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icubob(at)newnorth.net
Guest

Posted: Thu Jan 05, 2006 4:45 pm Post subject: AeroElectric-List:



Hi all,

I have been thinking an ''idiot light'' to tell me when the master is left on would be handy. Of course , i learned this the hard way. Now it has occurred to me that light would become annoying after a while. After thinking about it i decided it wouldnt work to wire it to the same terminal on the ign. switch that grounds the ignition [ I am only very slowly learning a little about all of this] so now I am thinking to put a relay on to the lead from the alt . This relay would only close when power from the alternator stopped. Then my idiot light would go on. Am I reinventing the alt. warning light? I havent seen the need for a warning light as I plan to have an eis with alarms. Will my idea work and is there any schematic anywhere in Bob's book that would get me thru this? thanks in advance

Bob Noffs

skywagon(at)charter.net
Guest

Posted: Thu Jan 05, 2006 5:30 pm Post subject: AeroElectric-List:



Bob,

What I would suggest..... if you have a rudder tip strobe or similar, leave

it on all the time. If you step out of the bird and forget the master,

usually the strobe blinking away will get your attention before you leave

and remind you of the Master left on.

David

stevea(at)svpal.org
Guest

Posted: Thu Jan 05, 2006 5:34 pm Post subject: AeroElectric-List:

`bob noffs wrote: Hi all, I have been thinking an ''idiot light'' to tell me when the master is left on would be handy. Bob,`

If you have an oil pressure switch to activate a Hobbs (hour meter),
check out this schematic from 'lectric Bob.
http://www.aeroelectric.com/PPS/Engine/Gaging/Oil P Warn.pdf
When the engine runs, no warning light, and the Hobbs counts the hours.
When the oil pressure drops to zero the oil pressure warning circuit is
closed and the oil pressure light/buzzer come on........as long as the
master switch is still on. Turn off the master, and the oil pressure
light/buzzer goes out. You could label the light "Oil Pressure / Master
ON".
Steve

mprather(at)spro.net
Guest

Posted: Thu Jan 05, 2006 6:07 pm Post subject: AeroElectric-List:



Brainstorming, not criticizing here..

If you are doing debug/maintenance work in the hangar, having the strobe

on would drive me a little batty (not to mention running the battery

down)..

An alternate/additional idea: add a cabin door/canopy switch, and a little

combinatorial switching logic.. When the cabin door is closed, AND the

master is on, the strobe is enabled. That way, if you leave the door open

while you are working on the plane, you can have the master turned on, but

not be annoyed by the strobe. Close the door to walk away from the

airplane after forgetting to turn the master off, and the strobe turns on

Disadvantages of using the strobe connected to the master switch: Some

aviators find it offensive when other aviators operate their strobes at

night while on the ground. That might suggest that you install a defeat

switch. And that means that you may forget to un-defeat it, and leave the

master turned on, and kill the battery... A latching defeat switch,

maybe? Cycling the master switch resets the defeat. Okay, too complex?

If your airplane is equipped with LED position lights, maybe these could

be illuminated instead, as they are low enough draw, and aren't very

annoying to be around.

Regards,

Matt-

<skywagon(at)charter.net>

Bob,

What I would suggest..... if you have a rudder tip strobe or similar,

leave it on all the time. If you step out of the bird and forget the

master, usually the strobe blinking away will get your attention before

you leave and remind you of the Master left on.

David

nuckollsr(at)cox.net
Guest

Posted: Thu Jan 05, 2006 6:34 pm Post subject: AeroElectric-List:

`At 06:43 PM 1/5/2006 -0600, you wrote: Hi all, I have been thinking an ''idiot light'' to tell me when the master is left on would be handy.`

been selling those for years . . . see:
http://aeroelectric.com/Catalog/AEC/9005/9005.html
or build your own:
http://aeroelectric.com/articles/lvwarn/9021-620.pdf
http://aeroelectric.com/articles/lvwarn/LVWarn-ABMM.html
It has the added advantage of being active notification
of alternator being off line either due to failure or
having been shut off. that's what I call multi-tasking.
Bob . . .

