Dok god je u granicama certifikata dobijenog na testiranjima, nije opasan, naravno uz pristojno trenirane pilote, ali to bi se valjda trebalo podrazumijevati... Ako je jaci, onda ili cekanje na hold lokaciji da se smanji, ili alternativni aerodrom gdje je bolja situacija...Peruzzi wrote: ↑13/02/2022 21:39 Ne znam jel imamo pokojeg pilota na forumu ali svejedno bih postavio jedno pitanje. Koliko je crosswind zapravo opasan za uzlijetanje i slijetanje?
Imao sam par nezgodnih iskustava kad sam mislio da ce se avion srusit pri slijetanju pa me zanima jel to bas tako opasno kako izgleda?
Avijacija (zrakoplovstvo ili vazduhoplovstvo)
- drndalo
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#901 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
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#902 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
- Edin H.
- Posts: 47029
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#903 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
https://youtu.be/vPQh1FrbOc0drndalo wrote: ↑18/02/2022 13:02Dok god je u granicama certifikata dobijenog na testiranjima, nije opasan, naravno uz pristojno trenirane pilote, ali to bi se valjda trebalo podrazumijevati... Ako je jaci, onda ili cekanje na hold lokaciji da se smanji, ili alternativni aerodrom gdje je bolja situacija...Peruzzi wrote: ↑13/02/2022 21:39 Ne znam jel imamo pokojeg pilota na forumu ali svejedno bih postavio jedno pitanje. Koliko je crosswind zapravo opasan za uzlijetanje i slijetanje?
Imao sam par nezgodnih iskustava kad sam mislio da ce se avion srusit pri slijetanju pa me zanima jel to bas tako opasno kako izgleda?
8 sati slijetanja danas na Heathrow-u, pa bujrum
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#904 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Ojoj bajo moj. Baš zeznuto izgleda.
Slijetao sam prije 2 godine u Londonu i Mančesteru po solidnom vremenu, bez oluje i bilo je čupavo. Vjerovatno je to za njih normalna stvar jer je često takvo slijetanje tamo, ali bilo je neugodno.
Za njih mi nije toliko čudno, za otok je to normalno donekle. Ali u austriji evo sigurno mjesec dana vjetar se ne smiruje. Svaki drugi dan upozorenje za vjetar i do 100km/h. Ne znam koji je to klinac, ali je baš nenormalno vrijeme. Pretpostavljam da je slijetanje i uzlijetanje u beču zadnjih mjesec dana sranje za putnike jer kad vjetar nosi i obara drvece, mogu mislit sta radi avionu na otovorenom.
Slijetao sam prije 2 godine u Londonu i Mančesteru po solidnom vremenu, bez oluje i bilo je čupavo. Vjerovatno je to za njih normalna stvar jer je često takvo slijetanje tamo, ali bilo je neugodno.
Za njih mi nije toliko čudno, za otok je to normalno donekle. Ali u austriji evo sigurno mjesec dana vjetar se ne smiruje. Svaki drugi dan upozorenje za vjetar i do 100km/h. Ne znam koji je to klinac, ali je baš nenormalno vrijeme. Pretpostavljam da je slijetanje i uzlijetanje u beču zadnjih mjesec dana sranje za putnike jer kad vjetar nosi i obara drvece, mogu mislit sta radi avionu na otovorenom.
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#906 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Danas namjeravam na Netflixu pogledati ovaj dokumentarac:
https://www.rottentomatoes.com/m/downfa ... nst_boeing
Je li ga neko već pogledao?
https://www.rottentomatoes.com/m/downfa ... nst_boeing
Je li ga neko već pogledao?
- deer_hunter
- Posts: 1012
- Joined: 28/09/2012 15:46
#907 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Odlican. Nevjerovatno je da nakon svega niko od glavonja u Boeing-u nije zavrsio u zatvoru.Seawolf wrote: ↑20/02/2022 08:55 Danas namjeravam na Netflixu pogledati ovaj dokumentarac:
https://www.rottentomatoes.com/m/downfa ... nst_boeing
Je li ga neko već pogledao?
