I'm at a pretty high sampling rate - 2 seconds I think.
At least my circles look pretty round. I don't know
how SeeYou calculates ground speed, but it stands to
reason that if you only had, say, 2 samples per circle
that might lead to an error - unless SeeYou somehow
assumes a circle through the points (seems doubtful).

The answer is pretty consistent with the bank angles
I thought I was flying based on aligning the diagonal
screws securing my instruments.

9B

At 05:24 20 October 2004, Greg Arnold wrote:
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