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Message: [QUOTE="DirtMechanic, post: 221900, member: 5568"] To extended one idea [USER=15114]@Marck[/USER] gave on the angles, it is limbs extending out at 90⁰ from a trunk that are often the strongest though wood types have a say. A vee or parallel branch can peel easier in the wind because the roundness of the union is not there to dissipate stress. It has long been observed that stress spreads itself through materials in ovoid fields of energy. The resulting cracks are not of course, as a material shears apart. [ATTACH type="full" alt="feart-08-00033-g006.jpg"]87087[/ATTACH] Many trees, like oak, know this but bradford pears do not. [/QUOTE]