Thank you Bob for your response.
How could I check if my alternator is compatible with en external OVP before wiring
it ? (it is not wired anymore)
It was wired like the picture attached in this message. (drawn by constructeur)
Thank you.
Mickal
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470107#470107
Attachments:
http://forums.matronics.com//files/capture_dcran_2017_06_14__171455_169.png
http://forums.matronics.com//files/capture_dcran_2017_06_14__171448_651.png
http://forums.matronics.com//files/capture_dcran_2017_06_14__170900_296.png
http://forums.matronics.com//files/capture_dcran_2017_06_14__165206_149.png
Message 4
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| Subject: | Re: RV-8 wiring diagram |
OK, I overlooked the switch that isolates the E-Bus during engine start. Your
wiring diagram looks OK to me.
> The enable switch also disconnects the e-bus during start.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470114#470114
Message 5
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| Subject: | MP100701 Open Collector To Ground Position Sensor |
> I thought the magnets were going to be CLOSE.
2.5" is like 'across the street'.
The flapper door is 4 inches long and 2.5 inches wide. Plan A (what is
currently built) has a =BD inch diameter magnet mounted in the middle of
the
2.5 inch door frame=85so not like across the street but in the same
housing
complex. These toothbrush magnets are very strong so perhaps I could
install them on one corner and then the switch on the other corner.
> I don't recall now which 60's Cessna used a similar
alternate air door but the magnet holding it closed
was a rather pedestrian cabinet door latch. Gravity
would re-close the door.
They stole my idea=85HOW RUDE!!!
>There were no annunciators on that system.
Sorta takes the fun out of it=85Well I suppose their engineering budget
was a
bit more than mine so they would not really need a monitoring circuit.
I
could teach my cute little EFIS girl to say =93MONITOR=94 when the door
opens
but I guess that might be too 2017=85a =93light=94 will do.
..
Cheers!!!
Bill Hunter
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L.
Nuckolls, III
Sent: Wednesday, June 14, 2017 6:08 AM
Subject: Re: AeroElectric-List: MP100701 Open Collector To Ground
Position
Sensor
d
These magnets are like really... REALLY small and if I place them on one
corner of the door (one magnet on the door and one on the air box
structure)
then there will be about 2.5 inches of distance to the adjacent corner
where
the magic switch can be installed... then perhaps there will be enough
distance to reduce any magnetic interference. I will buy this sensor and
conduct some fiddling around and report back.
Ohhhh . . I thought the magnets were going to be CLOSE.
2.5" is like 'across the street'.
If they were, say 0.5" apart, there MIGHT be valid
interaction concerns to be resolved but 2.5" is plenty.
I don't recall now which 60's Cessna used a similar
alternate air door but the magnet holding it closed
was a rather pedestrian cabinet door latch. Gravity
would re-close the door. There were no annunciators
on that system. The door magnet doesn't want/need
to be very stout . . . pressure drop through a clean
filter is, by design, as low as practical . . . measured
in inches of water. You can calculate the force
offered by such differentials and use it to test the
release pressure of the finished assembly.
Just remember that the total force is spread out
over the door area and averages 1/2 the total
applied to center of the door (class 2 lever).
There is a boat load of magnet choices on eBay
including disks with countersunk holes for screw
mounting. http://tinyurl.com/ycoxy94d
A spring-force gage can be crafted to check
the door open calibration.
I think I'd encase the mounted magnet in a layer
of glass . . . while the risk is low, these things
do break and the particles are akin to crushed
carbide . . . not something friendly to engines.
Bob . . .
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