The Helicopter

The helicopters are a class of aircraft that fly "sucking" air from the bottom and pumping it with a thrust equal to its weight (in the case of hovering, that is, to stand still in air) or with greater thrust (for crawling towards the 'top: climbing).

The movement is generally provided by "direct" the flow of air in a different direction from the vertical. On this page of notes (which gave rise to a much longer article, but still do not know where to publish) we assume for simplicity helicopters "single-rotor" (like what you see in the picture at the bottom of this page).

Bernoulli's Law tells us about the behavior of fluids that given a reference surface (assuming the area "swept" from the rotor head), the sum of the static pressure and dynamic pressure remains the same - in our case, is "above "and" below "the helicopter.

This means that the air velocity in the rotor is greater than the one above the rotor (otherwise we would have an upward pressure, that is, the rotor would push down the helicopter instead of "keep it up" against the force of gravity). For the same reason, the air pressure beneath the blades is also increased (we're still hiring - for simplicity - the column of air that has entered the helicopter at that time).

The air sucked from the rotor will expand back to normal pressure at a higher speed - with simple calculations we obtain a factor of 2, ie the rate of output ("under" the rotor) is twice that of entry.

Because the helicopter can hover must be in balance the thrust force of gravity applied to the mass (commonly - and not entirely accurately - we would say "weight") of the helicopter.

So, given the weight and size of the helicopter rotor, one can calculate the minimum power is needed to balance the force of gravity (ie to keep the helicopter in flight).

We see that if the surface of the rotor increases, the required power decreases (but since the value is under the square root, the decrease is not linear).

S029 Dolphin 3CH RTF RC Helicopter

S029 Dolphin 3CH RTF RC Helicopter Features

• S029 Dolphin 3CH RTF RC Helicopter
• Marine Helicopter

S029 Dolphin 3CH RTF RC Helicopter Description

          Feature: Function: Up/Down, Left/Right, Forward/Backward Product is 100% new in box FULLY ASSEMBLED, READY TO FLY Full scale remote control 360 Precise Directional Movement FM radio control 3D fuselage Extremely easy to control Newly designed super strong crashworthy propeller Super lightweight airframe Ready To Fly, Easy To Fly   Specification: Size: 31(L) x 6.5(W) x 15(H) cm; Main rotor diameter: 25.5cm Battery for controller: 4 x 1.5v AA batteries Battery: 3.7V Li-Poly Charge Time: about 90minutes Flight Time: 8-10 minutes Aviate Height: approx. 30m Control Radius: approx. 30m  Package Include: 1 x 3-Channel RC Helicopter (battery included) 1 x Remote Control (battery not included) 1 x 110V-240V AC Charger 1 x Screwdriver 1 x Spare Tail Rotor Blade Operation Manual

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 S029 Dolphin 3CH RTF RC Helicopter

*** Product Information and Review : Sep 20, 2011

4 Red Syma Replacement Sets of the Main Rotor Blades for S107 Red Part S107-02 (16 Rotors in all)

4 Red Syma Replacement Sets of the Main Rotor Blades for S107 Red Part Features

• 4 Sets of Main Blades (4 Blades in a set)
• Syma s107
• Red

4 Red Syma Replacement Sets of the Main Rotor Blades for S107 Red Part Review

          These blades are perfect replacements for the SYMA S105G and the S107G. They are a very inexpensive replacement part and the quality of the blades I received was exactly the same as the factory installed originals. The price was really great, as well!

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 4 Red Syma Replacement Sets of the Main Rotor Blades for S107 Red Part

*** Product Information and Review : Sep 19, 2011

4 Sets of Yellow Syma Replacement Rotor Blades for S107 (16 Blades in All) S107-02

S107-02 4 Sets of Yellow Syma Replacement Rotor Blades for S107 Features

• 4 Sets of Main Blades (4 Blades in a set)
• Yellow

S107-02 4 Sets of Yellow Syma Replacement Rotor Blades for S107 Review

          If your going to fly these mini helicopters your going to need spare blades. These are OEM blades and very nice. Get 'em now and keep flying after that big crash.

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 S107-02 4 Sets of Yellow Syma Replacement Rotor Blades for S107

*** Product Information and Review : Sep 18, 2011

Syma S107g-13 Helicopter Replacement Part - Main Shaft

Syma S107g-13 Helicopter Replacement Part - Main Shaft Features

• Main Shaft Replacement Part for the S107
• S107-13

Syma S107g-13 Helicopter Replacement Part - Main Shaft Review

          It works. And it's a good match for the original Syma 107g. I found it more intuitive to transfer the replacement head to my original shaft (with its intact drive gear) to replace the broken blade axles. I don't know how hard it would have been to remove the gear - I assume it would not be easy.

