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Old 24 September 2006, 14:14   #1
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Country: UK - England
Town: Newcastle Staffs
Boat name: blue it
Make: ribcraft 7.5
Length: 7m +
Engine: suzuki df225
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proping a df 140

need some views on proping my df140, I used to run at approx 6200 revs,
pulling 45/46 Knotts, this is with the original 3blade 14x21 ally prop. after adding another100 litres of fuel and a auxillary, im now pulling 39 knotts at
6000 revs, what prop would you go for to try and get some more top end,
apart from the drop of top end the ally prop behaves satisfactory.
I allso have a laser 2 stainless prop, 14x19 4.25 15 spline, would this prop be suitable, as reducing the pitch should give me the extra revs. or failing that
has anybody got a suitable stainless prop theyre selling. pref new.cheers.
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Old 24 September 2006, 15:30   #2
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39 knots @ 6000revs is within the top end margin of 5800 to 6200 revs. I pull just on or 40knots at the same revs, and I have a 21" prop.

If you read around the forums, I don't think you'll get much more speed out of the engine on your boat (46knots that you were having before sounds pretty high for the DF140!!). If you change to a 23" prop for example, the revs will drop probably below 5800revs, and you may end up being slower. Decreasing to 19" would give you better acceleration, but to be honest, the change probably isn't worth it.

-Alex
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Old 24 September 2006, 15:37   #3
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Having wasted money in the past on props for the sake of a couple of knots, I would say your current prop is spot on .
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Old 24 September 2006, 16:52   #4
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Cheers guys, pretty much as i thought, the main reason to change is that last time out i put a small dent in the ally prop, so need to get it repaired.I really need a spare,so thought i could kill two birds with one stone. are you running the original ally prop or stainless. cheers
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