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Could a dragon use hot air to help it take off?



The Next CEO of Stack OverflowHow to convince a dragon to help people in battle?Could this Very Specific Dragon Fly?How to take down a dragon?How could cowboys and settlers in the 1880s slay a dragon?How to most effectively use a dragon using medieval level technology?Is there a reason a flying species can't use lighter than air gas to help provide lift?Can a dragon who can heat parts of its body at will use that to fly?Alternate uses for dragon wings?How hot is my dragon?Could a dragon use its wings to swim?










3












$begingroup$


So a friend of mine came up with an interesting question. Considering the fairly universal following facts about western-style fantasy dragons:



a) dragons can breath fire



b) dragons themselves are fireproof



c) dragons have large wings, allowing them to fly (though the actual science of this is well-known to be fishy, let's for now pretend a dragon such as Toothless or Smaug can actually fly. Super light bones or whatever.)



d) hot air rises and creates lift



If the dragon can produce a large quantity/sizable blast of extremely high heat, could it be useful to the dragon for it napalm/torch the ground beneath it as it was taking off, in order to create additional lift for itself? Or would the effect of doing this be so negligible that it wouldn't be worth it to bother?










share|improve this question







New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    This isn't quite what you're asking, so I'm leaving it as a comment rather than an answer, but there was a pseudo-documentary (possibly this one: en.wikipedia.org/wiki/The_Last_Dragon_(2004_film) ) about dragons (the framing device being that it was a real documentary made in a world where they existed) that discussed something similar. Its dragons didn't fly by using their fire breath to heat air; rather, they had a swim bladder-like organ filled with hydrogen that was used to both maintain buoyancy for flight and to fuel the fire breath.
    $endgroup$
    – Ray
    2 hours ago
















3












$begingroup$


So a friend of mine came up with an interesting question. Considering the fairly universal following facts about western-style fantasy dragons:



a) dragons can breath fire



b) dragons themselves are fireproof



c) dragons have large wings, allowing them to fly (though the actual science of this is well-known to be fishy, let's for now pretend a dragon such as Toothless or Smaug can actually fly. Super light bones or whatever.)



d) hot air rises and creates lift



If the dragon can produce a large quantity/sizable blast of extremely high heat, could it be useful to the dragon for it napalm/torch the ground beneath it as it was taking off, in order to create additional lift for itself? Or would the effect of doing this be so negligible that it wouldn't be worth it to bother?










share|improve this question







New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    This isn't quite what you're asking, so I'm leaving it as a comment rather than an answer, but there was a pseudo-documentary (possibly this one: en.wikipedia.org/wiki/The_Last_Dragon_(2004_film) ) about dragons (the framing device being that it was a real documentary made in a world where they existed) that discussed something similar. Its dragons didn't fly by using their fire breath to heat air; rather, they had a swim bladder-like organ filled with hydrogen that was used to both maintain buoyancy for flight and to fuel the fire breath.
    $endgroup$
    – Ray
    2 hours ago














3












3








3





$begingroup$


So a friend of mine came up with an interesting question. Considering the fairly universal following facts about western-style fantasy dragons:



a) dragons can breath fire



b) dragons themselves are fireproof



c) dragons have large wings, allowing them to fly (though the actual science of this is well-known to be fishy, let's for now pretend a dragon such as Toothless or Smaug can actually fly. Super light bones or whatever.)



d) hot air rises and creates lift



If the dragon can produce a large quantity/sizable blast of extremely high heat, could it be useful to the dragon for it napalm/torch the ground beneath it as it was taking off, in order to create additional lift for itself? Or would the effect of doing this be so negligible that it wouldn't be worth it to bother?










share|improve this question







New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




So a friend of mine came up with an interesting question. Considering the fairly universal following facts about western-style fantasy dragons:



a) dragons can breath fire



b) dragons themselves are fireproof



c) dragons have large wings, allowing them to fly (though the actual science of this is well-known to be fishy, let's for now pretend a dragon such as Toothless or Smaug can actually fly. Super light bones or whatever.)



d) hot air rises and creates lift



If the dragon can produce a large quantity/sizable blast of extremely high heat, could it be useful to the dragon for it napalm/torch the ground beneath it as it was taking off, in order to create additional lift for itself? Or would the effect of doing this be so negligible that it wouldn't be worth it to bother?







dragons flight






share|improve this question







New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question






New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 5 hours ago









MarielSMarielS

1458




1458




New contributor




MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






MarielS is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • $begingroup$
    This isn't quite what you're asking, so I'm leaving it as a comment rather than an answer, but there was a pseudo-documentary (possibly this one: en.wikipedia.org/wiki/The_Last_Dragon_(2004_film) ) about dragons (the framing device being that it was a real documentary made in a world where they existed) that discussed something similar. Its dragons didn't fly by using their fire breath to heat air; rather, they had a swim bladder-like organ filled with hydrogen that was used to both maintain buoyancy for flight and to fuel the fire breath.
    $endgroup$
    – Ray
    2 hours ago

















