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Wednesday, February 10, 2010

Glow Fuel


Glow Fuel, also called Nitro fuel, is a special blend of three main ingredients, plus a few minor additives. There are several different blends of nitro fuel available, suited to different types of engine and performance requirements.

The three primary ingredients are nitromethane, methanol and oil, the latter being either Castor or Synthetic. It's the nitromethane, of course, that puts the word nitro in to so many rc terms (nitro plane, nitro car, nitro engine...).

It's not necessary to don your chemistry lab coat and round glasses to understand rc nitro fuel completely, but a basic understanding of how and why it makes your rc engine run isn't a bad thing, so this page will try and explain those basics of nitro fuel...

Contrary to popular belief, nitromethane isn't the primary and sole explosive ingredient of rc nitro fuel. While it is very flammable, and does contribute to the fuel burn, the primary job of nitromethane is to get extra oxygen (necessary for anything to burn) into the fuel mix.
Because of the small volume of the combustion chamber of the engine, ordinarily the small amount of naturally existing oxygen just wouldn't sustain a good burn. Nitromethane, however, carries a relatively large concentration of oxygen molecules, thus greatly increasing the amount of oxygen available to burn within the combustion chamber.

The primary ingredient for the burn is the methanol. It's a type of alcohol that's very flammable, although not as much as gasoline, for example. But the combined explosive properties of methanol and nitromethane produce the power inside your engine. Aside from its high flammability, methanol has another characteristic useful for running engines - when it evaporates, it carries heat away from the surface it's evaporating from. You can notice this with any alcohol-based product, such as nail polish remover. Place some on the back of your hand and feel your skin get cooler as the liquid disappears.
Obviously, any cooling agent is going to be very welcome in an rc engine, where temperatures can reach in to the high-hundred degrees!

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The final ingredient of rc nitro fuel is oil, either castor or synthetic. Oil is necessary for the lubrication of the engine, to protect rubbing metal parts from wearing.

Castor oil is the traditional oil used in model aero engines. It's a natural oil produced from the castor bean and has excellent lubricating qualities. The downside with castor oil is that it leaves a gummy residue after it has burned, which with time can build up inside your model engine. If left un-maintained, this residue can build up and harden to a varnish-like surface, causing all manner of problems for your engine. And, because of the way it burns, castor oil will leave a bigger mess from your model's exhaust.Synthetic oil is one that has been produced from artificial, laboratory-produced chemicals. Synthetic oil, because of its artificial additives, burns cleaner than castor oil and won't leave a gummy residue inside the engine. The downside is that synthetic oil can be broken down by the other ingredients of the nitro fuel, particularly at high temperatures. If this occurs, obviously your engine isn't going to get the lubrication it needs.A castor/synthetic oil mix is an option, and this gives the best of both worlds; the cleanliness of synthetic and the better lubrication of castor.

When choosing a suitable rc nitro fuel for your model, you should follow the engine manufacturer's recommendations primarily. But, once you've broken your engine in, you can of course experiment with different fuels, by trying various blends.
The word blend refers to the concentration of each ingredient, and different blends are used for different performance requirements.

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The main percentage you'll see is the nitromethane content. This varies, and for rc airplanes it can range from a low 5% to a whopping 40%. For general sport flying, a 15 to 25% blend is normal. The other common percentage shown on rc nitro fuels is the oil content. For general flying, again, anywhere between 15% and 20% is considered to be a standard amount.Apart from the kind of performance you need from your engine, the other thing that will determine your fuel blend choice is whether your engine is 2 stroke or 4 stroke.

It's very important to store your nitro fuel well; always read the manufacturer's instructions on storing the fuel properly.While rc nitro fuel does have a long shelf-life, it can go off. One of the biggest dangers is moisture contamination. Methanol can easily absorb moisture molecules from the atmosphere, and if they do get in to the fuel then it's pretty much wrecked. A tell-tale sign will be small droplets of condensation on the inside of the fuel bottle above the level of fuel, or on the underside of the lid. If this happens, dispose of your fuel safely and replace it with new.Always read what the manufacturer says about storing your fuel, but keeping it in its proper container with the lid screwed tightly on, at room temperature and well away from any sources of ignition is the safest way.Because of how rc nitro fuel burns, it does leave an oily residue in the exhaust smoke. This can easily build up on the surface of your airplane, throughout a days flying. For this reason, it's always a good idea to take a bottle of fuel cleaner to the field with you, and get in to the habit of cleaning your model before going home.

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