502 question

[Ivan]

I am having some troubles with my 502.

I can adjust the gain up to the point that the tail will oscillate, and back it down until it stops, but I still get a pronounced jump in the tail when using moderately quick and faster collective inputs.

If you were to punch it from a hover, the tail will jump about 4-6" to the left, and then lock in. Trying to do any pumping maneuvers makes the tail feel like there is no gyro at all, so to speak. the tail does what ever it wants with in about a 30º arc.

Is there a setting that helps this?

Is there a definitive guide to what all the setting in the gyro mean? The manual leaves quite a bit to be desired.

thanks for any help.
Ivan

[delamar]

Higher head speed will probably fix this..... I always see ppl at the club wonder why the tail is loose, they bump the head speed up/and tail speed and the problem is gone.

Could also be crap or too small tail blades. Or mechanical slop. My bet is head speed. What machine do you have and what head speed, and what tail blade size.

[Ivan]

Vigor, the long V tails, Haven't tached the head, but I am guessing about 1850.

I have done research, and found on one of Futaba's websites, that the 502 is the same as the 401 with a digital display, and more adjustments. So, I am guessing that is the problem. It is acting like all the other 401's I have had.

Time for an upgrade.

[flyinfool]

I just helped some one set up a Vigor today with a 401, it did not have any problem holding the tail rock solid thru all kinds of collective pumping, once it was set up correctly.
Do you have your linkage set up so that the tail slider can go from stop to stop on both sides of its travel?
You do need to get your head speed tached, the one I set up today was running 1900 and it worked great.

[Ivan]

Headspeed really has no effect. I can set the throttle curves up to give me obviously high head speed and it is the same.

The mechanical setup is sound. Full travel in either direction, free movement, and no slop.

I am not a novice at this stuff either. I have set up old telebees, CSMs and even some arcamaxes that were about as good as this gyro, and they weren't even the silicon ring technology. I truly believe that it is some electronic calibration, and like I said the instruction manual is less than satisfactory on the explanation. It would be nice to get a native English, plain language explanation of what each setting does. Kind of like the old CSM 540 docs and the stuff written by their pilot.

Thinking about it, it really acts like a 540 with the heading hold gain turned down too much, making it kind of a half normal, half heading hold gyro.

[delamar]

Ivan, i had the same problem when i mounted my old 401 near the collective servo. There would be a interference problem when ever the collective servo did something big. Thats why the newer gyros come with a steel plate they mount on. Where do you have your gyro mounted?? Near servos? or at the back? If its near servos, move it away.

[Ivan]

The sensor is mounted under the battery tray, upside down, above the tank. It should be fairly well isolated from servos and vibration. I have the steel plate with it as well. There really isn't a horizontal flat place on the vigor other than the battery tray to mount it on, or else I would try that.

The servos on the Vigor are all near the top of the frame. The closest one is probably the throttle servo, but that is still over an inch away.