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#908 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
@Bobi iz pilotske kabine
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#909 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
https://simpleflying.com/how-does-a-hyd ... gine-work/
Malo sam, surfala o transportu istog ( naravno, godinama se koristi kao gorivo svemirskih letjelica)
https://www.lr.org/en/insights/articles ... portation/
Dio o opasnostima korištenja istog je posebno važan i zanimljiv:
Many studies have been conducted evaluating specific physical aspects of different fuels and
comparing them to hydrogen. Those studies show that certain characteristics of hydrogen make it
safer as a fuel than kerosene, while other characteristics make it more dangerous.
Hydrogen Kerosene
Auto-ignition temperature ✓
Buoyancy ✓
Diffusivity ✓
Spill Hazard ✓
Burning time ✓
Lower Flammability limit ✓
Flammability range ✓
Leakage detection ✓
Leakage Avoidance ✓
Flame detection ✓
Minimum ignition energy ✓
For instance, the auto-ignition temperature of hydrogen is considerably higher than that of kerosene
(550 °C vs 220 °C), also hydrogen is about 14 times lighter than air, so if spilled it quickly diffuses and
the vapors rises and disperses, rather than accumulating at ground-level [17]. Since hydrogen is a gas
that is already present in the atmosphere, a spillage would not represent an environmental hazard in
the same way compared to a fossil fuel spill. The minimum ignition energy of hydrogen, however, is
considerably lower than that of other carbon-based fuels, therefore, a weaker spark can cause ignition.
Moreover, the flammability range is wider meaning the concentrations in the air required to have a fire
are wider for hydrogen (4-76%) than for kerosene (1.4-7.6%) [3]. On the other hand, the lower
flammability limit is higher for hydrogen than kerosene (4% vs 1.4%). This means that if the
concentration of kerosene in air is more than 1.4%, a fire can occur, however this number is 3 times
larger for hydrogen. The hydrogen flame is invisible, and the gas is odorless making it difficult to detect
leaks or to fight a hydrogen fire if it that cannot be seen. Since H2 is such a small molecule, leaking
through cracks or pores is a possibility if the tank is not properly insulated, and this is associated to a
higher risk due to the reasons outlined before, demonstrating that proper insulation is fundamental.
The architecture of aircraft would have to change considerably to adapt the larger tanks required for
hydrogen flight. New aircraft designs would be required and may allow ideas such as blended wing
body aircraft. This may produce some aerodynamic advantages, however a downside could be the
time involved in certification of radical new aircraft, along with potentially substantial costs to redesign
and certify new aircraft and operational infrastructure.
Ma ovo je preskupo za generalnu upotrebu.
@Seawolf
Malo sam, surfala o transportu istog ( naravno, godinama se koristi kao gorivo svemirskih letjelica)
https://www.lr.org/en/insights/articles ... portation/
Dio o opasnostima korištenja istog je posebno važan i zanimljiv:
Many studies have been conducted evaluating specific physical aspects of different fuels and
comparing them to hydrogen. Those studies show that certain characteristics of hydrogen make it
safer as a fuel than kerosene, while other characteristics make it more dangerous.
Hydrogen Kerosene
Auto-ignition temperature ✓
Buoyancy ✓
Diffusivity ✓
Spill Hazard ✓
Burning time ✓
Lower Flammability limit ✓
Flammability range ✓
Leakage detection ✓
Leakage Avoidance ✓
Flame detection ✓
Minimum ignition energy ✓
For instance, the auto-ignition temperature of hydrogen is considerably higher than that of kerosene
(550 °C vs 220 °C), also hydrogen is about 14 times lighter than air, so if spilled it quickly diffuses and
the vapors rises and disperses, rather than accumulating at ground-level [17]. Since hydrogen is a gas
that is already present in the atmosphere, a spillage would not represent an environmental hazard in
the same way compared to a fossil fuel spill. The minimum ignition energy of hydrogen, however, is
considerably lower than that of other carbon-based fuels, therefore, a weaker spark can cause ignition.
Moreover, the flammability range is wider meaning the concentrations in the air required to have a fire
are wider for hydrogen (4-76%) than for kerosene (1.4-7.6%) [3]. On the other hand, the lower
flammability limit is higher for hydrogen than kerosene (4% vs 1.4%). This means that if the
concentration of kerosene in air is more than 1.4%, a fire can occur, however this number is 3 times
larger for hydrogen. The hydrogen flame is invisible, and the gas is odorless making it difficult to detect
leaks or to fight a hydrogen fire if it that cannot be seen. Since H2 is such a small molecule, leaking
through cracks or pores is a possibility if the tank is not properly insulated, and this is associated to a
higher risk due to the reasons outlined before, demonstrating that proper insulation is fundamental.
