All responses have been excellent. I will reply to each here:
Bruce, I am a machine designer, so wood construction is a bit out of my expertise, but similar calculations for strength.
showcrop, I like your idea of using the glue as a seal. I'll make sure to go around the perimeter.
paul, I do have some flashing laying around but no longer lengths. I might go with tar paper
TomH, I haven't really thought about how much I will overhang the axles, but you are correct, there is a more involved formula. Shear usually happens parallel to grain unless you were referring to joints.
Adirondack, You are correct. Reverse engineering something that already is proven in the field is better than any theoretical calculation. I just gotta start somewhere.
caterpillar guy, Your 4x8 white oak will be in the same ballpark for strength since the oak is a little stronger. Dimensions (mine are 4.5 x 7.25) are similar. I do have some used engine oil that I haven't recycled yet. Thanks for the tip.
Bill, You are correct about the moment of inertia. I am lazy and use the section modulus (I/y) since it already takes into account the distance to the neutral axis.
RandyB, I will use the tar paper idea and oil (used oil) but I think I'll be looking for a tarp.
Thank-you all!
I was originally going to just design for a small square bale evenly distributed load and then I remembered an old engineer who said, "If you are going to design a flat screwdriver, make sure you design it strong enough to be used as a prying tool." I am already getting comments about hay rides from my kids and parade floats from my neighbor. I don't even want to think about uneven and dynamic loading.
I got the chassis for 200 bucks and don't want to spend more than a few hundred on lumber. I already have the 2x8 kicking around. I just gotta get my hay to the yard.
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