How Can I Calculate Thrust as an Airspeed Function for Propellers?

  • Thread starter Thread starter Cerpin Taxt
  • Start date Start date
  • Tags Tags
    Propellers
Click For Summary

Discussion Overview

The discussion revolves around calculating thrust as a function of airspeed for propellers, including considerations of pitch, diameter, horsepower, and air density. Participants explore both empirical and theoretical approaches to this problem.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about calculating or plotting thrust as a function of airspeed, suggesting that factors like pitch, diameter, horsepower, and air density may be relevant.
  • Another participant suggests that for a standard propeller, empirical data can be used for interpolation or curve fitting, and provides links to various resources for further exploration of theoretical models.
  • Additional resources are shared regarding the relationship between RPM, pitch, diameter, and power, indicating that these relationships may also be explored through empirical data and reports.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific method for calculating thrust, and multiple approaches, including empirical and theoretical models, are discussed without resolution.

Contextual Notes

Limitations include the dependence on empirical data for specific propellers and the potential variability in results based on different models and assumptions made in theoretical analyses.

Cerpin Taxt
Messages
7
Reaction score
0
Does anybody here knows how can i calculate (or plot) the Thrust as an airspeed function?

I guess it'd be something related with Pitch, Diameter, HP, air density...

Or... a way to calculate RPM as a pitch, diameter and power function?

thanks!
 
Engineering news on Phys.org
Welcome to PF, Cerpin. I can't help with this, but others here can. Be patient and they shall appear. :biggrin:
 
Last edited:
thanks!


!
 
Complicated question. The simple answer is, for a
standard propepper which has been empirically analyzed,
look up the values in a table and then your equation is just
interpolation or curve fitting of the actual measured values
applicable to your particular propeller and circumstances.

For more analytical, theoretical, or mathematical models
that try to explain ab initio what effect airspeed has on
thrust of a given propeller, see the following for starters;
it's interesting to see what simplifications are made in
various models, as well as how the model results compare
with empirical data.


http://wright.nasa.gov/airplane/propth.html
http://www.aeromech.usyd.edu.au/aero/propeller/prop1.html
http://www.gylesaero.com/freeware/propcalc.shtml
http://www.jefflewis.net/aviation_theory-theo_prop_eff.html
http://www.epi-eng.com/Prop-Selection.htm
https://www.physicsforums.com/archive/index.php/t-12827.html
 
Last edited by a moderator:

Similar threads

  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 7 ·
Replies
7
Views
7K
Replies
7
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 24 ·
Replies
24
Views
4K
  • · Replies 5 ·
Replies
5
Views
6K
  • · Replies 5 ·
Replies
5
Views
8K
  • · Replies 104 ·
4
Replies
104
Views
13K