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#1
08-24-2006, 12:02 PM
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Inboard prop size
I have been doing a search on proper prop size for the 23' inboard and was wondering what prop Miles offshore ended up with or any other suggestions. Is the correct prop a 16 x 17 with a # 5 cup? I bought my boat with the 4 blade and it is a dog. 17 knots burning 12 gph. There is no cup but after reading the post, I guess I need to trash the 4 blade and get a 3 blade. I have an old 17 x 17 3 blade I have as a spare. Can I use the 17 x 17 with say a #3 cup to get the same results as the 16 x 17 # 5 cup? I AM SO CONFUSED!!!
 Classic Trade 
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#2
08-24-2006, 12:32 PM
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Re: Inboard prop size
I forgot to say that I have the 351 ford engine in the boat and I believe it is aroung 250 hp. Thanks for the help.
Classic Trade
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#3
08-24-2006, 10:15 PM
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Re: Inboard prop size
Hey Author???- I am now turning a 16/15 old ragged spare wheel- the 4 blade was a dog for sure and i would be happy to sell it to any interested party
I am going to by a 16-17 soon and that is what i plan on running- no cup- your wheel sounds fine (the 3 blade) make sure your rpms max out in the 42-4800 range and you should be fine- With lite fuel and the 3 blade i am burning 9 gph and getting 20 to 23 knots depending on tide/fuel etc with 2 people. hope this helps-
__________________
"Lifes too short to own an ugly boat"
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#4
08-25-2006, 02:16 PM
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Re: Inboard prop size
Thanks for the reply. I am planning on posting pictures of my 23 but I am so computer stupid, I am not quite sure how to do it. So I need no cup with the 17x17? I thought a cup was good for the seacraft inboard. I know it is needed in football.
 Arthur
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#5
08-25-2006, 03:02 PM
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Re: Inboard prop size
Miles offshore,
I'm getting around the same speed numbers as you, but I'm burning just a touch more at 10-10.5 GPH. what RPM are you getting that cruise at. I'm at around 3400 and swinging a 15x17 prop. This is also with a new EFI 350 rated at 350hp. I was hoping for a better cruise with that power. Any suggestions?
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#6
08-25-2006, 09:05 PM
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Re: Inboard prop size
R/R- you should be doing a heck of a lot better than that I think- you have quite a bit more horses than i do- how many rpms is it turning wide open??? I think you might be under propped a little- i think all that extra hp acounts for the little bit extra fuel consumption (maybe) . I normally run between 3K and 3200.
hey Auther- been waiting a while to see pix of your ride!!!! craig
__________________
"Lifes too short to own an ugly boat"
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