Sharing a thermal

Won't SeeYou underestimate the thermalling speed because it is
calculating speed based on the straightline distance between different
points on a circle?


Andy Blackburn wrote:
Actual SeeYou measurements

ASW-27B dry (8.2 lbs/sf)
Altitude 13,000 ft
TAS/IAS: 71/53 mph
Measured radius: ~350 ft
Implied bank angle: 43.5 degrees
Stall speed (calculated): ~51 mph

ASW-27B wet (11.5 lbs/sf) -- prior day
Altitude 13,500 ft
TAS/IAS: 84/61 mph
Measured radius: ~515 ft
Implied bank angle: 42.5 degrees
Stall speed (calculated): ~57 mph

9B

Greg Arnold wrote in message news:0imdd.50323$hj.44614@fed1read07...
Won't SeeYou underestimate the thermalling speed because it is
calculating speed based on the straightline distance between different
points on a circle?

I was unable to duplicate SeeYou's calculations of thermaling speed. I
tried straight line between two points, fitting a circle through three
points, and calculating circumference based on a rough diameter.

I was trying to reconcile indicated airspeed I recalled from the
flight with SeeYou's numbers. But even after correcting for true
airspeed, I was still off. I finally gave up. Does anyone know how
SeeYou calculates speed in a thermal?

Chip Bearden
ASW 24 "JB"

Dnia 10/20/04 5:16 PM, U¿ytkownik Chip Bearden napisa³:

I was trying to reconcile indicated airspeed I recalled from the
flight with SeeYou's numbers. But even after correcting for true
airspeed, I was still off. I finally gave up. Does anyone know how
SeeYou calculates speed in a thermal?
Ground speed (as well as vertival speed) is an average calculated with a
few last readings. Check Options-Flight menu and values named "ground
speed filter" and "vertical speed filter".

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