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ratdude747 replied to the thread How to remove pressed prop hubs before recycling.

I had always been under the impressing that there was more to it than just a shop press, as ubiquitous as such presses are. Or is that a...

Jun 22, 2026
ratdude747 posted the thread How to remove pressed prop hubs before recycling in Prop Questions and Topics.

Here's an atypical prop question: I have four aluminum props sitting around with rubber hubs. One has a spun hub (pressed Mercruiser)...

Jun 19, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Which (as shown in this thread), tracked for me as well. One of these days I'll give the 19P 4-bladed solas a try... free is free.

Jun 19, 2026
ratdude747 replied to the thread GPS Speedo.

I have. I have an 18 pitch 4 bladed prop that hits middle of WOT range under load, while I have a 19 pitch 3 bladed prop that hits top...

Jun 19, 2026
ratdude747 replied to the thread GPS Speedo.

Technically, it can be if comparing props of different types (material, blade count, rake, diameter, etc.), although the "is is a...

Jun 18, 2026
ratdude747 replied to the thread GPS Speedo.

But the relation to ground (GPS) speed may be close enough depending on the activity? Example being pulling a tube/skier on a lake or...

Jun 16, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Here's a video of one of the full throttle tests. In this one I topped out at 46mph. An earlier run (not videoed) hit 47 briefly, but...

Jun 14, 2026
ratdude747 replied to the thread GPS Speedo.

I GPS'd my gauges when I redid them as part of a larger overhaul (pitot tube setup was destroyed and useless). But while I mostly used...
Jun 13, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

(Delete this, I have fat fingers)

Jun 13, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Results: On the 21 pitch prop, I was able to hit a WOT of 3950-4000RPM, right near the middle of the range. Top speed was 45-47mph in...

Jun 13, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Going to give the 21 one more try tomorrow on the river (or so is the plan). Just my wife and I, running as light as we'd ever run. Less...

Jun 12, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Good point on the cam grind. Did you mean 1980? My boat is a 1976. And one of the two 888 outdrives I've salvaged came from an early...

Jun 11, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Oh I know. I just like Piranha and the blades being a serviceable part that doubles as a mechanical fuse in the event of a strike. One...

Jun 9, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Piranha doesn't make a 20 (at least in 3-bladed 14.5" "A" blades). I thought they did, but it seems they don't.

Jun 9, 2026
ratdude747 replied to the thread Mercruiser 888 Unexpected Prop behavior?.

Yes. 4200 on the 19 with 4 people is likely too high if running lighter... so that'd make the 21 with two people at 3700 the lesser evil...

Jun 9, 2026

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