Editing Dynamic soaring (section)

==Manned aircraft==
In his 1975 book ''Streckensegelflug'' (published in English in 1978 as ''Cross-Country Soaring'' by the [[Soaring Society of America]]), [[Helmut Reichmann]] describes a flight made by [[Ingo Renner]] in a [[Glasflügel H-301|Glasflügel H-301 Libelle]] [[Glider aircraft|glider]] over [[Tocumwal]] in Australia on 24 October 1974.  On that day there was no wind at the surface, but above an [[temperature inversion|inversion]] at 300 meters there was a strong wind of about 70&nbsp;km/h (40 [[knot (unit)|knots]]).  Renner took a tow up to about 350&nbsp;m from where he dived steeply downwind until he entered the still air; he then pulled a 180-degree turn (with high [[g-force|''g'']]) and climbed back up again.  On passing through the inversion he re-encountered the 70&nbsp;km/h wind, this time as a head-wind.  The additional air-speed that this provided enabled him to recover his original height.  By repeating this manoeuvre he successfully maintained his height for around 20 minutes without the existence of ascending air, although he was drifting rapidly downwind.  In later flights in a [[PIK-20 Tiu|Pik 20]] sailplane, he refined the technique so that he was able to eliminate the downwind drift and even make headway into the wind.