Today's Message Index:
----------------------
1. 04:49 AM - Re: Z13-8b Brown Out Relay Question ? (user9253)
2. 09:22 AM - Two Fuel pumps Z-19RB (Sam Hoskins)
3. 10:29 AM - Re: Two Fuel pumps Z-19RB (Ken)
4. 11:04 AM - Speed Brake Switch (Jon Hults)
5. 12:04 PM - Re: Speed Brake Switch (Jeffrey W. Skiba)
6. 01:54 PM - Re: Speed Brake Switch (Robert Feldtman)
7. 08:52 PM - Re: Speed Brake Switch (Robert McCallum)
Message 1
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| Subject: | Re: Z13-8b Brown Out Relay Question ? |
Bill,
Oops, my mistake. I thought you were talking about the Alternate Feed Relay and
my first reply was in reference to that.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=187958#187958
Message 2
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| Subject: | Two Fuel pumps Z-19RB |
All,
I am looking for a better way to handle switching for my fuel injection fuel
pumps. I have uploaded the diagram here:
http://www.mistakeproofing.net/transfer/N202SH_POWER_DISTRIBUTION_06.pdf
Look in the lower portion of the drawing.
I am using the RWS fuel/ignition controller which has the ability to receive
power from two sources, which should fit well with Z-19.
However, I have added a backup fuel pump. I have a selector switch that
determines which system supplies the fuel pumps. Then, I have added a
switch that will allow me to run either pump, but not both.
The problem is, I have to feed each pump through two switches, doubling my
chance of failure.
Any suggestions?
Thanks.
Sam Hoskins
Quickie Q-200 EFI
Message 3
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| Subject: | Re: Two Fuel pumps Z-19RB |
Sam
I run an oem subaru EFI as my primary. I am not concerned if I happen to
have both fuel pumps on together. With both of my pumps on, the
pressure goes up 2 or 3 psi. The fuel flow change is minuscule
(proportional to the square root of the fuel pressure). Nominal is
around 36 psi above MAP. Actually my engine continues to run if I double
the normal fuel flow. My hazy memory is that the oem pumps draw about 4
amps or so each so that is not a big deal either.
I chose to not give either computer the ability to control the second
fuel pump. Some guys like to retain auto shutdown of both pumps in the
event of a crash but my second pump is not normally on in flight. I
preferred to have no switches or wiring that is common to both pumps
which also simplifies things.
Ken
Sam Hoskins wrote:
> All,
>
> I am looking for a better way to handle switching for my fuel injection
> fuel pumps. I have uploaded the diagram here:
> http://www.mistakeproofing.net/transfer/N202SH_POWER_DISTRIBUTION_06.pdf
> Look in the lower portion of the drawing.
> I am using the RWS fuel/ignition controller which has the ability to
> receive power from two sources, which should fit well with Z-19.
> However, I have added a backup fuel pump. I have a selector switch that
> determines which system supplies the fuel pumps. Then, I have added a
> switch that will allow me to run either pump, but not both.
>
> The problem is, I have to feed each pump through two switches, doubling
> my chance of failure.
>
> Any suggestions?
>
> Thanks.
>
> Sam Hoskins
> Quickie Q-200 EFI
Message 4
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| Subject: | Speed Brake Switch |
Bob & All,
I have a 4-way momentary "China hat" switch on my Infinity Aerospace
throttle handle that I want to use for flaps (up & down) and speed
brakes (fwd & aft). The Precise Flight speed brakes require an ON-OFF
switch because once power is removed, they will close.
Let me preface my question with the fact the electricity is "not my
area"! My question is how do I use the MOM switch to provide continuous
voltage to the speed brake asymmetry module to keep them extended? Does
it require a relay or some other electrical equipment? Or should I just
use an ON-OFF switch somewhere else?
Thanks,
Jon Hults
Lancair Legacy
Message 5
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| Subject: | Speed Brake Switch |
How about a Flip Flop Circuit?
Something like:
http://ourworld.compuserve.com/homepages/Bill_Bowden/page9.htm
see the section for:
"CMOS Toggle Flip Flop Using Push Button"
You would have to build the circuit.
Hoe that helps
Jeff.
Sent: Sunday, June 15, 2008 1:00 PM
Subject: AeroElectric-List: Speed Brake Switch
Bob & All,
I have a 4-way momentary "China hat" switch on my Infinity Aerospace
throttle handle that I want to use for flaps (up & down) and speed brakes
(fwd & aft). The Precise Flight speed brakes require an ON-OFF switch
because once power is removed, they will close.
Let me preface my question with the fact the electricity is "not my area"!
My question is how do I use the MOM switch to provide continuous voltage to
the speed brake asymmetry module to keep them extended? Does it require a
relay or some other electrical equipment? Or should I just use an ON-OFF
switch somewhere else?
Thanks,
Jon Hults
Lancair Legacy
Message 6
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| Subject: | Re: Speed Brake Switch |
aare the speed brakes on the wings? or on the fuselage (like a cozy or Long
EZ)? If on the wings, you'd need to have huge concern about potential
assymetric drag if one side has voltage failure and the other doesn't, could
flip inverted if the drag was serious enough on the wing.
if it is non-asymmetric, then disregard the above safety concern..
bobf
On Sun, Jun 15, 2008 at 12:59 PM, Jon Hults <jkhults@verizon.net> wrote:
> Bob & All,
>
> I have a 4-way momentary "China hat" switch on my Infinity Aerospace
> throttle handle that I want to use for flaps (up & down) and speed brakes
> (fwd & aft). The Precise Flight speed brakes require an ON-OFF switch
> because once power is removed, they will close.
>
> Let me preface my question with the fact the electricity is "not my area"!
> My question is how do I use the MOM switch to provide continuous voltage to
> the speed brake asymmetry module to keep them extended? Does it require a
> relay or some other electrical equipment? Or should I just use an ON-OFF
> switch somewhere else?
>
> Thanks,
> Jon Hults
> Lancair Legacy
>
> *
>
> *
>
>
Message 7
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| Subject: | Re: Speed Brake Switch |
John;
Assuming you wish to use one momentary switch to turn "ON" the circuit
and another (opposite side of the "China Hat") to turn "OFF" the
circuit, two SPDT relays will do the trick. See attached word document.
Please excuse the rudimentary sketch. The quadruple ovals represent the
relay coils. The diode is to protect the switch from the load current.
(assuming the list accepts the attachment)
Bob McC
----- Original Message -----
From: Jon Hults
To: aeroelectric-list@matronics.com
Sent: Sunday, June 15, 2008 1:59 PM
Subject: AeroElectric-List: Speed Brake Switch
Bob & All,
I have a 4-way momentary "China hat" switch on my Infinity Aerospace
throttle handle that I want to use for flaps (up & down) and speed
brakes (fwd & aft). The Precise Flight speed brakes require an ON-OFF
switch because once power is removed, they will close.
Let me preface my question with the fact the electricity is "not my
area"! My question is how do I use the MOM switch to provide continuous
voltage to the speed brake asymmetry module to keep them extended? Does
it require a relay or some other electrical equipment? Or should I just
use an ON-OFF switch somewhere else?
Thanks,
Jon Hults
Lancair Legacy
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