....And it's not even officially winter yet...

OK, I understand about correcting the transducer based altitude,
corrected for ISA, so I guess you're using your static and OAT inputs to
calculate altitude before calculating and displaying the rate of change.

So am I to understand, then, that my mechanical vario is displaying
*indicated* rate of lift/sink while my electronic vario is displaying
*true* rate of lift/sink? I guess I'll take a close look on my next
wave flight.

On 12/7/2014 12:03 PM, Dave Nadler wrote:
On Sunday, December 7, 2014 1:56:25 PM UTC-5, wrote:
Looking at my decade old code for a transducer based variometer,
I see that I went to a bit of trouble to convert pressure to ISA
altitude before differentiating to get rate of climb.

Good, but its much easier just to correct by one_over_sigma ;-)

For even more amusement, consider the relationships between
"altitude corrected" rate of climb, IAS, TAS, calculated total
energy compensation, and speed to fly...

Right, proper instruments consider MC as a 'true' input as
well as correcting vario, IAS-TAS, and of course polar.

Discuss amongst yourselves ;-)


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Dan Marotta