SD Dojavi Slobodna Dalmacija
stdClass Object ( [id] => 1218935 [title] => Dilema kod kupnje glisera - okomiti ili zakošeni pramac? Okomiti je brži i bolje iskorištava prostor, zakošenim se lakše manevrira [alias] => dilema-kod-kupnje-glisera-okomiti-ili-zakoseni-pramac-okomiti-je-brzi-i-bolje-iskoristava-prostor-zakosenim-se-lakse-manevrira [catid] => 418 [published] => 1 [introtext] => [fulltext] =>

 

Poštovani, želim kupiti gliser od 10-ak metara, pri čemu se dvoumim između dviju koncepcija pramca. Naime, neki gliseri, kakvi su primjerice modeli norveškog brenda Fjord, imaju gotovo okomit pramac, poput sjekire, dok je kod većine drugih modela jako zakošen.

Osobno su mi draži gliseri s okomitim pramcem, ali bih želio znati koje su maritimne razlike između tih dviju koncepcija, odnosno pluseve i minuse za svaku od njih da ne pogriješim kod izbora? Filip L., Rijeka

Generalno, brodice s okomitim pramcem imaju dužu vodenu liniju, čime im se za koji kabel povećava i teoretska maksimalna brzina. Okomiti pramac ima i oštriji pramčani kut, dakle, stvara manji otpor i lakše se probije kroz val. Međutim, volumen na vrhu pramca je manji i lakše zaranja, čime mu je u nekim uvjetima amplituda posrtanja veća.

Ovisno o obliku podvodnog dijela krme, u manevru okreta može opisivati veći luk.

Plovidba niz val

Nije pravilo, ali većina ovakvih brodica u plovidbi niz val ima reakciju brodice s dugom kobilicom.

Pri određenim uvjetima krene za valom, odnosno, na trenutke ona vozi vas, a ne vi nju, što ponekad plovidbu zna činiti dosta zamornom, naročito kada kormilo drži autopilot.

Modeli sa zakošenim pramcem, opet generalno, imaju manje oštar pramčani kut, dakle, na vrhu pramca veći volumen, a što se pramac više podiže taj je volumen sve izraženiji. Takvi pramci manje zarone i teže probiju val, ali im je i amplituda posrtanja dosta manja.

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image

S kosim pramcem lakše se manevrira

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Dobrim omjerom trima brodice i brzine mogu se dosta umiriti. Kod manevra okreta čine manji luk i u plovidbi krmom lakše prihvate promjenu smjera, a u plovidbi niz val manje su nemirni.

U svom pitanju kao primjer u vašoj dilemi za brodice s okomitim pramcem, poput sjekire, navodite modele norveškog brodograditelja Fjord, a možda je za to pojasniti još bolje izraženo na domaćem modelu Colnago 40.

Istina, njihovi pramci jesu okomiti, međutim, samo u nadvodnom dijelu, ali im je podvodni dio isti kao i na brodicama s nakošenim pramcem.

Iskorišteni prostor

Dakle, ovdje okomiti pramac nimalo na utječe na njihove maritimne karakteristike. Njime se postiglo nešto drugo. U prvom redu su to jednostavnije linije i na pramcu bolje iskorišten prostor.

Novi dizajn daje im moderniji oblik, a ukoliko u plovidbi pramac i krene zaroniti dublje, ovim se volumenom postigao dosta veći uzgon.

Osim toga, ukupna dužina brodice je barem za desetak posto manja negoli da se na istom podvodnom dijelu izgradi plovilo s nakošenim pramcem. Ta se razlika kasnije manifestira i kroz troškove. Brodicom kraćom tek koji centimetar od dvanaest metara dobije se puni komfor manje jahte od 45 stopa, a i troškovi veza po marinama su manji.

Pitanja šaljite na e-mail more@slobodnadalmacija.hr.

 

 

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Čitajte sve o jedrenju, đitama po Jadranu, brodovima na struju, brodskim motorima i popravku broda. Učimo vas kako održavati brod. 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Okomiti pramac bolje iskorišava prostor

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S kosim pramcem lakše se manevrira

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Poštovani, želim kupiti gliser od 10-ak metara, pri čemu se dvoumim između dviju koncepcija pramca. Naime, neki gliseri, kakvi su primjerice modeli norveškog brenda Fjord, imaju gotovo okomit pramac, poput sjekire, dok je kod većine drugih modela jako zakošen.

