Prop Motor
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Hurricane Shutter Types
Protecting your home is very important if you live in a place where hurricanes occur as your home is your single largest purchase. One method to accomplish this is with hurricane shutters. Keeping out the wind and rain due to broken windows is the primary purpose of hurricane shutters, but they will also make your home look beautiful too. Miami is a location where every house should have window protection of some variety. Here are some of the most common Miami hurricane shutters.
Varieties of Hurricane Shutters
Accordian Hurricane Shutters
Accordian shutters are permanently attached and normally stored beside the window when not in use. This type of shutter unfolds like an accordian and pulls across the window. A single person can quite easily set them up and they usually have a locking mechanism to prevent theft. Unfortunately, they generally don't fit in with the style of the home and can be ugly.
Colonial Hurricane Shutters
These shutters attach to the wall beside the window and then come together over the window when deployed. They are permanently attached and unlike the accoridan style, can enhance the look of the home. One downside is that they can't be used to protect doors so you will need to use at least one other type of protection. This type of shutter is propped open above the window when not in use. They can be attractive and the shade they provide can also be beneficial. When they are needed, one person can most often drop them down into place easily. These can be weaker than other types of shutters, so you should check on the strength of the particular shutters you choose. Also, like colonial style, they can't be used to protect doors.
Roll-Down Shutters
This type of hurricane shutter attaches above the window. The shutter rolls up like a window shade when not needed. Either an electric motor or a hand crank can be used to lower them. While you'll need a battery backup in case the power goes out, electric shutters are prety easy for a single person to roll up and down. If cost is an issue, you might want to look at other types, however, because roll-down shutters can be more expensive.
Storm Panels
These shutters are typically made of metal and attach with brackets to the walls, covering the windows. These shutters don't detract from the beauty of the house because they are removed completely when not in use. Due to this, though, it can be hard for a single person to deploy in the event of a hurricane. Unlike some other types, these shutters can protect both doors and windowss and are quite strong. You should periodically inspect the panels to make sure that all of them are ready and in good shape and you'll need somewhere to store the panels when not in use.
You want to make sure that your home is properly protected no matter which type you select so be sure to hire a professional and reputable installer. You can discuss the various kinds of shutters with your installer and he/she can help you select the best shutters for your pick the best shutters for your home after discussing the benefits and drawbacks of each type.
LiPo batteries and charging?
I am trying to fit a 34" static balsa airplane with electronics for radio controlled flight. I am trying to use a lighter power system so I am using 2 cell phone batteries. They are wired in series, each rated at 800 mAh and 3.6V. My M-meter showed a total voltage of 3.2 volts after they were joined, (they had not been charged yet) I ran the 400 series prop motor and found great power and a draw of 2.34 amps. Now to the problem...I tried to perform a charge using a 12 volt 500 mA transformer. I planed on a quick charge rate of 8 minutes to see how it worked. The battery made it to 4.12 volts but the charging transformer died. I tried another transformer of the same type and now it is giving me an output of 4 volts versus the original 15V when new. I am an amateur in this...so what am I doing wrong? Why can't the batteries reach the projected 7.2V? How can I charge these? Thanks.
You can quickly damage lithium batteries or create a safety hazard by charging them without regards to their special needs. They are not like the old NiCD's that could tolerate overcharging and relatively primitive brute force chargers. There are circuits on the web for charging lithiums. The better designs which will include current, voltage, state of charge, cell equalization, and temperature monitoring can be quite complex.
Rather than try to reinvent the wheel, see if you can find a 7.2 volt LiPO battery made for a digital camera and a charger that is appropriate for the battery you choose.
Don
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