How Do Helicopters Fly

Table of Content

• Turbine Helicopter Engines
• Tail Rotor Drift And Tail Rotor Roll
• Diesel Helicopter Engines
• Making a Really Simple Small Paper Helicopter
• Introduction: How to Make Aeroplane Using DC Motor
• Build-It-Yourself Helicopters
• What materials are used to make a toy helicopter?

The paper clip is attached in order to give your helicopter a little weight. You will be folding the ends of the long dimension of your original index card. Fold one side first and then flip the paper over so you can fold the other side.Once both sides are folded, open them both up halfway. These folds have now formed the wings of your helicopter.

Ground resonance can be caused by a combination of vibrations in the rotor head and the center of gravity of the rotor disc not being over the center of rotation. If this occurs, a ‘wobble’ will develop, the effect being similar to an unbalanced flywheel rotating at high speed. Unbalanced rotor blades, faulty or unserviceable drag dampers, or incorrect rotor blade tracking, may be responsible. How does this flapping work to control the dissymmetry of the lift?

Turbine Helicopter Engines

So students learn to land on grass first since this is very much easier than landing on asphalt or tarmac. When landing on a hard surface, you have to hover lower and lower, and somehow push through the ground cushion, while not forcing the helicopter onto the ground. It’s not as difficult as it sounds, or as some students think, but it does take a fair amount of skill and finesse.

In a steady hover in still air, it should be intuitively obvious that the spinning blades will all produce an equal amount of lift. However, with a headwind, or once the helicopter starts to move forward, this is not the case. If we assume a hover with a ten-knot headwind, the advancing blade – that is, the blade moving into the wind – now has an airspeed of twenty knots more than the retreating blade, which is moving in the opposite direction. To put it another way, if the rotor RPM is X knots, the advancing blade has an airspeed of X + 10 knots, and that of the retreating blade is X – 10 knots.

Tail Rotor Drift And Tail Rotor Roll

This will assure that you do not accidentally cut too far. Want to make a fun, simple, and quick project with a child but don't have a lot of supplies or ideas? When you drop this helicopter from your hand it will slowly spin until it reaches the floor. You will only need a piece of paper to make it but you will see how much fun can be had with a very simple toy. RotorWay customers can also go straight to the factory.

So are helicopters harder to fly than an airplane? Airplanes are easier to fly as they are an aerodynamically stable aircraft which means they want to fly. Helicopters are an aerodynamically unstable aircraft which means they do not want to fly. The best way to test any homemade helicopter is under tethered restraint.

Diesel Helicopter Engines

I spend an average of 20 hours reading everyday. Here on this blog, documenting my knowledge. People of all ages may enjoy this homemade project! One big crate stores dozens of lumpy, shrink-wrapped cardboard sheets. This is how RotorWay packages smaller parts like snap rings, pins, nuts, and bolts, which if shipped en masse in plastic bags could wind up in the wrong holes. Every part has a unique number to match a step in RotorWay’s notebooks and DVDs.

This means that each blade is an aerofoil that, when placed in an airflow, deflects the air in order to produce lift. The rotor blades are pitched lower in the front of the rotor assembly than behind it. This increases the angle of attack — and creates lift — at the back of the helicopter. The unbalanced lift causes the helicopter to tip forward and move in that direction. Military surplus turbine engines have been popular on ebay over the years though gaining higher asking prices and lower availability.

While a two stroke engine certainly could take you the distance, it would be more suited as a paddock hopper rather than a serious cross country contender. They are more sensitive to old fuel/fuel contamination issues. Always oversize your two stroke helicopter engine requirements for an added margin of safety. So glad to have found paper helicopters instead and my son can enjoy it more without tearing paper apart."

This means that the advancing blade has more lift, and if nothing were done, the helicopter would roll sideways and crash. The magnitude of TRT is changed by increasing or decreasing the pitch angle of the rotor blades, and thereby their angle of attack. The pilot does this by using the collective or lever on his left side, which ‘collectively’ alters the pitch of the blades. And as with any aircraft, when the lift is greater than weight the helicopter will take off – or in this case, lift into hover.

Making a Really Simple Small Paper Helicopter

The few that have made it to testing and production also come with a significant price tag and as yet, no sound long-term history of performance. Another popular option are the european diesel auto conversions. They have found some success in fixed wind aircraft though there use in rotary wing aircraft has yet to be proven. There are other complications once we actually start to fly the helicopter.

Why spend thousands of dollars only to find you need more time than you first thought. Crease the fold with your finger or the edge of your paperclip. Then fold it in half lengthwise again, remembering to crease this fold as well.The width of your index card will now be one quarter what it was to begin with. You will only need one 5 inch (12.7 cm) by 7 inch index card and one paper clip. Use various sizes of paperclips, see which works best.You can also cut the wings, so they are thinner or thicker, to get the best flight.

Introduction: How to Make Aeroplane Using DC Motor

However, increasing the lift also means that there is more drag. So when the collective is raised, the pilot needs to open the throttle to produce more engine power in order to prevent the rotor blades from slowing down. In most modern helicopters there is an electronic governor that monitors the rotor RPM and adjusts the engine power as required. Ground Resonance is another aerodynamic effect that can happen during take-off and landing. This is severe vibration resulting from the oscillation of the helicopter when in contact with the ground. The onset is a slow rocking of the fuselage, and if no remedial action is taken early, the vibrations can increase until the helicopter sustains major damage.

Before scheduling work where he would fly another’s kit helicopter for training or testing, he requires the new customer to fill out a long and sobering checklist. It can make landings quite difficult, particularly for the student pilot. Landing is achieved simply by hovering lower and lower until the ground is reached. But as you lower the collective and get nearer and nearer to the earth, the ground cushion cannot easily escape and becomes compressed, and it can actually stop the helicopter from descending. Unfortunately, this cushion of air is not a stable platform, and the helicopter may well start to slide across it. It can feel to the pilot as though the helicopter is dancing erratically over a solid surface, and in fact the aircraft can literally fall off the ground cushion, possibly resulting in a heavy landing with sideways movement.