Its a Corona 120 electric-
gyro= gy401
tx = futaba t6xh


problem is- my tail is out of control- and when i try to correct it via the tx, it flies in the new direction... There is no middle point, tail swings fast in one direction or the other.. I tired unplugging the gyro and the same thing is happeneing.. Anyone know where i can start to trouble shoot this?? i have checked to make sure the set skrews were tight on the gear- and used lock tite.... any help is GREATLY appreciated!!!

thanks in advance!

I assume that the heli did fly well before this. With that in mind all I can think of is that the gyro gave up ,it has happend before so it's not unheard of. Do you know anyone with a gyro you can try ? My buddy has been going thrue this same thing but he has extra gyro's to play with and his 1 gyro did give up. But his would work once in a while this gave him greaf till he swapped them out. Just a thought. If you turn on your radio and while holding your heli turn it back and fourth, can you hear the tail rotor servo move ??? If it does not than the gyro is not sensitive enough or it is shot.. Hope this helps some... Alan

Actually i never got this heli to fly since i put it together-- i just dont see whats wrong.. and with the gyro unplugged- its still way out of control... Any other ideas ??? All equipment is brand new!!

Thanks!

And i can hear the gyro attempting to correct- looks like it works.. L( and iv tried reversing it and no difference in tail reaction

Is the gyro new /??? if so you can change the gain "make it more sensitive", If you got the gyro new there should be directions on how to do this.. It sounds more like whats wrong .. Alan

iv played with the "delay" every wich way from 0 to 100 % and it might get a little better but every wich way its too out of control- it whips in one direction.,. and if i correct with TX the other way- it'll whip the other way... Anyone familiar with the mounting of the futaba gy401?? i have it mounted on the left side (from the back) up front with gyro on top- the mounting position is like i guess if it was mounted on a wall ... is there also anything else aside from my gyro that can be the cause???

Thanks!!!

The gyro is what keeps the tail straight, even if the tail rotor was way out of adjustment you should be able to hold the tail straight with input from the tx. Being that this swings from side to side with input sounds like a gyro problem. The gyro has to be mounted level and certain side up. I do not have your style gyro so this is all I can help you with good luck... Alan

i noticed the the gear on the wire isnt holding tightly enough- i can hold the gear and im able to move the tail blade.. could this be a contributor? im going tommorow to pick up a file so i can file a flat notch in the wire to help keep from slipping.... could this be the whole problem?

YES this could very well be the reason for the swing. The carona tail rotor is large and it needs to be the right rpm. There are 2 set screws the hold that gear on are they both tight?? On my nitro LMH this did happen to me once where the 1 set screw was stripped in the allen side and it wouldn't tighten all the way this did cause a non control problem... Is this corona new ??? Did you build it ??? Second hand stuff can be a bit on the tricky side as was my nitro LMH. I had to go all over it and correct a lot of stuff before it even fly... Hope this all helps.. Alan

yeah its new.. i built it a while ago- but have been busy with other heli's since and now finnaly getting back to this one... the set skrews dont seem to hold so ill file the notch.. wish me luck!! i also played with a few setting on the TX - (so many settings!!!) you would think that by putting the tx in heli mode that it would be close to setup right for a heli- but seems like alot of tweaking is required... Im going to just check every end untill tommorow when i can put the tail together after filing... ill keep the board posted... Thanks a bunch for your help man!

ALSO- i cant seem to find pictures of any helis with the futaba gy401 gyro mounted on it.. i have it mounted "wall like" , i wonder if it should be mounted "floor like" .. Anyone know where i could find a pic? or know from experience?

Thanks!

and if it is "floor style" where would be the best place to mount it -and anyone know where i can see a pic of it in action on a corona?? seems like the wood frame is designed for everything to "wall mount" .....

Thanks in advance for any help!! also i appologize for making up my own terminology (wall type, floor type)

Hi scimitar, you've got the gyro mounted the wrong way. I just re-read the instructions to my 401 and it clearly states that it must be mounted "floor-like." You must read the instructions for these things - especially as you need to do some switch-flicking to get it set-up correctly too

Where to mount it - I'd make a small platform on the boom close to the crutch. But that's looking at it from my IC version's set-up, I don't know about the Corona at all. Here's a pic of a similar installation: http://www.mh.ttu.ee/risto/rc/logo20...images/011.jpg (took a couple of attempts to get the correct address here!)

