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#11
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kirjoitti legroups.com... From the Czech news service. Headline: Brno pilots plan to fly around the world in glider BRNO (PDM staff with CTK) 12 July - A team of experts from the Brno-based Sport Aviation Association is preparing for the first ever flight around the world in a glider, association head Vladislav Zejda told CTK yesterday. Is this a newspiece? I found http://www.radio.cz/en/article/35215 which is from Dec.2002 http://archiv.radio.cz/php/parse.pht...14-12-02.xml#1 But in general, it would be nice to hear wether there are any thermals on the oceans? They are mentioned at least here http://www.antarcticconnection.com/a...lbatross.shtml "Albatrosses are supreme gliders; with modified wings to maximize the updrafts and thermals over the open ocean. Albatrosses are best observed during rough weather, when high waves create strong uplifting air currents, enabling them to remain aloft with hardly a wing beat for hours on end." And what would be the ideal heigth to soar over the ocean? Is it over 20km as Hana Zejdova said in the interview? Or is it so low over the water surface, that you (or the glider) can utilize vertical air movements caused by the water waves in the horizontal wind. Is it possible to soar above these air waves? And if it it impossible to glide over the ocean, could it be still possible to make a record how long man can soar from from west to east over land areas? And allow him to come down in the evenings for sleep and continue in the morning? It would be a famous and memorable air rally even that way, especially if it is flown as competition, and if it is possible to fly from Siberia to Alaska across Bering Sea Fancy imagination? -- Erkki Mikola |
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Erkki Mikola wrote:
kirjoitti legroups.com... From the Czech news service. Headline: Brno pilots plan to fly around the world in glider BRNO (PDM staff with CTK) 12 July - A team of experts from the Brno-based Sport Aviation Association is preparing for the first ever flight around the world in a glider, association head Vladislav Zejda told CTK yesterday. Is this a newspiece? I found http://www.radio.cz/en/article/35215 which is from Dec.2002 http://archiv.radio.cz/php/parse.pht...14-12-02.xml#1 But in general, it would be nice to hear wether there are any thermals on the oceans? They are mentioned at least here http://www.antarcticconnection.com/a...lbatross.shtml "Albatrosses are supreme gliders; with modified wings to maximize the updrafts and thermals over the open ocean. Albatrosses are best observed during rough weather, when high waves create strong uplifting air currents, enabling them to remain aloft with hardly a wing beat for hours on end." And what would be the ideal heigth to soar over the ocean? Is it over 20km as Hana Zejdova said in the interview? Or is it so low over the water surface, that you (or the glider) can utilize vertical air movements caused by the water waves in the horizontal wind. Is it possible to soar above these air waves? And if it it impossible to glide over the ocean, could it be still possible to make a record how long man can soar from from west to east over land areas? And allow him to come down in the evenings for sleep and continue in the morning? It would be a famous and memorable air rally even that way, especially if it is flown as competition, and if it is possible to fly from Siberia to Alaska across Bering Sea Fancy imagination? -- Erkki Mikola The upcurrents produced by waves are not thermals but literally wave effect as found over mountain ranges and which allow gliders to get to over 20 000ft. Albatrosses also use the wind gradient. The wind blows faster a little way above the wave compared to lower down and this can be utiliseed by trading ground speed for height while keeping airspeed constant, true soaring! |
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