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    May
    01
    2009
    0

    Understanding propeller sizes

    I think it has always been a problem sellecting the perfect size propeller as specialy for new flyers. Selecting the correct propeller size for your rc airplane is very important, if you want to get the best performance from your engine whether it is a glow motor or electrick. Prop selection can be a bit of a headach, but there are some common recommendations of prop size for each and every engine. The first and foremost plan of attack is to follow the airplane manufacturer’s recommendations for the plane (and engine) that you have. You’d be forgiven for just seeing your airplane’s prop as the thing at the front of the plane that spins very fast, but understanding a bit about how it works is no bad thing. Propellers for rc airplanes are nothing more than vertically mounted rotating wings. Their job is to convert the engine power in to thrust, to pull/push the plane through the air. Thrust is generated in exactly the same way as lift is by the wing, and that’s why props have a profiled airfoil section. Propellers are designated two measurements, both given in inches…

    Propeller Mesurements

    Propeller Mesurements

    The first digits is the diameter of the imaginary disc (‘arc’) created by the spinning prop ie the length of prop from tip to tip. The second set of digits is the pitch, and this is the harder of the two to understand. The pitch measurement of a prop indicates how far that propeller will move through the air, for every single turn. However, the pitch measurement of your prop must only be taken as a guideline because real-life factors come in to play to influence this distance eg the material of the prop, its condition, air density… So, pitch measurement is really only a theoretical value, but is good enough to let you choose the right size propeller for your airplane. The higher the pitch, the faster your plane will go. One way to see it is to imagine the gauge of two different screw threads, coarse and fine, and picture both screws turning at the same speed viagra pharmacie sans ordonnance. The coarse thread will cut in to the material a lot faster than the fine one will. It’s the same for propellers. In the illustration below, the two arrow lines represent the path of each propeller tip. You can see that the higher pitch prop (eg 10×8) takes only one and a half turns to cover the same distance that the lower pitch prop (eg 10×4) takes 3 turns to. So, conversely, with both engines and props spinning at identical RPM, the higher pitch prop will travel further, in the same amount of time. Again, remember that this is only true for a theoretically perfect world! 

    Propeller explination

    Propeller explination

    Selecting a different pitch prop is going to significantly change your airplane’s performance, speed being the biggest factor. The diameter of the propeller (10″ in the example above) will also effect how the airplane flies, but also how the engine runs and, again, following your airplane manufacturer’s recommendations is the place to start. Roughly speaking, diameter influences the amount of torque generated, but an ever-increasingly and non-performance related issue these days, linked to prop diameter, is that of noise. A faster turning prop (and most props spin in excess of 10,000 RPM) generates a lot of noise as the tips cut through the air. In fact, when you hear a gas rc airplane flying, it’s more than likely the propeller that you’re hearing, and not the engine! So it’s important to note that a larger diameter prop reduces the engine’s RPM at any given power setting, because there is more for the engine to turn over, and hence more work to do. And slower turning props generate less noise – therefore, larger diameter props run quieter than smaller diameter props, all else being equal. Prop size recommendations as already mentioned, following the prop size recommendations made by your airplane’s manufacturer should always be your first point of reference. But, there are generally recognized prop size ranges for each engine size, and these are the sizes to choose if you’re unsure about propeller selection. The following propeller size chart is easy to use; select your engine displacement along the bottom scale, then follow the vertical line up to the shaded area, which gives the prop range for that engine.

    Proppeller Recomendation

    Proppeller Recomendation

    Written by David in: Uncategorized |
    May
    01
    2009
    0

    Effects that air have on a remote control plane

    High altitude has a noticeable effect on the performance of RC Planes. We use to stay in Durban and flew quite alot. We eventualy desided to move to Jahannesburg. We had a few flights, but could not understand why the performance of the plane was so bad, i meen, it was really shitty. It took for ever to take off and then i remembered, a good mate of mine told me that the we must watch out for the air in Johannesburg. The air is alot thinner in Jahannesburg because of the high altitude. For the same size Plane we would need a bigger propeller or even a bigger motor to give you the same performance.

    So this article is not just a lesson on thin air and altitude effects on your rc plane, but also about listening to the old dogs of the game. For some reason they not as stupid as they look.

    Thanks Mitch, thank you for your help and advice http://levitrakamagra.com/. Miss you guys alot.

    SO…….. gues were i am off to, will be buying a eFlight PARK-480 to replace my PARK-400. they Pricing at R500 now (not too bad ). But the motor is almost twice the size. Now the questions still hangs…….Will we build a bigger plane, or will i just try it in the normal standard size zagi.

    Well, i will see, Maybe we try both. So keep in touch, and watch this space, as i will post the results as soon as we have tested it.

    Hope to heer from all you readers.

    Written by David in: Uncategorized |
    Nov
    05
    2008
    0

    Slope soaring

    Slope soaring is a technique used to maintain altitude with a glider by flying in the updraft or compression produced by wind blowing

    (more…)

    Written by David in: Uncategorized |
    Nov
    05
    2008
    0

    Glow Plug

    A glow plug is similar to a spark plug, used to ignite the fuel in the very small engines typically used in model aircraft, model cars and similar applications. The ignition is accomplished by a platinum helical wire filament recessed into the plug’s tip. When an electric current runs through the plug, or when exposed to the heat of the combustion chamber, the filament glows, enabling it to ignite the special fuel used by these engines. Power can be applied using a special connector attaching to the outside of the engine, and may use a rechargeable battery or DC power source.

    Glow fuel consist of methanol and sometimes if you wish, a percentage of nitromethane for greater power, and castor oil for lubrication and heat-control. Glow fuel burns when ignited by the hot wire of the plug. Between strokes of the engine, the wire remains hot, continuing to glow partly due to thermal inertia, but largely due to the catalytic combustion reaction of methanol remaining on the platinum filament. This keeps the filament hot, allowing it to ignite the next charge, thus sustaining the power cycle.

