{"id":4653,"date":"2014-08-10T11:00:24","date_gmt":"2014-08-10T11:00:24","guid":{"rendered":"http:\/\/www.rc-tabor.com\/wordpress\/?p=4653"},"modified":"2014-08-04T05:50:56","modified_gmt":"2014-08-04T05:50:56","slug":"4653","status":"publish","type":"post","link":"https:\/\/www.rc-tabor.com\/wordpress\/?p=4653","title":{"rendered":"Maturitn\u00ed pr\u00e1ce \u2013 Jan Brich posedm\u00e9……."},"content":{"rendered":"

\"Honza<\/p>\n

Chov\u00e1n\u00ed vozu p\u0159i zm\u011bn\u011b pneumatik …<\/p>\n

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13. Chov\u00e1n\u00ed vozu p\u0159i zm\u011bn\u011b pneumatik<\/h2>\n

Pneumatiky jsou velmi d\u016fle\u017eit\u00fdm faktorem p\u0159i je\u017ed\u011bn\u00ed s modelem. P\u0159i z\u00e1vodech model\u016f jsou pneumatiky hlavn\u00edm kl\u00ed\u010dem k \u00fasp\u011bchu. P\u0159i testu jsem otestoval v\u0161echny \u010dty\u0159i druhy pneumatik popsan\u00fdch v bod\u011b [12.] a v\u00fdsledky byly mnohdy velmi p\u0159ekvapuj\u00edc\u00ed. I v tomto m\u011b\u0159en\u00ed je d\u016fle\u017eit\u00e9 zv\u00fdraznit extr\u00e9mn\u00ed v\u00fdchylky, kter\u00e9 mohou b\u00fdt je\u0161t\u011b v\u00fdrazn\u011bj\u0161\u00ed ne\u017e p\u0159i m\u011b\u0159en\u00ed svornosti diferenci\u00e1l\u016f. U pneumatik \u010dasto hraje velkou roli zah\u0159\u00e1t\u00ed pneumatiky na provozn\u00ed teplotu. S t\u00edmto aspektem se m\u016f\u017eete setkat nap\u0159\u00edklad u Formul\u00ed 1, kde je\u0161t\u011b p\u00e1r sekund p\u0159ed startem servisn\u00ed technici oh\u0159\u00edvaj\u00ed pneumatiky. P\u0159i proj\u00ed\u017ed\u011bn\u00ed zav\u00e1d\u011bc\u00edho kolo jezdci vyu\u017e\u00edvaj\u00ed trati a kli\u010dkuj\u00ed na trati, tak aby pneumatiky zah\u0159\u00e1li co nejl\u00e9pe. U takto mal\u00fdch model\u016f je tato hodnota zanedbateln\u00e1 a v m\u011b\u0159en\u00ed jsem s n\u00ed nepo\u010d\u00edtal.<\/p>\n

\"obr.43\"<\/p>\n

Obr.43<\/strong><\/p>\n

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I v tomto p\u0159\u00edpad\u011b jsem sestrojil graf, kter\u00fd ukazuje v\u00fdchylky v jednotliv\u00fdch pr\u016fjezdech testovac\u00edho \u00faseku.<\/p>\n

