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HelicopterMain Discussion › how can i explain to someone what the difference is
06-03-2004 03:49 AM  13 years agoPost 1
foo

rrVeteran

Richfield, Minnesota

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between heading hold and regular gyro ...... i try to explain it but i cant really

Raptor 30 v2 / OS .32 / JR 8103 / GY-401+9253 | Raptor 50 V2 / OS .50 Hyper

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06-03-2004 03:56 AM  13 years agoPost 2
the collective

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Bayside, NY, U.S.A

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foo,

The easiest explanation I can come up with is that all a standard gyro does is detect rotation and try to fight against it. Whether the rotation is caused by an external force like a wind gust, or by the pilot moving the stick, the standard gyro tries to stop the rotation. It's a dumb device, it only does that one thing, try to stop any rotation.

A heading hold gyro is a smart device. It looks at the stick position, and if the stick is centered it doesn't allow any rotation. IF some external force like a wind gust starts to rotate the helicopter, the heading hold gyro not only stops the rotation, it returns the heli to where it was before the force acted on it. BUT, the big difference in a heading hold gyro is that if it sees the stick move away from the center, it translates that into a yaw rate and then tries to maintain that exact yaw rate until the stick is moved again. While the regular gyro ALWAYS fights against rotation, the heading hold gyro knows when you WANT rotation and gives you an exact rate of rotation based on stick position.

Hope that helps.

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06-03-2004 04:33 AM  13 years agoPost 3
TMoore

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Cookeville, TN

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Just to add to what "the collective" has said, have you ever noticed that the HH gyro tends to move the servo one way or the other and hold even when your heli is sitting still? A rate gyro will just sit there with the servo centered waiting for a yawing motion and if it doesn't happen the Yaw rate gyro is happy to just sit there waiting. The HH gyro doesn't work like that because it will actually try to induce a rotation on its own in an effort to measure the yaw rate and then compensate for it. IOW's the HH gyro looks ahead while the yaw rate gyro is always behind the rotation.

This is the reason why a HH gyro with a fast servo will make the tail feel locked in but when you move the stick the tail will snap to any position you want and then lock the tail in again. The HH gyro is constantly trying to measure rotation and correct and the yaw rate gyro waits around for rotation to happen and then correct. It's easier to pull a chain than to try and push it.

Terry

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06-03-2004 04:39 AM  13 years agoPost 4
foo

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Richfield, Minnesota

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Thanks guys !!!!

Raptor 30 v2 / OS .32 / JR 8103 / GY-401+9253 | Raptor 50 V2 / OS .50 Hyper

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HelicopterMain Discussion › how can i explain to someone what the difference is
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