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What Determines The Proper Spinner Size?

AKfreak

150cc
I have been researching and have found some varying information. First I hear for an aerodynamically sound spinner it is supposed to be 1/5 the diameter of the prop, then I hear it's all about the size of flat spot the cowl?

Also I notice some spinners are short and stout looking, some are long and pointed. I need two spinners, one for a 16x7 prop, and one for a 20x8. I have had good luck with Tru-Turn in the past, but I had a spinners that I was replacing. This time I have no information to start with.
 
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