Helicopters

There is not a slowest helicopter in the world, hovering can be at 0 mph!

The OH-58D was an upgrade of the OH-58C scout helicopter for the US Army that had a 4-bladed rotor system and a Mast-Mounted sight that looks like a basketball on top of the rotor. The OH-58C had been used by the US Army from around the time of the Viet Nam War in the 1970's and is a military version of the Bell Helicopter Model 206. Then Bell won a contract to design and build a modern scout. They designed their first 4-bladed rotor with a composite yoke that would give the helicopter more stability. On top of the rotor they mounted a Mast-Mounted sight that included TV and Infra-Red. The OH-58D was unarmed and worked in tandem with the AH-64 helicopter gun ship that had just entered Army inventory. The OH-58D could hide behind trees or a hill and only have the Sight exposed. It could spot a target and "paint" it with a laser designator. The AH-64 would fire a Hellfire laser-guided missile from behind the hill and the missile would find the laser beam and track to the target. The earlier OH-58C was a 2-bladed helicopter with a "teetering" rotor. It is easy to spot the OH-58D by the 4 blades. However, the helicopter can be parked or transported on a cargo plane with the blades folded back. But the large Sight on top of the mast is easy to recognize (but the Army has also mounted a similar sight on some AH-64 and named the "Longbows".) Then in 1989, Iran began to cause problem in the Persian Gulf. The US Navy went into the Gulf to restore order but were being attacked by small gunboats that could launch missiles or torpedoes. The US Navy tried to use lightly armed Hughes scout helicopters (flown by the Army) but these were not effective. The Army requested Bell upgrade the OH-58D to arm it with some kind of missile. The entire "back seat" of the OH-58D is filled with electronics. Bell made some changes and ran a fast program to test the OH-58D with one(1) hellfire missile mounted on a side rail. This would allow the OH-58D to search and destroy enemy gunboats. The helicopter's performance was degraded a little with the additional weight and drag. The OH-58D is being replaced in the Army by the RA-66 (I believe that is correct designation).

This all depends on a helicopters model, weight, average speed, tank size etc etc, I would guess between 2-6 hours on average...

They may have none, or 3 or 4, or even more, depending on the type of helicopter.

Some (such as jet commuter helicopters, or the Mi24 Hind) have a simple tricycle arrangement of 3: one nose wheel and one on each "leg". Larger ones may have 2 at the main struts and even at the nose gear. The AH-64 Apache reverses this arrangement with 2 main wheels and a small tail wheel.

Some helicopters do not have wheels but have skids. Some have small wheels built into the skids to make moving them easier. The AH-1 Cobra and some early police patrol helicopters had skids.

Large military helicopters such as the CH-47 Chinook have 4 or 6 (2 double front wheels) built into the undercarriage.

Sikorsky are a manufacturer of helicopters. In much the same way that Ford are a manufacturer of cars.

As a manufacturer of helicopters they make more than one type, so your question needs to be a little more specific.

Even if you name a specific model, there will be different roll-fits which will each have a different weight. The Sikorsky CH-53E has a maximum design gross weight of 46,500 lbs. Its maximum design gross weight with an external load is 73,500 lbs.

It is used to control its movement

Marine One The president does not have a specific helicopter.

However as soon as he boards, any US government aircraft regardless of type, it automaticlly becomes designated as "Air force one" The president actually has a whole Marine Helicopter Squadron dedicated to his disposal. It is designated HMX. HMX-1 a sikorsky H-3 is Marine One. If the president gets on any helicopter piloted by Marines it becomes Marine One. So if Honorable Mr. Obama was to get on my CH-53E that I crew chief on... you guessed it... it becomes Marine One. This is correct with the exception that if that aircraft is flying to meet the president it flies under its regular call sign

Marine One. Marine One.

I'm going to assume that you are talking about full size actual helicopters (not models).

You could try following the link below, this will give you an idea of the current secondhand helicopter market (in USD). You'll be looking at around $200k upwards depending on age.

Hope this helps...

You can also see used helicopters here:

noviktrade.com/helicopters.html

Prices are low, helicopter is fine.

My uncle has bought mi-2 for 500,000USD and he is happy about it.

The helicopter is widely used for executive transport, search and rescue, and utility. It's used here because of it's versatility, smoothness, and ability to hover and move backwards. While it can do these jobs and more, it uses fuel much quicker than airplanes do.

There is no reason why you could not approach the manufacturer and take out a build contract to have one made for you.

How far can helicopter fly on a one tank of gas

Some helicopters are used as a means for touring the park. This is done by private companies outside the National Park Service.

Helicopters are also used for Search and Rescue operations and Medical Emergencies to locate and retrieve injured (or killed) people in the parks.

Helicopters can be used for resource management goals including surveys, noxious plant control, and wildlife handling.

No. There is nothing to counter the rotational force of one rotor.

Helicopters are "rotary wing" aircraft- their wings are the rotor blades. Instead of deriving lift from moving air over the fixed wings of an airplane, a helicopter derives lift by moving the wings through the air.

Matthew Harding

it is a nut that holds the main rotor to the mast of some helicopters. The Jesus Nut is the large nut on the top of the mast that holds the entire rotor blades and rotor mechanism to the mast. Bascially, it holds the weight of the aircraft by the top of the mast and if it should fail, then all you can do is say "Jesus!".

The range of rotary and fixed wing aircraft is variable to type, speed, conditions, and fuel capacity. Furthermore, the use and capability of air-to-air refueling can increase the range and endurance of aircraft almost indefinitely. Some rotary wing aircraft can also carry supplemental fuel tanks and bladders to further increase range.

Yes, but in very limited numbers, and mostly for reconnaissance or rescue missions. The Sikorsy R-4 was the first mass-produced helicopter, and saw use in the China-Burma-India theater of the war.

MASH

I doubt that any helicopter can fly from Antarctica to Australia.

There are lots of types of aircraft on the world.

Aircrafts are separated by engine number, fuselage dimensions, engine types, military or civil, passenger, cargo and helicopter.

If the thrust is directed straight down and torque is counteracted, the weight it can lift is less than 45 pounds. It requires at least 45 pounds of thrust just to make 45pounds of vtol aircraft hover . It takes more than that to make it climb vertically up. To climb implies an acceleration against gravity and it takes at least 45 pounds thrust just to balance gravity's pull against a 45pound mass. With a winged aircraft the thrust can be less than the total weight of the aircraft and it can still fly and climb with less thrust than the mass of the plane. A high lift to drag ratio of the wing and effective wing area means that the thrust of the plane overcomes the drag of the plane. The wing's passage through the air creates the lift. The drag caused by the creation of 45pounds of lift is less than 45 pounds for an efficient wing.

Helicopter blades act in the same way as the wings of an airplane. They generate lift with the air flowing faster on the top of the airfoil then on the bottom. When you reach a certain speed, depending on blade specifications and limits, the air flowing over the blades become equal on the top and bottom of the airfoil. This is what is known as blade stall. The blades no longer generate lift. The same effect in fixed wing aircraft is known as a speed stall. This concept also takes place when a helicopter flies too high. As the air thins with altitude eventually there is not enough air for the blade to "bite". Thus blade stall again.