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 Syma S107g-13 Helicopter Replacement Part - Main Shaft

*** Product Information and Review : Sep 17, 2011

Full Replacement Parts Set for Syma S107 RC Helicopter, Main Blades, Tail Decorations, Tail Props, Balance Bar, -Yellow Set-

Full Replacement Parts Set for Syma S107 RC Helicopter Yellow Set Features

• Replacement Parts for Syma S107 Yellow Helicopter!
• 1 Set of Main Blades. Yellow
• 1 Set of Tail Decorations. Yellow
• 2 Tail Props
• 1 Balance Bar

Full Replacement Parts Set for Syma S107 RC Helicopter Yellow Set Review

          I love this toy and I am 60. I now have two and did get the spare blades which I advise. It is like being a kid again and have bought one for a friend too. This is for indoor use and is durable except the blades which are as well but if they hit an object can break. I can not believe they are so inexpensive and must be the best 20 dollars I have ever spent on myself hehe

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 Full Replacement Parts Set for Syma S107 RC Helicopter Yellow Set

*** Product Information and Review : Sep 16, 2011

Full Replacement Parts Set for Syma S107 RC Helicopter, Main Blades, Tail Decorations, Tail Props, Balance Bar, -Blue Set-

Full Replacement Parts Set for Syma S107 RC Helicopter Blue Set Features

• Replacement Parts for Syma S107 Yellow Helicopter!
• 1 Set of Main Blades. Blue
• 1 Set of Tail Decorations. Blue
• 2 Tail Props
• 1 Balance Bar

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 Full Replacement Parts Set for Syma S107 RC Helicopter Blue Set

*** Product Information and Review : Sep 15, 2011

Syma S030 3CH Bell 206 R/C Helicopter

Syma S030 3CH Bell 206 R/C Helicopter Features

• Alloy structure and unique design
• All-round 3 channel control
• Electronic fine-tuning provides a more stable flight
• New digital full 3D control remotely with power saving mode
• Full function: up/down, forward/backward, turning left and right and fixed-point hovering

Syma S030 3CH Bell 206 R/C Helicopter Review

          Now the amazing experience of real helicopter flight can be enjoyed by everyone. This 3-Channel Syma S030  R/C Helicopter is fully assembled with all pre-flight adjustments completed. The twin, counter-rotating, main rotor blade design totally cancels out main-rotor torque forces normally encountered with traditional helicopter types. The result gives you a very stable and gentle flight. This helicopter is very easy to fly, and is suitable for any level of RC helicopter enthusiasts.

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 Syma S030 3CH Bell 206 R/C Helicopter

*** Product Information and Review : Sep 13, 2011

What are the Radio Control planes?

Radio controlled, almost always refers to air toy designed to be controlled remotely using a sort of steering and guidance system. They are popular toys among children and adults, and are available in a wide variety of styles.

Originally, the radio control has been conceived as a method, during World War II missiles to navigate in dangerous places without putting the operator in danger. The technology never took off, however, and has been virtually abandoned since the war.

Most radio controlled devices use an analog control system, where a small pulse is sent from a handheld unit and received by the model. The model then interprets the width of the wrist to indicate in which direction, and to what extent, you have to move. Serve in a model airplane and turn, causing the plane to change direction. Recently, more expensive systems have started using digital controllers and receivers, which are much more reliable, and integrated fail-safe in case of signal loss.

Controller for the radio control devices are available in different levels of complexity. Some controls may be simple, allowing forward, left, right, up and down directions. Others may include a throttle valve and, for faster to change.

Radio control planes are built from different materials, including various types of wood (balsa is the most common), simple plastic and carbon fibers. Which can cost as little as $ 90, or up to $ 5000. Radio Control Plans may vary in power for two simple two-stroke engines up to large four-stroke engines. The size can vary from little more than a foot (30 centimeters), a full wingspan of ten to twelve feet (3-4 meters). The radio media plan will last 10-20 minutes in the air, flying at speeds ranging from 30 mph (48km / h) 200 mph (322 kph).

There are a number of hobbyists clubs for fans of radio air traffic control, are found in almost every nation on earth. The level of commitment ranges from fans than any other aspect of radio control airplanes, with some buying pre-made planes and meet from time to time to fly them, and the other floors of the building from scratch and enter contests and other competitions.

Syma S031G RC Helicopter with Lipo battery

Syma S031G RC Helicopter with Lipo battery Features

• Syma S031G New with Lipo battery set up
• 3 Channel Helicopter, 24 inches in length
• Great outdoor beginner RC Helicopter
• Flys Forward, Backwards, Left and Right
• LED Lights

Syma S031G RC Helicopter with Lipo battery Review

          Very solid piece of flying equipment. The gyro system is top-notch and only requires VERY minor trimming out of the box! Maiden flight was in a small kitchen area and stuck the landing perfectly! This model is the absolute, by far, the best I've used for beginner / advanced-beginner training. With such stable flight, you can really put the craft through the paces and focus less on over- / under-controlling the flight path. Pros: stabilized elevation stick, durable heli body with forgiving rotors, easy to set up and start flying, very responsive to all stick movements, VERY inexpensive replacement parts are available, and can move very fast when placed in the tail rotor 'boost' mode. Cons: wish it had the 4th channel for even further advanced training just short of moving to single-rotor equipment. Overall - couldn't be happier!

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 Syma S031G RC Helicopter with Lipo battery

*** Product Information and Review : Sep 11, 2011