New to the Forum 01' rage
 

Hey everyone just wanted to say hi.

I've got an 01' rage open bow runs 86mph. Working on proping the boat correctly. I think there is a couple more mph in it. Any Ideas on that would be helpfull.

http://i972.photobucket.com/albums/a...0000870454.jpg

Welcome!

What rpm @ 86? What altitude? What kinda loads? What prop do you have now? If you still have 300ish rpm to give, just send it to Merc for a lab.
Look back into previous threads. There is extensive data from all of our experiences. Based on what I see, B1 30 labbed by Merc for your boat @ sea level. That's the prop I'm needing @ my 4500'. I have a 28 Merc lab B1 that I'd like to unload if interested. If you boat at any altitude or load lots of beer, that would work good for you.

It ran 86mph @5100rpm at 1200 ft elavation in good conditions and a fairly light load with a 28p bravo 1 (water conditions were very good, very flat). It ran 81 at lake saguaro (1500' elevation) @ 4900 rpm with a 30p in rough conditions, and a fairly light load. The dyno says the engine make over 700ft/lbs of torque between 3800 rpm and 5100 rpm and continues to make over 600ft/lbs to 5400 rpm. Makes max hp 680 @ 5100 rpm. I would like to spin more rpm. I was thinking about cutting some of my 28p. or maybe going with a labbed 26p. We go to the river alot, lower elavation, but have not had great conditions to run the boat. Memorial weekend it was mighty rough and the boat ran low to mid 80's.

I would just send your 28 to Merc for labbing. I & others have had good luck with the job they do. There are others, but it's hit & miss. They told me exactly what I should gain, & I gained exactly what they said. Their standard lab would add approx 2-300 rpm & 2-4 mph. That should put you right on your rev I'm guessing (5400?). 26 will probably be too small, labbed 28 ends up being about 26 anyway, labbed 26 would be around 24.

Cool! Thanks for your help. Is your labbed 28 you want to sell right hand or left hand rotation? I am running a lhr prop right now.

Hi Andy and welcome to the Nordic group :ernaehrung004:
Curious about your first string of data which states 86@5100 with a 28 pitch.
That correlates to a slip of 3% (actually 1%) which obviously is not possible.
The 81 @ 4900 with a 30 is pretty much spot on with Rage results at 13% slip.
Is there a typo in the first line? Just curious so we can better help you...
Dave

Thanks for the info. That was the reading I was getting from my gauges. Could be incorrect/speed? I am going to run it again this weekend at Havasu with the 28. I'll have gps speedometer this weekend.

The Gaffrig is 5+mph off, at least mine & every other I've seen. I am typically 17% slip @ the optimal trim.
The 28 I have is the correct rotation.

Thanks for the input!

Will the slip% go up or down based on prop pitch?

Do you think labbing the 28 back would get me on plane faster?

The 30 when I ran it seemed to hook up better than the 28, although conditions were worse.

Andychb,
I am headed to Havasu for for the regatta on thursday I could let you try out a couple of my props. I have a Bravo 1 26 not labbed, at 26 pitch Cutting Edged Bravo type, and a labbed Bravo 28 pitch but the lab job is questionable. I think they cut most of the cup off and vented it when it was labbed. I picked it up cheap, so I JBwelded the vents closed so I could get on plane.

Don't pay attention to slip too much, just speed & handling. Generally, the bigger the prop, the harder to plane. My 32p won't stay on plane till 25-30 mph, 28p planes @ 20-25 mph- tabs up, but the 32 is about +10 mph cruise @ 3500-4000 over the 28. I like being able to pass boats just cruising then stab some boost as I blow by! :angry-smiley-038:
Labbed props don't make much hole shot difference that I'm aware of.

Yea I've got a labbed 30 to test too. I am going to run the 30 and the 28 this weekend back to back and then take that data to my prop guy. He is telling me my speedo is about +two mph off.

I would get an accurate GPS speedo asap!

When doing prop testing, I usually use both my lavorsi in-dash GPS speedo, my Garmin chart plotter GPS speedo, and a handheld GPS speedo... just to make sure I am getting accurate data.

I also use both the analog tach, and and the digital Smartcraft tach... to make sure my rpm's are accurate.

Accurate data produces accurate numbers that can usually be improved upon.

If you have inconsistant numbers... it is hard to tell what is real... and what is fiction.

Fiction is hard to improve upon.

Chris

If that 30 doesn't work & you need a 28, I'd love to work a trade deal.