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4 Bladed Teeter Head

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Old 07-12-2008, 05:05 PM
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ottogiro58
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Default 4 Bladed Teeter Head

Hi Gang, Any thoughts or evidence of a four blade teeter head being used ?? Picture a gyro with a Bensen teeter head, as if the two blades were in line with the fuselage. But instead of two blades inline, four blades are installed like an "X" atop the fuselage (considering a special mount would have to be made). Teeter hinge line would bisect blade chord lines. Has anyone experimented with this design head ?? Any thoughts on its feasibility ?? More blade area, and might ? result in a smoother operating head. Thanx for your input. Charlie Anderson
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Old 07-21-2008, 10:42 AM
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Default RE: 4 Bladed Teeter Head

Somebody...........anybody ????? Your input would be appreciated. Thanx !!! Charlie Anderson
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Old 07-21-2008, 06:57 PM
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mnowell129
 
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Default RE: 4 Bladed Teeter Head

Someone already did this, but I can't find the link. Four bladed teetering is really hard to to
because the two blade systems have to interlock but not touch each other.
It doesn't really have any advantages as regular flapping hinges do the
same thing on a 3 or 4 blade head. Teetering really only makes sense on two blades.
Blade area is not that critical, I'm flying a 1 pound model with
two little 1.5" x 16" blades and can fly fast and slow....
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Old 08-04-2008, 08:59 AM
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Emilio Cabezas
 
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Default RE: 4 Bladed Teeter Head

Hi Charlie,

Just in case you didn´t know, 4-blade teetering heads have been used in full size practice. Igor Bensen did and, more recently (a few years ago), my friend Angel Serrano converted his full size gyroplane by fitting a second teetering rotor on top... He slightly reduced the rotor diameter of the standard rotors. Says he obtained 15 Km/h (9 MPH) higher cruising speed. With full sized aircraft, I guess it is easier to use two teetering rotors instead of building a complicated 4-blade articulated head which might need lead-lag dampers, etc...

Regards,
Emilio Cabezas
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Old 08-04-2008, 03:48 PM
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Default RE: 4 Bladed Teeter Head

Hi Emilio, Thanx for the pix of the 4-blade teeter-head gyros. Seemed like a reasonable idea...............glad someone has proven it out........ Charlie Anderson
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Old 08-10-2008, 10:01 PM
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Default RE: 4 Bladed Teeter Head

Charlie,

[link=http://www.autogyro.com/technic/pstah.htm]Check this out.[/link]
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Old 08-11-2008, 06:25 AM
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Default RE: 4 Bladed Teeter Head

Hi Mike, Thanx for posting the cool photos and link. Very clever design. Hope he has good success with his beautiful bird..............Charlie Anderson
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