I remember seeing this movie where when the helicopter got close to its target, it went into a quiet mode and you couldnt hear it anymore. Is this possible or was this just something made up for the movies? Please explain how this may be possible.
2007-01-15 23:48:29 · 6 answers · asked by Brett M 2 in Cars & Transportation ➔ Aircraft
The main THUMP THUMP you hear is as stated by others the interaction of the Tail Rotor turbulance with the Main Rotor Turbulance. As stated by others remove the tail rotor and you cut down on the noise. Also by increasing the Chord Width of the Main Blades, how thick and wide it is, you somewhat cut down on the noise. A good example of this is the Russian Hind and the MH-53J, both make more of a "whirling noise" then a thump. Even with all these modifacations you still have at least 2 turbines screaming and all that air being displaced. So a Silent helocopter is NOT a real option. Although, the AH-6 "Night Stalker" flown by the US Army's Spec Ops guys is a relitivly quiet machine.
Also a GOOD Speical Operations Helo Pilot will come in with the wind at low level, which can really cut down on the reaction time of people on the ground.
2007-01-17 21:59:36 · answer #1 · answered by Wolf of the Black Moon 4 · 0⤊ 1⤋
There isn't a whisper mode in existence that will make a helo quiet at the switch of a button.......by their very nature, rotating blades generate turbulence, which is impossible to completely disguise....any improvements would likely be across the board, as there isn't any one thing you can cut down on to induce a whisper mode (not without the helo plumetting from the sky anyway!). However, there are some helo's that are noticably quiter than others, mainly by cutting down the reveresed turbulence of the tail rotor. These are normally the models with unconventional tail rotors and multiple rotor blades (i.e., 4 or more) such as the McDonell Douglas MD600 and Explorer models with the NOTAR system and the Eurocopter EC145 and Dauphin models with the Fenestron systems.
PS: The helicopter in 'Blue Thunder' that you talked about isn't really quiet in real life, as it is based upon a conventional helo with some cosmetic additions.
2007-01-16 01:13:11 · answer #2 · answered by Wildhoney 3 · 0⤊ 0⤋
Helicopter Silent Mode
2016-12-17 03:11:30 · answer #3 · answered by ? 4 · 0⤊ 0⤋
A really quiet helicopter is impossible, but some are designed to make less noise.
For example the helicopters with "fenestron" tail turbine ( Like Aerospatiale Dauphin and Gazelle used by USCG, EC-120, EC-130, EC135... ) are silenter, and also helicopter equiped with NOTAR ( NO-TAil- Rotor like some of NH-500 series) are quiter than helicopters with tail rotor.
Some tail rotor are also designed to be quiter....for example the 4 blades of the tail rotor of the AH-64 "Apache" are not perpendicular in order to be quiter.
2007-01-16 02:21:21 · answer #4 · answered by sparviero 6 · 0⤊ 1⤋
Of all air craft helo's make lots of wind turblence not much you can do to quiet them down. Tail rotor less Helo's are less noisy and at 3,500 feet or higher you might not hear them in a urban setting. Do not beleave "airwolf" it's just a show!
2007-01-15 23:54:43 · answer #5 · answered by John Paul 7 · 0⤊ 0⤋
the government has secret black helos that you can't hear or see...they watch us a all times.
2007-01-16 00:19:23 · answer #6 · answered by Anonymous · 0⤊ 2⤋