  • $begingroup$
    This isn't quite what you're asking, so I'm leaving it as a comment rather than an answer, but there was a pseudo-documentary (possibly this one: en.wikipedia.org/wiki/The_Last_Dragon_(2004_film) ) about dragons (the framing device being that it was a real documentary made in a world where they existed) that discussed something similar. Its dragons didn't fly by using their fire breath to heat air; rather, they had a swim bladder-like organ filled with hydrogen that was used to both maintain buoyancy for flight and to fuel the fire breath.
    $endgroup$
    – Ray
    2 hours ago
















$begingroup$
This isn't quite what you're asking, so I'm leaving it as a comment rather than an answer, but there was a pseudo-documentary (possibly this one: en.wikipedia.org/wiki/The_Last_Dragon_(2004_film) ) about dragons (the framing device being that it was a real documentary made in a world where they existed) that discussed something similar. Its dragons didn't fly by using their fire breath to heat air; rather, they had a swim bladder-like organ filled with hydrogen that was used to both maintain buoyancy for flight and to fuel the fire breath.
$endgroup$
– Ray
2 hours ago





$begingroup$
This isn't quite what you're asking, so I'm leaving it as a comment rather than an answer, but there was a pseudo-documentary (possibly this one: en.wikipedia.org/wiki/The_Last_Dragon_(2004_film) ) about dragons (the framing device being that it was a real documentary made in a world where they existed) that discussed something similar. Its dragons didn't fly by using their fire breath to heat air; rather, they had a swim bladder-like organ filled with hydrogen that was used to both maintain buoyancy for flight and to fuel the fire breath.
$endgroup$
– Ray
2 hours ago











2 Answers
2






active

oldest

votes


















3












$begingroup$

Unlikely if not impossible. The lift created by heat (pressure differences) is different than the lift created by the wings (mechanical). The "help" given by one is unlikely to help the other - and the difference would likely be negligible.



Mechanical Lift



Lift as a mechanical force is created by motion. Here is a good explanation, and Wikipedia has a decent article on lift. You can read more about how birds create lift here.



Pressure Lift



Lift by pressure differences is how hot balloons work - but this is because of the density of the balloon (here, dragon) in relation to the surrounding air. Unless the dragon could contain the heat entirely beneath it, the heat would dissipate very rapidly - especially if it is significantly hotter than the air around it. This would make for a very bad way to create lift.



Cannons



I suppose, in theory, if a dragon was stuck upside-down inside a pipe, then a good heave might push it out. But this would be more like how cannons and firearms work than any concept of actual lift. In such a scenario, the dragon would be "pushed" out, and could then flap it's wings - assuming that it could create enough of an explosion (fireball) to force itself loose.






share|improve this answer









$endgroup$












  • $begingroup$
    Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
    $endgroup$
    – MarielS
    4 hours ago











  • $begingroup$
    In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
    $endgroup$
    – JBH
    1 hour ago


















3












$begingroup$

Thermal Soaring



I think its possible:



  • Birds like raptors (eagles/hawks etc), vultures, and storks can gain altitude without flapping by hopping a ride on a rising column of warm air. This is called Thermal Soaring.

  • We assume (according to your point c) that dragons can fly reasonably well, but can they soar? Soaring ability in dragons seams likely, as dragons are typically thought of as carnivores which means they have to fly around looking for prey to catch (like eagles/hawks) or fly around looking for dead prey (vultures/condors). All that flying around means you need to be energy efficient and be able to soar. If dragons are capable of soaring in general, then they should be capable of thermal soaring as well.

  • According to my googling, wildfires can cause thermal columns.

Thus, the dragon starts a wildfire, takes off for flight (likely by jumping up like giant pterosaurs) and flaps a few times to get in the air over the wildfire, and then can thermal soar up high.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
    $endgroup$
    – L.Dutch
    50 mins ago












Your Answer





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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









3












$begingroup$

Unlikely if not impossible. The lift created by heat (pressure differences) is different than the lift created by the wings (mechanical). The "help" given by one is unlikely to help the other - and the difference would likely be negligible.



Mechanical Lift



Lift as a mechanical force is created by motion. Here is a good explanation, and Wikipedia has a decent article on lift. You can read more about how birds create lift here.



Pressure Lift



Lift by pressure differences is how hot balloons work - but this is because of the density of the balloon (here, dragon) in relation to the surrounding air. Unless the dragon could contain the heat entirely beneath it, the heat would dissipate very rapidly - especially if it is significantly hotter than the air around it. This would make for a very bad way to create lift.



