Typical surface roughness heights for aircraft surfaces

[JaWolf]

Hello!
I am investigating some preliminary aerodynamics on a regional turboprop and for the drag model the surface roughness height of the airplane is required as an input. For this i do not have any data. In which range are the typical values for modern aircraft surfaces?
Thanks a lot!

 

[berkeman]

Welcome to PhysicsForums.

I did a Google search on aircraft surface roughness height and got lots of good hits. Have you tried that search yet?

Hit List: https://www.google.com/search?client=firefox-b-1-d&q=aircraft+surface+roughness+height

Including: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821304/

https://www.researchgate.net/publication/256469422_Surface_Roughness_Measurement_on_a_Wing_Aircraft_by_Speckle_Correlation

 

[boneh3ad]

Hello!
I am investigating some preliminary aerodynamics on a regional turboprop and for the drag model the surface roughness height of the airplane is required as an input. For this i do not have any data. In which range are the typical values for modern aircraft surfaces?
Thanks a lot!

Typical surface roughness: "As built"

I am curious what kind of model takes this into account, as its primary effect is on boundary-layer transition, but the relationship between the two is extremely complicated. Also, as a typical airplane flies around, it accumulates dirt and grime from weather and bug strikes, so the as-flown surface roughness changes over time and is going to be different from the as-built surface roughness.

 

[Ranger Mike]

in Search bar type in surface texture
posted by Ranger Mike
i have written much on this subject
merry Christmas