The architecture of aircraft would have to change considerably to adapt the larger tanks required for
hydrogen flight. New aircraft designs would be required and may allow ideas such as blended wing
body aircraft. This may produce some aerodynamic advantages, however a downside could be the
time involved in certification of radical new aircraft, along with potentially substantial costs to redesign
and certify new aircraft and operational infrastructure.
Ma ovo je preskupo za generalnu upotrebu.
@Seawolf
- Edin H.
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- drndalo
- Posts: 22820
- Joined: 26/06/2006 16:34
- Location: Sarajevo
#911 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Namjenski pravljen za specijalne terete...
- Toto
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#912 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
svaki avion je namjenski pravljen..
ovaj transportuje trupove i ostale aerodinamicke povrsine AIRBUS-ova iz fabrika po Evropi u fracuski Tuluz gdje se sklapaju AIRBUS-ovi. U ovog je trup toliki da moze stati trup A-380.
ovaj transportuje trupove i ostale aerodinamicke povrsine AIRBUS-ova iz fabrika po Evropi u fracuski Tuluz gdje se sklapaju AIRBUS-ovi. U ovog je trup toliki da moze stati trup A-380.
-
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- Posts: 7727
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#914 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Dassault Rafale M F3-R polijeće sa nosača aviona U.S.S. Harry S. Truman (CVN 75) ....
Izvor fotografije: Twitter nalog nosača aviona U.S.S. Harry S. Truman (CVN 75)
Izvor fotografije: Twitter nalog nosača aviona U.S.S. Harry S. Truman (CVN 75)
- mayab
- Posts: 27176
- Joined: 06/03/2008 13:00
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#915 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Ljubitelji aviona, pratite li na Nacionalnoj geografiji " Istrage avionskih nesreća" serijal ?
- drndalo
- Posts: 22820
- Joined: 26/06/2006 16:34
- Location: Sarajevo
#916 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Naravno da ne moze... Skoro svi ostali mogu, ali ovaj bas i ne moze...
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#917 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
https://www.easa.europa.eu/the-agency/r ... akeholders
EASA’s application of restrictive measures taken by the European Union in view of Russia’s military attack on Ukraine
EASA’s application of restrictive measures taken by the European Union in view of Russia’s military attack on Ukraine
- prasoje
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#919 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
- prasoje
- Posts: 783
- Joined: 04/02/2020 11:10
#920 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Studenti Mašinskog fakulteta i nova letelica "feniks" idu na takmičenje u Minhen
https://www.rts.rs/page/magazine/ci/sto ... inhen.html
https://www.rts.rs/page/magazine/ci/sto ... inhen.html
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#921 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Ništa naročito sa gornjim projektom, tiltrotor je stari, znatno uspješniji dizajn:prasoje wrote: ↑16/04/2022 21:13 Studenti Mašinskog fakulteta i nova letelica "feniks" idu na takmičenje u Minhen
https://www.rts.rs/page/magazine/ci/sto ... inhen.html
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- prasoje
- Posts: 783
- Joined: 04/02/2020 11:10
#923 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
Ma, ja vest više postavio zbog samog takmičenja i studenata. O njima sam okačio link i pre dve godine.KraljicaIzJajca wrote: ↑17/04/2022 08:38 Ništa naročito sa gornjim projektom, tiltrotor je stari, znatno uspješniji dizajn
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#924 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
prasoje wrote: ↑17/04/2022 10:06Ma, ja vest više postavio zbog samog takmičenja i studenata. O njima sam okačio link i pre dve godine.KraljicaIzJajca wrote: ↑17/04/2022 08:38 Ništa naročito sa gornjim projektom, tiltrotor je stari, znatno uspješniji dizajn
- ElRe
- Posts: 10830
- Joined: 12/12/2011 11:28
#925 Re: Avijacija (zrakoplovstvo ili vazduhoplovstvo)
TC-JYB 737-900 se pokvario i otkazan je današnji jutarnji let SJJ-IST.