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06-06-2009 08:52 PM  9 years agoPost 1
toolman18

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Portland Tx

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The gyro is a G 500 T. The heli is a Mini Titan. The tail constantly drifts for the first 1 minute of the flight. After that it doesnt drift anymore. When i go for another flight it drifts for the first minute again. What is going on?

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06-06-2009 08:53 PM  9 years agoPost 2
BarracudaHockey

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Jacksonville FL

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Adjust your rudder sub trim for no drift on the ground in heading hold mode, its easier to see if you turn the gain all the way up when you do it.

Andy
AMA 77227
http://www.jaxrc.com

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06-06-2009 10:48 PM  9 years agoPost 3
toolman18

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Portland Tx

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Thanks Barracuda. Ill give it a try.

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06-07-2009 09:10 AM  9 years agoPost 4
f penfold

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uk

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I would do what barra said but once i had got it right id then set it up mechanically then take off the trim.

I know I used lock tight why did my head explode

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06-07-2009 10:33 AM  9 years agoPost 5
nivlek

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Norfolk England

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I would do what barra said but once i had got it right id then set it up mechanically then take off the trim.
I agree that you should set the heli up mechanically , but you won't be able to remove the trim . You need to trim it in on the radio in HH , what you are doing is not really timming as such , it's setting the reqested rate of rotation to zero degrees per second.

Then switch to rate mode and adjust the length of the linkage until it's also mechanically trimmed for rate mode .

Switching back to HH , the trim will still be correct and you'll never need to go back into rate mode ever again .

At the end of the day , it gets dark .

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06-07-2009 08:34 PM  9 years agoPost 6
f penfold

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uk

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in the gyros ive used you set them up in normal mode ie tail at about 8` of pitch adjust the links til the tail holds in noraml mode then switch to hh mode no trim at all

I know I used lock tight why did my head explode

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06-07-2009 10:11 PM  9 years agoPost 7
nivlek

rrProfessor

Norfolk England

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in the gyros ive used you set them up in normal mode ie tail at about 8` of pitch adjust the links til the tail holds in noraml mode then switch to hh mode no trim at all
It sounds like you were not using CSM or JR gyros , more like Futaba .

At the end of the day , it gets dark .

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06-08-2009 12:15 AM  9 years agoPost 8
toolman18

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Portland Tx

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-2 on the sub trim worked perfect. Thanks Barracuda and all others who replied.

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06-08-2009 07:16 AM  9 years agoPost 9
f penfold

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uk

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yes thats right i have a couple 401 two 611 two soild g and two spartans

I know I used lock tight why did my head explode

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06-08-2009 04:04 PM  9 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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Until you read the manual for a JR gyro it's probably best not to contradict those of us that have used them

Also note that I said SUB TRIM not transmitter trim.

By way of explanation, Futaba gyros, while they are booting up, measure the pulse width of the rudder channel and make that center. On the 401 this is that 3 seconds of fast flash and why you can't move the gyro or move the stick during bootup.

JR gyros assume a center pulse and anything else is considered a rudder input hence drift. Since not all systems are calibrated, on JR gyros you have to match the rudder center with what the gyro expects. The way to match the center pulse with what the gyro expects is to tweak the subtrim until the drift is gone then the gyro will be happy.

Mechanical trimming is done after this.

Andy
AMA 77227
http://www.jaxrc.com

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06-08-2009 11:24 PM  9 years agoPost 11
toolman18

rrElite Veteran

Portland Tx

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Also note that I said SUB TRIM not transmitter trim.

By way of explanation, Futaba gyros, while they are booting up, measure the pulse width of the rudder channel and make that center. On the 401 this is that 3 seconds of fast flash and why you can't move the gyro or move the stick during bootup.

JR gyros assume a center pulse and anything else is considered a rudder input hence drift. Since not all systems are calibrated, on JR gyros you have to match the rudder center with what the gyro expects. The way to match the center pulse with what the gyro expects is to tweak the subtrim until the drift is gone then the gyro will be happy.

Mechanical trimming is done after this.
Its true. I tried setting this gyro up like a futaba and it didnt work. I set it up just like i set all my other futaba gyros and it still had drift. Until i added the sub trim it had drift. Now its beautiful and i like it better than my 401.

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