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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Fri Jan 11, 2008 7:34 am Post subject: Stall Warning System |
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Gentlemen:
While building my Allegro 2000 I never did get the electronic horn module
and LED that mounts on and behind the instrument panel. I received
everything else (pressure switch, special ASI, wing with pressure port, and
all the necessary pneumatic tubing). I installed all of this on the plane
hoping that I would eventually receive the electronic module. It never came.
The assembly manual from Fantasy Air only had a simple diagram of the device
(on page 127in my manual) showing how it is connected to the ASI and
pressure switch. No other information written or otherwise was given. I have
since been able to get some information As well as some photographs of this
item. It looks to be very simple, so I have decided to simply build one
myself and install it. The device consists of a 12V circuit board with 6
terminal connections, a two color (red/green) LED on lead wires that will go
to the point on the panel where the LED will be mounted, two buzzers, a SPDT
12V relay, and a 697 ohm resistor, all being connected electrically to the
special ASI and pneumatic pressure switch which is already installed in my
aircraft. If any of you have this system in your aircraft, can you describe
to me how your stall warning system actually works while on the ground and
in flight (i.e. the sequence of visual and audible events that occur as you
take off, land, approach stall speed, and when you reach stall speed? This
will help me understand the logic of the system. I have heard from one
person who has the system that his LED is red only, and not a two color
(green-red) LED. If there is anyone out there that has additional
information that would help me understand this system and how it works I
would deeply appreciate the input. I don't want to go to the effort to build
something that is not going to work.
Hugh McKay
Allegro 2000
912UL
N661WW
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aerosiam
Joined: 26 May 2008
Posts: 59
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| Posted: Mon May 26, 2008 9:59 am Post subject: Re: Stall Warning System |
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Hugh
My LED was red-green. It stopped working within a few hours. The red would come on with start up then change to green at take off speed. Red indicated a stall.
I think I sent you some photos a while back when I had my panel out. I can look for them again.
The system is a little quirky and sometimes sounds on the ground when taxying in a cross wind but it works well in the air and gives about 5 to 7 kts warning before the break.
Regards
Paul
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