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Our Future Among the Stars
- Thread starter Heyo
- Start date
Heyo
Veteran Member
Is not obtainable with the technology we already have and I proposed to use. I.e. hydrogen fusion with refueling by trapping inter solar hydrogen. At about 20% the drag produced by collecting hydrogen limits further acceleration.
Thief
Rogue Theologian
you will feel your weight in the seat ONLY
if acceleration is increasing
when speed becomes constant
you will float out of your chair
if your vehicle cannot increase continually …..you will float
likewise
you drop back in your seat when you hit the brakes
(the ship would be facing the direction from which you came)
if acceleration is increasing
when speed becomes constant
you will float out of your chair
if your vehicle cannot increase continually …..you will float
likewise
you drop back in your seat when you hit the brakes
(the ship would be facing the direction from which you came)
ratiocinator
Lightly seared on the reality grill.
See the wiki article I linked to for the maths: Space travel using constant acceleration - Wikipedia
Thief
Rogue Theologian
so....you go faster and faster
as if that were possible?
and eventually faster than light?
all the while maintaining 1g?
ratiocinator
Lightly seared on the reality grill.
You feel weight as long as you're accelerating (your velocity is increasing).That would be very silly and impractical (you'd need propulsion units at both ends).
ratiocinator
Lightly seared on the reality grill.
Yes.
No.
Yes.
You maintain proper acceleration and therefore follow a hyperbolic path through space-time.
Aupmanyav
Be your own guru
We are imprisoned here on this blue planet like Napoleon was on St. Helena. No where much to go.
Thief
Rogue Theologian
dude....you turn the ship around
That would be very silly and impractical (you'd need propulsion units at both ends).
Thief
Rogue Theologian
fair to say...there are no straight lines of travel
but when the speed of your body becomes the same as the speed of your ship
you will float
so.....if ever you achieve the speed of light
you will still float in your ship
ratiocinator
Lightly seared on the reality grill.
Yes - sorry I misread what you said.
ratiocinator
Lightly seared on the reality grill.
If that were possible (which it isn't), you'd then be experiencing no time, so you wouldn't.
The point is that you can maintain a constant proper acceleration, which will give you 1g, indefinitely without ever reaching light-speed. Proper acceleration is basically constant acceleration in an instantaneously co-moving frame of reference. So at every instant in the journey, if you viewed things from a non-accelerating frame of reference that was at rest relative to you at that instant, you would be accelerating at a constant rate.
Thief
Rogue Theologian
take the distance you want to cover
figure your weight (mass)
against a speed to maintain 1g
the greater the distance
the greater the TIME of acceleration
and SPEED MUST increase continually
so.....if the distance is great enough
you will eventually obtain the speed of light
and float in your ship
or....fail to obtain the speed of light
and float in your ship
in otherwords….your idea applies to a specific distance
THAT distance of which your ship will achieve it's best velocity
then you turn it around and decelerate in exact proportion to the half way point
ratiocinator
Lightly seared on the reality grill.
WHAT? Even in the Newtonian world you seem to be clinging to, 1g is an acceleration (g is the acceleration due to gravity at the surface of the earth) and an acceleration is an increase in speed. Mass only comes into it if you want to know the force needed. Weight isn't mass, weight is the force due to gravity on the Earth: F(weight) = mg.
I suggest you look at the links I've provided - here they are again:
Proper acceleration - Wikipedia
Hyperbolic motion (relativity) - Wikipedia
From the frame of reference of the ship, you can maintain a constant acceleration (proper acceleration) of 1g indefinitely, from the "stationary" frame, your acceleration slows down as you approach light speed (but never stops) - it is hyperbolic.
where are you getting this?
and yes, you are right...you briefly stop accelerating, float while turning the ship around...and then apply a deceleration of 1 g until you reach your destination.
Thief
Rogue Theologian
a college course I took a few years ago
titled....the Known Universe
it was a quick overview of various items we are sure of
well, either you were misinformed, or you've misremembered...G's are not relevant to escape velocity, which is what it sounded like you were talking about...
ratiocinator
Lightly seared on the reality grill.
It, or more likely you, are wrong. You'd have to make other assumptions about the vehicle itself before you could arrive at an acceleration.
Even escape velocity only applies to a non-propelled object. You could escape the Earth at walking pace, with no acceleration at all*, if you could maintain the necessary thrust (exactly balancing the weight).
A rocket, continuously accelerated by its exhaust, need not reach ballistic escape velocity at any distance since it is supplied with additional kinetic energy by the expulsion of its reaction mass. It can achieve escape at any speed, given a suitable mode of propulsion and sufficient propellant to provide the accelerating force on the object to escape
* After you've reached walking pace, that is.
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Heyo
Veteran Member
Maintaining the necessary thrust (aka hovering) is accelerating (at 9.81 m/s^2 on earth).
Escape velocity applies to orbital mechanics. It depends on the mass of the object you're circling and the distance from the object.
If you leave radially (at any speed below escape velocity) and stop accelerating, you drop back.
Leaving radially at low speeds is very expensive because every second you are below escape velocity, you have to pay (thrust) just for staying in place and additionally for getting away.