Prop choice for 575 with 1.70 transmission

[mjb929rr]

I wanted to follow up again on this thread. We tried the 16x17 prop again at our main summer lake which is 2900’ elevation. The prop worked out great here partially due to elevation but also lead placement. For whatever reason the new sl seems to be heavy in the back when fully loaded. We ended up putting 200 lbs lead up front and the rest around the tower area. We dialed in our wave with just 7.5 degrees of pitch and it was a very good progressive wake. Our engine rpms with 6 people, 1k in lead and all the ballast 95% or more was 3450. Rpms empty at 25mph was 3100 so not bad at all.

[HFarr]

What lake?

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[MJHSupra]

I wanted to follow up again on this thread. We tried the 16x17 prop again at our main summer lake which is 2900’ elevation. The prop worked out great here partially due to elevation but also lead placement. For whatever reason the new sl seems to be heavy in the back when fully loaded. We ended up putting 200 lbs lead up front and the rest around the tower area. We dialed in our wave with just 7.5 degrees of pitch and it was a very good progressive wake. Our engine rpms with 6 people, 1k in lead and all the ballast 95% or more was 3450. Rpms empty at 25mph was 3100 so not bad at all.

Do you usually run 7.5? I have good results at 9+.

I read there is more SL weight in the back to allow the front ballast to fill 100% and still have good pitch numbers.

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[mjb929rr]

Do you usually run 7.5? I have good results at 9+.

I read there is more SL weight in the back to allow the front ballast to fill 100% and still have good pitch numbers.

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Swanson lake in southwest Nebraska is our typical spot.

With our old sl450 it seemed like 8.5-9 of pitch was about right. With the new sl the wave seems the same at 7.5 as it does at 9. The difference is the rpms go way up at 9 degrees of pitch.