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Question about Prop pitch and size.

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Old 07-19-2007, 06:21 PM
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How much should I trim her up. I stop trim just before i get a little roster tail.
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Old 07-19-2007, 10:10 PM
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Hey Iggy, he is not even close to what that small block should be running RPM wise, you really think he can pull a 21?
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Old 07-20-2007, 09:18 PM
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From what I have read, Mirage props are mostly made for big block boats. This one is 15 1/2" big. Most 19 or 21p props are around 14". So maybe I just need to go with a smaller diameter prop like a 19p 14" Laser. Does this sound right?
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Old 07-21-2007, 12:05 AM
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Quote:
Originally Posted by seansmp8 View Post
From what I have read, Mirage props are mostly made for big block boats. This one is 15 1/2" big. Most 19 or 21p props are around 14". So maybe I just need to go with a smaller diameter prop like a 19p 14" Laser. Does this sound right?
CALL BBLADES they have a prop swap you give them your info they send you a prop for testing its a little extra say 25 bucks I would start with a laser 21 and if you pick up speed but are a little low on rpms you can have it labbed to get them back if the 21 is right at 4800 I would go to a 23 and lab it that should get you back to 4800 and you might pick up 5mph. a friend of mine is putting in a 350 325hp he had a 220hp merc before its a 17ft runabout we are hoping to turn a 24 3 blade turbo prop I have which will have it running in the 60plus range . if not he will buy a 21. art
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Old 07-21-2007, 02:58 PM
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who is BBlades???? you have there contact info?
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Old 07-21-2007, 11:17 PM
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Bret at BBlades will take care of you.
BBLADES Professional Propellers, LLC
N5007 Highway 73
Princeton WI, 54968
Phone: 920-295-4435
Fax: 920-295-4436
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Old 07-23-2007, 06:15 AM
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Hey Iggy, he is not even close to what that small block should be running RPM wise, you really think he can pull a 21?
I never said he could run a 21" pitch. I used that size as an example.
A 21" isn't all that big. My 1988 F-206 LS Formula has the original 260hp 350 MAG and it came from the factory with a 21" Mirage (which I still have) on a Alpha drive. Top end is 58 mph @ 4800.


Quote:
How much should I trim her up. I stop trim just before i get a little roster tail.
I trim till the engine increases rpm without an increase in speed. At this point the prop is slipping. Then I lower the drive till it stops slipping. Some day I'll get the trim indicator fixed and I'll know exactly where it's at.

Last edited by Iggy; 07-23-2007 at 12:29 PM.
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Old 07-23-2007, 11:09 PM
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My trim indicator is broke too. Its just kinda frustrating because I see all these people with stock 5.7 260hp hitting 55-60 and here I am with a Vortec 350, comp cam and a 750 carb and I can't get anything decent. My boat is only 20.6' so its not like I am pushing a 24' with a 350.
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Old 07-24-2007, 07:34 PM
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does anyone Know of any "lend a prop" dealers on the easter shore near Kent Island?
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Old 07-29-2007, 06:28 PM
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Ok, I tried a 19pitch cleaver prop. yesterday and got the rpms at 5200 but still only got 53mph. Do you think I should go to a 21 or 23? I was thinking a 21p laser would get the rpm down and maybe a few more mPH.
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