{"id":1327,"date":"2015-07-02T02:31:11","date_gmt":"2015-07-02T00:31:11","guid":{"rendered":"http:\/\/www.urheiluilmailu.com\/?page_id=1327"},"modified":"2015-07-02T02:31:11","modified_gmt":"2015-07-02T00:31:11","slug":"lentoonlahto-ja-laskupaikat","status":"publish","type":"page","link":"https:\/\/www.urheiluilmailu.com\/?page_id=1327","title":{"rendered":"Lentoonl\u00e4ht\u00f6- ja laskupaikat"},"content":{"rendered":"

\"\"<\/a>Lennett\u00e4ess\u00e4 kaksitahtimoottorilla tulee turvallinen laskupaikka olla aina liitomatkan p\u00e4\u00e4ss\u00e4. Vaikka moottoroiduissa riippuliitimiss\u00e4 k\u00e4ytetty Radne on suhteellisen luotettava, ei omaa turvallisuutta kannata laittaa moottorin varaan.<\/p>\n

Hitaan lentonopeutensa ansiosta moottoroitu liidin ei v\u00e4ltt\u00e4m\u00e4tt\u00e4 tarvitse lentokentt\u00e4\u00e4 lentoonl\u00e4ht\u00f6- tai laskupaikaksi, vaikka usein se onkin helpoin ja turvallisin valinta. Laskeutumiset onnistuvat tarvittaessa my\u00f6s pelloille, tienp\u00e4tkille tai muille vastaaville, avoimille paikoille. Lentoonl\u00e4hd\u00f6ss\u00e4 liidin tarvitsee enemm\u00e4n vapaata tilaa ymp\u00e4rill\u00e4\u00e4n, 1-2 m\/s nousunopeutensa vuoksi. My\u00f6t\u00e4tuuleen<\/p>\n

\"\"<\/a><\/p>\n

Lentoonl\u00e4ht\u00f6- ja laskupaikan valinnassa on muutamia kriteerej\u00e4, jotka tulee ottaa huomioon. Paikan suunta vallitsevaan tuuleen n\u00e4hden on ensimm\u00e4inen valintakriteeri. Kaikki laskeutumiset ja lentoonl\u00e4hd\u00f6t suoritetaan aina vastatuuleen. My\u00f6t\u00e4tuuleen k\u00e4\u00e4ntyminen liian matalalla lentoonl\u00e4hd\u00f6n j\u00e4lkeen johtaa ongelmiin. Mik\u00e4li paikka ei salli turvallista lentoonl\u00e4ht\u00f6\u00e4 ja laskeutumista vastatuuleen, tulee valita toinen. Tuulen suunnan voi p\u00e4\u00e4tell\u00e4 esimerkiksi veden liikkeist\u00e4, puista, savuista, lipuista ja viireist\u00e4, mik\u00e4 nyt ylip\u00e4\u00e4ns\u00e4 tuulessa liikkuu. Ja voihan sinne kent\u00e4lle vied\u00e4 oman tuulipussin tai viirin. Laskupaikkaa valitessa\u00a0lent\u00e4j\u00e4n tuoreessa muistissa on viel\u00e4 varmasti suunta, johon alunperin lentoon l\u00e4hdettiin, olkoonkin ett\u00e4 tuulen suunta voi v\u00e4h\u00e4n vaihdella.<\/p>\n

(Kuvat ovat Joutsenon lennokkikent\u00e4lt\u00e4. Kentt\u00e4 on peltojen v\u00e4liss\u00e4 oleva, tasaista ruohoa kasvava pienehk\u00f6 kentt\u00e4, jonne laskeutuminen ja lentoonl\u00e4ht\u00f6 oli varsin mukavaa. Ja olenpa joskus tuolta tielt\u00e4kin l\u00e4htenyt lentoon.. \ud83d\ude09 )<\/em><\/p>\n

\"\"<\/p>\n

Peltojen halki kulkee usein s\u00e4hk\u00f6linjoja. Niiden ohella pellot voivat olla miinoitettuja\u00a0s\u00e4hk\u00f6paimenilla ja muilla vastaavilla esteill\u00e4. N\u00e4m\u00e4 tulee huomioida hyviss\u00e4 ajoin ennen laskeutumista tai lentoonl\u00e4ht\u00f6\u00e4. Mik\u00e4li paikka viett\u00e4\u00e4 johonkin suuntaan, ei se ole my\u00f6sk\u00e4\u00e4n hyv\u00e4 valinta. Alam\u00e4keen laskeutuminen johtaa varmaan rypemiseen.<\/p>\n

