---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Sat 09/06/08: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:25 PM - Stall Warning System for the Allegro 2000 () ________________________________ Message 1 _____________________________________ Time: 06:25:58 PM PST US From: Subject: Allegro-List: Stall Warning System for the Allegro 2000 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message allegro-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Allegro-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/allegro-list Browse Digests http://www.matronics.com/digest/allegro-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.