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Old 05-07-2007, 03:59 PM   #1
Bęthberry
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The Drag Theory of Aerodynamic Thrust

Quote:
Originally Posted by alatar
The question is, then, could Legolas cross this grass undetected, and if so, could he make a 'grass angel' on the same?


**For those of you apt to test this hypothesis, please get the permission of the lawn's owner, as some folk take yard work a bit too seriously.
Frankly, I doubt Legolas could have the same affect on lawn as on snow, due to the very different natures of the media through which he would be passing.

The wind created by his passing would produce several consequences. First, the frictional drag could in fact create higher temperatures than the grass could sustain, with the effect that Legolas would leave a trail of burnt grass tips marking his path. One possibility.

A second would be the effect simply of the sway in the grass caused by the aerodynamic force of his body through the air. This sway in the grass could then create an ever-so-slight beaten path in those areas over which he flew/trod--flod? Yes, perhaps elves do flod. Furthermore, turbulance is a natural effect of movement through air. This could in fact produce a random pattern of grass damage. Not crop circles I would think, but still erratic patches where the grass has been bent.

Either way, I think Legolas and other elves had best graze elsewhere than your neighbours' lawn.
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Old 05-09-2007, 11:02 AM   #2
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Quote:
Originally Posted by Bęthberry
Frankly, I doubt Legolas could have the same affect on lawn as on snow, due to the very different natures of the media through which he would be passing.
True, frozen water and grass are somewhat different. Grass contains a lot of water, but also, unlike H2O, it contains cellulose, which can be found in glasses of water when a natural laxative is prepared, but that has nothing to do with elves as far as we can tell.



Quote:
The wind created by his passing would produce several consequences. First, the frictional drag could in fact create higher temperatures than the grass could sustain, with the effect that Legolas would leave a trail of burnt grass tips marking his path. One possibility.
Have considered this, and have noted that tornadoes drive, at the very least, particles across grass at very high speeds. I've seen pictures of the devastation left in the wake of a tornado, but have never noted any fires causes by the tornado that weren't generated by other means (downed power lines, petrol/natural gas leaks, etc). So I'm not sure that Legolas's passage would create enough heat to singe the grass tips. Even if it did, not sure how the same would play out on the snow, as one, at the very least, would see meltings where Legolas's slippers touched the frozen water, and so would negate the observation that the elf prince left little to no evidence of his passing.

Also, if enough elves singed enough grass, as surely the First Age elves would have done to a greater degree, we would have seen a response from Yavanna. On the other hand again, we never did discover the purpose of the ent-wives...

On even yet another hand, didn't the touch of Lúthien Tinúviel cause the spontaneous appearance of flowers? So maybe there is something to the toes of fire theory, as some plants, such as Jack pines, require fire to grow (well, to be seeded). Were the elves the 'honey bees' of the forest and grassy plains?


Quote:
A second would be the effect simply of the sway in the grass caused by the aerodynamic force of his body through the air. This sway in the grass could then create an ever-so-slight beaten path in those areas over which he flew/trod--flod? Yes, perhaps elves do flod. Furthermore, turbulance is a natural effect of movement through air. This could in fact produce a random pattern of grass damage. Not crop circles I would think, but still erratic patches where the grass has been bent.
I'm sure that elven flodding is well-documented in story and song:


Quote:
The leaves were long, the grass was singed,
The hemlock-umbels tall and flaring,
And in the glade the flames did binge,
On grass and and sticks and nightingale wings blazing.
Tinuviel was flodding there
To the beat of a drummer unseen,
And light of fire was in her hair,
And she danced like her backside was catching.