Cannons



I suppose, in theory, if a dragon was stuck upside-down inside a pipe, then a good heave might push it out. But this would be more like how cannons and firearms work than any concept of actual lift. In such a scenario, the dragon would be "pushed" out, and could then flap it's wings - assuming that it could create enough of an explosion (fireball) to force itself loose.






share|improve this answer









$endgroup$












  • $begingroup$
    Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
    $endgroup$
    – MarielS
    4 hours ago











  • $begingroup$
    In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
    $endgroup$
    – JBH
    1 hour ago















3












$begingroup$

Unlikely if not impossible. The lift created by heat (pressure differences) is different than the lift created by the wings (mechanical). The "help" given by one is unlikely to help the other - and the difference would likely be negligible.



Mechanical Lift



Lift as a mechanical force is created by motion. Here is a good explanation, and Wikipedia has a decent article on lift. You can read more about how birds create lift here.



Pressure Lift



Lift by pressure differences is how hot balloons work - but this is because of the density of the balloon (here, dragon) in relation to the surrounding air. Unless the dragon could contain the heat entirely beneath it, the heat would dissipate very rapidly - especially if it is significantly hotter than the air around it. This would make for a very bad way to create lift.



Cannons



I suppose, in theory, if a dragon was stuck upside-down inside a pipe, then a good heave might push it out. But this would be more like how cannons and firearms work than any concept of actual lift. In such a scenario, the dragon would be "pushed" out, and could then flap it's wings - assuming that it could create enough of an explosion (fireball) to force itself loose.






share|improve this answer









$endgroup$












  • $begingroup$
    Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
    $endgroup$
    – MarielS
    4 hours ago











  • $begingroup$
    In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
    $endgroup$
    – JBH
    1 hour ago













3












3








3





$begingroup$

Unlikely if not impossible. The lift created by heat (pressure differences) is different than the lift created by the wings (mechanical). The "help" given by one is unlikely to help the other - and the difference would likely be negligible.



Mechanical Lift



Lift as a mechanical force is created by motion. Here is a good explanation, and Wikipedia has a decent article on lift. You can read more about how birds create lift here.



Pressure Lift



Lift by pressure differences is how hot balloons work - but this is because of the density of the balloon (here, dragon) in relation to the surrounding air. Unless the dragon could contain the heat entirely beneath it, the heat would dissipate very rapidly - especially if it is significantly hotter than the air around it. This would make for a very bad way to create lift.



Cannons



I suppose, in theory, if a dragon was stuck upside-down inside a pipe, then a good heave might push it out. But this would be more like how cannons and firearms work than any concept of actual lift. In such a scenario, the dragon would be "pushed" out, and could then flap it's wings - assuming that it could create enough of an explosion (fireball) to force itself loose.






share|improve this answer









$endgroup$



Unlikely if not impossible. The lift created by heat (pressure differences) is different than the lift created by the wings (mechanical). The "help" given by one is unlikely to help the other - and the difference would likely be negligible.



Mechanical Lift



Lift as a mechanical force is created by motion. Here is a good explanation, and Wikipedia has a decent article on lift. You can read more about how birds create lift here.



Pressure Lift



Lift by pressure differences is how hot balloons work - but this is because of the density of the balloon (here, dragon) in relation to the surrounding air. Unless the dragon could contain the heat entirely beneath it, the heat would dissipate very rapidly - especially if it is significantly hotter than the air around it. This would make for a very bad way to create lift.



Cannons



I suppose, in theory, if a dragon was stuck upside-down inside a pipe, then a good heave might push it out. But this would be more like how cannons and firearms work than any concept of actual lift. In such a scenario, the dragon would be "pushed" out, and could then flap it's wings - assuming that it could create enough of an explosion (fireball) to force itself loose.







share|improve this answer












share|improve this answer



share|improve this answer










answered 5 hours ago









cegfaultcegfault

1,412512




1,412512











  • $begingroup$
    Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
    $endgroup$
    – MarielS
    4 hours ago











  • $begingroup$
    In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
    $endgroup$
    – JBH
    1 hour ago
















  • $begingroup$
    Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
    $endgroup$
    – MarielS
    4 hours ago











  • $begingroup$
    In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
    $endgroup$
    – JBH
    1 hour ago















$begingroup$
Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
$endgroup$
– MarielS
4 hours ago





$begingroup$
Fascinating, thanks. I just got a wonderful image of loading tiny dragons upside down into launch tubes and watching them blast themselves backwards out again like little rockets. That mental image in going to feed my happy for a while :D
$endgroup$
– MarielS
4 hours ago













$begingroup$
In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
$endgroup$
– JBH
1 hour ago




$begingroup$
In fact, if you ask any pilot who's had to take-off from McCarran International Airport in Las Vegas during high summer, they'll tell you that hot air is horrible for lift-off because it causes the molecules to move further apart, meaning there's fewer molecules under the wings to encourage lift. I've seen some planes leaving McCarran in August that I wondered would get off the ground before the end of the runway.
$endgroup$
– JBH
1 hour ago











3












$begingroup$

Thermal Soaring



I think its possible:



  • Birds like raptors (eagles/hawks etc), vultures, and storks can gain altitude without flapping by hopping a ride on a rising column of warm air. This is called Thermal Soaring.

