Im changing from a 4 blade fan to a 6 blade. I noticed that the new fan has bent tips on the ends of the blades. Are these tips supposted to be bent towards the engine side or towards the radiator side? Presently I have them pointed to the engine side but it feels like the air is blowing out the sides of the fan instead of to the engine, yet if I put paper in front of the radiator, it will draw the paper in. I am currently having a over heating problem. The 6 blade fan is from a a/c mopar. Thanks
Could you take a picture of your bent tip fan and post it?
Are the tips at the outer edges, or running radially from inner to outer?
The steel flex fans have the radial running edges to "feather" the blades at higher rpm.
Back in the 1980s i had propellers for a Navaho airplane with the custom bent tips at the ends.
It sure drew strange looks at airport fueling stations.
I believe your bent tips need to point toward the radiator.
The bent tips are there to block high pressure air underneath the fan blades rushing up to the lower pressure air region above the fan blades.
This bladetip air movement creates little tornadoes at the tips that are parasitic power wasters and noise producers.
The vertical "winglets" at the end of commercial airliners are the same idea.
