Help With Urgent Aero Question - Show Me the Workings

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Discussion Overview

The discussion revolves around a specific aerodynamics problem related to calculating true airspeed, focusing on the need for static pressure to solve the question. Participants explore the relationships between total pressure, static pressure, and various airspeed calculations.

Discussion Character

  • Homework-related
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant expresses urgency in needing help with an aerodynamics question, specifically mentioning the lack of static pressure as a barrier to solving it.
  • Another participant emphasizes the importance of showing one's attempt at the problem, suggesting that listing known variables and equations could facilitate assistance.
  • A participant proposes a formula for true airspeed that requires static pressure, noting that only total pressure is provided.
  • There is a suggestion that pressure altitude could be used, implying it may be derived from existing equations.
  • A participant inquires if there is a formula linking pressure altitude to static pressure, expressing uncertainty about their understanding.
  • One participant shares a link that may provide useful information, although they note that the equation discussed is similar to what has already been mentioned.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to proceed without static pressure, and multiple viewpoints regarding the use of pressure altitude and available formulas remain unresolved.

Contextual Notes

The discussion highlights the dependence on static pressure for various calculations, and the participants express uncertainty about the relationships between pressure altitude and static pressure.

Who May Find This Useful

This discussion may be useful for students or individuals studying aerodynamics, particularly those encountering similar problems related to airspeed calculations and the role of static pressure.

lauraosborn
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Urgent Aero question help!

I can't seem to do this question without the static pressure given.
Can someone show me the workings and how it is done?

I can't seem to do this question without the static pressure given. Can someone show me the workings and how it is done? Question >> hxxp://postimage.org/image/cp3w7a7jl/
 
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Rules is rules, you've got to show your attempt. What have you tried. List your knowns, your equations, etc. Then we can help fill in the missing pieces.
 


formula i am thinking of using is True air speed, V^2= (2a^2)/(1.4-1) x [(total pressure/ static pressure)^((1.1-1)/1.4) -1]

but since only total pressure of 84.2 KPa is given, i cannot get the true air speed without static pressure. and other formulas for equivalent airspeed and calibrated airspeed also needs static pressure to calculate
 


You know the pressure altitude, though, no? That number comes from an existing equation.
 


erm, is there a formula that links the pressure altitude to static pressure? (sorry if i sound dumb >_<)
 


Check this link out

(Oops, looks like your equation is the same anyway, either way, it's a good link).

As far as the static pressure goes, here's a good estimate: Engineering Toolbox
 


will do, thanks a lot for your help
 

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