Here is the first stave I picked out to debark. It sure looks straight to me. Has a slight twist at one end that should be easy enough to take out when the time comes.
Once I start debarking the stave I like to take it down to the 1st ring of heartwood past the sapwood or the last sapwood ring before the heartwood. In this case it looks like the last sapwood ring.
This shows the difference in the straight up sapwood and the one thats transitioning into the heartwood. Notice the color change. The full heartwood will be much darker as you will see when I show you the end shot of the stave when its fully debarked.
Here is the stave fully debarked and sealed on the back and ends with shellac. I like to use shellac because it seals better than just about anything and you can see through it to identify the rings on the end. Some guys use glue or paint and thats fine, but I like the shellac for this purpose.
And here is the end shot. I busted the belly split off of this one already. I got a 1 1/2" thick and about 1 1/2" wide belly split off of it. Notice the thick ring 2 down from the top. When it comes time to chase a ring and rough this one out, thats the one I will chase to.