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FREERIDE TOUR VTT 2009 - Compétition de vélo sans reconnaissance !

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Freeride Tour VTT 2009 : compétition de vélo freeride par équipe de 2 avec plus de 90 % de descente, ouverte aux professionnels et aux amateurs. Informations et inscriptions online

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Tennis bubbles are often advertised as a cost-effective alternative to permanent stick-built structures. The proposition is simple: why spend many millions of dollars erecting a brick-and-mortar tennis centre when you could spend a couple million to put a bubble over your existing courts? Instant all-season tennis dome. And that's no exaggeration of the cost savings. Whereas your typical community centre costs tens of millions of dollars to build, a tennis bubble only costs a few million, depending on the square footage. But what about those of us in cold climates? Is the cost of a tennis court in a bubble still feasible when you consider the increased cost of climate control, along with repairing damage from ice and snow? How Much Does It Cost to Heat an Air Dome? Truthfully, if you live in a chilly climate from Canada, heating your bubble in the winter is likely going to be one of your biggest operating costs. But you're not alone in that. Heating is the single biggest energy expense for most Canadians, whether they're playing in a fabric bubble or a brick building. Unfortunately, until we begin to harness localized sources of renewable energy, the cost of procuring gas or electricity to heat our dwellings is going to remain a significant expense. That holds true for the cost of a tennis court in a bubble, which has less insulation than usual. Still, the cost of heating a tennis bubble is not as much as you're probably thinking. Consider the following: A bubble is one big chamber. You won't have to worry about ductwork (a significant source of lost energy) distributing heat throughout your facility or, in the case of huge buildings, multiple furnaces. You'll only need to heat it a few months of the year, and in the case of a temporary seasonal bubble, you won't need to pay for air conditioning in the summer. Since you don't have to deal with air ducts, it'll be easy to upgrade your system as heating technology continues to improve and become more efficient. And even if none of that were true, the increased heating costs of keeping a bubble warm still won't come close to the additional millions of dollars you'd have to pay for a stick-built structure. In fact, the ductwork alone would probably cost more. What About Snow? Worried about having to patch up your bubble every year? Good news: tennis bubbles are fairly easy to maintain in the winter. If snow builds up on top, simply let a bit of air out so the pressure changes and the bubble deflates ever so slightly. This allows the snow and ice to slide right off. Think of how fast snow slides off the roof of your car once the inside warms up! And if damage does occur, know that it's possible to patch up a dome numerous times – and that they usually come with a warranty. A manufacturer will be there to help. Just make sure of that before you invest.