Good luck

Tony

k- there was some slippage on the tail wire- so i got that straightened out.. and the gyro was mounted the wrong way- and now iv got that straightened out.. and just when i was siked to see this thing lift off semi straight--- same S&*T ... still the tail is out of hand... anyone got any ideas on the next troubleshooting step?

I just had a frustrating afternoon trying to fix exactly the same kind of problem on my Piccolo. I tried everything I could think of. In the end I discovered it was just the negative and positive cables to the tail motor that needed reversing (goodness knows how I got them the wrong way round in the first place - I've been flying the thing for years!)

Although it now seems obvious, it didn't look that way right up to the point where I switched the cables around. I was sure I had a serious problem and at one time had decided that the gyro had packed-in

Hope you find the cause of your problems

Tony

I wish i had a tail motor to do that- being that with the problem i have now- the prop turning the wrong way seems pheseable.. but with the corona- the tail is drvin right off the main shaft- and all gyro/servo cables look straight to me... i dont think its possible for the prop to go the wrong way on a corona..... Anyone got any other ideas?? im about to declare this a failure and just bring it into a hobby shop and tell them to get it straight-- wich is always a humbling defeat ... any other ideas would be much appreciated!!

thanks for you help all!!

Simple fix, first off the gyro has to mount as you call it on the floor. Make a shelf out of the scrap wood from the kit shaped like a fork but with the tines facing towards the swash plate. Mount the gyro on the plate facing up. Connect it to your channel 4, rudder channel and connect your servo to the plug on the gyro. Turn on transmitter and be sure the throttle is all the way off. Plug in your battery pack on the Heli. Work your controls on the rudder channel, left rudder should move the servo arm towards the tail. Now, pickup the Heli and swing the tail to the left. Watch the servo arm, it should move to the left as well and, towards the tail. If it moves right, or towards the swash plate you need to reverse the gyro. If it moves to the right from the start, reverse your servo direction. Once you do this, the gyro should be set at 75% and you should be able to lift off without the tail spinning. If it spins and won't stop either you have a bad gyro, or you have something backwards. Reread what I just typed and start over. This will work!!

NOTE: The Corona rotors turn in a counter clockwise rotation, looking down on the top of the rotor blades they should be turning counter clockwise. If you have that right the tail will automatically be correct!

Gary

Here's a photo that might help with gyro oreintataion , also is the TR drive gear on the main shaft top or bottom for correct rotation ?

Steve .

This may sound silly, but I had lots of trouble getting my hummingbirds tail to stay put until I realized that my transmitter's rudder channel needed reversing. After that quick "fix", I was in good shape!!

Jason

k- i figured it out!!!!!! i found more slippage in the tail... the gear wasnt holding the shaft for whatever reason- so i changed set skrews and now holds fine... i mounted the gyro "floor wise" and i think the biggest problme was this bug i noticed--- if i turn the heli on when the ch5 switch on my tx is in the upward position- the gyro flashes and i think it might be in some sort of errord mode-- but when i start with switch the other way- the gyro responds with the correct light patterns... dont even want ot open that can of worms- but at least i know how to get that straight... the heli now is finnaly tolerable- now i just have to fine tune it a bit... tail seemed a bit twitchy though- what could this be?? just tried to mount the gyro on the motor platform just for now to see if the positioning would help-- so i guess ill make that frame extension.. Thanks alot guys for you help!!!!! any ideas on how to get the tail less twitchy? would that be shorter delay on gyro? or is it due to where i mounted it..??

Thanks again!

i also have a hummingbird as well- and am not used to having a tail without a motor-- its drivin right off the main shaft- and i couldnt understand how my tail could be so out of whack..... any help with the twitchiness would be great! can this only be the gyro?

If your definition of twitchy is that the tail is wagging like a dog's tail just back off of the gyro gain a smidge until it just stops wagging .

Steve .

nah- its pretty steady- but seems like the gyro is correcting in a very twitchy way- hard and fast- small adjustments... the tail is actually pretty straight...

Mando-

how do you hold your battery with that LG -- i have the same but i keep busting the battery holding part- trying to squeeze the battery in there.. Cant see too clearly o n how you have it.. Can you offer some help on this?/

Turn down the gryo gain. That is why you have the twitch.

so i have a gy401 futaba gyro-- i should decrease the delay or increase delay?