I have a 86 Baja 320 Force, 400's with TRS, I run standard Mirage 23P now, I have seen a best of 65mph at 5000 on GPS, it definently needs more bow lift and I know Mirage Plus's are better for that, but is there a 4 blad that I could try to get more cruise and similar top end? I know top end will be most likely best with a 3 blade, but I also heard that some 4 blades may equal same top end while lifting bow and get more cruise, I average 44 mph at 3500 right now, I would love a better cruise since I spend alot of time there.
I do not have alot of other 320's to compare with as most have went to bravo, or have 32 Calibers with same hull but again, Bravo boats..
I tried drives spinning in and had pretty much same results but horrible driveability in rough water, I am on Lake Erie and like runnign in the rough stuff so I like drives spinning out, at least for now!
If the boat is a 65 mph boat I am fine with that just want to make sure I have best all around performance..
Thread: Deep TRS's 4 blades and good?
Results 1 to 20 of 21
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08-11-2009 07:12 PM35 Cigarette Mistress
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08-13-2009 09:32 AM
I think a 4B propeller may indeed carry the load better but top end may be effected, negatively. There is only one way to find out.....try a set. Are you props Mirage or Mirage Plus props?
JulieWhen you feel the need for speed...Throttle Up!
GO FAST or GO HOME!
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08-13-2009 11:19 AM
I have a set of 4 blade bravo1 4 blade 22 that are a close match to the 23 3 blade but I get a better cruise speed with the 4 and more top end with the 3.
Boat is a 1984 Formula 402. 502 efi mags max rpm @4400 (I know a little over proped)
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08-13-2009 11:45 AM
Correct Scottc....If his 23P props are Mirage Plus props then your 22P Bravo I props would be great!
If he has old style Mirage then things will be different.
JulieWhen you feel the need for speed...Throttle Up!
GO FAST or GO HOME!
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08-13-2009 11:49 AM
What changes would I need to get my r's up to 5200 but still maintain close to what I have speed wise? I top out @51-52 mph @4300.
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08-13-2009 12:23 PM
So that would mean that you will need 15.0 x 20P 4B Props.
What motors do you have?
JulieWhen you feel the need for speed...Throttle Up!
GO FAST or GO HOME!
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08-13-2009 04:22 PM
I had 400's but added Merlin heads and Holley intakes, they should be about 440 hp now...??? my speeds and rpm seem to be off even with the Mirage the more I see what most guys run with 420's with similar hulls, I am thinking it has alot to do with the lack of bow lift I have, I can trim the boat to the moon and it rides very level..
35 Cigarette Mistress
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08-13-2009 06:51 PM
If Labbed props are what you want, we should go with the B1's. However, stock Revolution 4 props create great overall lift out of the box.
Your efficiantcy is good at cruise and top end with the existing props. That's actually a little surprising.
We can test M+ props and B1's if you like. Personally, I think a modified 24 Bravo 1 prop would be my choice. As long as 4900-500 is a good WOT RPM.
BrettBrett Anderson / Owner BBLADES Professional Propellers
920-295-4435 www.bblades.com
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08-13-2009 10:04 PM
Thanks,
I just picked up a set of Hydromotive 23P 4 blades from the previous owner of my boat, I want to see how they are now, he never used the boat for WOT really, just cruising, he kept these when I bought it, I added a few hp since then and want to see how it runs since they wer elocal and easy to try, he had no speedometer on it so I have no idea how it ran for him then.
I will see how it goes and get a 4 blade baseline with these for right now then move on..
again thanks..I will be contacting soon!35 Cigarette Mistress
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08-14-2009 08:05 AM
I would be interested in trying those too since I am staying away from WOT now. I dont think they have enough bow lift though.
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08-14-2009 03:35 PM
The Mirage, Mirage Plus, Bravo I and Maximus props are high rake, which means bow lifting props.
The Hydromotive QIV, P5 and H6 props are semi-cleavers with lower rake so they are considered stern lifting props. This is also the case with Hering and Throttle Up props.
JulieWhen you feel the need for speed...Throttle Up!
GO FAST or GO HOME!
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08-16-2009 09:04 AM
OK, tried the Hydromotive 4 blades yesterday, 23 pitch, I was very surprised at results...
3500= 49 mph cruise
4600-4700 =62 mph
The lake was flat, I bet it would hit 64-65 with 3-4 footers as this boat runs best there, I do still have bottom paint on the boat that I hope to remove this winter since I finally found rack storage, I was always told it slows you done 1-2 mph, then yesterday had a friend tell me when he had to put it on his Formula he lost an honest 5 mph, boat drove great with the 4 blades, I really like them, I now wonder to get rpm up should I have these worked or go with a tad smaller pitch?
Again, I was amazed at results, I did not think it would break 57-58 with a 4 blade, I was wrong..35 Cigarette Mistress
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08-17-2009 11:58 AM
It is carrying the boat better obviously! Testing is always a good thing and can produce surprising results. Now bottom paint can certainly rob you of top end and I have heard anywhere from 4-8 MPH. I would recommend that you remove the bottom pain, baseline the props and then adjust from there.
JulieWhen you feel the need for speed...Throttle Up!
GO FAST or GO HOME!
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