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On May 13, 6:21*pm, Dan wrote:
wrote: I learned a great deal from this thread, especially all the references cited. Thanks to everyone for contributing. I think I may build the Jeff Shultz circuit, with 8 segments if bar LED, plus a red and yellow bar-like LED. However, I am not quite sure Shulz's logic of the lights is what I want. The display logic that makes sense to me is this: in cruise many green LED are lit *(could be 5-8), All greens at this point, no yellow or red lit. *These progressively go out as the nose is lifted. *Then the yellow comes on...with no greens lit then the red comes on. *I guess the yellow can stay on when the red is lit. might want to make the red flash. a job for a PIC? -Jeff * * If you make your own bar graph you can use a flashing red LED. Either that or use a yellow bar graph with separate flashing red LED. I think Radio Shaft carries them. I'd wire the yellow such that they remain lit as they climb until all are lit just before red illuminates. * *There are commercial systems available to the homebuilder. Look at their displays for ideas. If you find an array you like it shouldn't be too difficult to make one similar. * *I have the feeling no two people will agree on what's best. Dan, U.S. Air Force, retired The interest for me is a sailplane installation where AOA is a performance issue in addition to a safety issue. My glider can be flown at 1000 pounds up to 1433 pounds gross weight and spends a lot of time in 2G turns thermalling. The AOA for minimum sink is always the same but the airspeed at which that happens changes a lot. The same thing with best L/D. A very 'slippery' glider takes a while for the airspeed to settle down after a pitch change. Flying to an exact AOA would be easier than chasing airspeed. An AOA indicator that shows minimum sink and maximum L/D as well as stall would be quite useful. |
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