How to Tune Your Model Airplane Engine

Written by Andre McFayden


Tuning is simply adjusting your engine for peak performance. The factory-fresh settings may be a good starting point. However, you may need to compensate for higher altitudes, or for temperature changes withrepparttar seasons. Changes in fuel type or engine wear, may also require a tune-up. Relatively more fuel to air is known as a "rich" mixture, whilerepparttar 116031 opposite is known as a "lean" mixture. A lean mixture generates more power, but also generates more heat. Too much heat could damagerepparttar 116032 engine. A rich mixture generates less power and less heat. Too rich andrepparttar 116033 engine might quit while you're flying.

The popular twin-needle carburetor has two needle valves. The high speed needle controlsrepparttar 116034 total fuel flow intorepparttar 116035 engine, and affectsrepparttar 116036 engine's behavior from half to full throttle. The low speed needle tends to have more of an effect from half throttle down to idle. Bothrepparttar 116037 low and high speed needles can be richened (counterclockwise turning), or leaned (clockwise turning). Tuning Procedure: 1) Start withrepparttar 116038 factory recommended needle valve settings. 2) Startrepparttar 116039 engine. 3) Withrepparttar 116040 engine or aircraft secured, openrepparttar 116041 throttle to full.

4) Leanrepparttar 116042 high speed needle slowly and watch and listen: Too rich: lots of smoke, low pitched sound Leaner: reduced smoke, sound starts changing to higher pitch Leaner still: little smoke, max rpm reached Too lean: very little smoke, max rpm can be heard falling off. Openrepparttar 116043 needle valve up 20 or 30 degrees from this point. If you have a tachometer, openrepparttar 116044 needle about 300 rpm less than max.

The powers of the mother of pearl

Written by Jakob Jelling


Oriental and Chinese cultures as well as many occidental ones follow traditions based onrepparttar belief that some precious stones have important symbolisms and powers. The mother of pearl is one of them, and it is often used for feng shui practitioners in order to attract a benefit towards a strategic house point or to improve a specific life area.

Some stones are believed to haverepparttar 116030 power of attracting happiness or love torepparttar 116031 life of whom carries them or keep them in their homes. The way in which a stone is seen and what it symbolizes depends not only on its type but also onrepparttar 116032 way it is used and seen by each specific culture andrepparttar 116033 traditions behind it.

Usually, in many occidental culturesrepparttar 116034 symbolism of a stone is followed by wearing it as a ornament and jewelry, while in many oriental cultures and mainlyrepparttar 116035 Chinese one, these stones are often used in symbolic objects which are strategically placed inrepparttar 116036 house. This way, stones depend onrepparttar 116037 way they are used and to which kind of object they are added to in order to have their meaning and to attract specific benefits.

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