1991 27' Fever Prop Discussion
 

Recently Purchased a 1991 27' fountain Non-step. Boat is powered with BB 509 with a bravo one 1.5 gear ratio. Currently running a 4 blade RH 24 pitch prop. Cruising speed 55 MPH at 4400 RPM. 74 MPH at 5200. Anyone else out there have prop suggestions, I am happy with the current results but have talked with some former 27' owners was going to try out a 4 blade hydromotive RH. Any Comments or prior experience with similar set-up would greatly be appreciated. Thanks!!

What brand is your prop, Mach, Bravo?

Most single engine fountains 27-29 run a LH prop. 74 is a good speed out of a straight bottom fountain.

Your numbers show a 6% slip. Don't think you'll ever get better than that. I wouldn't change a thing.

Bravo

Like ICU said, I'd take that all day long.

I run a hydro rh 24, 91 fever, 605 ulta tech, dyno 730hp bravo 1, works good, not sure how fast it will actually go as the lakes i run arent very big. Have seen 80 on the speedo at about 3/4 throttle. Old owner was an ex racer with much experience and he claimed it will run 85 in perfect conditions. This is my first boat and i dont have the experience to drive it through the chime walk to find out what it will actually do.

Also, i know im on borrowed time with the bravo 1 and my hp level, i could pull more prop but it works well enough for my needs and like i said, its my first boat. Bought it two years ago, had 231 hours on it, has 267 now.

You might try a labbed 26 otherwise you are there. I got 77 out of a labbed 28, but I had a blower . The hydromotive was ok but cavitated more than a bravo on mine., It was a 92

I've heard the same about Hydros. It was suggested to go with a P5X, but you are likely to offset top end to get the benefit of getting on plane faster. There was a post somewhere (or at least I thought it was here) that someone used a ported 27 P5x which accomplished both. I'm waiting for a response to my PM to Brett from BBlades to get his thoughts.

I have a stock 502 w/ 435 hp, stock Bravo drive and Hydromotive LH 22". Getting about 5000-51000 rpms WOT and mid-upper 60s. I tried a Bravo 23 RH and it made the boat porpoise quite a bit. Not sure how everyone is running larger props and getting into the 70s...

I would be happy with 65mph,,,,,,,,,,,,,,,,,,,,,,,

How many HP does your 509 have?

If you have the weight on your boat and propshaft HP and choose the Heavy V bottom in this calculator
You can aprox see what kind of speed you are suppose to get

http://www.go-fast.com/boat_speed_predictions.htm

93 27' with a 502mag with the 500 efi cam and valve train, 24 lh hydro the best I get is 67 and I can feel it slipping, lh bravo1 24" and I get about 71 and a better mid range acceleration and planing.....stick with what you got I don't think you can improve on that

Bigger props, lower gear ratio. Stock 496 mag ho's have a little more power than the stock 502's
I have a 496 mag ho w/ bravo 1X drive 1.65-1 ratio. 5000 RPM 5100 on a cool day 68-70 MPH with a bravo LH 30P
When it is really hot best I can get is 4800RPM
1.5-1 ratio would be the same running a 28p bravo.

Just to add My drive is a 1.36, dyno sheet 701hp@5400, 715tq@4750