What is a pitch link?
The pitch link is the vertical — or nearly vertical — member that connects the blade pitch horn to the rotating swashplate (Figure 50-1). Its sole function is to make sure the blade responds to the collective and cyclic control commands corresponding to the swashplate’s position.
What is teetering hinge in helicopter?
Teeter Hinge This central hinge allows the entire rotor head to tilt left and right in order to allow the blades to flap. When one blade flaps up, the other flaps down. The entire mechanical arrangement works like a child’s see-saw (teeter-totter) toy.
What is the thing on top of a helicopter called?
rotor
Overview. The helicopter rotor is powered by the engine, through the transmission, to the rotating mast. The mast is a cylindrical metal shaft that extends upward from—and is driven by—the transmission. At the top of the mast is the attachment point (colloquially called a Jesus nut) for the rotor blades called the hub.
What is the purpose of designing an underslung rotor system?
The underslung rotor system mitigates the lead/lag forces by mounting the blades slightly lower than the usual plane of rotation, so the lead/lag forces are minimized.
What does the coning hinge do?
The coning hinge relieves this stress, reducing the amount of reinforcing required and making for a lighter, easier to manufacture rotor blade. Additionally, the reduced bending of the rotor blade at its root allows the pitch-change axis to be better aligned with the blade’s centerline.
Why do helicopters need two pilots?
Flying a helicopter takes both hands and both feet. Someone has to tune radios, navigate, and just watch out of his side. The attack helicopters have two pilots so that one can shoot the guns. To fly if the pilot gets shot, and provide a 2nd set of hands and eyes when life gets interesting.
How does a pilot compensate for blowback?
The pilot uses cyclic feathering to compensate for dissymmetry of lift allowing him or her to control the attitude of the rotor disk. Figure 2-42. To compensate for blowback, move the cyclic forward. To develop a thrust force, the rotor system must be tilted in the desired direction of movement.
How many rpms does a helicopter blade spin?
Helicopters also make air move over airfoils to generate lift, but instead of having their airfoils in a single fixed wing, they have them built into their rotor blades, which spin around at high speed (typically about 400–500 RPM on a small helicopter or about 225 RPM on a huge Chinook, with the speed depending on the …
What is a low G pushover?
Pushing the cyclic forward following a rapid climb or even in level flight places the helicopter in a low G (feeling of weightlessness) flight condition. In this unloaded condition rotor thrust is reduced and the helicopter is nose low and tail high.
Is the Robinson R44 safe?
Between 2006 and 2016, Robinson R44s alone were involved in 42 deadly helicopter crashes. That is an average of 1.6 deadly crashes per 100,000 hours flown, a rate nearly 50% higher than that of the other dozen most common civilian models.
How can I change the pitch of my music?
You can also open files via URL. Select an interval in the file and shift the pitch by moving the slider left and right. After you finish editing, pick a format (mp3, m4a, m4r, flac, or wav) and click “Save” to download the file. Our free pitch shifter app allows you to shift the key of music keys without signing up or suffering through ads.
Do you need to download a Pitch Changer?
If you are looking to change the pitch in recorded voice, then it can be done using a voice pitch changer. Some pitch changer online can be used online thus eliminating the need to download the software.
Which is the best software to change the pitch of music?
Pitch Switch for Mac. This premium software is compatible on the Mac platform and can be used for pitch changing. The music files can be opened and features such as pitch and tempo can be changed by moving the sliders. It will be able to change the pitch of the sound file without causing any changes to the playback speed.
When did the Bell 429 pitch change link failure?
On 21 August 2015, a privately operated Bell 429, N429AR, experienced an in-flight tail rotor pitch change link (PCL) failure and subsequently landed safely in Port O’Connor, Texas. The US National Transportation Safety Board ( NTSB) report that during cruise the pilot: