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Radio - Futaba FASST > help with set up on gy 401
 
 
yelly
Heliman
Location: Liverpool merseyside england

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ive just upgraded to the gy 401 9254 0n my raptor 30, i'm using a 2.4ghz futaba t6ex radio. I've fitted the servo and gyro and got it working on the bench, all appears correct for direction and switching between hh and rate modes, i,m getting a solid led in hh and it goes off when switching to normal.

my problem is when trying to set the gain in my radio ive followed the manual and switched off the gyro inhibit then as a starting point ive put +50% gain in hh and +50% gain in normal, but then when i initialize the gyro again i cant switch it out of hh mode, regardless of the switch position the led stays solid and the servo is working in hh mode, if i go back in and inhibit the gyro i can then switch between modes, what am i doing wrong? thanks,colin
11-01-2009 11:47 AM
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Peefor
Veteran
Location: St Albans UK

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Colin
I'm not familiar with that radio, but as a start, play with the numbers. Move them away from 50%. 50% always used to be the OFF postion. The newer radios centre is 0 with -100 to + 100.

Pete
11-01-2009 12:17 PM
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Thomas L Erb
Veteran
Location: Alliance ohio

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yelly you have both values set at "+" . HH is a + value and nor is a - value. check out the manual on pg 27 http://manuals.hobbico.com/fut/6ex-2_4ghz-manual.pdf

also dont forget to set you piro rate using the atv for channel 4. good starting point is 80,80

Tom
11-01-2009 01:30 PM
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yelly
Heliman
Location: Liverpool merseyside england

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401 set up

thanks for the advice, its appreciated, i will try changing the norm setting to a minus value, now that i think about it i do remember reading about setting minus but that didnt seem correct when setting gain. on the piro rate you mention atv, sorry to be dim what does that mean? should i reduce the end point settings for channel 4 they are at 100% at the moment, and i presume the less the throw the slower the piro rate, once again thanks,colin ps ive never had a hh gyro , do you guys always fly in heading hold?
11-01-2009 09:00 PM
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Thomas L Erb
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Location: Alliance ohio

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the + &- in this case only designates the position of the switch and hh vrs normal. Atv is adjustable travel volume but sorry for the confusion but in your case it is EPA end point adjustment and yes i would start at 80-80. this will set the max piro rate of the tail.

Tom
11-01-2009 10:57 PM
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yelly
Heliman
Location: Liverpool merseyside england

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401 set up

thanks for your advice tom , you were correct, i have set a minus gain in norm and now the gyro is working correctly on the bench sorry to keep asking questions, the gyro has a limit pot on it which at the moment is at 100% is this a bit like the epa adjustment in that it controlls the maximum throw on the tail, which i presume will affect the piro rate it can be set as high as 140%
also i've never flown with a fast tail servo ,will i be better off putting some expo in to soften the response thanks,colin
11-02-2009 08:11 PM
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Thomas L Erb
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Location: Alliance ohio

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The limit pot on the gyro is to set you max mechanical travel. It is very important that you adjust this correctly. it adjust both sides at the same time so you have to check both travel directions when you adjust this pot. you want to get max travel with out it hitting a stopping point. the EPA in your radio for channel 4 (RUD) will only and is to adjust the piro rate.
also make sure you have the servo select dip switch in the proper place for the servo you are using. this switch lets the gyro know if you are using a analog or digital servo. it is very important that this is correct. The other dip switch is for gyro direction selection.

more info to come

Tom
11-03-2009 12:25 AM
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Thomas L Erb
Veteran
Location: Alliance ohio

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Next on the list of info is you will need to mechanically adjust your tail for center. this gyro does not tolerate any trim in the radio. you need to be sure to keep your rudder trim on your tx always centered. you will always powerup the rx with your switch in HH mode never in normal. if you do power up in normal the light will blink so always look for the solid light and never move the heli at all until the gyro is booted. This usually takes about 3-5 seconds at the most. you will then start the heli up and when you are on the field ready to liftoff turn the gyro to normal mode and liftoff to see if the tail needs any trim to stay steady. if it needs adjusted only do this mechanically. when you have the tail trimed correctly them just flip the switch back to HH and off you go!After this you will only have to adjust your gains to your liking. hope this helps and dont be afraid to ask questions. Tom
11-03-2009 01:46 AM
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T-Rex-Flyer
Key Veteran
Location: Panama City, Fl

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You can also take a look here under Gyro and Flybarless Systems for a video.

If the wings are traveling faster than the fuselage, it's probably a helicopter.
11-03-2009 04:28 PM
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yelly
Heliman
Location: Liverpool merseyside england

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wow,all this info is great, i feel much more confident in setting up now and i will ensure i get it mechanically correct so my gyro remembers the correct centre neutral. because my radio is pretty basic and i have set the gain for hh and norm which i will fine tune once i get out flying, my other question is do you need to alter your gain for other flight modes eg, idle up etc, then re-adjust when going back to normal flight mode? once again thanks to everyone for the advice you have given, and special thanks to tom
11-03-2009 08:22 PM
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mylee
Senior Heliman
Location: Rochester, UK

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Nice advice Tom, well explained.
11-03-2009 08:56 PM
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Thomas L Erb
Veteran
Location: Alliance ohio

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Yelly you will probably be able to get away with one setting for your hh gain depending on your flying style. most will have higher gain in hover and lower for forward flight but unless you are doing some hard 3d or very fast backward flight you probably not have a need to change your gain for any of your flight conditions. If you see that you need to have a different gain for your idle ups than you can use the gyro screen to have 2 hh settings that you can switch between as needed (exactly as you had at the start of this thread) . It will be fine to do this as unless you plan on flying in normal mode. you will only need normal mode access to check the mechanical tail trim and then can switch it back to what you want it to do to suit your flying style. I would run as high of a gain as you can in fast forward flight until you start getting a wag. then back it off until no wag is evident. Then all you need to do is decide if this is enough for hovering . Hope this helps.

Tom

ps some advice, when setting highest gain point during FFF if you start to see a wag make an immediate turn in any direction. This will stop the wag immediately and stop any chance of causing any damage from a really nasty wag
11-04-2009 04:01 AM
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BarracudaHockey
rrMaster
Location: Orange Park FL

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head over to http://www.raptortechnique.com and read his section on tail and gyro setup, you'll have a much better understanding of whats going on.


AMA 77227
http://www.jaxrc.com
11-04-2009 02:43 PM
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yelly
Heliman
Location: Liverpool merseyside england

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once again some great info, thanks to everyone who has helped me to get my gyro set up correctly and thanks to tom for your time and experience it is appreciated colin
11-04-2009 07:52 PM
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Radio - Futaba FASST > help with set up on gy 401
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