gyro behavior

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I have never touched a gyro in my life but I have been reading about them and am considering getting one to play with - will think about application later.  All my RC experience to now has been with fixed wing aircraft.

I have been searching and reading for hours and have not found the answer to this question.  Assume that a gyro is connected to the rudder and is holding a heading of say north.  What action releases the north heading and sets the gyro to hold a different heading?  I guess this calls for two answers - one for a HH gyro and another for a rate gyro.

If someone can clear this up for me I will sleep much better tonight.

Thanks for your help
Rod

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rodstree Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (US) USERID: 341086 Newbie Joined: 12/Nov/2009 Online Status: Offline Posts: 11	Quote Reply Topic: gyro behavior Posted: 14/Oct/2010 at 8:35am
	I have never touched a gyro in my life but I have been reading about them and am considering getting one to play with - will think about application later. All my RC experience to now has been with fixed wing aircraft. I have been searching and reading for hours and have not found the answer to this question. Assume that a gyro is connected to the rudder and is holding a heading of say north. What action releases the north heading and sets the gyro to hold a different heading? I guess this calls for two answers - one for a HH gyro and another for a rate gyro. If someone can clear this up for me I will sleep much better tonight. Thanks for your help Rod

Blind Vision Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (DK) USERID: 52464 Forum Admin ADMIN Joined: 21/Oct/2009 Location: DK/Denmark, AMC Online Status: Offline Posts: 3804	Quote Reply Posted: 14/Oct/2010 at 2:45pm
	Heading hold Gyro. Will hold direction/Level as long as it gets no input (depending on how you place it X/Y/Z axis). on a helicopter it counter acts the torque force from the main rotor, and keeps the tail from spinning (put very simple). the GYRO is connected to a Control surface (heli: the blade angle), for you own idea, Rudder, and the gyro will use that control surface to keep its set heading, and will only move to a new heading when you give it stick input. For a plane i would use it for LEVEL-wings, not the rudder. -Troels Edited by Blind Vision - 14/Oct/2010 at 2:46pm
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worldedit Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum (DE) USERID: 88026 Newbie Joined: 05/Mar/2009 Online Status: Offline Posts: 15	Quote Reply Posted: 10/Nov/2010 at 4:09am
	For standart mode your stick input tells the gyro the desired rate of rotation around the controlled axis. Lets say you dont give any input, so the gyro tries to keep the plane from rotating. If it gets rotated anyway, for example by wind, the gyro will try to stop that movement. If the rotation stops, the gyro stops acting, no matter what direction the plane faces. That means your plane will drift more or less, depending on how well adjusted and fast your gyro and servo are. In heading hold mode in the other hand, the gyro tries to keep the plane in the same heading. If it gets knockt sideways by wind the gyro will steer back until it faces in the right direction. This means your plane will fly more stable but might spin out of control if the gyro isnt set up properly. Normaly heading hold gyros can be set to standart mode or even shut down completely over a seperate channel. This is handy for setting it up and to keep it from acting before takeoff. Edited by worldedit - 10/Nov/2010 at 4:14am