Offshoreonly.com - Need some prop help

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Quote:

Originally Posted by Blackmagic94 (Post 4576437)

It's at 16. How did you get 20

Hitting rev limiter is 5350 rpms @ 70mph. with 1.5 ratio and using 25.5 for pitch =19% slip.

Well he said 5300 rpm at 73mph not 70 and 26 pitch. And even if the case 19 isn't 20 lol. Either way there is room to improve the setup. He is complaining about the hull but there is a lot room to improve on the prop.

Would hydromotives work better on those hulls then bravos? I know fountains were faster with them

just got a new pair 30s to run. haven't opened it all the way up but been around 80 with more to go and at 3600 was running 60 no hop or tab. have 720+ a side but very deep with TRS.

Theoretical speed for the numbers he provided is 86.994. his speed is 73 MPH sorry its 19 % not 20%

really need to now how the boat trims with the 30s or the 26s that will help with the prop selection and blade style and then give it to Augy and he will make the perfect prop.

Quote:

Originally Posted by Blackmagic94 (Post 4576443)

Re read his first post.
Bravo 1 props stamped pitch is rated 1/2" to 1" more than actual pitch. Rev limiter on a 525EFI is at 5350 rpms.
Fountains like hydromotives(Q4's) because they have stepped hull that doesn't need bow lift.
Rev limiter on a 525EFI is at 5350 rpms.

Quote:

Originally Posted by black thunder 46 (Post 4576300)

I was wondering where I should start with prop testing? The boats a 1989 31 bullet (knotched transom) with stock Merc 525 EFI's. right now the drives are stock brovos but I'm just not seeing good speed at all out of it I haven't found a good prop. So far the boat has done 73 with a set of 5 blades (can't remember pitch but I think they were 28's). Currently it has 4 blade 26's but it hits the rev limiter immediately and will run 70. I was wondering what other people with similar hp have seen speed wise and what drives they have? I'm thinking I am going to need XR's with 2" shortys but want to see what other bullets have before pulling the trigger.
Thanks

Brett, for reference, 32 AT's with HP500's run stock 28 Bravo's or labbed 30's.

Actually only early fountains had q4s and some early ones where straight bottoms. It wasn't until mercury bailed out Reggie that he had to switch to all mercury parts and they had to raise the x to use the bravos and were typically slower

Thanks for all the help! The boat does need more bow lift it rides pretty flat in my opinion. I would also like to know if hydromotices would work. I am searching for 4 blade 28's to run but I came across a set of 4 blade 29 hydromotices anyone know if those would work?

Quote:

Originally Posted by Team Archer (Post 4576507)

Theoretical speed for the numbers he provided is 86.994. his speed is 73 MPH sorry its 19 % not 20%

what do you mean?

Text u Brett. Go steal the labbed 28s off my boat if you need or I'll bring the other set next week.