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Thread: Back to a 21 pitch

  1. #1
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    Back to a 21 pitch

    I tried the 1.32 : 1 Alpha today. I'm glad I waited to do a base line before I pulled the trigger on a new prop. I lost a 1000 rpm around 4000 @ WOT with the 25p. I put the 21 back on and it went 5000 @WOT. Whish I had a 23P to test
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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  2. #2
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    I have 23 mirage prop mint.

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    Quote Originally Posted by joseph m. hahnl View Post
    I tried the 1.32 : 1 Alpha today. I'm glad I waited to do a base line before I pulled the trigger on a new prop. I lost a 1000 rpm around 4000 @ WOT with the 25p. I put the 21 back on and it went 5000 @WOT. Whish I had a 23P to test
    Is 5000 WOT not where you want to be?
    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

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    Quote Originally Posted by Ghost View Post
    Is 5000 WOT not where you want to be?
    I'd like to be around 4800. It seems that the 1.32 is 250 Rpm per inch of pitch. I think ideally a 22P would put me where I want.


    Craig thanks for the offer. But I'd like to bump up the blades. I get a lot of slip from the Mirages

    Has any one run a High five . They have ventilation holes and run even pitch numbers.
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



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  5. #5
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    Gotcha. What kind of prop is your 21 pitch? If it's a 3-blade, I bet a 21 pitch Bravo 1 would cut slip and RPM down. My 4-blade 22 pitch Bravo1 turns comparable RPM to 3-blade 23 pitch props I've tried. (Slightly less rpm than the 23s actually,)
    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

  6. #6
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    Quote Originally Posted by joseph m. hahnl View Post
    I'd like to be around 4800. It seems that the 1.32 is 250 Rpm per inch of pitch. I think ideally a 22P would put me where I want. I'd like to bump up the blades. I get a lot of slip from the Mirages. Has any one run a High five . They have ventilation holes and run even pitch numbers.
    Try a Mercury Rev 4 prop. You will be very happy.
    1972 16 OB - C16B-63 - "Surface Tension" Resto Project
    1974 16 OB - DMR16106017-B - "The Mule"

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