Showing posts with label Autogyro. Show all posts
Showing posts with label Autogyro. Show all posts

Saturday, September 16, 2023

Radio transmission is the weak point of modern military drones.

 Radio transmission is the weak point of modern military drones. 


The new British military jet-propelled "Hydra 400"quadcopter is an interesting design. 


The new jet-propelled drone is an interesting design. The jet-propelled quadcopter can fly fast. And it can raise more cargo from the ground than electric engine drones. There is a possibility that these kinds of quadcopters can used as "quad autogyros". 

In those designs, the quadcopters use their quad rotors for lift-off and landing. During a long-distance flight. The drone can use free-rotation propellers and a jet engine. And that thing makes those drones fast. 

Those drones can used as kamikaze drones. Or they can launch missiles like Javelins if they are connected to them. The kamikaze quadcopters are interesting tools because they can observe the area. And if there are no targets those drones can return to base. 

But if there are some kind of targets the drone can make it's surveillance mission and then attack targets when their flight time ends. The drones can use an image-recognition homing system that allows them to take out targets with very high accuracy. 


Above Hydra-drone. 

The military is interested in independently operating drones is that those drones don't require full-time communication between the drone and HQ. The Ukraine war shows how dangerous full-time radio communication is. If the electronic intelligence finds the transmitter, the enemy can turn every cannon against those command centers. So the kamikaze-recon drone can transmit data to the command center and then dive against the target. And that helps to hide the place of the command system. 

The full-time operating radio transmissions are dangerous for drone swarms. The drone swarm where hundreds of members is a suitable target for large anti-aircraft missiles or AA grenades. Similar ELINT systems that are used for track radio transmitters also aim AA cannons at those drone swarms. High-power radio waves can jam the data communication in that drone swarm. 

Those missiles could equipped with a similar homing system as HARM (High-speed Anti Radiation missiles). The HARM-type missiles are also deadly against any radio transmitters. 

Normally HARM is shot from the aircraft. Portable shoulder-launched Stinger missiles also have a so-called "Anti-radiation variant" called Stinger ARM (Anti-Radiation Missiles) that can detect and destroy enemy radiation sources. That makes radio telephones missile magnets if the enemy can track their positions by using radio detectors. 

But there is the possibility that those missiles can be mounted on rocket launchers or warships. Warships can also use those missiles against enemy surface combat unit's radars. And that means the artillery rockets and grenades can have a warhead that can detect radio transmitters. 


https://interestingengineering.com/military/british-army-jet-propelled-drones


https://en.wikipedia.org/wiki/Autogyro



Saturday, June 9, 2018

The new type of helicopters are not new ideas


Picture I

Kimmo Huosionmaa

The problem with the helicopters is that they are not very fast, in the comparison between aircraft, and the second thing is that sometimes helicopters are so noisy. When the SWAT-team would land on the roof of the building, they normally want the operate silent, or that's what normal people think because that allows them to make surprise attack to space, where the target is.


If the helicopter would be hit by weapons, it should land safely, and that's why there should be used the autorotation if there would be problems with engines. Autorotation is the thing, what is used in the "Autogyros", and it means that the rotor of the helicopter would let rotate freely, what would be slow the dropping speed. The same system, what makes helicopters safe in the landing situation, makes it silent. The idea of the Autogyro is not new. In the medieval time were created the toys, what were landed slow, when they were thrown in the air.

NACA (National Advisory Committee for Aeronautics)
 Autogyro from the year 1931
Picture II

Those rotor-toys gave an idea to Juan de Gierva to make the worlds first Autogyro. In the movie "007 and the Moonraker" James Bond used Autogyro against bad guys helicopters, and in some rumors,  the CIA and MI-6 have those small Autogyros, what are equipped with "Stinger" missiles and lightweight anti-tank weapons like Bofors RBS-56 "Bill". Also, light machine guns can be used in this thing, what could be effective against some drug baron. Those lightweight aerial vehicles can be also used in mercenary-operations around the world.

Picture III


If the rotor of the helicopter would be equipped with the connector, what is used in cars, the pilot can turn the power off from the main rotor, and then the helicopter would land without noise. But when we are thinking about Autogyros, we can build them to look like the normal helicopter. When the Autogyro is going airborne, the power would be connected to the main rotor, and the system acts like the normal helicopter. And when the pilot wants to fly fast, the power would switch off the main rotor, when the helicopter would increase the speed.


But when we would want to make the helicopter, what can fly as fast as the airplane, we would face the problem, that the main rotor would not stand the speed. This is why there have been created the system, what is known as the "disc rotor". That system is actually the disc what increases like the pancake when the speed of rotor would increase, and when the speed of rotor would decrease, the size of the disc would decrease. This would give a chance to make faster helicopters or Autogyros than ever before.

Sources

https://en.wikipedia.org/wiki/Autogyro

https://en.wikipedia.org/wiki/Pitcairn_PCA-2

Film of disc rotor in action

https://www.youtube.com/watch?v=d8AEfFZXG1c

Picture I

https://taskandpurpose.com/wp-content/uploads/2017/04/Screen-Shot-2017-04-20-at-6.15.24-PM-840x420.png

Picture II

https://upload.wikimedia.org/wikipedia/commons/9/9b/The_Pitcairn_Autogiro_%289467667452%29.jpg

Picture III

https://i.ytimg.com/vi/d8AEfFZXG1c/hqdefault.jpg

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