Today's Message Index:
----------------------
1. 03:43 AM - Automatic header tank filling (Peter Sokolowski)
2. 11:05 AM - Re: Automatic header tank filling (Robert L. Nuckolls, III)
3. 11:59 AM - Re: IVO Prop current limiter (kfav8r)
4. 07:51 PM - Dsub Connector Shell With Female Threaded (William Hunter)
5. 08:23 PM - Re: Dsub Connector Shell With Female Threaded (don van santen)
6. 08:27 PM - Re: Dsub Connector Shell With Female Threaded (Daniel Hooper)
7. 08:44 PM - Re: Dsub Connector Shell With Female Threaded (Art Zemon)
Message 1
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Subject: | Automatic header tank filling |
Hi,
I am flying a Lancair 360 with wing tanks and the standard header tank.
Rather thinking every 20 to 30 minutes to fill up the header tank again I
would like to have an automatism filling the tank.
I have a capacitive fuel gauge (output 0 to 5 V) and an independent
emergency reminder looking up at the annunciator panel @ about 5 gallons.
Rather re-inventing the wheel - is there a circuit diagram out there I can
use for such a fuel filling mimic ?
Thanks in advance,
Peter
LNC 360 MKII
D-EPSO
Message 2
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Subject: | Re: Automatic header tank filling |
Hi,
I am flying a Lancair 360 with wing tanks and the
standard header tank. Rather thinking every 20 to
30 minutes to fill up the header tank again I
would like to have an automatism filling the tank.
I've done a couple of similar systems. Last
one was for the Piaggio P-180.
I have a capacitive fuel gauge (output 0 to 5 V)
and an independent emergency reminder looking up
at the annunciator panel @ about 5 gallons.
The analog output makes the 'control' easy to do.
The dragon to slay is failure mitigation.
Any time you add a automatic feature to the
airplane, it's wise to assume that it will
fail at some point.
What are the ways it can fail? How will you
become aware of the failure? Is the failure
pre-flight detectable? What are plans A, B, etc.
for dealing with the failure(s)?
You have a low level warning light . . . this should
be totally independent of any other function.
Suppose the transfer sticks ON and overfills the
tank. What happens if the tank is over filled;
what happens to excess fuel? Is there a practical
way to add a high level warning?
Rather re-inventing the wheel ' is there a
circuit diagram out there I can use for such a fuel filling mimic ?
You can watch the dc voltage from the
fuel gage with a comparator that will,
for example, turn the transfer ON at
3 volts or below and OFF at 4 volts or
above . . . or what ever hysteresis values
seem most practical.
The existing low level warning backs up
a failure to transfer, some kind of high
level warning should back of a failure to
stop transferring.
Bob . . .
Message 3
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Subject: | Re: IVO Prop current limiter |
Will do Bob. Thanks!
--------
Doug
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469718#469718
Message 4
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Subject: | Dsub Connector Shell With Female Threaded |
Hi All,
I have a couple of instances where I need to mate a male Dsub to a female
Dsub end to end within the length of a wire bundle (example: connect the
under panel wire harness to the wire harness of the control stick).
I already have the male and female Dsub connectors wired up and they are
connected end to end and I have the plastic shells (see below) however the
metal screws of the one shell needs to screw into a threaded bore of the
other connector so that the two connectors do not disconnect. Kinda like
when you attach the Dsub connector to the back of a computer the plug slides
into the receptacle and then the screws on the connector shell thread into
the threaded bore of the computer case.
How does one (me) do this on an end to end connector?
..
Cheers!!!
Bill Hunter
Message 5
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Subject: | Re: Dsub Connector Shell With Female Threaded |
multiple ways to to this
1 buy one connector with built in nuts (Stein has these)
2 remove screws and use zip ties to hold the connectors together.
On May 30, 2017 19:56, "William Hunter" <billhuntersemail@gmail.com> wrote:
> Hi All,
>
>
> I have a couple of instances where I need to mate a male Dsub to a female
> Dsub end to end within the length of a wire bundle (example: connect the
> under panel wire harness to the wire harness of the control stick).
