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Old 10-27-2019, 05:07 PM   #1
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Default Prop questions

I am looking to get new aluminum props for next season. I have 18 3/4 by 21 props on there now on my 01 3000 scr 5.0L carbs bravo 2 outdrives. They work very well but I think that they are worn out. Original equipment.

My first question is: how close to the original diameter (18 3/4) do I need to get to. It seems like I see 17 3/4 alot or even 18 1/4. I am happy with the 21 pitch.

I have found a store on line, The Delta Prop shop in Cleves Ohio that is close and prices are reasonable as a possible store to buy from.. Any suggestions in a make or manufacturer or prop shop that you know of or recommend?

Thanks
Roger
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Old 10-27-2019, 05:57 PM   #2
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IMO if you go with the 18 1/4 and 21” pitch you shouldn’t see much change in performance. I would go this way instead of the 17 3/4.
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Old 10-28-2019, 02:52 PM   #3
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For Prop diameter sizing you want the space between the anti-ventilation plate and the tip of the prop blade to be 15% -20% of the prop diameter (20% being ideal). I'd start with how much you have now and calculate what that value with be with a different diameter prop.

18.75 x .15 = 2.8125"
18.75 x .20 = 3.75"

17.75 x .15 = 2.6625"
17.75 x .20 = 3.55"

Decreasing diameter may impact performance similarly to decreasing pitch. 1" of diameter is not insignificant.
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