These aircraft were originally created for FS9. Some can be partially fixed by tweaking the Alpha channel of the prop texture. I've sometimes fixed it by using prop textures from aircraft that do display correctly. Even if it works it won't cure the display priority problem with the clouds & autogen scenery.

Some of these aircraft might have already been fixed. Have a search round for tweaks & updates for the ones you have problems with.

I've Swapped Prop Texture files with different aircraft before and got it to work.  What your going to be looking to swap - is usually called PROPBLURR texture file , within the aircrafts Texture Folder it self.  Your best bet is to get the FREE Add on' DXT BITMAP Manuiplator - try googling it,,, with that you'll be able to actually open up the bitmap texture file and see the file and also, what texture Format it is saved as, rather it be a 256 color bitmap or some other style format, sometimes changing it to another style bitmap will Correct the PROPBLURR  file. hope you understand all this - if NOT just come on here and ask for more help , we don't mind :) !!