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HelicopterMain Discussion › Whats the difference between....
10-24-2004 08:13 PM  13 years agoPost 1
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rrNovice

South Wales

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Hi guys,

Could someone please explain the differance between a HH gyro and a non HH gyro please.

And also, what exactly does a HH gyro do and would a HH gyro help me learn to fly?

THanks

.A.

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10-24-2004 08:32 PM  13 years agoPost 2
w.pasman

rrElite Veteran

Netherlands

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A regular gyro just gives a 'kick back' when it measures a an orientation change that was not asked for (eg by wind). You can only adjust the scale factor between the measured orientation change and the kick back.
A heading hold gyro measures the heli's change in angular rotation speed, and tries to calculate the heli's orientation from that. It then tries -by steering the tail of course- to come as close as possible to the orientation asked by the pilot.

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10-24-2004 08:50 PM  13 years agoPost 3
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rrNovice

South Wales

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Hi guys,
Thanks for the info!

So let me get this right.....

Say my heli was pointing northwards and a gust of wind blew it 90 degrees so that it was pointing eastwards, a HH gyro would then correct the trun introduced by th ewind and return the heli to a northwards facing direction?

If this is the case, does it take very long for the HH gyro to react and reposition the nose of the heli?

Sorry for the questions but as you have probably guest I am a newbie!!

.A.

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10-24-2004 08:54 PM  13 years agoPost 4
Colibri

rrKey Veteran

The Netherlands

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and would a HH gyro help me learn to fly
It helps if you are learning to hover because you hardly have to give tail inputs which makes it easier to focus on the other controls. A slight disadvantage is of course that you don't learn to control the tail but you can always disable HH once you feel comfortable with the other controls and focus on the tail.

It is going to be weird for a while if you learn how to do turns without HH and switch it on later. The weathervaining effect of the helicopter makes it easier to do a turn because the tail will follow the course of the heli. If you switch on HH and then do a turn you'll notice that you have to input significantly more rudder to get it to turn around. HH keeps the tail where it is and doesn't let weathervaining change it.

I'd say it depends on where you are in the learning curve whether or not it will help you but in the end you will always want to be able to fly with and without HH.

If you asked the question because you are about to invest in a gyro always go for a gyro with HH that can be switched off (remotely). That way you can always do both and use what you prefer for what you are learning. If you go cheap now you will most likely be buying a new gyro soon.

Tim

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10-24-2004 08:54 PM  13 years agoPost 5
z11355

rrMaster

New England

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the HH gyro reacts very very quickly so that
it wouldn't let the machine experience that
90 degree 'turn'.

It's like the HH gyro has memory so that it
keeps the nose pointing in a certain direction
whereas the normal gyro will simply try to
bring to zero the turn but not 'remember'
where it came from

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10-24-2004 09:00 PM  13 years agoPost 6
DOKEY

rrProfessor

Northamptonshire UK

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Say my heli was pointing northwards and a gust of wind blew it 90 degrees so that it was pointing eastwards, a HH gyro would then correct the trun introduced by th ewind and return the heli to a northwards facing direction?
Its not quite as good as that, there is a window in which the gyro will help, if it gets pushed to much and goes out of this window the tail will let go (give up)

If you are able to, have a look at trying to get Russ Deakins book, excellent info in there, will worth buying.

Ryan.

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10-25-2004 07:57 AM  13 years agoPost 7
w.pasman

rrElite Veteran

Netherlands

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active,

yes that's the idea.
Gyros and servos are VERY fast, in the order of 0.05 seconds for the servo and 0.02s for the electronic signal to the gyro. The wind gust would have to be extremely strong if the heli were to rotate that far. Usually the correction is made way earlier.

And dokey is right in the sense that most gyros would assume a kind of system failure if the error would become as large as 90 degrees. But that hardly ever happens with normal flying and proper setup.

You don't need to learn to fly in normal mode. HH gyros are there to stay. I never bothered about normal mode except to check the set up of the machine.

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