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Old 29 June 2015, 04:03   #1
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Country: Finland
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Valiant 470 sport and mercury 40hp efi

Hi all,

I think my engine has too small prop. It takes the max rpm so fast even if i have 5 person on board. The max rpm is now about 6200rpm which feels way too much. The speed is with max rpm only 23knots. What kind of prop u guys think i would need to fix this?
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Old 29 June 2015, 04:46   #2
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Country: Ireland
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Make: Valiant DR 490
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Engine: 60 hp ETEC
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RIBase
You will need to give details about the engine for a reply to be made.
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Old 29 June 2015, 09:02   #3
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Quote:
Originally Posted by two stroke mick View Post
You will need to give details about the engine for a reply to be made.
Mercury FourStroke 40 EFI 3-cyl. model 2012
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Old 29 June 2015, 10:58   #4
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and your current prop size.??? it really is a trial and error job.but as a pure guess something like a 10.5x14 ish
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Old 29 June 2015, 15:13   #5
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Click image for larger version

Name:	ImageUploadedByRIB Net1435605139.756654.jpg
Views:	90
Size:	86.7 KB
ID:	106487 this is all the information of the current prop that i can find
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Old 29 June 2015, 15:23   #6
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What about the top speed, am I just dreaming to get over 30knots with this combination?
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Old 07 July 2015, 10:17   #7
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Okay so the pitch of the propeller was 11 and tested 14 one week ago snd it was too big cause the top rpm went under 5000. Now got the P13 propeller and will test it on saturday so we will see how it works!
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