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HelicopterBeginners Corner › Set Up question for beginner
03-10-2003 07:33 PM  14 years agoPost 1
garshom

rrNovice

Hollywood FLorida​33021

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I took my HawK Sport to fly this past sunday after having replaced the rotor and tail boom. I had it trimmed out before where it would hover for a short time, in place with almost no input from the control sticks with the help of an experienced heli pilot. Now I am trying to set it up where it will do this again without feeling as though I am fighting the control stick. One thing I notice is that as speed increases the tail rotor has a tendency to want to start turning on me ( not violently) but enough to where I notice it and keep having to correct . Is this a trim adjustment or a gyro gain issue? Also I have a JR 662 as my radio and when you set up the heli so it hovers reasonably well do you just use the trim adjustments or do you open the sub trim adjustments to do the setting up while its flying?

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03-10-2003 09:33 PM  14 years agoPost 2
mrNoodles

rrProfessor

Borlänge, Sweden

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I would suggest you to land when doing trim adjustments, at least when doing them in sub trim menu.
I just make small changes with the trim, and corrects bigger issues mechanical.

How is your gain settings? What kind of gyro?

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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03-11-2003 02:50 AM  14 years agoPost 3
PeterLNH999

rrApprentice

Clovis, CA - USA

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If it is a piezo gyro, it is normal for the rudder to want to move a bit and you have to correct it all the time. Get a Heading-Hold gyro and the tail will stay rock steady.

Pete

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03-11-2003 05:24 PM  14 years agoPost 4
oldfart

rrProfessor

Vancouver, Canada

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drift and trim

As you have experienced, the Hawk is a very stable heli that can hover hands-off. It is always a good practice (with any heli after a repair) to set it up as good as possible, just as you are attempting to do....good show.

You can use both TX trim or Subtrim. Using Subtrim is better because then your trim lever can always be checked before every flight to insure they are in the middle. Then you will be sure the trim is the same for every flight. But that being said. Don't forget the primary trim adjustments - the CONTROL RODS. If you get used to always using them as the primary trim and the TX trim functions to "tweak the difference" you will find all will work more symmetrically. I will always trim mechanically until the TX trims require less then 10 trim units.

Tail Drift - Over the 15 plus years I have flown helicopters, I have owned and operated a number of Yaw Rate "piezo" gyros (JR, Futaba, GWS, Century, Arcamax), and I have always been able to trim all of them, even the cheapies, to fly hands off without drift. If you have your throttle/pitch curves set for a relatively constant speed, your tail rotor mechanical control system set for smooth and bind free operation, the revo mixing set properly and your gain set high enough they will all be cabable of this. Ditto for the HH systems.

The key to your statement, is "as speed increases". (I am asuming you mean rotor speed/tail rotor speed). As these speeds change the amount of torque compensation needed changes, so different trims will be required, if you leave all else the same. This is why it is so important with a yaw rate gyro to insure that you have a properly set up throttle / pitch curve, one that keeps the rotor speed fairly constant. On a well tuned system, even the relatively inexpensive gyros can hold through moderate speed changes, as long as the gain is high enough, without the tail wagging.

You might find the article on gyros in the hints and tips section of http://www.leisuretech.ca of assistance in understanding gyros (YR or HH) and their set-up.

Phil

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03-11-2003 10:21 PM  14 years agoPost 5
Raymond

rrApprentice

Northern Ireland

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If it is a piezo gyro, it is normal for the rudder to want to move a bit and you have to correct it all the time. Get a Heading-Hold gyro and the tail will stay rock steady.
You mean HH gyros are not Piezo


Seriously, another thing you need to look at is the revo mix (assuming its not a HH) which in simple terms alters the trim of the rudder depending on the throttle setting. Its been explained a hundred times before so try a search

If it is a HH gyro then make sure revo mixing is OFF

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03-13-2003 04:42 AM  14 years agoPost 6
PeterLNH999

rrApprentice

Clovis, CA - USA

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o oops i forgot a heading hold was a PIEZO hehe

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03-13-2003 04:06 PM  14 years agoPost 7
CollectiveSoul

rrNovice

Edmonton, Canada

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Since we're splitting hairs... If I'm not mistaken, the Futaba GY gyros are all SMM (silicon micro-machines), not piezo.

Jack

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