\"obr.44\"<\/p>\n

Obr.44<\/strong><\/p>\n

Jako nejhor\u0161\u00ed se uk\u00e1zaly pneumatiky Ripmax-led<\/strong>, kter\u00e9 se pou\u017e\u00edvaj\u00ed p\u0159edev\u0161\u00edm na sn\u011bhu a zledovat\u011bl\u00fdch cest\u00e1ch. Tyto pneumatiky d\u00edky m\u011bkk\u00e9 sm\u011bsi trp\u011bly velk\u00fdm opot\u0159eben\u00edm, \u0161patn\u011b dr\u017eely j\u00edzdn\u00ed stopu a v bodu m\u011b\u0159en\u00ed byl v\u016fz pr\u016fm\u011brn\u011b o 25cm d\u00e1l ne\u017e v z\u00e1kladn\u00edm nastaven\u00ed. Jako nejlep\u0161\u00ed v testu se uk\u00e1zaly pneumatiky slick<\/strong> pou\u017e\u00edvan\u00e9 p\u0159edev\u0161\u00edm v halov\u00fdch z\u00e1vodech, kde je \u010dist\u00fd povrch. Tato pneumatika vynikala nejlep\u0161\u00ed p\u0159ilnavost\u00ed, v bodu m\u011b\u0159en\u00ed pr\u016fm\u011brn\u011b o 30 cm l\u00e9pe ne\u017e z\u00e1kladn\u00ed nastaven\u00ed. U t\u00e9to pneumatiky se bohu\u017eel negativn\u011b projevovaly ne\u010distoty nasb\u00edran\u00e9 kolem trati, a proto tuto pneumatiku mohu doporu\u010dit pouze pro z\u00e1vodn\u00ed \u00fa\u010dely v hale, kde je povrch naprosto \u010dist\u00fd. Za nejlep\u0161\u00ed pneumatiky pova\u017euji ARP-\u0161oto<\/strong>, kter\u00e9 jezdily velmi p\u0159edv\u00eddateln\u011b, vyzna\u010dovaly se velmi konstantn\u00edmi pr\u016fjezdy a i p\u0159esto, \u017ee tato pneumatika je v\u00fdrobcem ur\u010dena pro pra\u0161n\u00e9 cesty mohu ji v\u0159ele doporu\u010dit pro asfalt. Nejv\u00edce jsem p\u0159ed testem vs\u00e1zel na pneumatiku zn\u00e1m\u00e9ho v\u00fdrobce pneumatik 1:1 Pirelli. Tuto pneumatiku bych ozna\u010dil za nejhor\u0161\u00ed. V testu se pneumatika chovala velmi nep\u0159edv\u00eddateln\u011b, zadn\u00ed \u010d\u00e1st vozu byla velmi neklidn\u00e1 a \u010dasto doch\u00e1zelo k p\u0159eto\u010den\u00ed zadn\u00ed \u010d\u00e1sti modelu.<\/p>\n

Pro p\u0159edstavu chov\u00e1n\u00ed pneumatik jsem za spolupr\u00e1ce s dobrovoln\u00edkem p\u0159ipravil kr\u00e1tk\u00e9 video, kter\u00e9 ukazuje chov\u00e1n\u00ed v\u0161ech \u010dty\u0159 pou\u017eit\u00fdch pneumatik.<\/p>\n

http:\/\/youtu.be\/S2ULjtzP960<\/div>\n

14. Chov\u00e1n\u00ed vozu p\u0159i zm\u011bn\u011b tuhosti vinut\u00fdch pru\u017ein<\/h2>\n

Bli\u017e\u0161\u00ed informace o tlumi\u010d\u00edch jsem popsal v bod\u011b [8.]. Pro spr\u00e1vn\u00e9 chov\u00e1n\u00ed modelu na asfaltov\u00e9m povrchu je velmi d\u016fle\u017eit\u00e1 volba pru\u017ein. Asfalt je velmi hladk\u00fd a rovn\u00fd povrch na rozd\u00edl od \u0161otoliny, kde je tra\u0165 velmi hrbolat\u00e1 a nerovn\u00e1. Z teorie v\u00edme, \u017ee \u010d\u00edm jsou pru\u017einy m\u011bk\u010d\u00ed, t\u00edm auto l\u00e9pe kop\u00edruje povrch. Na \u010desk\u00fdch silnic\u00edch toho m\u016f\u017eeme b\u00fdt sv\u011bdkem, kde na ka\u017ed\u00e9m kilometru je \u0159ada v\u00fdtluk\u016f od proj\u00ed\u017ed\u011bj\u00edc\u00edch aut. Autu takto m\u011bkk\u00e9 pru\u017einy zaru\u010duj\u00ed komfort na rovin\u00e1ch, ale p\u0159i pr\u016fjezdu zat\u00e1\u010dkou ve vy\u0161\u0161\u00ed rychlosti se automobil nep\u0159\u00edjemn\u011b nakl\u00e1n\u00ed a opisuje v\u011bt\u0161\u00ed dr\u00e1hu ne\u017e automobil s tvrd\u00fdmi pru\u017einami.<\/p>\n

