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Wanted: cheap audio vario
On Sep 2, 11:31*am, Martin Gregorie
wrote: .. You had to manually put the final glide distance and wind in on toggle switches because it had no GPS link, though in fairness it probably predates GPS. Once the final glide details were entered entered, it counted distance etc down on dead reckoning. Yes, the MNAV was hot stuff long before GPS and when the alternative was a prayer wheel. I used one in my 19 for years. The MNAV was not dead reckoning though, it decremented glide distance based on integrated airspeed, offset by a pilot entered wind estimate. Repeated fixes allowed the wind estimate to be refined as the glide progressed. When GPS came available the final glide distance could be manually set from the GPS rather than taking fixes off the chart which made things much easier and gave a quicker final glide wind solution. Integrated glide computers with GPS and moving maps make flying a whole different game from those days. Andy |
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