Where is my spa cover? Ever have to ask yourself this question after a wind storm? I have had people tell me they have found their cover a quarter mile from their home. I do not know how they knew it was their cover. Maybe in some parts of the country people write things on their spa covers to help them recover them after a storm. I suppose you could write, If Found Please Call, on the bottom. Maybe, Hope This Spa Cover Did Not Land On Your Sister.
Spa manufacturers are building all sorts of shapes and sizes these days that can be purchased and delivered to your home and covered easily. But for high end custom built spas, that often cost six figures it is not so easy. Unfortunately far to often it is after the spa is complete and the owner gets their first heating bill that they think about a cover.
The question to ask is are they selling anything different? So far I have found stronger straps as their solution. Well you could build a solid roof that attaches to the spa but in case you did not notice solid roofs were flying right off houses. The answer is not stronger tie downs for the wing you use to cover your spa but get rid of the wing.
If you ask the designer of one of these spas how they intended it to be covered when the spa was not in use, the answer is they do not want it covered. That may not seem so bad if the spa is in southern California or some tropical island. However even these places need to keep rain water and blowing debris out of the spa. In snow country it becomes even more important to cover the spa when not in use.
It does not need to move it very much, just enough to create enough of a gap for some of the air to get under the cover. The second reason rigid foam spa covers fly is they have a nice air space between them and the water surface they are supposed to be keeping warm. Once air starts to flood into this air space it creates pressure. The air rushing in can not push down on the water so it takes the only thing it can move, the spa cover. Once this action starts it is only a matter of what velocity is required before lift off occurs. The first movement of the flying spa cover is straight up.
The pressure in the space between the water of the spa and the bottom of the cover pops the cover straight up. It takes a lot less force than you might think because it is lifting on the entire bottom area of the rigid foam cover at once. Even a saturated rigid foam spa cover that is too heavy for one person to lift will fly when the air is pushing on the entire bottom surface. Once a heavy spa cover gets airborne watch out because anything it runs into is going to get damaged.
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