I work as a volunteer carpenter on 2 tall ships, and I still have a 40 foot
sailboat that I built and launched in 1980.  My sailboat needed a piece of wood
to support a piece of hardware, about 5 feet long and about 2 X 1 inches, and it
is exposed to the weather.

At one of the tall ships, I asked if there was a piece of Osage Orange around
that I could take.  The man who was the head shipwright at the time poked around
and said “ I think this piece has been standing in the corner since the ship was
launched in 2001.”  It was 2" thick and 6” wide.  Well you can't get better for
outdoor exposure than a (at least) 17 year old piece of Osage Orange, yet when I
ripped it in half (not in the traditional way of the pit saw) one of the two
pieces warped down it’s length about 1/4” oit of straight, and it is so stiff
that my weight barely brings it back to straight.

Some woods are prone to this, and some pieces of any wood are prone to this.

On the other hand, I built a guitar last year of Ash, one giant piece that
looked like a split piece of firewood.  It was about a year since it was cut.  I
sliced it into 3/16” thick pieces, stickered them, and dried them for a month
with a fan on them, and for the neck, which was a 3 X 4", I flipped over a
cardboard box, set it over the neck piece on the concrete basement floor, put a
100 watt light bulb in with it, and waited.  I made 2 pairs of 2 marker marks on
opposite sides of the roughly square piece and set a couple of calipers to those
dimensions.  Every couple of days I tightened the calipers to be snug again, at
first 1/4 turn, then 1/8 of a turn, then 1/16 of a turn, then not at all.  When
it stopped shrinking, I doubled the time - total 10 weeks at about 105°.  12
months later, the neck is still straight and unchanged.

So there you go

Ed Minch
Grandkids are visiting and love the shop