Need help in pilot eject system

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Discussion Overview

The discussion revolves around the design of a pilot eject seat system for a British Aerospace jet, specifically the Hawk (MK 108 & 208). Participants explore the requirements for simulating the ejection process using numerical methods and MATLAB, focusing on the dynamics and kinematics involved in safely ejecting a pilot from the aircraft.

Discussion Character

  • Homework-related
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant questions whether the original poster has researched how ejection seats function and if they are attempting to build a mathematical model based on the provided specifications.
  • Another participant expresses concern about the safety implications of ejecting at Mach 1.1 and the potential harm from a maximum acceleration of 22g, suggesting that pilots are typically trained to withstand about 10g.
  • There is a suggestion to consider the pressure as a function of wind velocity during ejection, particularly at low altitudes.
  • Participants recommend conducting further research, pointing to resources such as Martin-Baker's website and specific case studies on human tolerance to ejection forces.
  • The original poster clarifies their need for assistance in using kinematic and dynamic theory to simulate the ejection process in MATLAB.
  • A later reply humorously interprets the original request as asking for help with homework, implying a need for self-directed research.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the safety and feasibility of the proposed ejection specifications. There are multiple viewpoints regarding the implications of the specified acceleration and speed, as well as the necessity for further research.

Contextual Notes

Limitations include the lack of detailed assumptions about the ejection mechanics and the potential variability in pilot tolerance to acceleration forces. The discussion does not resolve the technical challenges posed by the specified parameters.

ukmmalaysia
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URGENT need help in pilot eject system

i am an undergraduate from a university. we are now working on an assignment on design a system of jet eject seat. and we need to use the numerical method and MATLAB program to simulate the result. well, hope you all might help us, suggest us, help us in solving this problem..

"""
an British Aerospace jet - Hawk (MK 108 & 208), need an eject seat system.

the eject seat need to fulfill the following spec.

the jet flying angel = +/- 30 degree
the maximum high of the ejected seat = 0.03 - 0.125km
the distance of the ejected seat landing from the jet = 0.10 - 0.25km
speed of the jet = mach 1.1
seat mechanism + max load = 110kg
the maximum acceleration to eject the seat = 22g

we need to find out a system to safely eject the pilot from the plane
 
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I'm not sure what exactly you are asking for. Starting from the beginning, have you done any research on how ejection seats work? Are you just trying to build a mathematical model from the given data? You have the load and acceleration...
 
Sucked in by a good thread subject. I thought the msg body was going to say:

"Do I cross arms and pull, or pull and THEN cross arms? If anyone could respond in the next... 12 seconds... it would be REALLY appreciated."
 
ukmmalaysia said:
the maximum high of the ejected seat = 0.03 - 0.125km
the distance of the ejected seat landing from the jet = 0.10 - 0.25km
speed of the jet = mach 1.1
the maximum acceleration to eject the seat = 22g

we need to find out a system to safely eject the pilot from the plane

22g might kill a pilot - IIRC, they are trained to about 10g. Try this reference - http://hypertextbook.com/facts/1998/PhillipAndriyevsky.shtml - but corroborate with another reference.

Ejecting at Mach 1.1? Especially at 0.03 - 0.125 km. That could be harmful if not fatal. One might wish to determine the pressure as a function of wind velocity.

That distance from the jet is a bit tricky (especially if it tumbles) - the jet will go where it goes, and hopefully the ejection seat does not follow it.
 
Last edited:
thanks 4 ur comment... however wat we need is using the kinematic n dynamic theory to simulate a curve with the given specification by using the MATLAB which relate to numerical method. Hope u all can give ur precious opinion...
 
If one translated that, I believe you would find it means: Could someone please do our homework?
 

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