Quote:
Either way, I think Legolas and other elves had best graze elsewhere than your neighbours' lawn.
In my neck of the woods, anyone looking like Paris Hilton prancing upon one's lawn is just asking for trouble.
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Last edited by alatar; 05-09-2007 at 11:48 AM.
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Old 05-15-2007, 07:42 AM   #3
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Leaf hunka hunka hunka burning fëa

Let me tell you 'bout the birds and the bees
And the flowers and the trees
And the moon up above
And a thing called e ... e... e ... elves



Quote:
Originally Posted by alatar
Were the elves the 'honey bees' of the forest and grassy plains?
I think you are on something here, alatar. While your survey of the effects of Seventh Age tornados fails to uncover any burnt blades, we do know that many processes in Middle earth have faded. We also know that with elves, their fëa gradually burns away their hröa (possibly a speedier form of composting?), so clearly they have an excess of energy, once could say. Why, I could even rewrite Einstein's famous equation for this if only I knew how to make the nifty raised square sign.

So great is this energy in elves that it is well to remember the fate of Fëanor, whose very name signifies this process. Remember that his hröa was completely consumed by his fëa upon his death. I don't have to mention how hot this must have made the Great Elf, as we all know what temperatures are needed to cremate a human body. Now, if this was true of Fëanor, it must be true at least in some measure for Legolas, who is undoubtedly the hottest elf of the Third Age.
He was, after all, instrumental in the regreening of Ithilien--making it the fairest land in all the west--after the fall of Sauron, so he must have had an extraordinary hand at pollinating. Perhaps the lack of burnt blades could simply be attributed to his artful use of withdrawing his fëa so that his hröa as well as the grass was not consumed.
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Old 05-15-2007, 09:20 AM   #4
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Quote:
Originally Posted by Bethberry
The wind created by his passing would produce several consequences. First, the frictional drag could in fact create higher temperatures than the grass could sustain, with the effect that Legolas would leave a trail of burnt grass tips marking his path.
I think that you’d have more than just singed grass tips. If you have air moving fast enough to cause that level of heat via friction, you have an influx of enough oxygen to feed a smoldering grass blade into full flame, reducing it to ash in scant milliseconds. That’s why folks trying to start a fire using the old boy-scout method will blow on the smoldering tinder to coax a flame from it. You wouldn’t have singed tips – at the least you’d have blackened footprints, and possible forest fires.

I am reminded of an account I read some years ago of a reporter taken for a ride in an SR-71 Blackbird reconnaissance jet who was warned not to touch the windshield once they hit Mach 2 (approximately 1500 mph or 2450 kph) – the temperature of the glass was high enough to blister the skin. Even so, I doubt that even that speed could have started a fire.

Further, if elves could generate that level of moving air, what’s to prevent them from actual flight? If they can “flod” over grass without harming or even marking it, it would surely be a small step to actual flight. I think there must be some other mechanism by which the elves negated the effects of their weight on snow or grass.

At the risk of bringing Treknobabble into a Tolkien website, I used to think that the elves lack of effect on snow or grass involved a partial negation of the effects of gravity – not so much as to become weightless, otherwise they’d just float away – but enough that their weight does not press down with enough force to mark their passing. However, this theory has as many problems as the wind/friction idea, because what’s to prevent elves from exerting this power just a bit more and achieving actual flight? Or at least the ability to hover over a battle out of reach of swords? (Wow, think of the advantages of a battalion of air-elves at an altitude of 500 feet or so, shooting arrows into a ground-bound division of orcs?)
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Old 05-18-2007, 08:42 PM   #5
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Leaf

Hmm ... well, I always had this idea that Elf bodies were light while their spirits made up the difference. So they could dance on a rope stretched across a river, but put their spirit as well as their body strength behind blows or landing on someone. Their spirit (is that their fëa? ::ignorant:: ) is what makes them quick, have high endurance, &c., &c., &c.