\"obr.45\"<\/p>\n

Obr.45<\/strong><\/p>\n

Pro test jsem vyu\u017eil t\u0159\u00ed druh\u016f pru\u017ein. Pou\u017eil jsem modr\u00e9 tvrd\u00e9, st\u0159\u00edbrn\u00e9 (zlat\u00e9) st\u0159edn\u00ed a velmi m\u011bkk\u00e9 oran\u017eov\u00e9.<\/p>\n

\"obr.46\"<\/p>\n

Obr.46<\/strong><\/p>\n

U testovan\u00fdch pru\u017ein nesm\u00ed chyb\u011bt spojnicov\u00fd graf, kter\u00fd zn\u00e1zor\u0148uju jako u p\u0159ede\u0161l\u00fdch m\u011b\u0159en\u00ed projev p\u0159i pr\u016fjezdu zat\u00e1\u010dkou.<\/p>\n

\"obr.47\"<\/p>\n

Obr.47<\/strong><\/p>\n

V \u00favodu jsem popsal teoretick\u00e9 fungov\u00e1n\u00ed modelu za pou\u017eit\u00ed dan\u00fdch pru\u017ein. V praktick\u00e9m testu se prok\u00e1zalo, \u017ee tvrd\u00e9 pru\u017einy dosahuj\u00ed velmi dobr\u00fdch pr\u016fjezd\u016f zat\u00e1\u010dkou, ale d\u00edky tomu, \u017ee podvozek byl velmi tvrd\u00fd, doch\u00e1zelo ke ztr\u00e1t\u011b p\u0159ilnavosti vnit\u0159n\u00ed n\u00e1pravy a n\u00e1sledn\u00e9mu odskakov\u00e1n\u00ed vozu. P\u0159esn\u00fdm opakem byly v testu m\u011bkk\u00e9 pru\u017einy. Pr\u016fjezd zat\u00e1\u010dkou s nimi byl pro testovac\u00edho jezdce komfortn\u00ed, ale vzhledem k vysok\u00e9 n\u00e1jezdov\u00e9 rychlosti modelu chyb\u011bla pot\u0159ebn\u00e9 stabilita pro zvl\u00e1dnut\u00ed zat\u00e1\u010dky. Toto nastaven\u00ed bych doporu\u010dil na trat\u011b s velmi hrbolat\u00fdm povrchem, kde je pot\u0159eba kop\u00edrovat rozbitou cestu. Nejlep\u0161\u00edch v\u00fdkon\u016f dosahovaly st\u0159edn\u00ed pru\u017einy, kter\u00e9 pro tento \u00fasek splnily sv\u00e9 p\u0159edpoklady. Tento test n\u00e1m uk\u00e1zal, \u017ee nejvhodn\u011bj\u0161\u00edmi pru\u017einami budou st\u0159edn\u00ed pru\u017einy, ale kdyby do\u0161lo ke zm\u011bn\u011b rychlosti na 40km\/h staly by se pravd\u011bpodobn\u011b nevhodn\u00fdmi, tak jako m\u011bkk\u00e9 pru\u017einy. Dal\u0161\u00edm faktorem by bylo nutn\u00e9 sn\u00ed\u017een\u00ed sv\u011btl\u00e9 v\u00fd\u0161ky, tak aby nedoch\u00e1zelo k velk\u00fdm n\u00e1klon\u016fm podvozku.<\/p>\n

