ORIGINAL: airraptor

Ok here is the first result of my search on the net.

http://www.ae.illinois.edu/m-selig/props/propDB.html

http://soar.wichita.edu/dspace/bitst...773/t05031.pdf

http://dc.library.okstate.edu/cdm/si...id/2757/rec/14

https://netfiles.uiuc.edu/kotwani2/w...apers/FMFP.pdf

http://etd.auburn.edu/etd/bitstream/...pdf?sequence=1

this should be enough reading for you for now. It will explain how the constants were derived. Use this data to set up the calc with different props. then use a known prop in the calc on a engine that will run that prop at that rpm. then base other props on the same engine to get a general idea what the contant should be for that prop. this will work on any prop close to the same rpm as the ''known'' prop.