All glow plug rc model aero engines, whether 2-stroke or 4-stroke, are expressed as a certain size. Glow plugs for rc model airplane engines can be bought with different 'heat ratings' depending on the engine and flying conditions. It's a good idea to follow the engine manufacturer's recommendations when choosing a suitable plug.

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Electric models use small motors, powered by battery cells. Those motors should not be confused with glow engines — which are actual internal combustion power plants that form the heart of any 'gas' or 'nitro' powered R/C model. Most nitro R/C models use a 2- or 4-stroke glow engine, sized specifically for that model. Typically, they range in displacement from.049 cu.

(80cc to 20cc) — a variety that satisfies virtually any model's power requirements. Glow engines cannot be operated with the same gasoline you'd get at a filling station pump.

They require a special fuel, called 'glow fuel.' It contains methanol as the base, with varying amounts of nitromethane to increase the energy that the fuel can provide. Oil, pre-mixed into the fuel, lubricates and protects your tiny engine as it pounds out amazing power. When you get your new engine, first examine it carefully for any obvious defects. Read the operating instructions closely.

If the manufacturer suggests a specific procedure for breaking in the engine, by all means, use it! Two-Stroke vs. Most glow engines have a simple ignition system that uses a glow plug rather than a spark plug — so there's no coil, magneto or points. The glow plug is heated by a battery-operated glow starter; meanwhile, the modeler uses a recoil starter, Electric 12V Starter or Starter Box to turn over the engine. When fuel enters the combustion chamber, it's ignited by the heated glow plug — and with that, the engine springs to life, instantly gaining the momentum to continue running after all the starter accessories are removed. The engine's carburetor supplies the fuel and air needed for combustion. It has several adjustments.

A rotating throttle arm controls the AMOUNT of fuel and air that enters the combustion chamber. The high-speed needle valve controls the MIX or proportions of fuel vs. Air at mid- to high-speeds. The idle mixture screw is similar to the high-speed needle valve, except that it controls the mix of fuel and air when the engine is only idling.

When you've adjusted the high-speed and idle mixtures properly, your engine should operate smooth and steady throughout its speed range. Tower Hobbies has many available with helpful information about glow engine operation and maintenance. R/C trainer planes are usually designed for.40-class 2-stroke glow engines, and often fly best with engines from the lower end of their recommended ranges — a.40 cubic inch engine will work fine with a '40 size' trainer. The plane's requirements might indicate that a.46 or even larger size is acceptable.

But in this case, bigger is not necessarily better — the larger engines will require more throttle control from you. And you have enough other things to learn! By contrast, seasoned pilots often gravitate toward the middle or higher end of the engine displacement ranges recommended for their 'sport planes.' That's because the added power gives their aerobatic maneuvers more oomph.and the pilots themselves have the experience to handle it.