400 with 1.76 transmission prop choices

[larry_arizona]

Supra no longer offers the 16x15.

Choices are
Standard 16x17
Optional 16x13.9, 16x12.5

My dealer recommends the 16x13.9, 80% take rate.


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[Stazi]

I thought lower Pitch was supposed to produce lower RPM, and lower Top Speed.

No. It will produce a lower speed at the same rpm as before, but more torque/thrust. So if you have a top engine speed of 5000rpm, your top speed will be lower at that rpm the it was was with a higher pitched prop.


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[dakota4ce]

Supra no longer offers the 16x15.

Choices are
Standard 16x17
Optional 16x13.9, 16x12.5

My dealer recommends the 16x13.9, 80% take rate.


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The 16x13.9 sounds weird AF—must have a lot of cup to make up for the pitch. Any idea what cup is?


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[DNIXD99]

No. It will produce a lower speed at the same rpm as before, but more torque/thrust. So if you have a top engine speed of 5000rpm, your top speed will be lower at that rpm the it was was with a higher pitched prop.


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Well that makes sense then. I guess my 2943 (10.5 pitch) was operating properly. I had more torque, but higher RPMs at the same surf speed. I see a lot of people doing the exact same thing, and expecting lower RPMs at the same surf speed. I went back to my 2419 (12 pitch). It has just enough power for my setup, and runs about 300-500 less RPMs. Ideally, I think Id want an 11.5, but Acme doesnt sell it. Thanks for the clarification. It makes sense.

[larry_arizona]

The 16x13.9 sounds weird AF—must have a lot of cup to make up for the pitch. Any idea what cup is?


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Cup is .105”

Here is the link:
https://acmemarine.com/products/acme...-13-90-4-blade


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[dakota4ce]

Cup is .105”

Here is the link:
https://acmemarine.com/products/acme...-13-90-4-blade


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Seem to remember that .025 cup sort of acts like 1” of pitch, or at least can. This makes sense if my recall is on.


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[larry_arizona]

Seem to remember that .025 cup sort of acts like 1” of pitch, or at least can. This makes sense if my recall is on.


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Seems like someone designed a very specific prop..... perhaps SC custom designed this prop for the 1.76 trans? The 13.9 is a very specific pitch.

It appears to have replaced the 16x15 prop option.


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[dakota4ce]

Seems like someone designed a very specific prop..... perhaps SC custom designed this prop for the 1.76 trans? The 13.9 is a very specific pitch.

It appears to have replaced the 16x15 prop option.


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I did just chat with Jim at Acme two days ago and he did not mention it. Oddly enough. And I called specifically to discuss 16 X 15.


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[larry_arizona]

I did just chat with Jim at Acme two days ago and he did not mention it. Oddly enough. And I called specifically to discuss 16 X 15.


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To clarify, SC no longer offers the 16x15 option, at least not on the Supras.


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[dakota4ce]

To clarify, SC no longer offers the 16x15 option, at least not on the Supras.


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Moombas are all OJ props from the factory. Always strikes me as peculiar. The factory 15.5x16.5 may be just fine, too.


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