Laskupaikan pinnalla on suorituksen onnistumisen kannalta my\u00f6s suuri merkitys. Liidin ja lent\u00e4j\u00e4 hyytyv\u00e4t pitk\u00e4\u00e4n heinikkoon. Vaikka lent\u00e4j\u00e4 jaksaisi siin\u00e4 juosta, moottoroidun riippuliitimen py\u00f6r\u00e4t tai jalakset tarttuvat heinikkoon kiinni. Ep\u00e4tasainen pinta, kuten kynn\u00f6spelto, vaikuttaa aika lailla samalla tavalla. Paitsi ett\u00e4 siin\u00e4 juokseminen on ik\u00e4v\u00e4\u00e4, ovat nilkan nyrj\u00e4hdys ja muut vastaavat varsin todenn\u00e4k\u00f6isi\u00e4. Todenn\u00e4k\u00f6isesti Mosquiton kaltaiset laitteet viel\u00e4 kaatuvat t\u00e4llaisessa menossa kyljelleen, s\u00e4rkien potkurin.<\/p>\n

\"\"<\/a><\/p>\n

Talvisin j\u00e4rven j\u00e4\u00e4 on erinomainen paikka toimia. J\u00e4rven j\u00e4\u00e4ll\u00e4 oleva v\u00e4h\u00e4luminen, ehk\u00e4 aurattu tasainen alue kuten tienp\u00e4tk\u00e4, mahdollistaa toimimisen. Suuri aukea alue toimii mahtavana laskeutumispaikkana joka suuntaan, olettaen ett\u00e4 lunta ei ole perhekalleuksiin asti. J\u00e4\u00e4lle p\u00e4\u00e4see tuuli puhaltamaan esteett\u00e4, turbulenssia harvemmin on.<\/p>\n

Veteen laskeutuminen on kaikista riskialttein toimenpide ja sit\u00e4 tulisi v\u00e4ltt\u00e4\u00e4. Paitsi ett\u00e4 v\u00e4lineet kastuvat, voi lent\u00e4j\u00e4 vaihtaa toimituksessa hiippakuntaa. Laitteisto painaa kaikkiaan 60-70 kg. Lent\u00e4j\u00e4 on n\u00e4iss\u00e4 eritt\u00e4in hyvin kiinni. Veteen laskeutuessa valjaiden ja moottorin paino painaa lent\u00e4j\u00e4n pinnan alle ja 30 kg painava, 10 metri\u00e4 k\u00e4rkiv\u00e4lilt\u00e4\u00e4n oleva liidin l\u00e4ss\u00e4ht\u00e4\u00e4 viel\u00e4 lent\u00e4j\u00e4n p\u00e4\u00e4lle. Valjaista ja laitteesta irtautuminen on hankalaa, k\u00e4yt\u00e4nn\u00f6ss\u00e4 mahdotonta ja seuraukset kohtalokkaat. Veteen laskeutumista on testattu valvotuissa olosuhteissa, ilman apua yli puolet yritt\u00e4jist\u00e4 olisi hukkunut.<\/p>\n

Oli lentoonl\u00e4ht\u00f6- tai laskupaikka mik\u00e4 tahansa, tulee erityist\u00e4 huomiota kiinnitt\u00e4\u00e4 reunaesteisiin. Reunaesteet paitsi fyysisell\u00e4 olemassaolollaan rajoittavat lentoonl\u00e4ht\u00f6\u00e4 ja laskeutumista, ne aiheuttavat my\u00f6s ik\u00e4v\u00e4\u00e4 turbulenssia kent\u00e4n pintaan. Mit\u00e4 kovempi tuuli, sit\u00e4 enemm\u00e4n. Reunaesteiden aiheuttaman turbulenssin vaikutusalue on noin kymmenen kertaa reunaesteen korkeus, varsin pitk\u00e4 matka siis. Lentoonl\u00e4hd\u00f6t ja laskeutumiset t\u00e4h\u00e4n turbulenssiin eiv\u00e4t ole turvallisia.<\/p>\n

English: Places suitable for operation with powered hang-gliders<\/h1>\n

 <\/p>\n

\"\"<\/a><\/p>\n

When flying a two-stroke powered aircraft, the pilot must keep a safe landing site at the distance of the glide range. Although the Radne engine used in powered hang gliders is quite reliable, it is not wise to put your safety on the engine. Thanks to its slow speed the powered gliders do not need an airfield for take-off and landing, although it is often the easiest and safest choice. The powered glider can be landed on a fields and other open sites, even a road can be a landing site in an emergency. The take-off requires more free space due to the slow climb speed of 1-2 m\/s.<\/p>\n

