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Stall Warning System for the Allegro 2000

 
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hgmckay



Joined: 23 May 2006
Posts: 385

PostPosted: Sat Sep 06, 2008 5:25 pm    Post subject: Stall Warning System for the Allegro 2000 Reply with quote

I have a Fantasy Air, Allegro 2000 E-LSA which has most of the stall warning
system (proper ASI, pressure switch, all the pneumatic tubing) installed,
but not all of it. When I ordered the plane (Quick-Build Kit) I ordered the
entire stall warning system, but never received the electronic circuit
board, with LED, audible buzzers, etc. My ASI is the correct type that
interfaces (pneumatically and electrically) with the rest of the system, and
is properly installed and connected, but I cannot finish the system without
the electronic circuit board. I have been unsuccessful in getting the
circuit board from the US Distributor, so I found another Allegro builder
who ordered the same system, and he sent me detail photographs of the
circuit board that came from the manufacturer. From that information we have
built a similar circuit board with LED, resistor, and buzzers, and connected
it to the rest of the system based on the little to no information we had in
the assembly manual.



We have made two test flights with the "homemade system" and it worked, but
the Red LED and Buzzers stay on from the time you turn on the ignition key
until you near take off speed (aprx. 45 mph IAS), then they go off. This
doesn't seem to be correct. We did full flap stall tests at about 3000 feet
altitude by slowing the plane gradually with a nose high attitude, and the
plane stalled at aprx. 52 mph IAS, but the LED and Buzzers never came on.
Our normal landing speed is 65 mph IAS with full flaps. Evidently the system
requires adjusting some how, but I do not know how to adjust it since no
instructions or information was provided by the manufacturer or Distributor.
I notice that the ASI has a knob on it similar to an altimeter adjusting
knob. The knob has a brass wire loop through it so it can't be turned. I
don't know if this is factory set, or if it is to be adjusted in the field.
I have been told that this knob is for adjusting, or calibrating the stall
speed during test flights. I am in uncharted territory here, and at this
point am hoping that some of you that have the Allegro 2000 stall warning
system can help me. I first need to have some confirmation as to what the
knob on the ASI is for? Is it indeed for adjusting/calibrating the stall
speed? Has this already been done at the factory? If not, what is the
procedure for doing the calibration during flight? Second, the electrical
pressure switch that is connected to the pneumatic system has a very small
screw on it which appears to be another point of adjustment. Is this
pressure switch set at the factory, or does it require field adjustment. If
it requires field (in flight) adjustment, I don't see how that can be done
since it is mounted behind the instrument panel.



I would appreciate any and all the help you can give me as to how to
correctly connect this system, and the procedure to calibrate it.



Hugh McKay

Allegro 2000

Rotax 912 UL

N661WW


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ledson



Joined: 29 Apr 2009
Posts: 59

PostPosted: Thu Nov 18, 2010 1:19 pm    Post subject: Re: Stall Warning System for the Allegro 2000 Reply with quote

Hugh,

I search the entire Allegro Forum and couldn't find where there was an answer or solution to your problem with calibrating the stall warning system. did you ever get your problem solved?

Larry


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