Douglas Fir, Modulus of rupture 12.4ksi SpGr: .48
Sitka Spruce: Modulus of ruptu 10.2ksi SpGr: .36

Thus, Douglas Fir is about 22% stronger than Sitka Spruce, with about
4/3rds the density.

From The Wood Handbook, CH 4, Mechanical Properties
http://www.fpl.fs.fed.us/documnts/FP.../fplgtr113.htm

Lou Parker wrote:

Can anyone tell me the truth? When I read articles about the
difference between the two woods, the information says that fir is 23%
stronger than spruce. When I talk to people they say only 10%. Anyone
got a handle on this?
Lou

--
John Kimmel















In the desert
I saw a creature, naked, bestial,
Who, squatting upon the ground,
Held his heart in his hands,
And ate of it.
I said, "Is it good, friend?"
"It is bitter -- bitter", he answered,
"But I like it
Because it is bitter,
And because it is my heart."