What does the 70 duct mean in the model airplane, ask for advice!!

This means that the fan diameter of the ducted fan is 70mm.

Compared with an isolated fan of the same diameter, the ducted fan can produce greater lift, and the fan is enclosed in the duct, which can not only block the outward transmission of the fan's aerodynamic sound, but also has a compact structure, which can be used as the lift surface and flight control surface to construct a variety of small vertical take-off and landing unmanned aerial vehicles.

When this kind of unmanned aerial vehicle flies forward, the duct is in the complex airflow of the front incoming flow and fan suction flow, and its lift, drag and pitching torque have a decisive impact on the trim and even stability control of the whole aircraft.

The diameter of the inner wall of the ducted motor, the larger the diameter, the greater the thrust is relatively speaking, there are currently 30mm 50mm 55mm 60mm 64mm 70mm 90mm 120mm The largest thrust is 120mm of the twelve-page duct, the sound of cutting wind is similar to the vortex jet, and the thrust of 12s lithium battery is about 5kg.

The diameter of the inner wall of the ducted motor, the larger the diameter, the greater the thrust is relatively speaking, there are currently 30mm 50mm 55mm 60mm 64mm 70mm 90mm 120mm The largest thrust is 120mm of the twelve-page duct, the sound of cutting wind is similar to the vortex jet, and the thrust of 12s lithium battery is about 5kg.

All fucking fart and don't understand anything to mislead newbies. Also the motor diameter, laughed at me. I don't understand it, let me tell you, the standard size is the diameter of the fan blade of the duct, pay attention, it is the fan blade. This is not the case with some copycat factories.

It refers to the diameter (diameter) of the ducted machine, 70 mm, and sometimes you can also see 64 ducted, which means 64 mm, 70mm, 64mm

，64……etc. refer to the diameter of the duct, and its unit is mm. i.e. 70mm, 64mm, etc.

2. The main ducted motor used in the model aircraft is

It means that the fan diameter of the ducted fan is 70mm

It can be simply understood as putting the fan into a tube.

It can be understood as an electric jet engine, which can be **, there are pictures and truths.

Turbojet tyrants generally play tens of thousands, and the letter channel is generally a few hundred.

The reason why the remote control and the model airplane are purchased separately is that people who specialize in playing model airplanes generally have more than one airplane, and it is impossible for him to have an airplane with a remote control (a remote control can generally be used for multiple aircraft), so selling separately not only meets the needs of model friends for remote control, but also increases the range of remote controls.

The remote control distance of the model aircraft is generally within 500, to be within the line of sight (except for FPV), you should be a novice, the F16 you said is a channel fighter, fast, the novice can be said to be completely unable to control, should start from Cessna, Piao Piao.

At present, most of the ducted models are electric, one is because the electric production is convenient, and the other is because the petrol speed is low, which cannot meet the high speed requirements of the duct. Electric has a variety of advantages compared with gasoline, such as the power output can be directly controlled by the receiver, no need for throttle servo, the small model shell can withstand heating, small size, light weight, high thrust-to-weight ratio, higher energy conversion efficiency than oil-powered internal combustion engine, easy to debug and not easy to fail to cause air parking and other advantages. Of course, there are also gas-powered ducted models, such as the one equipped with a ducted turbojet engine, of course, the turbojet engine is used in high-end models, and most people still can't afford it.

Due to the high failure rate, the oil-powered ones are now relatively rarely used, and only a few models that need to be flown long distances or are used by some swimming enthusiasts.

Novices don't play ducts, especially 50 ducts, there is nothing to play, and the fun is not high, it is recommended to start playing with the propeller front pull model, Cessna and the like are very suitable, and the duct is very suitable for buying t45, it is very good to fly, and novices are also recommended to fly on the flight control to reduce the risk of blowing up.

Be careful not to bump into people and trees, and prepare more repair supplies such as foam glue. If you're a beginner, let's try an emulator first.

It refers to a layer of highway tunnel-like structure wrapped around the blades of the aircraft engine, which can restrict the airflow direction of the engine when it is working, make the intake and exhaust more smooth, the airflow output is stable, and improve the engine power.

The main reason for installing this kind of thing on the model aircraft is that the upper oar will not shake during high-speed rotation and make the oar more stable. The duct is not a necessary device for model aircraft, and the use of this device is called a model ducted aircraft.

The duct is generally composed of 3-6 blades, and its diameter is not large, generally a diameter of seven centimeters for a one-meter aircraft can be used. It is generally packed in a plastic cylinder, so it is also called an air duct or duct engine.

The speed of the duct is generally very high, but the efficiency is not high, compared with the propeller-powered aircraft is more efficient, but the duct is suitable for making real aircraft; The biggest advantage of the duct is that the diameter is small, and the aircraft made looks good, and it is not easy to break the propeller.

Model airplanes?

There is a kind of engine in a model airplane, that is, there is a cylinder on the outside of the motor and propeller, called a duct.

Such a model is explosive and is generally used in jet models, which is realistic, but expensive and consumes a lot of power.

Just look at the picture.

It's just that there is a cylinder outside the engine and the propeller, and this kind of engine has a very high speed. It is often used in model airplanes, fighter jets and real aircraft. However, the power consumption is high, and the high speed of the aircraft is difficult to control.

The duct is generally the main landing gear in the back, first aim at the runway to close the throttle, let it slide down quickly next to the ground is flattened, when the distance is about 20cm, and then slightly pull the rod to let the rear wheel land first, and then close the throttle and adjust the rudder.