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What Prop on my 1979 18'3" with a DF175
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05-13-2013, 07:57 PM
bitsamonkey
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Join Date: Jan 2008
Posts: 95
You've got some other problems. The df175 has a 2.5:1 lower unit and should easily swing at least a 20" prop. My 18' with a df90 which has a 2.59:1 lower unit ratio runs a cupped 18" prop to 6300 rpm.
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