You're going to have to add this to the .blk:
replace_tex{
from:t="4_blade_fast_propmask*"
to:t="spitprop.tga"
}
Replace the 4 in "4_blade_fast_propmask" with the number of props
that the plane you're trying to add this to has.
You're also going to have to add this:
replace_tex{
from:t="black_slim_yellow_rottex*"
to:t="black_slim_yellow_rottex.tga"
}
This only works for allied props that have yellow tips.
To find the right line of text to use in your plane, open the
asstes viewer, then look under GameRes/ Aircrafts.
There will be a list of "rottex's" to choose from.
Just find the one that best describes the color of your plane's
prop and replace the "black_slim_yellow_rottex*" line with the
name of this file.
This will take a bit of trial and error!