prop results
 

Ok, 1999 Baja 252 Boss, 454 MAg motor. boat came with a 4blade bravo prop 22p, just bought 23p Mirage +...

Boat had full tank of gas, but tried both out to see the differnecewith same dya testing.

4 blade Bravo (22p)
3500 = 37 mph
4000 = 44-45 mph
wot 4700-5000 = 63 mph, 2 foot chop 1/4 tank of gas, just me driving (norrmally just at 60 on normal water and 1/2 tank)

3 blade Mirage+ (23P)
3500 = 40 mph
4000 = 47 mph
WOT 4800 = 59.8 full of gas, and 2 people, smooth as silk water (likes a chop better)


So i think i will see the 3 mph I wanted out of this prop once i burn some of the gas out, and play ins some chop... thoughs?

id stick with the 22 and had it labbed to gain a little rpm , as you loose fuel the 4 blade will also gain

4700-5000 is a large difference. Need accurate numbers to give the best advice.

Otherwise this shows how some Baja's love 3 blades. I will say it isn't common for the 3 blades to beat the 4 at low rpm's.

I will get better numbers int he next few weeks.

ok I can only trim the 23 mirage + to 4800 rpm's
but i can trim the 22 4blade to a littl over 5000 but it does nothing that high.

also i took out he black plugs to help it cavitate on the start and no matter howi tried it, it would not get on plane, just spun. I thought the prop was spun at first, tried a few things, and ten put the plus in and it ran normal again.

A Labbed 24 Bravo 1 with the appropriate trailing edge configuration should give you the best top end and better cruise than the 22 B1 or the 23 M+. We should be able to get you into the 4800 range.

I thought you said before that a Mirage + 23p was the best one for my set up, so i bought it. I guess i can try the other one out... but confused now, is it becasue of the results? or what

90% of Baja hulls run the best top end numbers with 3 blade props. That is a given. My early post suggested the 3 blade was the better prop on the low end which isn't often the case.

Once the numbers were confirmed, it showed us the B1 prop ran a better top speed and slightly worse in the middle. Again, reversed from the norm.

Because of that info, I beleive the 24 four blade will improve the mid over the 23 M+ and with the Lab process we can gain the rpm loss back and improve over the 22 B1 numbers on the top.

3/4 tank gas, noone but me on boat, and smoth as glass watter
63.1 @ 4600 rpms.

3100 rpm's = 37.6 gps.
35000 = 43 gps

less than a 1/4 tank of gas, driver and one passenger only.

4700-4800 = 62.4 Smooth water.

Think the chop can add the 3 mph back to it?

What prop are these numbers from?

Yes, chop helps most all boats to go faster. The design and size of the boat determines the best size of the chop.

My little 20' padded V loves 6" chop and my buddies 42 Fountain like 3' chop.

23p mirage plus..

ok 1/4 tank just me, 63.6....6 inch chop.. so nothing really.

23 mirage plus

You do need more "chop" to get the best number.

so brett, after all this thread, what do you think we should do, that way i can getit done before summer.

you should buy a 24 b1 from brett or ask him about the rev 23 4 blade if you buy from him you and test the props and he will lab it for you. I am going to try a 32 or 34 b1 this summer and have him lab it.

The 23 Labbed with a little extra rake should do the trick nicely. Your slip # is good and you have room to grow rpm wise. Additional adjustments will allow you to get the trim you need and are missing out on. Plus, you have the propeller. The only advantage to the 4 blade should be the low end and cruise speed. However, your boat seemed to like the 3 blade throughout other than the top end in the first testing. We now see equal top end numbers without the Labbing. Again the 3 blade works great on these hulls.

Call me if you wish to discuss it more in depth.

Brett

I love this thread!
I was desperately hoping someone would do a comparison on a 3 vs 4 blade of varying pitch unlabbed in a boat with a similar set up to mine!
I'll probably wind up comparing a 3 blade Mirage +, 4 Blade B1and a 5 Blade P5X or something eventually!
Anyone heard of anyone in Australia who labs props?
Surely there must be someone!
(Sorry for the thread Hijack Pontiac, back to you mate!)

