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Irak, the prop on the 9.9hp is a 10x9 4-blade prop, so I would think this is a great thrust prop. The 6hp had a 8.5x9 three blade prop. The blades on the 6hp are much different than the ones on my 9.9:

9.9hp: http://img39.imageshack.us/img39/6037...99prop.jpg

6hp: http://img231.imageshack.us/img231/20...hpprop.jpg

Here is a pic of the 6hp at work:

http://img24.imageshack.us/img24/7541...ertest.jpg