    To start a glow plug engine, a AA battery is applied to the glow plug, initially heating the filament. The engine is then spun from the outside using a manual crank, spring-loaded motor, or hand to introduce fuel to the chamber. Once the fuel has ignited and the engine is running, the electrical connection is no longer needed and can be removed. Each combustion keeps the glow plug filament glowing red hot, allowing it to ignite the next charge, thus sustaining the power cycle.
    Glow plug engines can be designed for two-cycle operation (ignition every rotation) or four-cycle operation (ignition every two rotations). The two-cycle (or two-stroke) version produces more power, but the four-cycle engines have more low-end torque, are less noisy and have a lower-pitched, more realistic sound.

    What to considerations when using glow plugs

    • ” High-nitro fuels produce more power than low-nitro fuels, but also produce more heat. The higher the nitro content, the colder the plug, also due to the lower methanol content.
    • ” Depending on engine type, usage of a turbo plug may be required. For turbo engines use turbo plugs http://ca..cialis-canada/. Never install a turbo plug in a standard engine or vice versa.
    • ” Big engines have more mass and retain heat better. Smaller, lighter engines don’t, and need the help a hotter plug can offer.
    • ” The “right” plug for an engine can change with the temperature. The hotter the day, the colder the plug.
    • ” Hot plugs promote better idling and acceleration. If your engine runs rough or accelerates sluggishly, a hotter plug will help.
    • ” Cold plugs produce more power and may improve performance if your engine runs hot. The downside is rougher idling and more difficulty in tuning.
    • ” For cars: If the track/course has a lot of twists and turns, a hot plug is fine. If the track/course has long straights where you’ll reach maximum rpm, a colder plug is best.
    • ” Over-leaning an engine can harm it, by raising operating temperatures; “burn up” a plug inside it’s product lifetime.
    • ” Higher nitro means hotter fuel: needs colder plugs, and vice versa.
    • ” If the engine sags when the battery is disconnected, the plug is too cold or more nitro is needed (or the plug is at the end of its life), and if the engine bites back or backfires when hand cranking, the plug is too hot or less nitro is needed.
    • ” Glow plugs get very hot, enough to glow the filament red or white hot, and removing a glow plug while power is applied can cause burning if appropriate care is not taken. Special caution must be taken while near fuel sources.
    • ” Some connectors for glow plugs can short circuit and damage batteries, or cause them to explode. Batteries may get hot during the use of a glow plug. This especially applies to home-made or nonstandard connectors.
    Written by David in: Uncategorized |
    Nov
    05
    2008
    0

    Gliders

    A glider is an aircraft with no motor which relies on compressed wind against a hill to carry it. The design of the gliders enables them to climb using rising air and then to glide for long distances before finding the next source of lift. This has created the sport of gliding, or soaring.
    Although many gliders do not have a motor, there are some that use engines occasionally.

    Some of the new Gliders come with a motor and a Fold away prop, so that there isn’t any drag slowing it down when the motor isn’t running. If for some reason the glider needs to get some more speed for what ever the reason is, the pilot can accelerate and the motor will kick in and give the glider the power needed to sustain flight http://cialisviagras.net/.Glider can be launched by hand, winch or it can be self launched by means of an internal motor.

    If you are standing on the edge of a ridge with some nice strong wind you can hand launch the glider in the direction where the wind is coming from. With winch launching a long rope is attached to a hook on the glider, the other end of the rope is attached to a motor, reeling the rope in. As soon as the glider goes passed a certain point , the hook releases the rope and the glider is free to glide.

    You can find plans and help to build your own glider at http://www.scratchbuild.co.za . If you already have one and dont mind helping others, join us there anyway.

    Written by David in: Uncategorized |
    Nov
    05
    2008
    0

    Radio-Controlled Aircraft

    A radio controlled aircraft is a model aircraft that is controlled remotely, typically with a hand-held transmitter and a receiver within the craft. The receiver controls the corresponding servos that move the control surfaces based on the position of joysticks on the transmitter, which in turn move the plane.
    Flying RC aircraft as a hobby has been growing worldwide with the advent of more efficient motors (both electric and miniature internal

    (more…)

    Written by David in: Uncategorized |
    Oct
    21
    2008
    0

    Radio Control Model Gliders

    A glider is an aircraft with no motor which relies on compressed wind against a hill to carry it. The design of the gliders enables them to climb using rising air and then to glide for long distances before finding the next source of lift. This has created the sport of gliding, or soaring.

    Although many gliders do not have a motor, there are some that use engines occasionally. Some of the new Gliders come with a motor and a fold away prop, so that there isn’t any drag slowing it down when the motor isn’t running. If for some reason the glider needs to get some more speed for what ever the reason is, the pilot can accelerate and the motor will kick in and give the glider the power needed to sustain flight.

    Gliders can be launched by hand, winch or it can be self launched by means of an internal motor. If you are standing on the edge of a ridge with some nice strong wind you can hand launch the glider in the direction where the wind is coming from. With winch launching a long rope is attached to a hook on the glider, the other end of the rope is attached to a motor, reeling the rope in. As soon as the glider goes passed a certain point , the hook releases the rope and the glider is free to glide.

    You can get yourself a glider from any hoby shop that does model aero planes, or you can download a plan of your choice and build one yourself.

    At places like www.scratchbuild.co.za, you can either give help, or get help in building your own model aero planes. There is lots of places were you can look on the internet.

    BUT, the most impotant thing is, Have FUN !!!!!

    Written by David in: Uncategorized |

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