Osobno su mi draži gliseri s okomitim pramcem, ali bih želio znati koje su maritimne razlike između tih dviju koncepcija, odnosno pluseve i minuse za svaku od njih da ne pogriješim kod izbora? Filip L., Rijeka

Generalno, brodice s okomitim pramcem imaju dužu vodenu liniju, čime im se za koji kabel povećava i teoretska maksimalna brzina. Okomiti pramac ima i oštriji pramčani kut, dakle, stvara manji otpor i lakše se probije kroz val. Međutim, volumen na vrhu pramca je manji i lakše zaranja, čime mu je u nekim uvjetima amplituda posrtanja veća.

Ovisno o obliku podvodnog dijela krme, u manevru okreta može opisivati veći luk.

Plovidba niz val

Nije pravilo, ali većina ovakvih brodica u plovidbi niz val ima reakciju brodice s dugom kobilicom.

Pri određenim uvjetima krene za valom, odnosno, na trenutke ona vozi vas, a ne vi nju, što ponekad plovidbu zna činiti dosta zamornom, naročito kada kormilo drži autopilot.

Modeli sa zakošenim pramcem, opet generalno, imaju manje oštar pramčani kut, dakle, na vrhu pramca veći volumen, a što se pramac više podiže taj je volumen sve izraženiji. Takvi pramci manje zarone i teže probiju val, ali im je i amplituda posrtanja dosta manja.

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image

S kosim pramcem lakše se manevrira

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Dobrim omjerom trima brodice i brzine mogu se dosta umiriti. Kod manevra okreta čine manji luk i u plovidbi krmom lakše prihvate promjenu smjera, a u plovidbi niz val manje su nemirni.

U svom pitanju kao primjer u vašoj dilemi za brodice s okomitim pramcem, poput sjekire, navodite modele norveškog brodograditelja Fjord, a možda je za to pojasniti još bolje izraženo na domaćem modelu Colnago 40.

Istina, njihovi pramci jesu okomiti, međutim, samo u nadvodnom dijelu, ali im je podvodni dio isti kao i na brodicama s nakošenim pramcem.

Iskorišteni prostor

Dakle, ovdje okomiti pramac nimalo na utječe na njihove maritimne karakteristike. Njime se postiglo nešto drugo. U prvom redu su to jednostavnije linije i na pramcu bolje iskorišten prostor.

Novi dizajn daje im moderniji oblik, a ukoliko u plovidbi pramac i krene zaroniti dublje, ovim se volumenom postigao dosta veći uzgon.

Osim toga, ukupna dužina brodice je barem za desetak posto manja negoli da se na istom podvodnom dijelu izgradi plovilo s nakošenim pramcem. Ta se razlika kasnije manifestira i kroz troškove. Brodicom kraćom tek koji centimetar od dvanaest metara dobije se puni komfor manje jahte od 45 stopa, a i troškovi veza po marinama su manji.

Pitanja šaljite na e-mail more@slobodnadalmacija.hr.

 

 

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Cropix
Cropix

Okomiti pramac bolje iskorišava prostor

S kosim pramcem lakše se manevrira
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StoryEditorOCM
Nautika

nautički savjetnikDilema kod kupnje glisera - okomiti ili zakošeni pramac? Okomiti je brži i bolje iskorištava prostor, zakošenim se lakše manevrira

Piše Damir Višić, sudski vještak za nautiku
25. kolovoza 2022. - 11:45
&lt;p&gt;Okomiti pramac bolje iskorišava prostor&lt;/p&gt;
Okomiti pramac bolje iskorišava prostorCropix

 

Poštovani, želim kupiti gliser od 10-ak metara, pri čemu se dvoumim između dviju koncepcija pramca. Naime, neki gliseri, kakvi su primjerice modeli norveškog brenda Fjord, imaju gotovo okomit pramac, poput sjekire, dok je kod većine drugih modela jako zakošen.

Osobno su mi draži gliseri s okomitim pramcem, ali bih želio znati koje su maritimne razlike između tih dviju koncepcija, odnosno pluseve i minuse za svaku od njih da ne pogriješim kod izbora? Filip L., Rijeka

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