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Re: What I don't understand.
Posted By: SiliconDream=PN= <querl@uclink4.berkeley.edu>	Date: 1/9/00 9:32 p.m.
In Response To: Re: What I don't understand. (Magh Tuireadh) > Here's the real kicker. Since you have negated the missile's > tangential velocity, and then added enough of a Y direction > (radial) velocity to get it to the center, it will continue > straight upwards, towards the other side opposite side of the > ring, but only to a non-rotating observer. The person sitting on > the ring who just fired the missile would be surprised > (depending on what the Missile's initial radial velocity - > radial escape velocity of the ring = average net radial velocity > actually is) to see the missile totally miss its intended > target. By counteracting the spin of the ring completely, and > then aiming the rocket launcher accordingly, it becomes > virtually impossible to hit your intended target. > The added difficulty becomes is that a trajectory must now be > calculated involving the rotation of the ring, and the time it > takes for the missile to traverse the diameter of the ring. The > initial radial velocity of the object must be calculated > precisely so that it will reach the opposite side of the ring > when the correct portion of the ring is underneath. Or, one can > adjust the initial launch vector accordingly and fire missile on > a more direct path to the exact point where the target will be > in however many minutes. Quite. This is another reason why you'd need more radial velocity than the bare minimum. I should dig out the calculations where I figured out how to fire a shell from a given point A to a given point B on the Halo; maybe tomorrow. > On another note, I also did a fairly simple algebraic derivation > and ended up with -vi^2/g=2d=16000000m (this assumes the target > distance to be exactly the radius and the final velocity to be > 0, which it would be at that distance). Now, as others have > pointed out, g is almost impossible to calculate, so vi is too. > However, what this does show us, is that g is miniscule in > comparison to vi, no matter what vi really is. The fact of the > matter, is that there is gravity pulling from the other portions > of the ring, so haowever massive or dense the ring is, it is > (assuming a fairly uniform ring) counteracted by the rest of the > ring. Just an interesting tid bit, eh? Gravity will never > interfere that much, but one still must account for the Lagrange > point in the middle of the ring. The missle, if fired at only > the necessary radial escape velocity, would get stuck there. You > need an extra push to get it just past the center. Point of clarification: The Halo is *in* an orbit (a halo orbit, no less) around the Lagrange point. The ring itself doesn't surround the point. It circles, rather than *en*circling > This isnt crucial, but since people were debating missile > trajectories, I felt it would be important to bring this up. It > would be hilarious if u were on the other side of the ring when > the missile hit, and it killed u instead of ur enemy. Yeah, we discuss something like this every month or so, then completely forget what it was we worked out. :) --SiliconDream

Message Index

A few points	SiliconDream=PN=	1/8/00 11:45 p.m.
Re: A few points	Mark Levin	1/9/00 12:30 a.m.
Re: A few points	SiliconDream=PN=	1/9/00 4:00 a.m.
I saw it too.. I think...	DeusExMachina =PN=	1/9/00 4:13 a.m.
What I don't understand.	Manus_Lacatus	1/9/00 12:32 p.m.
Re: What I don't understand.	Mark Levin	1/9/00 1:26 p.m.
Re: What I don't understand.	Chris Huff	1/9/00 1:42 p.m.
Re: What I don't understand.	Mage	1/9/00 2:26 p.m.
Bungie is doing this on purpose...	Daft Shadow =PN=	1/9/00 3:19 p.m.
Re: Bungie is doing this on purpose...	Dr. Nick	1/9/00 4:37 p.m.
Re: Bungie is doing this on purpose...	SiliconDream=PN=	1/9/00 5:38 p.m.
Re: Bungie is doing this on purpose...	Mage	1/9/00 6:00 p.m.
Re: Bungie is doing this on purpose...	Daft Shadow =PN=	1/9/00 6:19 p.m.
Re: Bungie is doing this on purpose...	Mage	1/9/00 9:13 p.m.
Ouch...	Daft Shadow =PN=	1/10/00 12:06 a.m.
Re: Ouch...	Draeger	1/10/00 6:14 a.m.
I can fly....really I can...(NT)	Magh Tuireadh	1/10/00 7:44 a.m.
After a mortar hit :) NT	Draeger	1/10/00 2:51 p.m.
Re: Ouch...	Someguy	1/10/00 3:24 p.m.
Re: What I don't understand.	SiliconDream=PN=	1/9/00 3:52 p.m.
Re: What I don't understand.	Mage	1/9/00 4:15 p.m.
Heh we asked for it, but....	DeusExMachina =PN=	1/9/00 8:01 p.m.
Re: Heh we asked for it, but....	Magh Tuireadh	1/9/00 8:07 p.m.
Re: Heh we asked for it, but....	Otokam	1/9/00 8:35 p.m.
Gah....Gravity!	Magh Tuireadh	1/9/00 9:07 p.m.
Re: Gah....Gravity!	Otokam	1/10/00 2:55 a.m.
Really?	Magh Tuireadh	1/10/00 7:38 a.m.
Re: Really?	SiliconDream=PN=	1/10/00 4:18 p.m.
Unfortunately not...	SiliconDream=PN=	1/9/00 9:40 p.m.
Hey, cool!	DeusExMachina =PN=	1/10/00 12:45 a.m.
Re: What I don't understand.	Magh Tuireadh	1/9/00 8:03 p.m.
Re: What I don't understand.	SiliconDream=PN=	1/9/00 9:32 p.m.
Atmosphere?	Goat	1/9/00 4:19 p.m.
Re: Atmosphere?	Mage	1/9/00 4:20 p.m.
Re: I saw it too.. I think...	SiliconDream=PN=	1/9/00 3:05 p.m.
Re: A few points	Bachus	1/9/00 4:08 a.m.
Re: A few points	Dead Glory	1/9/00 11:51 a.m.
Re: A few points	SiliconDream=PN=	1/9/00 2:57 p.m.
Re: A few points	Bachus	1/9/00 4:24 p.m.
Re: A few points	Mage	1/9/00 4:32 p.m.