I really like your design, especially the fact that you turn it by hand. Lowers the cost a lot! Thanks for sharing the drawing, very helpful. What other root vegetables have you used the washer for, and how are the results?
Beets, carrots, hakurei without tops, potatoes and sweet potatoes. Sweet potatoes were problematic due to the skins being damaged, all others did very well. if the carrots are small, they get caught in between the slots; adding a plastic mesh may be worth while (see RU-vid video "Root Barrel Washer - Saving time washing root vegetables"). Also, I added four large paddles to make it easier to turn, otherwise your fingers may get caught in-between the slats when spinning it.
Thanks for your reply. What is the spacing between the boards, 1/2 inc or 3/4 inc? Do you think you can make the spacing 1/4 inc so you don't have the problem with the carrots?
I think I targeted 1/4", but there was variation due to warped boards and my lack of precision (I ripped 1x12s to make the slats). We don't lose many carrots, and those we do are small anyway - a few more for ourselves and the cows.