S t\u0159et\u00edm testem p\u0159ich\u00e1z\u00ed i t\u0159et\u00ed video, kter\u00e9 ukazuje pr\u016fjezd v\u0161ech t\u0159\u00ed nastaven\u00ed najednou.<\/p>\n

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http:\/\/youtu.be\/oEOMvzABDuk<\/div>\n

15. Z\u00e1v\u011br<\/h2>\n

D\u00edky ro\u010dn\u00edkov\u00e9 pr\u00e1ci jsem l\u00e9pe poznal chov\u00e1n\u00ed sv\u00e9ho modelu na zpevn\u011bn\u00e9m povrchu. Vzhledem k n\u00e1ro\u010dnosti m\u011b\u0159en\u00ed a zaznamen\u00e1v\u00e1n\u00ed hodnot jsem pou\u017eil dv\u011b kamery GoPro Hero 2, kter\u00e9 jsem s pomocn\u00edkem um\u00edstil tak, aby byl dan\u00fd \u00fasek co nejl\u00e9pe sn\u00edm\u00e1n. Z nam\u011b\u0159en\u00fdch hodnot jsem vytvo\u0159il p\u0159ehledn\u00e9 videa a o rady jsem po\u017e\u00e1dal odborn\u00edka, kter\u00fd v tomto oboru m\u00e1 v\u00edce zku\u0161enost\u00ed, a byl ochoten mi poradit. V r\u00e1mci technick\u00e9 \u010d\u00e1sti jsem poznal \u0159adu \u0159e\u0161en\u00ed na automobilech 1:1, kter\u00e9 pro m\u011b byly doposud velkou nezn\u00e1mou. Ze stanoven\u00fdch c\u00edl\u016f se mi bohu\u017eel nepoda\u0159ilo vytvo\u0159it kompletn\u00ed 3D model zadn\u00ed n\u00e1pravy, jeliko\u017e jsem se zam\u011b\u0159il p\u0159edev\u0161\u00edm na testov\u00e1n\u00ed samotn\u00e9ho modelu. Na\u0161e \u0161kola vlastn\u00ed \u0159adu 3D tisk\u00e1ren na kter\u00fdch mi byla vytvo\u0159ena \u010d\u00e1st zadn\u00ed n\u00e1pravy. S touto mo\u017enost\u00ed jsem nepo\u010d\u00edtal a jsem velmi r\u00e1d, \u017ee jsem z\u00edskal \u0159adu zku\u0161enost\u00ed v tomto nov\u00e9m oboru. P\u0159i pr\u00e1ci jsem z\u00edskal \u0159adu nov\u00fdch poznatk\u016f a douf\u00e1m, \u017ee je do budoucna dok\u00e1\u017eu zu\u017eitkovat nejen u model\u016f. Tato pr\u00e1ce bude nad\u00e1le slou\u017eit za\u010d\u00ednaj\u00edc\u00edm jezdc\u016fm, kte\u0159\u00ed tak budou moci l\u00e9pe nastavit sv\u00e9 modely. V\u0161em bude dostupn\u00e1 na webov\u00fdch str\u00e1nk\u00e1ch RC T\u00e1bor www.rc-tabor.com<\/a>. Do budoucna se na danou pr\u00e1ci d\u00e1 nav\u00e1zat rozs\u00e1hlej\u0161\u00edm testov\u00e1n\u00edm podvozku, nap\u0159\u00edklad na nezpevn\u011bn\u00e9m povrchu.<\/p>\n

D\u011bkujeme za zaj\u00edmav\u00e9 po\u010dten\u00ed a p\u0159ejeme mnoho \u00fasp\u011bch\u016f v dal\u0161\u00edm studiu…<\/p>\n

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Chov\u00e1n\u00ed vozu p\u0159i zm\u011bn\u011b pneumatik …      <\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4653","post","type-post","status-publish","format-standard","hentry","category-ostatni"],"_links":{"self":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4653","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4653"}],"version-history":[{"count":0,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4653\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4653"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4653"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rc-tabor.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}