Throwing Knives

So, you want to learn how to throw knives? It pays to start with good equipment. The most important thing is to use knives made for the purpose. They should be neither too heavy or too light.

Choosing a knife. The type of knife you choose will have an incredible impact on how much you’re able to enjoy knife throwing. Keep in mind that quality throwing knives do not have a handle. The blade is the throwing knife.
▪ Size: Knives that are between 12”-16” are a good size. They aren’t too big and not so small that you’d have to throw harder and strain to watch them in flight.
▪ Weight: Knives of the above size will fly fairly undisturbed from wind and make a satisfying sound when they hit the target.

more at http://www.articlesbase.com/extreme-sports-articles/knife-throwing-so-you-want-to-be-a-knife-thrower-470112.html

I ordered a set of 11 ounce Pro Flight throwing knives from The Great Throwzini and they seem just right. (Earlier, I bought a set of lighter knives from a different vendor and they just didn't have much sticking power and just seemed harder to throw.)

You should spend time thinking about the target. Soft pine works much better than a plywood sheet. The plywood is pretty hard so getting a consistent stick can be difficult.