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Discussing Poplar....again

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wb2754

Member
Joined
Jun 5, 2016
Messages
22
Location
NW Fl
Hello everyone,

I have a question for everyone, but especially the engineers and designers.

Of course IAW AC 43.13, Spruce is the standard for our use. Concerning Poplar in particular, it cautions that it is not a direct substitute without considering the reduced strength.

With that in mind, according to table 1 of Forest Products Laboratory report 354, Yellow Poplar has properties very close to, and in some instances greater than Sitka Spruce.

Not being an engineer, it seems that "modulus of rupture" is the critical property for our use, and Poplar looks to have about 97% of the strength of Spruce. How far off base am I?

For us non-engineer types, how much adjustment in dimensions must be made to compensate for the differences, or is Poplar just not viable (hopefully it is)?

Thanks
William
 
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