RCU Forums - View Single Post - Prop Size for OS 91FS Four Storke on H9 P51
Old 08-31-2005, 11:43 AM
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Richard L.
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Default RE: Prop Size for OS 91FS Four Storke on H9 P51

13.5x8, 14x7, or 14x6, which ever gives you a ground rpm of around 9500. The 13.5x8 prop will give you the most speed at the expense of diameter.