\"\"<\/a><\/p>\n

There are few critera that must be taken account when choosing a site. The first one of the criteria is the position and direction of the site. All landings and take-offs are performed in headwind. After take-off the glider has to be flown to the headwind as long as a safe altitude is reached. Turning around in the tailwind at low altitude in case of engine problems is extremely dangerous and will lead to problems. The pilot must be able to perform the engine-out emergency landing in a direction of take-off without turning around. This principle applies all powered aircraft, not alone powered hang gliders. If the flying site does not allow this, it is not suitable for operation.<\/p>\n

When approaching the landing site, ind conditions can be evaluated by looking at waves on lake, waving trees, smokes from the chimneys, waving flagc and so on. Using a windsock is highly recommended. And when choosing a landing site, the pilot surely remembers the direction of the take-off although the pilot must ensure that the direction of the wind has not changed during the flight.<\/p>\n

\"\"<\/p>\n

(The photos in this article are taken at a small airstrip that is used by model aircraft hobbyists. It is a small grass field in the middle of open space that was very comfortable to land on and to take-off from. A while ago I also took off from the road next to it.. \ud83d\ude09
\nPower lines usually cross the fields and electric fences for the cattle are usually present. These nasty electric surprises must be taken into account a well before landing or take-off. If the planned site seems to be too electrified to taste, one must pick another one. So the evaluation of the site must be done at an altitude which allows the pilot to select another, better landing site. Also if the planned landing site seems to be sloped, it would be wise to reconsider, since landing to a downhill will result in a sure faceplant.<\/p>\n

\"\"<\/a><\/p>\n

The surface qualities of the site also affect to the performance. The glider and the pilot will stuck in long grass or snow. Even if the pilot could have endurance to run in it, the wheels or skids of the power unit will struggle in it causing heavy drag. Uneven surface has similar effects. The running is not comfortable on uneven surface and risk of injuries is high. And power units like Mosquito may fall to their sides when running on a very rough surface, destroying the propeller in the process.<\/p>\n

During winter, frozen lake beds make excellent sites for powered hang glider operation. Area with lesser snow, such as a ice road, will make flying possible. Large open space is an excellent place for take-offs and landings, in every direction if there is no knee-deep snow. On the ice the wind is usually very smooth since it can blow without obstructions which normally cause turbulence. However, when operating on frozen lakebeds, pilot must avoid weak ice and open water at all costs, since landing on freezing cold water in the middle of nowhere with all this equipment on will have fatal consequences. Landing on a water is absolutely the worst thing that one can do with a powered hang glider. Not only the equipment gets wet, the survival of the pilot is highly unlikely. The equipment which is firmly strapped to the pilot weighs 60-70 kilograms. The weight of the harness and power unit will drag the pilot down and the glider which has a wingspan of 10 meters and weight of 30 kg, lands on the pilot, making escape attepts difficult to impossible. As the equipment is designed to keep the pilot as a very firmly in place as a part of the aircraft, separating from it under water is extremely difficult. Under controlled circumstances with divers the water landing and separation from the glider has been tried, with devastating results. Without help, over half of the pilots trying the water landing, would have been drowned.<\/p>\n

Whatever the site, the obstacles such as treeline surrounding the site must be taken into consideration since they create turbulence. The turbulence created by them makes landings and take-offs difficult or even dangerous. The effective range of the turbulence is said to be ten times of the height of the obstacle. Landings and take-offs in this turbulent area are not safe.<\/p>\n","protected":false},"excerpt":{"rendered":"

Lennett\u00e4ess\u00e4 kaksitahtimoottorilla tulee turvallinen laskupaikka olla aina liitomatkan p\u00e4\u00e4ss\u00e4. Vaikka moottoroiduissa riippuliitimiss\u00e4 k\u00e4ytetty Radne on suhteellisen luotettava, ei omaa turvallisuutta kannata laittaa moottorin varaan. Hitaan lentonopeutensa ansiosta moottoroitu liidin ei v\u00e4ltt\u00e4m\u00e4tt\u00e4 tarvitse lentokentt\u00e4\u00e4 lentoonl\u00e4ht\u00f6- tai laskupaikaksi, vaikka usein se onkin … Continued<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":650,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/pages\/1327"}],"collection":[{"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1327"}],"version-history":[{"count":1,"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/pages\/1327\/revisions"}],"predecessor-version":[{"id":1328,"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/pages\/1327\/revisions\/1328"}],"up":[{"embeddable":true,"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=\/wp\/v2\/pages\/650"}],"wp:attachment":[{"href":"https:\/\/www.urheiluilmailu.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}