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06-06-2004 04:13 AM  13 years agoPost 1
SceaduRob

rrNovice

Sacramento, CA

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My Shogun 400 has a very severe tail wag/hunting problem that I have been unable to remedy. The 'copter flies with the stock 400 motor, a 2100 mAH LiPo (for balance), 4x MPI MX-50HP servos (.08ms/23oz), GY-401, and a Berg-6 Rx.

I have moved my tail servo and gyro to the rear boom with a carbon mount from MJP Carbon in an attempt to solve this problem. This made a difference but not the large one I was hoping for. I can currently run my Gyro at ~25-30% in AVCS mode and it still hunts, though not as severely.

The Gyro is in normal servo mode (Non-Digital servo)

I would greatly appreciate any ideas on what may be causing this. I still run the stock T/R Pitch slider wire in its sleeve but have it running in a straight line from TR to Servo with no slop.

Thanks in advance,
-Rob

-Edit- Specified normal mode referring to servo type

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06-06-2004 04:18 AM  13 years agoPost 2
cnsheets

rrApprentice

Anaheim, Ca

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Put the tail wire in the middle hole of the servo arm. You may have it too far out. Make sure you have the limit set on the 401 for max throw without binding, then set the 401 to heading hold. No reason to use normal mode.

They should outlaw normal mode gyro's!!!

---Freya Evo TJ Pro/Rev Max(rep) Magnum(rep)

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06-06-2004 09:48 AM  13 years agoPost 3
SceaduRob

rrNovice

Sacramento, CA

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Tested the 'copter with the TR control rod's Z-bend in the middle and inner-most holes. I did not notice any difference in the amount of wag. While I was changing the rod position I checked the amount of movement/play and everything feels fine. The linkage moves smoothly and easily.

-Rob

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06-06-2004 10:07 AM  13 years agoPost 4
Twin_squirrel

rrApprentice

Wiltshire, UK

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Alway use Normal or rate mode for setting up the mechanical trim on the tail i.e. no drift at hovering throttle adjusted on the linkage, and then switch into HH. Otherwise you will never get the gyro to work at its optimum

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06-06-2004 12:46 PM  13 years agoPost 5
Tom Viper

rrApprentice

SWEDEN

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I agree with Twin Squirrel, you NEED to set up all HH gyros, you shoult NOT use any trim to get it right, otherwise, it will not hold when inverted!

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06-06-2004 03:05 PM  13 years agoPost 6
dragonfly

rrVeteran

Granbury, TX. USA

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You might want to increase your throttle curve. When I first set my zoom up I was running it with too slow of a head speed and had the waggs. After I increased my head speed the tail became rock solid.
Mark

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06-09-2004 12:45 AM  13 years agoPost 7
fran

rrVeteran

HONEA PATH, SOUTH CAROLINA

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If you're using a Futaba TX

Turn off/inhibit ALL TAIL ROTOR MIXES that are preset in a Fubata Tx.

I don't know all that much about gyro (tought myself how to fly RC heli in 1979 and used the JMW with stick priority and being a not soooo bad FAI-F3C pilot....I would strongly urge all of you to do the mechanical set-up (normal mode) and do it right so you don't have to fool yourselves by turning on the HH and using trim as an off set!
If you do that....you'll never see another "weather-vane" again!!

Remember on very important thing ACVS does what it is told...Garbage in...etc!

Fran

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