Terry - whatcha running in that 29?

I've got a 1998 29 w/ a 525SC with an aftermarket (smaller) upper pulley (7lbs boost). Love the boat, just haven't got the performance (i.e. top end) that I wanted.

I switched to an IMCO SC upper and 2" shortie and run a Bravo 30 that has been rolled back a bit. The shortie helped the hole shot and gave the boat alot better attitude... but I'm still only reaching 74 - 75mph GPS...

Tried a Hydro 5 blade and 6 blade - planed off easier but lost some on the tope end...

Why do you keep losing blades on the 28B's

 

but I'm still only reaching 74 - 75mph GPS...

I only have a 27, witha 500HP carb... I got 74.3 5300 rpm's with a hydromotive 25 4 blade... Stock boat... I have always read the the 29 with a 500HP will hit 73-75...

I would think you would be close to 80+

Too much prop?

 

Mercury has had a problem with some of the 28 four blade bravos cracking the blade so the dealer says. It ran 82 on the gps speedo on a cooler day at half a tank with me and the wife to be in it.(Cant remeber rpm) With the hydro 26 five blade will run 76 at 5,400 but on the rev limiter. The boat plane better and has much more lift. If the rpms ar close to that 5300 with the 28 I will be ordering a hydro 28 five blade. The boat has a 525 with the its box and a xr drive(sportsman) Any body heard what the new cavation plate is supposed to help due?


Terry

 

Running a Hydromotive

Our 29 Fever, HP500 EFI works best with a 24P Hydromotive. Hits the rev limiter occasionally in cool weather, light on fuel, 2 people. Runs right at 73 GPS. Summer, full of fuel (130 gallons) and 4 people, I consistantly hit 71 on GPS.

I bought a brand new 25P hydromotive last fall and it is too much for my boat for "everyday" use. I only had it on the boat for about 30 minutes. So, if anyone is interested, I have a brand new 25P LH Hydromotive Q-IV still in the box for $300. Let me know if you are interested.

Our previous boat, a 1996 27 Fever with carb HP500 would always run 73.6 on GPS, in the summer with a 26P Hydromotive Q-IV. In cooler fall weather, we could consistently hit 75+ on the GPS. All of this was on a lake, so no advantage from current (that can add about 2 mph, depending on the current's speed).

 

My new 29 with a 575 was tested at Fountain with a 30 RH Bravo 1. Sheet says 82.5 at 5200. I think with a load it is too much and am looking to try a 28. Once that is done and I get some numbers, I will get with throttle up propellers see what they suggest in the hydramotive line.

 

I AM RUNNING A 26 PITCH 4 BLADE. 1997 FOUNTAIN 525SC AND HITTING 77MPH 5100 RPM. JUST ME IN THE BOAT AND HALF TANK OF FUEL. HOPE THIS HELPS.

 

Latest gps numbers

29 with 3 people and 80 gallons of gas.

30 Bravo I 4800 rpm @wot doing 72.5 mph gps

28 Bravo I 5350@wot doing 75 mph gps.

Both with no tabs down and trim to 5.

 

Very sensitive to weight-but looking for best prop with a normal load of folks and fuel.

 

gilla - glad to see you're out having fun on the new boat!

 

LOts of FUN, for sure. Wed night is play night at Pickwick. All the hot boats come out and have some fun. The one with the sixes might be top dog at 117, unless David gets the twin 1350's out.

 

MEGA SLIP

I have a 2002 with a 500EFI. Best speed was 72 @ 5300. Midrange slip was huge (20% +) but the break even point was 30mph @ 2900. Prop was a 26 RH Bravo1 It takes a while for top end to be reached as speed increases but rpm does not.

I put on a Vortech blower and started out at a 30" RH B1. I can break the 30 loose at any speed but I haven't broken the motor in yet so I don't want to hold it wide open. Break even point actually got worse, now 3200 = 32 mph. 45= 3500 and 55=4000. 76 was at 5200 but was going up

I will try a 32 tomorow but it doesn't seem that pitch is the answer. Mid range speed is almost the same with both props.

Does anyone know what a 5 blade 30" Maximus will do to the mid range?

Thanks,

F

 

Re: Running a Hydromotive

Bob t,

I am interested in that prop... PM me.....

Our 29 Fever, HP500 EFI works best with a 24P Hydromotive. Hits the rev limiter occasionally in cool weather, light on fuel, 2 people. Runs right at 73 GPS. Summer, full of fuel (130 gallons) and 4 people, I consistantly hit 71 on GPS.

I bought a brand new 25P hydromotive last fall and it is too much for my boat for "everyday" use. I only had it on the boat for about 30 minutes. So, if anyone is interested, I have a brand new 25P LH Hydromotive Q-IV still in the box for $300. Let me know if you are interested.

Our previous boat, a 1996 27 Fever with carb HP500 would always run 73.6 on GPS, in the summer with a 26P Hydromotive Q-IV. In cooler fall weather, we could consistently hit 75+ on the GPS. All of this was on a lake, so no advantage from current (that can add about 2 mph, depending on the current's speed).

 

ISurvivedNMU,

You should have a PM.

Thanks,
Bob

 

:hiya: :vcol:

 

Reports that the Maximus from Merc is not yet up to expectations.

I also seem to have a prop slip condition. A 1 or 2 inch spacer to lower prop might be the answer.

 

Ran a 27 5 blade Hydramotive today with a fairly light load. 77 mph at 5250. Great out of the hole and great midrange puch compared to a 28 or 30 Bravo 4 blade. Seems to get the stern up sooner and the prop hooks up better in all ranges. Trying tomorrow with a heavier load but this is by far the best prop to date.

 

I called Keith at Mercury Racing and he said there was a 4 inch difference between a sttock Maximus and a Bravo 1.

I ordered a 28 Maximus but still haven't found a 32 Bravo to try.

Will post any results. I hit 81 with the 30 Bravo on the 5400 limiter.

Thanks,

F

 

Try a labbed 32 if you can borrow one. A 29 hydra 5 blade would also be a good option to try.

 

I tried the 28 Maximus and it was fantastic in the midrange. MPH was up about 10 mph at the same rpm from about 2500 to 4000 over the 30" Bravo 1. 3500 was 55 mph.

Top speed was nearly the same but there was more possible with the Maximus if I could let it wind up longer. Labbed should be perfect.

Only one problem though, the drive went poof. I am trying to determin if it was the 300 hours, the Vortech or the prop that made it blow.

Still hoping to find a 32 to try this weekend.

F

 

Fountain - I doubt if the prop had a lot to do with your drive going poof - w/ the hp and torque you are creating, you will need a stronger drive like an IMCO.

The mid-range slip seems to be typical for single 29's - I have the same problem.

 

Back to my Bravo 30. 78.6 mph at 5,000. Cruise at 3500 is 48 mph-which I like. A labbed 30 might be good for a few more rpm.

 

I was getting a little bit less at 3500 like 45 with the 30. Don't remember what 5000 was but 5400 was 81. The 55@3500 of the 28 Maximus was great while it lasted.

I ordered a 32 which should be here for the weekend I hope. I have been trying to find one for over a month.

Will let you know what happens.

F

 

Sorry I have not chimed in but I have been busy and need to make my mind up. If I want to go blown, get twins or just try to play with the props.


Terry

 

Went to the COPS run today to try out the 32. Waves were 4-6 feet on Lake Michigan with a few larger ones thrown in for good measure. The waves were coming over the bow.

All I can say is that it will still get on plane with 1000lbs of fuel.

Maybe tomorrow.................


F

 

32 I think will be too much.