Craney

I see some guys put small angles on the outside edge of their K planes what is the reason for this?

F-2 Speedy

Dont think Ive seen them on the outer edge just the inner for more clearance for the prop

Craney

These were on the outside edge of the K planes.

scarabman

When I raced my single Pantera, (dont need the clearance of the angle as already mentioned) I flipped my 280 tabs around and ran the angle side out. It allowed the tab to contact the water sooner and/or at higher speed. Used to drive Jo nuts!

TeamSaris

Helps with turning. Mostly on stepped race boats. Its like an extra strake for grip. Results may vary.

Craney

Thank you, a buddy of mine just got the boat and it had 1.5”angle screwed to outside edge of the K planes, but it’s not a stepped hull.26 Martini.

blownhammer2000

my 32 sunsation has them, I know joe and Wayne only did it for a short time, not sure what the pros or cons are tho

Tartilla

This may be a good discussion thread for trim tab elevation from the hull. ( k-plane base height on transom)

I understand that you don't want k-planes to interfere with the hydrodynamic flow when not required. But wouldn't having them just flush with the transom, and angled up 4° (same as the rise of off transom water flow...being 0° trim tab) be optimal? When in use, there is a better angle of flow, beginning at the root of the tab, vs way down the length of tab, it they are raised?

The result being when in neutral (4° up position) the planes would act as lengthening the hull dynamics?

My 280s ara a full inch above the transom base, parallel. I think 380s would be far better for the application. Better water angles...and less of a water brake.

Angles facing in...would add to that issue?

scarabman

I thought we were talking about something different, being angles on the actual plate. Never mind what I said.

Craney

That’s very similar to what he has the picture that blownhammer posted.