>
>
> I already have the male and female Dsub connectors wired up and they are
> connected end to end and I have the plastic shells (see below) however the
> metal screws of the one shell needs to screw into a threaded bore of the
> other connector so that the two connectors do not disconnect. Kinda like
> when you attach the Dsub connector to the back of a computer the plug
> slides into the receptacle and then the screws on the connector shell
> thread into the threaded bore of the computer case.
>
>
> How does one (me) do this on an end to end connector?
>
>
> [image:
> http://www.steinair.com/wp-content/uploads/2016/03/SA-1030-BACKSHELL-DSUB15-L-DSC09853.jpg]
>
>
> ..
>
>
> Cheers!!!
>
>
> Bill Hunter
>
>
Message 6
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Subject: | Re: Dsub Connector Shell With Female Threaded |
I think you want something like this female screw kit:
http://www.mouser.com/search/ProductDetail.aspx?qs=5KjJMQyy%252baNdw8WXW
xtgeQ%3d%3d
<http://www.mouser.com/search/ProductDetail.aspx?qs=5KjJMQyy%2baNdw8WXWx
tgeQ==>
It attaches to the contact portion before you install the back shell.
Each one should contain a kit for one connector pair, and you can just
use the provided male threaded hardware with the other one.
Be careful to either tighten the female nuts adequately or use some
Loctite to keep the nuts from falling out if you ever need to separate
the two connectors.
Here is a similar part from SteinAir
http://www.steinair.com/product/dsub-nut-pack-4-40-thread-size/
<http://www.steinair.com/product/dsub-nut-pack-4-40-thread-size/>
or you can also buy one with built in female lugs like this:
http://www.steinair.com/product/9-pin-male-dsub-connector-with-4-40-lugs/
<http://www.steinair.com/product/9-pin-male-dsub-connector-with-4-40-lugs/
>
These last ones are nice because you never have to worry about the lugs
backing out when you take the connectors apart!
> On May 30, 2017, at 9:49 PM, William Hunter
<billhuntersemail@gmail.com> wrote:
>
> Hi All,
>
> I have a couple of instances where I need to mate a male Dsub to a
female Dsub end to end within the length of a wire bundle (example:
connect the under panel wire harness to the wire harness of the control
stick).
>
> I already have the male and female Dsub connectors wired up and they
are connected end to end and I have the plastic shells (see below)
however the metal screws of the one shell needs to screw into a threaded
bore of the other connector so that the two connectors do not
disconnect. Kinda like when you attach the Dsub connector to the back
of a computer the plug slides into the receptacle and then the screws on
the connector shell thread into the threaded bore of the computer case.
>
> How does one (me) do this on an end to end connector?
>
>
> <image002.jpg>
>
> ..
>
> Cheers!!!
>
> Bill Hunter
Message 7
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Subject: | Re: Dsub Connector Shell With Female Threaded |
Bill,
I hate those screws. I have seen barrel connectors which are female on both
ends, stuck between two D-sub shells. They require having a screwdriver on
both ends, Pain-in-the-a**.
I am planning to use a pair a zip ties in a X in the places where I have
D-sub connectors in my plane. I would rather cut and replace the zip ties
than mess around with the screws.
I will be really interested to see if anyone has better ideas.
-- Art Z.
On Tue, May 30, 2017 at 9:49 PM, William Hunter <billhuntersemail@gmail.com>
wrote:
> Hi All,
>
>
> I have a couple of instances where I need to mate a male Dsub to a female
> Dsub end to end within the length of a wire bundle (example: connect the
> under panel wire harness to the wire harness of the control stick).
>
>
> I already have the male and female Dsub connectors wired up and they are
> connected end to end and I have the plastic shells (see below) however the
> metal screws of the one shell needs to screw into a threaded bore of the
> other connector so that the two connectors do not disconnect. Kinda like
> when you attach the Dsub connector to the back of a computer the plug
> slides into the receptacle and then the screws on the connector shell
> thread into the threaded bore of the computer case.
>
>
> How does one (me) do this on an end to end connector?
>
>
> [image:
> http://www.steinair.com/wp-content/uploads/2016/03/SA-1030-BACKSHELL-DSUB15-L-DSC09853.jpg]
>
>
> ..
>
>
> Cheers!!!
>
>
> Bill Hunter
>
>
--
https://CheerfulCurmudgeon.com/
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
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