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I have two viper props. One of them is a 19p with vent holes and the other is 21 P without vent holes. Can anyone tell me why this is.
Thanks in advance for any replies.
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These vent holes, which are behind each blade, are designed to help your props hole shot. When beginning to accelerate these holes allow some of the exhaust bubbles to flow through and flood around the blades. This allows the prop to spin through more turbulent water, which allows a faster hole shot. Once up and running the exhaust will bypass these holes and shoot straight out.


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