Shoutout to the old timer who told me to slow down on the cutterhead speed

Had a 30 year vet stop by my site on the Mississippi near Memphis last week. He said I was running the cutterhead too fast and just churning mud instead of cutting. Got me thinking, is there a right balance between speed and material removal, or is it more about the type of soil you're in? What's your take on setting cutterhead RPM for sand vs clay?

2 comments

2 Comments

white.alex1mo ago

...and honestly that's something I picked up from a dredging forum years ago, where a guy broke down cutterhead speed by soil type. For sand you can crank it up a bit since it breaks apart easy, but for clay you really gotta slow it down to bite in instead of just polishing the face. I remember reading that too fast in clay actually makes the material pack up and block the suction, which defeats the whole purpose. So that old timer was probably dead on, especially if you're in that mixed Mississippi mud that's part clay part silt.

olivers281mo ago

Respectfully, I’ve seen it the other way in practice. Running a cutterhead too slow in clay can actually let it gum up worse because the teeth don’t have enough energy to shear and break the material free, it just smears. A faster speed helps keep the face clean and the slurry flowing if your pump is matched right. I’ve had better luck bumping up the RPM a bit in heavier clay and backing off on the swing speed instead.