Need help with identifying a prop

dave8n1

Cadet
Joined
May 27, 2016
Messages
8
Back with my 86 Imperial- Thinking of replacing my prop, Kind'a banged up. I'm not sure how you read these numbers stamped on the prop (See pic)
I'm also not sure if this is the correct prop for my boat, Is there a rule of thumb I can go by? My boat is a 1986 Imperial V-8 230 horse 20' open bow.
As always thanks
dave

imperial1_zpsmg3aqtdz.jpg



F L P
The # on the prop is : 48 78122 A4L 21P
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Does the boat perform as you would like? 21 is the key dimension.
The theoretical inches forward in one revolution.But usually about 12% slip makes
it somewhat less.The higher the number (21) the harder to turn but may produce the most speed.
 
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