23,917\'">

Misha Borisov

The track log
here.

His climb rate averaged 1202.6 fpm as he flew straight climbing from 15256 to
17969 (GPS altitudes). His maximum instantaneous climb rate was 3346.5 fpm, but
not until a bit later. He climbed from 10,492' (GPS altitude) to 23,917' in
18:13 minutes.

His maximum ground speed, not quite down wind, was 75 mph. His total airspeed at
that point was 67 mph. He was at 21,000'. He was flying straight.

After hitting his maximum altitude he found strong sink and turned in it. His
maximum sink rate was 3346.5 fpm (seems like an unlikely coincidence, 17.00022 m/s).

He kept turning in sink until he got down to 20,305' then headed
away from where he was climbing.