of heel on a 6.9' BWL with a 2 ton displacement craft. Right now, my numbers show negative stability at 105 deg. The design is for a shallow draft, trailerable, 25' coastal cruiser. The design texts I have on have don't mention N and the KNsin(phi) is quite prevalent on the web, but without definition.

If my logic is flawed here, I would like a nay or even a yay if I'm doing it right.ДЄpplying mass to the righting arm will then give me the righting moment to be used in counter the heeling force of the sails.ДЄgain, N has been ellusive to me. According to my thinking and calculations, this is true. In this essence, GNsin(phi)=GZ in hydrostatic terms. You have to excuse me if my terms are not correct. I'm attempting to identify the range of positive stability for the boat I'm designing so I want to find the righting moment through all ranges of heel.(?) I then establish GN=KN-KG for use in GNsin(phi) to calculate the actual righting arm. N being the actual point where the heeled center of bouyancy passes through the vertical centerline of the vessel.(?) To find N, I rearranged the equation x=KNsin(phi) and for low angles of heel KN appears to be roughly equal to KM. (K=keel, phi=angle of heel) N was ellusive to me, but I believe it to be closely related to the metacenter(M). KNsin(phi) is a righting arm at the keel. With a little determination I'm thinking I've got a handle on the beast, but would like some confirmation that I'm on the right track. I've been looking for a description to KNsin(phi) and have not run across a definative answer.

I've been tossing around some cross curve data output from Freeship for a while and not really knowning what I was looking at.

What does kn stand for