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They do have a “memory” and do not like to remain in an uncharged state for a long period of time. These batteries should be replaced after two or more flying seasons. They are the type of batteries typically provided with the RC system. They can be recharged easily with most field chargers.
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NiMH – nickel metal hydride batteries provide a longer battery life, and are relatively safe. They are about the same weight as the NiCD battery, but tend to provide a longer service on a single charge. These batteries should not be charged with a NiCD charger. Most of the newer field chargers allow for NiMH charging. I personally have seen a fire in a model due to a malfunctioning NiMH battery, so I do think they deserve respect, however I continue to use them and believe they are as safe as anything else which we use.
LiPo or LiIon – Lithium polymer or Lithium ion batteries are the newest innovation in modeling. They have been around for a while, and actually got their origin from the space program. These batteries come in several forms, from the light weight foil packaged battery, to the more sturdily packaged battery pack. They are more expensive, but provide an incredible amount of power for their weight. They have revolutionized the electric flight realm. They do however command a certain amount of respect and caution. These batteries have been documented to burn explosively when handled inappropriately or charged in the wrong manner. You should never charge these batteries with anything except a LiPo/Li-ion charger and then only when the charging process can be monitored. Some even recommend charging in a blast bucket, or bucket of sand to minimize chances of a fire.
You must utilize caution and vigilance when using these batteries. Ask the staff at the hobby shop if you are unsure about what you are buying or if the charging units are appropriate for the batteries you have purchased.
A field charging device will be one of the most useful tools in your flight box. It can be used to charge most any batteries you have, from glow plug
driver to starter battery.
Engine Selection – Four stroke vs. Two Stroke
You have decided to buy a glow powered model, and are having a difficult time deciding which engine to buy. Too many choices and variable prices can make this decision a tough one.
Two strokes are cheaper, and provide an excellent source of power for most of our models. They are fairly easy to “tune” and maintain, and most of these engines, if taken care of, will last thru many years of regular use.
Four stroke engines are very reliable and provide a tremendous amount of power. You can typically swing a larger prop with the four stroke engine, than with the comparable two stroke engine. They are ideal for scale applications, and they tend to be quieter than the two stroke engines. The down side of the four