We actually do Lab work for a few ski racing teams in Australia. We ship back and forth.

One of my customers did say there is a custom propeller shop in your country. However, he never mentioned a name nor did I ask.

Brillian Brett thanks!
I'll send you an email Cheers.

SO bringing back an old thread, here/

BUT after a year of playing with both props and never doing anything. I sure like how the 4 blade handels. rpms dont climb in corners, and it responds at say 35mph kick so much better. so What do you think about a 24p B1 prop, would it be to much for the boat? in stock form?? or would i need to do that and have it worked to make It work?

Hello again,

We can supply the 24 in stock form for testing if needed. I feel strongly that you will desire the Labbing. It really make a big difference on these applications.

Brett

I have tried several with my 454mag setup..

24p b1
21p m+
23p m+
21rev 4

I couldn't spin the 24b1 but 4500 with heavy load.. light was at 4750 at 63 with cool weather and light load.

the 21p M+ was good out the hole but tapped rev and cruise sucked at 46 at 4k (which is my cruise)..
the 23p m+ was a good performer and got my best wot at 64.7 in 50 degree with 2ft chop.

the 23m+ however didn't get out the whole with my normal load of beer, gear, and 3-4 bodies. also lost cruise speed with weight in boat. would get 48-49 with light load and depending on water 47-48 loaded

The rev 4 21 was a ROCKET out the whole... I could climp out at 2000-2500 rpms!! that was cool! but tapped rev and hit 61 max light load..

all #'s are full fuel btw.. always top it off.

I had a 23m+ that i was about to lab with bblades, but before they called me back I found a 22p b1 that was uppitched to 23 and cup added.

It runs well. get a good cruise with load at 48-49 at 4k but tops at 60-61 wot in chop with load. Other than the lower wot, I like this prop.. turning it 49-5k trimmed and loaded and climbs out the whole with no tabs.. Cutting edge did this prop before I got it.

overall... I like the 22p b1 conversion.. probably would have been better to go with 24 then lab, but I found this for a good price.. Dont' know if Bblades could do anything with it since I at high on R's already. would like to get a lil more out the cruise and 62ish wot..

We actually ran the tickfaw 200 and ran a good bit at wot and was running 60 with buddies ahead and I couldnt catch up.. but they have bajas too and I wasnt trying to run that hard and then realized it was too late to catch anyway!!

BUT... the b1 held speed with extra weight and gets out the whole with more weight with ease..

hope this helps mittens... I think our hulls are similar! later gator

SO i need to try a 24B, and see where the rpms stop at and then the labbing will alow it to spin back up the the correct rpm?

more direct question, does labbing raise the rpm or lower it? do you buy bigger and lab to a higher rpm, or buy smaller and lab to a lower rpm.?

labbing raises RPM so you buy the larger prop @ lab it to get the RPMs back

How does labbing affect out of the hole?

if you are running a bigger prop than you should?

Lagging can offset.... Will let you get more Rpms to get up out of motor.

Now for the more important question, as I struggled with the same thing.

What is your goal?

Top end or whole shot or cruise. This was my delima

Top end = lab bed 23p m+
Cruise= lab bed 24p b1
Hole shot= 21p rev4

The 24 p b1 would have been what I really wanted. Best cruise with better hole shot with 4blades. Could push nonlabbed 4500 with heavy load so labbing to get 300 more Rpms would have been perfect.

But, I had to buy prop then lab...... So I ended up finding a 22p b1 that was repitched to 23 and cup added. Was not lab bed but cruise with good load and full fuel was at 48-49 at 4k and wot at 4900 or so at 60. Top end could be a little better, but I could get out hole w/ out any tabs... So I'm happy with that for now and only 1 good run to test. Need to clean k/n before next run b/c I forgot and it was pretty dirty, so might be able to squeeze another 2 out of her.

Did run 62 with light load and flat water on prev run..

Will see!! good luck

I would love to cruse a little faster, and i like the 4 blade when turning (does not rev up at all). the hole shot is niceer too with no tabs, and more responsive feeling at say a 35mph kick.

but i want to be able to hit 60 all the time too haha.