Quote:
Originally Posted by Thenamir
Wow, think of the advantages of a battalion of air-elves at an altitude of 500 feet or so, shooting arrows into a ground-bound division of orcs?
Fantastic!
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Old 06-25-2007, 12:10 PM   #6
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Quote:
Originally Posted by Thenamir
I am reminded of an account I read some years ago of a reporter taken for a ride in an SR-71 Blackbird reconnaissance jet who was warned not to touch the windshield once they hit Mach 2 (approximately 1500 mph or 2450 kph) – the temperature of the glass was high enough to blister the skin. Even so, I doubt that even that speed could have started a fire.
Think that we're talking about 'specific heat,' or 'heat capacity.' It's been said that, when you're baking/cooking, you're not as concerned about touching the thing that you're making as much as the thing that you're using to make it. In other words, the cake may be hot, but the pan will surely burn you. This metaphor comes up a lot when people discuss firewalking - walking barefoot across burning coals without harm to the skin. Many love to attribute this feat to magic and mysticism and the alteration of quantum auras (gotta use the word quantum to give it that new science smell), but it's simply physics. Hot burning wood 'holds' less heat than would an iron plate set across the same coals. You'll get away unscathed walking the coals, but not the plate.

Anyway, so even if the elves had hot feet, not sure if this heat would more than wilt the grass tips. But that's conjecture.


Quote:
Further, if elves could generate that level of moving air, what’s to prevent them from actual flight? If they can “flod” over grass without harming or even marking it, it would surely be a small step to actual flight. I think there must be some other mechanism by which the elves negated the effects of their weight on snow or grass.
"That's one small flod for Nóm, one giant flod for elfkind..."


Quote:
At the risk of bringing Treknobabble into a Tolkien website, I used to think that the elves lack of effect on snow or grass involved a partial negation of the effects of gravity – not so much as to become weightless, otherwise they’d just float away – but enough that their weight does not press down with enough force to mark their passing. However, this theory has as many problems as the wind/friction idea, because what’s to prevent elves from exerting this power just a bit more and achieving actual flight? Or at least the ability to hover over a battle out of reach of swords?
Problem with anti-gravity - physics aside (we ARE discussing elves ) - is how do these floating ones swing a sword, hoist a wine barrel or taunt a Dwarf? All, or at least two of the three, require the elf's feet to be firmly pushing against Arda in the equal and opposite direction as the action being performed (if I got that right). Just try to swordfight on wet ice...actually, don't, as that would fall under the 'that's silly and you most likely will get harmed or dead, and so don't do it' list of suggestions best disregarded.

Quote:
(Wow, think of the advantages of a battalion of air-elves at an altitude of 500 feet or so, shooting arrows into a ground-bound division of orcs?)
These aren't Peter Jackson's elves, are they?
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Old 06-26-2007, 08:44 AM   #7
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Quote:
Originally Posted by alatar
Many love to attribute this feat to magic and mysticism and the alteration of quantum auras (gotta use the word quantum to give it that new science smell), but it's simply physics.
Any mention of auras deserves a reply from me.

Quote:
Originally Posted by alatar
Anyway, so even if the elves had hot feet, not sure if this heat would more than wilt the grass tips. But that's conjecture.
Oh now I'm really confused. There's a product called "Hot Foot" for roof tops and buttresses, etc, designed to keep pigeons away. I believe it is filled with chili powder, which, when stepped on by said avians, results in high stepping birds who lite out of the place quickly.

Quote:
Originally Posted by Thenamir
I think there must be some other mechanism by which the elves negated the effects of their weight on snow or grass.
Thinking about chili in "Hot Foot" made me reconsider this comment by Thenamir. What exactly happens to grass when it is stepped on or bent? Could it not be possible for elven healing arts to be able to reverse almost simultaneously the damage made by stepping on grass? Their feet could possibly be coated with some sort of healing herb that would, um, reforge the broken blades. If King's Foil heals people, perhaps there is a similar herb* to heal plants.

*Or possibly the same effect could be achieved by the delicate nature of elven foot sweat. Elves eat lembas. Perhaps some of the extraordinary qualities of the lembas are exuded in elven sweat?

EDIT: Given elven sensibilities, anyone offended by the use of the word "sweat" could substitute for it the word "perspiration."
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Last edited by Bęthberry; 06-26-2007 at 09:43 AM.
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Old 06-26-2007, 01:11 PM   #8
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Surely Orcs sweat, Dwarves perspire, Elves glow !!
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