im sure this has been posted before but whats the main difference between colorado and willow blades?

colorado blades keep the bait shallower and vibrate more than willow blades.

In a nutshell:

Colorado blades have a rounded shape, give you more lift so that you can swim the bait slower and still keep it higher in the water column, and they create more of a thumping vibration.  This vibration makes these the blade of choice in highly stained conditions where visibility is poor as the vibration helps the fish to find the bait.

Willow leaf bades are shaped like . . . you guessed it, a willow leaf.  They don't provide as much lift.   Their longer shape creates more flash, and some believe the combination of the spinnerbait body and the two willowleaf blades simulate the action of a couple of shad with a slightly larger baitfish below.  These are used in lightly stained to clearer water.  

Indiana blades are in between with more of a tear-drop shape.

I have looked at a lot of articles on spinner baits blades. From my testing in a swimming pool, I have a different take on spinner bait blades.

Willow leaf  blade has a lot of flash and I agree with what has been said.

Colorado blade puts out a lot of thump and gives the bait a lot of lift.

The Indiana blade- all of the articles I could find when developing Spinnerbaits state that it is in between a willow and colorado. But from my testing, an Indiana will put out more vibration that can be felt on the fishing rod than a standard Colorado. I use a bait that has a #5 deep cupped Colorado blade but have tested a #5 Indiana blade. You can feel the thump in the rod better with the Indiana blade, but seem to catch more fish on the #5 Colorado. If anyone has heard of a Pickens blade (a blade used for years in east Tennessee), it produces the most rod thumping vibration and is close to the Indiana blade. Does anyone else agree with this? I understand that blade thickness and cup, split ring hole location, and other factors can influence the vibration.

Any good places to buy blades online?

Any good places to buy blades online?

Let 's get this straight right here right now, by no means I assume any responsibility, I 'm just a mere instrument if IT 'S will, ok ?

www.staminainc.com

www.barlowstackle.com

Difference is the amount of water they move and the resistance to the water. Colorado blades will create more vibration than the willowleaf blades. I use the colorado in offcolor water and the willowleaf for clearer water. I also downsize the willowleaf blades in clear water. You can pull it through the water faster creating a less visable target for the fish. You do not want them getting a good look at it as they tend to realize it for what it is, a fake.