Attempting to Understand Prop Walk - It's wierd
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- Опубліковано 23 сер 2024
- #AD Prop walk explained!* or rather what you should know about prop walk as a boater and how it can actually help you!
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*I'm not 100% that my explanation of prop walk is accurate, but the maneuvering advice is solid. #savvynavvy @savvynavvy
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Always find these videos interesting in a great way.
Nice explanation!
Great video chat. Still figuring out my prop wash twist in my small (but heavy) Pacific Seacraft- Flicka 20.
btw… nice video/audio voice. ❤ your face reaction at 4:17 (single screw!) 😂..! And all other facial cues…. More videos please.
Prop walk is related to the hull, but not because of a push from the prop on the hull, but rather because the hull kills the tip vortices on part of the prop and because of that it cancels the thrust on that side. It's not so much the water coming off the prop is pushing on the hull, but rather that the prop blades are being very efficient in part of the rotation and very inefficient in the rest, so you get more thrust down one side. At these low speeds, prop slip is also causing a paddle wheel effect on the bottom half of the rotation of the blade, exactly where there's really inefficient thrust, so the bottom of the prop is just pushing water to the side and not providing any reverse thrust.
A really accessible way to see all this is in the kitchen. Make a glass of chocolate milk with one of those battery powered mini whisks or make some whipped cream with an electric mixer with only one paddle. As you bring the spinning mixer towards the side of the container you'll see the level of the liquid is lower on the side closest to the wall of the container and a lot higher on the other side. The side of the container is just like your hull and the spinning mixer paddle is just like your prop. As the vortex gets cancelled out by hitting the wall of the container, it continues down the wall, unable to spin back to the front side of the paddle. The battery powered mini whisks are good for demonstrating that this effect isn't just in a semi submerged wheel but also happens when it's fully submerged.
This is an excellent explanation. I should have left in the part where I talk about sail drives having less prop walk because the hull is farther away and doesn't interrupt the fling as much... I get sick of editing and listening to myself, though. Thank you again for this! The internet is the best!!!!
Luv the tone of your voice!
River current, rocks, bridge pier, trailer, outboard jet…
Now add a folding or feathering propeller to the mix, for extra fun!!
Maybe if you showed this with an example from being on a boat, it would be worth a thousand words
Great explanation. I always found it easy to visualize prop walk by just imagining the prop as a wheel rotating along an imaginary road underneath it that wants to drive the stern of the boat in whichever direction the top of the wheel is going. I agree with you in that it doesn't feel right to say that the bottom of the propeller somehow has more traction in the water than the top for many of the conventional reasons that are given....it just doesn't seem like there is enough differential pressure there to justify the extremely noticeable reaction that even a slow moving propeller can cause a boat to feel. But it does work so I choose to ignore how it makes me feel when I jump down the fluid dynamics rabbit hole only to find myself more confused than when I started 😂
I liked and subscribed. Thanks for your videos.
Now I am going to go record my hit single, "Boat Love."
@dangchanneldeg6948 ... crap, now "love boat" is stuck in my head. Quick! Make the song!!!
I'm gonna make you demonstrate what that looks like with your hands someday in public!😂
I've got a new dance!!!
Propwalk is why dingies go in death spirals when the helmsman goes overboard. (when not wearing the kill cord, you actually must be of some kind stupid not wearing your cord)
Do Arenson surface drives have prop walk? There would be no rebound thrust off a hull because of their being at the end of a stick. Also those long drive Thai canal boats have nothing around the blades.
In my experience, I get very little prop walk from saildrives which are set far from the hull of the boat, so I would bet that those crazy canal boats don't experience walk.