Release speed

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ABC2019
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Re: Release speed




by ABC2019 » 11/05/21, 08:57

Gildas wrote:At what altitude would the rocket plane stop?

when he ran out of fuel :).

If not for Apollo, I don't know the details of the thrust and flight plan, I'm just telling you that in theory you can escape the earth's pull without ever having reached 11,2 km / s, if you have a continual push. What matters is the speed reached at the end of the push, and the altitude where you are at the moment (there it must be greater than the release speed AT THIS LOCATION).

If the end of the thrust took place close enough to the Earth, the speed should not have been very far from 11,2 km / s since it varies in 1 / root (r)
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Re: Release speed




by gildas » 11/05/21, 09:34

ABC2019 wrote:
Gildas wrote:At what altitude would the rocket plane stop?

when he ran out of fuel :).
)

If the plane quoted by Guy le x15 takes off to immediately reach an altitude of 100 km and wants to go to space, it will not run out of fuel! Even if the plane has no lift and goes vertically with the engine at full power, it will not move forward! Why ???
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Re: Release speed




by ABC2019 » 11/05/21, 10:21

Gildas wrote:
ABC2019 wrote:
Gildas wrote:At what altitude would the rocket plane stop?

when he ran out of fuel :).
)

If the plane quoted by Guy le x15 takes off to immediately reach an altitude of 100 km and wants to go to space, it will not run out of fuel! Even if the plane has no lift and goes vertically with the engine at full power, it will not move forward! Why ???

why are you saying he won't move on? if there is a push, it will move forward. The problem is that the rear-wheel drive is very unstable and with no lift from the atmosphere it might fly anyhow, rockets have sophisticated stabilization mechanisms to prevent that. On the other hand the mig do not carry oxidizer to my knowledge.
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Re: Release speed




by gildas » 11/05/21, 11:50

Not exactly an X15 even with stabilization mechanisms to stay vertical at 100 km altitude will not advance according to Wikipedia according to the law of the speed of release or speed of orbiting.
He will '' skate in the semolina '' vertically even at full power that's what is incomprehensible!
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Re: Release speed




by Obamot » 11/05/21, 12:07

It's not just the fuel that is exhausted in this thread : Mrgreen:
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Re: Release speed




by Christophe » 11/05/21, 12:12

Before the release speed, there is the takeoff speed, a little problem here: new-transports / controversy-over-the-air-and-children's-dreams-t16811-70.html # p446650
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Re: Release speed




by Christophe » 11/05/21, 12:16

ABC2019 wrote:if there is a push, it will move forward. The problem is that the rear-wheel drive is very unstable and with no lift from the atmosphere it might fly anyhow, rockets have sophisticated stabilization mechanisms to prevent that.


Here the X15 was alcoholic too ... like the V2:

Most of the fuselage contains a tank of 3 liters of liquid oxygen (oxidizer) and another of 914 liters of ethanol or ammonia (fuel).
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ABC2019
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Re: Release speed




by ABC2019 » 11/05/21, 12:17

Gildas wrote:Not exactly an X15 even with stabilization mechanisms to stay vertical at 100 km altitude will not advance according to Wikipedia according to the law of the speed of release or speed of orbiting.
He will '' skate in the semolina '' vertically even at full power that's what is incomprehensible!


it is you who misunderstand what wikipedia says, I have already explained to you that it applied to ballistic projectiles, not to devices equipped with propulsion!

the plane or the rocket continue to climb if the thrust is greater than g, quite simply, there is no condition on the speed.
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Re: Release speed




by gildas » 11/05/21, 17:02

A projectile can have a propulsion system:
Projectile: DEFINITIONS
Any object thrown by hand or with an instrument, and intended to achieve an objective: To be welcomed to the platform by various projectiles.
Body to which, by any means, a speed is communicated in a determined direction (bullet, shell, rocketpomegranate missile).

https://www.larousse.fr/dictionnaires/f ... tile/64229



ABC2019 wrote:
the plane or the rocket continue to climb if the thrust is greater than g, quite simply, there is no condition on the speed.

So we must overcome this speed g!
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Re: Release speed




by Exnihiloest » 11/05/21, 17:21

Gildas wrote:A projectile can have a propulsion system:
Projectile: DEFINITIONS
Any object thrown by hand or with an instrument, and intended to achieve an objective: To be welcomed to the platform by various projectiles.
Body to which, by any means, a speed is communicated in a determined direction (bullet, shell, rocketpomegranate missile).

https://www.larousse.fr/dictionnaires/f ... tile/64229

A thrown object becomes a projectile only when the thrust is complete, and that it is therefore in ballistic flight (subjected to gravity alone).

ABC2019 wrote:the plane or the rocket continue to climb if the thrust is greater than g, quite simply, there is no condition on the speed.

So we must overcome this speed g!

g is not a speed but an acceleration.

We will have to revise the basics.
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