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UFO technology and sightings => New propulsion technologies => Topic started by: hartiberlin on October 16, 2007, 11:56:41 PM

Title: Offtopic: Helicopters don?t need tail rotors !
Post by: hartiberlin on October 16, 2007, 11:56:41 PM
Very interesting new invention:

http://www.youtube.com/watch?v=kvP_bZt65d0

Forward to about minte 4:00 to see it fly.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: Pirate88179 on October 26, 2007, 07:09:56 AM
Very interesting.  I don't understand what control changes the direction then?  I am familiar with NOTAR and also, my favorite, the co-axial twin rotors, but what allows the 180 degree change in direction with this design?

Bill
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: albert on October 27, 2007, 10:49:55 AM
I think this is ridiculous. A helicopter that cant hover....all those guys never learned to hover and yet they still want to fly a helicopter.so this is the lazy man's approach...
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: raburgeson on December 14, 2007, 07:09:52 PM
Apparently,

http://www.youtube.com/watch?v=2IghwseoISc

http://www.youtube.com/watch?v=rQOB9d09x6A

They don't need any rotors at all. (not a model)
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: Chad on December 15, 2007, 02:22:47 AM
Apparently,

http://www.youtube.com/watch?v=2IghwseoISc

http://www.youtube.com/watch?v=rQOB9d09x6A

They don't need any rotors at all. (not a model)

it does seem as though they arnt moving but the rotors are curved upwards indicating they are supporting weight, so maybe it is just the fps that are equal to the rpm of the rotors making them apear motionless.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: raburgeson on December 18, 2007, 06:18:47 AM
Being able to sinc the rotors in the same position relative to the craft would be impossible. The craft was shown changing altitude both directions. When you give it the gas to go up the speed of the rotor changes drastically. That rotor can't be turning, radar and a computer to plot frame rate couldn't even do it.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: albert on December 18, 2007, 12:13:18 PM
it has to be a strobe effect. rotor speed does not change when moving up or down, its the pitch of the blades that changes. With modern turbine governor systems the rotor speed will be so constant that one could shoot this with a video camera that allows manipulation of shutter speed/scanning time. you look thru the finder and set the dial so the rotor seems to stop. I dont think there is another explanation for this.
The only other thing I could think of is thrust systems like the harrier jet. but this would be visible.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: blagoja on June 01, 2008, 11:05:21 PM
Dear Sir, have created the new mechanical technique this new mechanical technique large ships can will crowd twice the larger speed instead of the propeller-driven system with the same operating engine. Using the strong piston plane engine this mechanism can easily will crowd smaller planes with the larger speed from the speed of sound and on the last exit from the plane jets from the alone clean air.Have made the prototype and look at pictures and film from the prototype. Effect with waters from the picture 2 has been got with el. m. from 1.1kw. the such waterspout with this operating energy from 1.1 kw. the neither other pump not was able will appear. Necessary we are help sponsor-partner that prove this what has written in the letter.
Please contact that you explain in some detail across the letter that you explain why needs that makes larger prtototip from this mechanical invention for in navigable or the flying object, in order to has understood why us necessary your help. Look at and film from the prototype and intensify the sound.
Best regards from Blagoje Dzikovski.
Dzikovski Blagoja.01.06.2008.Skopje.E-mail: blagoja46@yahoo.com  Republika Makedonja
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: retroworm on June 02, 2008, 07:22:51 PM
If you have to sacrifice hovering, I think it's more practical to take that final step and turn it into a gyroplane. Added benefits would be higher flight speed, better manouverability, better fuel efficiency and overall lighter design.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: utilitarian on June 02, 2008, 09:37:01 PM
Very interesting.  I don't understand what control changes the direction then?  I am familiar with NOTAR and also, my favorite, the co-axial twin rotors, but what allows the 180 degree change in direction with this design?

Bill

I think the flat tail serves as a rudder.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: buzz-ard on June 05, 2008, 12:24:03 AM
@ util - You are exactly correct - it's a rudder. A rotating tail rotor provides power-rudder control at all speeds and prevents spin. The stationary rudder doesn't exert force of its own, thus continuous forward motion of the craft is required in order to maintain control. In a hover it would spin out.

@All - I never believed it until I learned to fly, but helicopters are generally preferable to airplanes if you lose an engine. The rotor blades act as airfoils and can allow enough control through pitch adjustments to waft the craft down. Conversely, the airplane becomes a very heavy glider that loses altitude quickly while picking up speed. Overall, the landing in a disabled heli is often softer than in a plane.
Title: Re: Offtopic: Helicopters don?t need tail rotors !
Post by: Bulbz on June 05, 2008, 01:24:15 AM
Being a model aircraft enthusiast myself, I have seen plenty of helicopters without tail rotors. They usually have two main rotors, one rotates clockwise, the other rotates counter-clockwise, by means of two motors and a coaxial shaft.