Can I diminish prop walk more?

[Chenige]

Is the prop sharp enough to cut your finger easily? Dull props can cause severe prop walk.

Very sharp

[Chenige]

Prop walk causing issue found?

OK, I think I have figured out what is wrong. Been having moment diagrams going thru my mind (for Engineers).
P1040414.jpg
My rudder is forward of the prop shaft centerline. The lateral prop force is rotating around the rudder and causing the boat to go right. Imagine if the rudder was held in place. The prop walk force would cause the boat to go in a clockwise direction (turns to right).

Now imagine the rudder is behind the prop. The prop walk force would cause the boat to go in a counter clockwise direction (turns to left).
P1040423.jpg
Does this make sense?

[MarkF]

First off your suppose to bend your strut to the left to keep it from pulling the boat to the right. Second you use trim tabs if you want to get rid of the prop walk or and put extra weight on the left side of the boat and this will help as well.

Mark

[Chenige]

First off your suppose to bend your strut to the left to keep it from pulling the boat to the right.

Photo just above is bottom view. Strut is bent to left.

[siberianhusky]

I think I'd try moving the rudder back about another inch, get it a little deeper into undisturbed water and mount a turn fin on the back starboard corner @ 90 degrees to the bottom of the boat.
Trim tabs won't do anything for propwalk, I always try to get my boats set up without them, they are a last resort handling cure for me.
That has a pretty shallow vee, I know next to nothing about them but you could look at Crackerbox and Jersey Skiff threads, If I remember right the plans I looked at for a Crackerbox had a skeg mounted on the centerline somewhere near the CG, I think this is the give the shallow hull a forward pivot point like a rigger or hydro. I've never seen one in person so thats pure speculation there. It looked like an upside down shark fin hangin' off the bottom!
I don't think the hull as set up has enough bite to keep it from sliding sideways across the water once it starts skipping and planing. The prop is able to overcome the only lateral resistance the rudder is able to provide, and being behind the rudder it has a bit more of a mechanical advantage.

[Chenige]

Thanks for all the input. Here is what I am planning on doing.

buy 75 mm rudder with water pickup
....install slightly closer to prop laterally
....install at least as far back as the prop
....install as deep as I can

Revise stinger back to where I started with 1/4" offset starboard of keel and just a degree or so of angle.

Make up new motor mount.
....lower motor slightly (1/8" or so)
....leaves room on port side for battery to be on bottom of boat.

Siberian, boat already has turn fins on both sides perpendicular to bottom of boat.

[MarkF]

My comments were made because you sad you bent the stringer to the right. The rudder needs to be at least 1" below the prop. Moving it around will only change how it turns and have nothing to do with prop walk. Adding trim tabs and moving weight to the left side of the boat will have everything to do with fixing prop walk however.

Mark

[siberianhusky]

lol couldn't see then in the straight on shots I looked at.

[Chenige]

My comments were made because you sad you bent the stringer to the right.

Mark

fixed