XXVI OSTIV Congress
6 - 13 August 1999
Papers presented within the Meteorology Session
Summarized by Hermann Trimmel
- Joachim KUETTNER: 2000km straight; How to do it?
- You should know there is a OSTIV-Award "Dr. Joachim Kuettner - 2000km - Price and Trophy".
This Award consits of
No claim for this Award has been received yet!
- the PRICE for the first 2000km straight line distance soaring flight, given only once
to the sailplane pilot(s) who first accomplish(es) a stright-line distance flight soaring 2000 km
or more. It is a MONEY AWARD of US $ 3000.
- the TROPHY is a styled sailplane model with engraved name(s) and flight data. The flight
must fullfill the regulations of the FAI Sporting Code. No differences will be made between
classes of gliders.
If the reason is not knowing how to do it, Joachim himself anaylzed the flight techniques
as well as the meteorological and geographical requirements for such a flight. Will it
be possible in Europe from the Pyrenees-Alps-Riesengebirge-Poland, along the Ural-mountainridge,
in China from Urumqui to Xian, in South America along the Cordilleres and downwind to northeast,
or in the USA across the Rockies to Kansas City? Perhaps some of you remember Kuettners
historical flight in the early fifties, when he did 600 km in just 4 hours ...!
- Michael John HANCY: Soaring climatology of Gawler / South Australia
- Do you expect updrafts on a final glide over a river - as you can have over the
River Murray? Whenever you want to fly in that area you should read this paper frome Mike
Hancy, meteorologist from Adelaide. He presented basic climatological statistics of temperature,
rainfall and winds, so you can choose the best period of flying in the Gawler task area.
Synoptic features such as cold fronts, Rossby Waves and North-West Cloud Bands are described.
In relation to these elements, the more pertinent topics relevant to gliding were presented.
These include convection, seabreezes, microbursts and dust devils. Finally SW to SE situations
are described which are commonly associated with inversion waves (cycling) and wave-thermal
- Wm. C. FELDBAUMER: Total Elapsed Time Scoring for Sailplane Races
- Dr. Wm.C. Feldbaumer, a retired Professor of Management, competed in 10 US Nationals
and many Regionals, unfortunaltely could not personally present his paper, so it was given
brively by Mark Maughmer.
Unlike other sports, the soaring community has not yet standardized on one system for
scoring it's races. This indicates a need for a scoring system analysis and design effort
to determine the most accurate system for scoring each pilot's performance. The analysis
in this paper shows that using the measured perfomance of each pilot - elapsed time -
as his daily score yields the highest accuray. The system selects as champion the pilot
whith the lowest total elapsed time for the entire contest. He is the pilot who flies the
total distance of the contest at the highest speed. It is recommended that organizations which
sponsor sailplanes races to use Total Elapsed Time scoring if their objective is to score as
accurately as possible. It has been shown that 1000-point scoring systems do not accurately
score the measured performance of the pilots in sailplane races.
The author (Wm.C. Feldbaumler, 70 Militia Hill, Warrington, PA 18976, USA,
email@example.com) would be happy to receive comments and
questions about his proposal.
- Reto SPAAR, Olivier LICHTI and Bruno BRUDERER: Forecasting flight altitudes and soaring performance of migrating raptors by the profile of atmospheric conditions?
- Reto Spaar, an ornithologe from Switzerland observed the flight strategies of different
species of birds as eagles, falcons and buzzards. The flight behaviour of the larger species
minimize energy consumption by using only suitable thermal updrafts. They also maximize their
cross country speed by flying conservative in good conditions. The small raptors adopted
a mixed strategy: they minimize enery consumption when thermal activity is suitable and
additionally they minimize time consumption per distance by flapping flight. They always
have better glide ratios than they should have by theory.
- Wolf-Dieter HEROLD and Joachim KUETTTNER: Motor glider measurements of thermal waves and orographic flow pheomena in Colorado
- The authors did investigations on thermal waves with a Stemme S10 over the great plains. Thermal waves
are gravity waves which need a convective layer below (clouds act as obstacles) and a windshear
above. These waves are more frequent than most pilots expect and sometimes you can reach very
high altitudes. If it is blue, these moving waves are not easy to find, so you must have
a good picture of the atmosheric motion.
- Carsten LINDEMANN: Some experiments on lee waves near smaller mountains
- Carsten Lindemann showed us flight tracks of wave flights over the Harz and the Mittelgebirge,
Germany. Can you belive that a "mountain" of 300 m height can produce waves up to 7900m!?
In this case the windspeed and the stability of the atmosphere must be optimal. If the wind
speed is to high, generally the wave conditions get worses.
- Ahmet TOGÖZLÜ, M. ALTUNC, Carsten LINDEMANN, Zafar ASLAN and H. GÖYMEN: Analysis of atmospheric boundary layer and lake-land interaction
- On behalf of Zafar Aslan, a Turkish female meteorologist, who could unfortunately not come
to Bayreuth, Carsten Lindemann presented her paper about analysis of atmospheric boundary
layer and lake-land interactions.
- Herbert LEYKAUF and Ralf THEHOS: Forecasting of lee waves over complex terrain by means of a non-hydrostatic forecast model
- Herbert Leykauf, Chief of the Aviation meteorological department of the German weather
service (DWD) is an excellent pilot and owner of a ASW-22BLE. So he is very interested
to evaluate the products of his office himself. He compared the wave patterns over the
Aosta valley with the new fine-mesh non-hydrostatic model (LM) of the DWD during the last
spring. He presented excellent and encouraging results. In two years we can hope to get
this products via the PC_MET product of the DWD. Thank for Herbert for supporting our
sport in this way!
- Jozsef GEDEON: Turbulence Scale Parameter and Spectrum Identification
- This paper was presented by Hermann Trimmel.
A correct and complete analysis of the air flow is required for atmospheric
turbulence modelling as well as for increasing the performance of sailplanes or other
kinds of aircrafts.
- Joachim KUETTNER: Scientific soaring adventures 2
... or how stupid behaviour sometimes ends in new findings ...
- Did you have listened to "Adventures 1" by Joachim Kuettner in St. Auban, two years ago?
If not, than you really missed something special.
Now he continued with the second part. If you were not able to listen to his
stories you missed a fascinating highlight again. Sorry for you, because highlights
like this are unique and unforgetable.