Join Date: Feb 2019
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In WW1, when planes were made of wood, they used Spruce because it had the best strength to weight ratio.
Southern Yellow Pines (Shortleaf, Longleaf, Slash, and Loblolly Pine) possess an excellent strength-to-weight ratio. You can find Southern Yellow Pines at many of the big box stores as 2x8, 2x10 and 2x12 marked "SYP". These can be ripped to any dimension needed.
Douglas Fir, available in some regions, is also a good choice.
Average Dried Weight: 27 lbs/ft3
Janka Hardness: 510 lbf
Modulus of Rupture: 10,150 lbf/in2
Elastic Modulus: 1,600,000 lbf/in2
Crushing Strength: 5,550 lbf/in2
Shortleaf Pine (Southern Yellow Pine)
Average Dried Weight: 35 lbs/ft3
Janka Hardness: 690 lbf
Modulus of Rupture: 13,100 lbf/in2
Elastic Modulus: 1,750,000 lbf/in2
Crushing Strength: 7,270 lbf/in2
Average Dried Weight: 32 lbs/ft3
Janka Hardness: 620 lbf
Modulus of Rupture: 12,500 lbf/in2
Elastic Modulus: 1,765,000 lbf/in2
Crushing Strength: 6,950 lbf/in2
I have been looking at the numbers you have posted and am trying to relate them to the wood we can purchase in a home depot / lowes in this area. (N CA)
Most of the doug fir that we can purchase locally is sold "green" and is super dense unless you can find kiln dried.
I have tried to use it in the past and it just warped like a snake. I have seen kiln dried 2x6 and 2x8 doug fir when visiting family in OH at a HD, but not out here, just 2x4s that you have to sort through to find anything useful.