- #1
Melissa P
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- TL;DR
- Hi!
I´m going to calculate the Mean Aerodynamics Chord MAC but I need the distance of the line in red
How can I calculate?
Please!
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Discussion Overview
The discussion revolves around calculating distances related to the Mean Aerodynamic Chord (MAC) of an aircraft wing. Participants explore geometric methods and seek clarification on specific lines in a diagram related to the wing's dimensions.
Discussion Character
- Exploratory
- Technical explanation
- Homework-related
Main Points Raised
- One participant asks for clarification on whether the question pertains to a specific aircraft wing and if it is for schoolwork.
- Another participant indicates the need to find a specific distance to solve for the MAC, emphasizing that the values are not real and geometry should be applied.
- A participant seeks to clarify which red line in the diagram is being referenced, suggesting it could be the one labeled "cuerda de raiz fisica" or possibly a blue line instead.
- One participant asserts that there is insufficient information to find the length of the "cuerda de raiz fisica" line but suggests that the blue line can be determined with a geometric approach.
- A later reply proposes a geometric method involving the centroid of each section of the half-wing to find the equivalent MAC for the whole half-wing.
Areas of Agreement / Disagreement
Participants express differing views on which specific line needs to be measured and the sufficiency of the provided information. The discussion remains unresolved regarding the exact distance needed for the MAC calculation.
Contextual Notes
There are limitations regarding the clarity of the diagram and the specific lines referenced, which may affect the ability to provide a definitive answer.
- #2
berkeman
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Welcome to PhysicsForums. 
Is that wing from a particular aircraft? If so, you can probably find the dimensions online somewhere.
Is this question for schoolwork? If so what is the full problem statement. If not, what is the application?
Is that wing from a particular aircraft? If so, you can probably find the dimensions online somewhere.
Is this question for schoolwork? If so what is the full problem statement. If not, what is the application?
- #3
Melissa P
- 2
- 0
no,I should find this distanceberkeman said:Welcome to PhysicsForums.
Is that wing from a particular aircraft? If so, you can probably find the dimensions online somewhere.
Is this question for schoolwork? If so what is the full problem statement. If not, what is the application?
The values aren´t real. Geometry should be used
This is a example for a wing.But,I need that distance to solve the MAC
- #4
DaveC426913
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There are quite a few red lines in that diagram.Melissa P said:
Are you referring to the one labelled cuerda de raiz fisica?
Alternately, is it possible you need to find the length of the line in blue?
Last edited:
- #5
mfb
Mentor
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There is not enough information to find the length of the "cuerda de raiz fisica" line, but there is enough information to find the length of the blue line. Drawing a vertical line down from its left end can help.
- #6
Lnewqban
Homework Helper
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Welcome, Melissa!Melissa P said:
There is a geometric method that you could use, first locating the centroid of each section of the half-wing, where the MAC of each section is located at, then finding the MAC that is equivalent for the whole half-wing.
Please, see this example:
https://www.rcuniverse.com/forum/9511096-post34.html
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