These umbrellas are not always cheap to repair and, if you have to send them in, you will accrue extra costs in shipping. You can check with your local hardware or building supply store to see if they repair or know someone who does but, unfortunately, buying a new one is often the cheaper option.
If your looking for a cantilever umbrella you will have luck shopping at bed bath and beyond. They have cantilever umbrellas at reasonable prices. Use the online or retail store.
You can check for this site http://www.patio-umbrellas.com and search for their cantilever patio umbrellas. You can browse there their different kinds and different sizes of cantilever umbrella and choose what suits your need.
A cantilever umbrella can be purchased at most home improvement or department store in the lawn and garden section. Home Depot, Lowes, Walmart and Target all sell cantilever umbrellas. They can also be purchased online at Amazon.
Cantilever umbrella differ from regular umbrella in that the pole and the base is not found in the middle of the umbrella but on the side or outside the canopy. The canopy will then be hanging down which is contrary to the regular umbrella which is being supported by the pole and the base in the middle.
You can get that umbrella from amazon. Its highly likely to be available from there, since theu have mostly everything. The prices are cheap and good, plus affordable.
A cantilevered umbrella can be bent, or cantilevered, so that it is angling between the sun and the table. In this way you are in shade. They are usually more expensive.
Umbrella lights can be purchased at most hardware stores such as Canadian tires or Lowes hardware. They can also be purchased at an online store like Amazon.
Any home improvement store like Home depot or lowes I'm sure would carry cantilever umbrellas. If not, always try Wal-Mart, they seem to carry everything nowadays.
To find the reaction force of a cantilever, you can sum the moments about the fixed end of the cantilever (often where it's attached to a wall or support). The reaction force will balance the external load applied to the cantilever to maintain equilibrium. Equation of equilibrium can be used to solve for the reaction force.
You can kind commercial cantilever racks here at http://www.lkgoodwin.com. They are very knowledgeable and will help you find the rack right for you.
To find the magnitude of the force acting at the end of a cantilever with a distributed load, you need to calculate the total load or weight acting on the cantilever. This can be done by integrating the load distribution over the length of the cantilever. Once you have the total load, you can use equilibrium equations to find the magnitude of the force at the end of the cantilever.
I believe my research tells me that the best umbrella and stand to make it through a hurricane would be the cantilever patio umbrella. It can withstand high winds and falling debris such as tree branches or nuts.