Fiveonepw(at)aol.com
Guest

Posted: Thu Jan 05, 2006 7:12 pm Post subject: AeroElectric-List:



In a message dated 01/05/2006 6:52:07 PM Central Standard Time,

icubob(at)newnorth.net writes:

I have been thinking an ''idiot light'' to tell me when the master is left on

would be handy.

 	  Quote: 	
		  >>

	


Hi Bob-

I put one of these fwf wired to NC contacts on my oil pressure switch- master

has never been left on and it sure gets folks attention around the airplane

(like at a fly in b'fast) when ya hit the master switch...

http://mpja.com/productview.asp?product=12722+SU

 	  Quote: 	
		  From The PossumWorks in TN

Mark Phillips

jschroeder(at)perigee.net
Guest

Posted: Thu Jan 05, 2006 7:15 pm Post subject: AeroElectric-List:



Steve -

That's the way we did it. Works great. We did not wire up the buzzer,

however.

John

do not archive

On Thu, 05 Jan 2006 17:33:37 -0800, Steve Allison <stevea(at)svpal.org> wrote:

 	  Quote: 	
		   If you have an oil pressure switch to activate a Hobbs (hour meter),

check out this schematic from 'lectric Bob.

http://www.aeroelectric.com/PPS/Engine/Gaging/Oil P Warn.pdf

When the engine runs, no warning light, and the Hobbs counts the hours.

When the oil pressure drops to zero the oil pressure warning circuit is

closed and the oil pressure light/buzzer come on........as long as the

master switch is still on. Turn off the master, and the oil pressure

light/buzzer goes out. You could label the light "Oil Pressure / Master

ON".

Steve

	


--

bdenton(at)bdenton.com
Guest

Posted: Fri Jan 06, 2006 5:15 am Post subject: AeroElectric-List:



This is taking on elements of the situation described in the old story

wherein NASA spent millions developing a ballpoint pen that would allow

astronauts to write while upside down, while the Russian cosmonauts simply

used pencils.

Here's a nice quick-and-dirty and cheap 2-step solution:

1. Add "Turn off Master" to checklist.

2. Follow checklist. Which you should be doing anyway.

craig(at)craigandjean.com
Guest

Posted: Fri Jan 06, 2006 4:52 pm Post subject: AeroElectric-List:



The NASA story is an urban myth. The truth is much more interesting:

http://www.snopes.com/business/genius/spacepen.asp

Interestingly enough this same legend came up on the Corvair aircraft list

last night.

-- Craig

nuckollsr(at)cox.net
Guest

Posted: Sat Jan 07, 2006 5:59 am Post subject: AeroElectric-List:

`At 05:52 PM 1/6/2006 -0700, you wrote: <craig(at)craigandjean.com> The NASA story is an urban myth. The truth is much more interesting: http://www.snopes.com/business/genius/spacepen.asp Interestingly enough this same legend came up on the Corvair aircraft list last night.`

Thanks for the link! I've seen this floating around
for a lot of years. The $10 millions seemed way out
of whack. I also recalled being able to buy the "Space
Pen" in office stores for fairly reasonable prices. Are
they still out there? Don't recall seeing one recently.
I've .pdf'ed the Snopes page for future reference.
Bob . . .

bob(at)bob-white.com
Guest

Posted: Sat Jan 07, 2006 7:02 am Post subject: AeroElectric-List:



On Sat, 07 Jan 2006 07:59:00 -0600

"Robert L. Nuckolls, III" <nuckollsr(at)cox.net> wrote:

craig(at)craigandjean.com
Guest

Posted: Sat Jan 07, 2006 2:29 pm Post subject: AeroElectric-List:



Keep a link to the Snopes site. It is very useful in checking stories like

this. And for a free site they are unbelievably thorough in their

investigations and reports.

-- Craig

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