  • We assume (according to your point c) that dragons can fly reasonably well, but can they soar? Soaring ability in dragons seams likely, as dragons are typically thought of as carnivores which means they have to fly around looking for prey to catch (like eagles/hawks) or fly around looking for dead prey (vultures/condors). All that flying around means you need to be energy efficient and be able to soar. If dragons are capable of soaring in general, then they should be capable of thermal soaring as well.

  • According to my googling, wildfires can cause thermal columns.

Thus, the dragon starts a wildfire, takes off for flight (likely by jumping up like giant pterosaurs) and flaps a few times to get in the air over the wildfire, and then can thermal soar up high.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
    $endgroup$
    – L.Dutch
    50 mins ago
















3












$begingroup$

Thermal Soaring



I think its possible:



  • Birds like raptors (eagles/hawks etc), vultures, and storks can gain altitude without flapping by hopping a ride on a rising column of warm air. This is called Thermal Soaring.

  • We assume (according to your point c) that dragons can fly reasonably well, but can they soar? Soaring ability in dragons seams likely, as dragons are typically thought of as carnivores which means they have to fly around looking for prey to catch (like eagles/hawks) or fly around looking for dead prey (vultures/condors). All that flying around means you need to be energy efficient and be able to soar. If dragons are capable of soaring in general, then they should be capable of thermal soaring as well.

  • According to my googling, wildfires can cause thermal columns.

Thus, the dragon starts a wildfire, takes off for flight (likely by jumping up like giant pterosaurs) and flaps a few times to get in the air over the wildfire, and then can thermal soar up high.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
    $endgroup$
    – L.Dutch
    50 mins ago














3












3








3





$begingroup$

Thermal Soaring



I think its possible:



  • Birds like raptors (eagles/hawks etc), vultures, and storks can gain altitude without flapping by hopping a ride on a rising column of warm air. This is called Thermal Soaring.

  • We assume (according to your point c) that dragons can fly reasonably well, but can they soar? Soaring ability in dragons seams likely, as dragons are typically thought of as carnivores which means they have to fly around looking for prey to catch (like eagles/hawks) or fly around looking for dead prey (vultures/condors). All that flying around means you need to be energy efficient and be able to soar. If dragons are capable of soaring in general, then they should be capable of thermal soaring as well.

  • According to my googling, wildfires can cause thermal columns.

Thus, the dragon starts a wildfire, takes off for flight (likely by jumping up like giant pterosaurs) and flaps a few times to get in the air over the wildfire, and then can thermal soar up high.






share|improve this answer











$endgroup$



Thermal Soaring



I think its possible:



  • Birds like raptors (eagles/hawks etc), vultures, and storks can gain altitude without flapping by hopping a ride on a rising column of warm air. This is called Thermal Soaring.

  • We assume (according to your point c) that dragons can fly reasonably well, but can they soar? Soaring ability in dragons seams likely, as dragons are typically thought of as carnivores which means they have to fly around looking for prey to catch (like eagles/hawks) or fly around looking for dead prey (vultures/condors). All that flying around means you need to be energy efficient and be able to soar. If dragons are capable of soaring in general, then they should be capable of thermal soaring as well.

  • According to my googling, wildfires can cause thermal columns.

Thus, the dragon starts a wildfire, takes off for flight (likely by jumping up like giant pterosaurs) and flaps a few times to get in the air over the wildfire, and then can thermal soar up high.







share|improve this answer














share|improve this answer



share|improve this answer








edited 3 hours ago

























answered 3 hours ago









B.KenobiB.Kenobi

1193




1193







  • 1




    $begingroup$
    When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
    $endgroup$
    – L.Dutch
    50 mins ago













  • 1




    $begingroup$
    When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
    $endgroup$
    – L.Dutch
    50 mins ago








1




1




$begingroup$
When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
$endgroup$
– L.Dutch
50 mins ago





$begingroup$
When Nurmberg was bombed during WWII the resulting tempest of fire lifted up in the air wooden beams, as reported by some bombers crew. And wooden beams have no wings. So definitely a dragon can use the mechanism you suggest.
$endgroup$
– L.Dutch
50 mins ago











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