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Home✈️Aircraft🚁Helicoptere-Electric General Discussion › KDS 450 fbl w/futaba 8j and nazza h help
05-12-2013 12:38 PM  6 years ago
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Fly1-1

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Neumarkt, Bayern, Germany

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KDS 450 fbl w/futaba 8j and nazza h help
Hello,

I put together a futaba 8j with a naza h on a KDS 450 fbl. Im having problems getting the gyro dialed in. In normal mode (rate) no matter what gain I put the tail spins CCW, I don't even attempt to get it off the ground. In AVC (HH)I have the rudder set to 39%, AIL 75% and ELE 75% and can get the heli of the ground, it holds pretty good but when I move the tail right and then left the tail will jump back to when I moved it right. Now Im not sure what the difference is on this futaba 8j in the gyro menu, it gives me RUD, RUD/AIL, RUD/EVE, and RUD/AIL/ELE. Now for the type I have two choices STD and GY. I have both rate and HH set on GY. In the dual rate and expo I have D/R set at 125% and expo +30% and all sub trims are 0. I am very new to this hobby and have no clue to these gyro settings or the settings in the naza h. I took some photos of the settings I have in the naza wizard maybe it will show what Im doing wrong. Not the greatest pics but hope it gets the point across.

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05-14-2013 03:01 AM  6 years ago
Joel Rosenzweig

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Marlborough, MA - USA

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Hi Erik,

The tail will spin in normal rate mode if you don't have the tail pitch set to compensate for the main rotor torque, perfectly. This means you'd need to adjust the push rod length until you get more CW rotation. Once you have this balanced, then the heli won't spin in rate mode. No matter how much gain you have, it will spin if the mechanical setup is off here.

If you don't need rate mode to work, then you can just setup the tail so that the pushrod puts the bell crank at the mechanical center of motion of the tail assembly. In heading hold mode, the gyro will do whatever it needs to do to maintain the tail position. You just need to make sure you setup NAZA so it knows your mechanical limits, using the A and B trim settings on the tail.

I can't advise you on the Futaba gyro settings.. those are foreign to me since I don't fly Futaba. You don't need, nor do you want, anything fancy with the radio's gyro settings. It is all handled by the NAZA.

For the bouncing issue you are finding, make absolutely sure that you have no mechanical play in the tail rotor system. I had this problem like you, when I had a tail that had a slipping bevel gear on the tail output shaft. Because it was moving laterally on the shaft, the tail pitch was changing under load and NAZA could not keep the tail straight. It bounced back just like yours. Finding this mechanical issue fixed the problem.

There are break settings with NAZA, and you might need to adjust them. If you find no mechanical issues with the tail, then start to adjust the tail breaking a little at a time, evenly. Then observe to see if your changes are making the bounce better or worse, and compensate appropriately.

Joel
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05-15-2013 05:21 AM  6 years ago
Fly1-1

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Neumarkt, Bayern, Germany

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Joel,

Thanks for the info, I did not know I had to adjust the tail pitch rod to compensate for the CCW drift in rate mode. As far as the bounce in the tail I'm still adjusting the screws conecting the slider to get out as much play as I can. The gears to me seem like they have a good mesh and it spins freely if I make any kind of adjustment, moveing them slightly closer I get a small amout of binding so I just keep it as is. I didn't like the tail gear assembly that came with the heli so I put one on that I thought would be rock solid with modifications to the tail boom. It runs smooth so I'm guessing it could still be the little amount of play still left in the slider. I was thinking that it might be caused from where I mounted the GPS. Where I have it, it falls in the rotor wash but the first test flight in HH cause I don't have rate set up yet it was rock solid no wag or bounce. I have the TX figured out. Although I'm still hunting for a good thottle and pitch curve. When I do the setup and set the P1 to 38 I'm not getting 0 or -2 pitch it's more of a hover pitch with around 4 degrees. I will keep playing with it till I get it right. And I finaly got the firmware updated it was a computer issue.

Erik
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