free propeller efficiency (analytic) 1

[Vinc84]

Hi all,
I'm looking for an analityc formulas that describe the propeller efficiency (eta) function of the variables J=v/nd and propulsive coefficient cp (renard). In particular i have to do with a McCauley costant speed propeller the one mounted on piper pa28r.
Thanks all in advance i hope u can help me

 

[IRstuff]

Is this for school?

TTFN

FAQ731-376

 

[FranAle]

Check the Roskam'series books, they have good plots and data for propellers. I hope this works for you.

FranAle

 

[PBPouw]

Not much has changed on subsonic propellor design since WW2.
The old NACA reports are still valid.

See :

http://naca.central.cranfield.ac.uk/reports/1938/naca-report-640.pdf

Or :

http://naca.central.cranfield.ac.uk/reports/1938/naca-report-642.pdf

( Propelor efficiency in the presence of a nacelle )


Pim

 

[Vinc84]

Thank for ur replies.
Yes it's for college, i have to implement a program with matlab to calculate performances of g.a. airplanes, depending on airplane geometry and propulsive characteristics, like the AAA program of darcorp.

 

[Vinc84]

I've read the policy of the fora, sorry about this post, I didn't know that students cant post.
Anyway thanks for the help. I hope to be graduate in June so i could post for work issue.