Release speed

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Ahmed
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Re: Release speed




by Ahmed » 10/05/21, 22:43

Yes, it is heading vertically (sic) but it is not going in a straight line (hic!)!
: Wink:
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Obamot
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Re: Release speed




by Obamot » 10/05/21, 22:44

We got a new one there :?:

GILDAS You say incoherent words ... You told us about the MIG ... to go to 1'000 km altitude : Mrgreen:

The fastest is the MIG 31 at Mach 3 + ... the cabin is so hot you can cook steak on the windows (authentic)

There you give 28 km / h ... there will burn your MiG : Mrgreen: : Mrgreen: : Mrgreen: disintegrate in flight
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gildas
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Re: Release speed




by gildas » 10/05/21, 23:03

Obamot wrote:We got a new one there :?:

GILDAS You say incoherent words ... You told us about the MIG ... to go to 1'000 km altitude : Mrgreen:

The fastest is the MIG 31 at Mach 3 + ... the cabin is so hot you can cook steak on the windows (authentic)

There you give 28 km / h ... there will burn your MiG : Mrgreen: : Mrgreen: : Mrgreen: disintegrate in flight

Didn't I say 28 km / h and 000 km of altitude is a goal to achieve but impossible at Mach 1000 or 2?
science-and-technology / liberation-speed-t16840.html # p446502
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GuyGadeboisTheBack
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Re: Release speed




by GuyGadeboisTheBack » 10/05/21, 23:14

Gildas wrote: If a Mig takes off with oxidizer and fuel in order to leave Earth to go into space at an altitude of 1000km ...

Already can not because at around 100 km altitude, there is not enough lift for the flight of an airplane.
The plane of all records launched in flight by a bomber specially designed for, and not from the ground:
It was the X-15A-2 which set the speed record by reaching 7 km / h on October 272,68, 3. However, during this flight, the surface temperature exceeded the expected 1967 ° C and caused significant damage to part of the cell. Although North American refurbished the aircraft, it ultimately never got back to the air.

https://fr.wikipedia.org/wiki/North_American_X-15
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Re: Release speed




by gildas » 10/05/21, 23:28

GuyGadeboisLeRetour wrote:
Gildas wrote: If a Mig takes off with oxidizer and fuel in order to leave Earth to go into space at an altitude of 1000km ...

Already can not because at around 100 km altitude, there is not enough lift for the flight of an airplane.
(...)

Bof, a Mig 29 with conventional fuel manages to take off vertically ...


There is no lift once vertical ...
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Re: Release speed




by GuyGadeboisTheBack » 10/05/21, 23:33

(Oh yeah anyway.... : roll: )
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Re: Release speed




by Obamot » 10/05/21, 23:54

(yeah, he can justify that one : roll: )

1) Old photographer's trick, the trajectory is not absolutely vertical, but from behind you are wrong. and
2) MIG reactors, like any other, use proximity to the ground to boost take-off thrust.

Of course, as soon as it's done, the pilot cuts the engine and goes and tell you, no need, there's no air : Mrgreen: : Mrgreen: : Mrgreen: : Mrgreen: : Mrgreen: : Evil:



It has become a habit in the press demos.

This guy is happily smoking us up.
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GuyGadeboisTheBack
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Re: Release speed




by GuyGadeboisTheBack » 11/05/21, 00:06

Ahmed wrote:
Yes, it is heading vertically (sic) but it is not going in a straight line (hic!)!
: Wink:

We crossed the wall of the drunk, there!
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ABC2019
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Re: Release speed




by ABC2019 » 11/05/21, 06:24

Gildas wrote:
To overcome the gravitational force and not fall back to Earth, Saturn V must reach a speed of about 28 km / h. To achieve this, the launcher essentially consists of three powerful reactors as well as a suitable fuel tank. These stages are successively ignited and then dropped once consumed. The actual Apollo spacecraft sits at the front at the tip of the rocket. 000 minutes after takeoff, Apollo 12 reaches orbit and circles the Earth one and a half times. In this “parking orbit”, the crew controls all the systems again, then the control tower gives the instruction: “Go!”. The third-stage reactor then ignites and sends Apollo out of Earth's orbit at a speed of 40 km / h towards the Moon. Now, Apollo 11 flies on a "free return path": even if the reactors failed, the spacecraft, after having made a loop around the Moon, would again be attracted by Earth's gravity and would find its way back to Earth. our planet.

https://m.simplyscience.ch/archives-jeu ... terri.html


it corresponds to what i said, the release speed must be reached where we stop the push and that the flight becomes ballistic. 28 km / h is the release speed at the altitude where the engines ceased to thrust, but Saturn V never reached 000 km / h.

But as Guy said, on the one hand planes are not built like rockets and need lift, on the other hand they do not carry enough fuel to reach the altitude + speed combination required for the exhaust. which in practice is only feasible if mass is dropped along the way, hence the system by releasable stages.
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Re: Release speed




by gildas » 11/05/21, 08:19

Hello,
The 40000 km per hour have yet been approached
Screenshot_2021-05-11-07-42-25-316_com.android.chrome.jpg


But my question remains open:

What happens to a rocket plane when taking off vertically at 50, 80 or 100km altitude at Mach 2 or 3 ???

If the engines deliver power for Mach2 or 3 at 50, 80 or 100km altitude why would the rocket plane not move forward? : Shock:

At what altitude would the rocket plane stop?
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