14mz and delay for 601 gyro

[ledfoot]

I blew out some tail gears yesterday in my Raptor 90 while practicing piro fips. I'm not sure if this was caused by faulty gears or the high frame rate of the 14mz. I have heard that you should set a delay on the stop of the 601 to avoid this happeing so I have set 15% delay on the D1DA parameter of the 601.

Are you guys running a delay on your 601's and if so, how much delay is necessary?

Thanks.

....led

[DavidH]

I don't have a 14 MZ. But I do have a 9Z and use the channel delay that is located in the program of the 9Z. I would think the 14 MZ has the same thing in its program.
I run about 40% channel delay on the rudder channel. The delay in the 601 program was only put there for radios that do not have channel delay.

I don't think the 2048 PCM would have an effect on the 601. Since the 601 utilizes its own refresh rate and update.

The AVS menu in the 601 program also controls how hard the gyro allows the stops to be.

David

[cdrking]

David,

Why do you run 40% delay? Is that for certain maneuvers or does this just suit your style of flying better?

Thanks,

Jeff

[DavidH]

Jeff,
I like the delay because the stops are a little softer. I don't like the tail to stop like it hit a brick wall and is trying to tear up the transmission. Just my preference.


David

[EricLarson]

Hi Led,

You will have to forgive me if I link this post to the MA forum :twisted: as the tail gear thing seems to be a reoccurring. This has nothing really to do with the MA tail gear post other than some tail gears will fail for various reasons. It is pretty hard to 100% eliminate stripped or broken gears all of the time, but some things do make a huge difference.

First, where the gears broken (split or they came off the shaft) or where they stripped ( no teeth left but the gear is still ok)?

You should not run the gain in the GY601 over 40% for any 3D flying. I run 36% on one and 38% on my other one. Just set it high enough to get it to hold well. Any higher will cause major stress on the tail and gears.

Other than the gain I don't set anything different than stock in my 601's. You can fiddle with the settings some to get it customized for you, but I am personally pretty happy with the stock setup for my style of flying.

As far as the 14MZ issues with the 601, well I don't think there are any. The signal is input to the GY601 control box and the control box sends the signal to the servo. I don't know of any way that the frame rate or transfer rate would really affect the speed of the current 601 setup. I personally went from a 9C to the 14MZ and did not notice any real difference on the tail. I did notice a significant change on cyclic with the ECCPM setups.

Keep in mind also the gear problem could be caused by something wrong in the tail box. Bad bearing or flex in the box possibly. Or it could just be a fluke and you may never have a problem again.

I hope that is some help.

[ledfoot]

Thanks for the responses guys.

Eric,

A large chunk broke off of the output gear. I run 37% on my gyro and at the time I was also running 15% delay. It also turns out that the 601 gyro unit has failed. I fixed the tailbox last night but did not test anything on the bench since it was late when I finished. When I went to the field today and turned the heli on, I noticed that the gyro would not turn on.

This is now very puzzling; did the gyro fail and somehow cause a failure of the tailbox? I was able to auto the heli down and did not hit the tail but who knows :(.

I will remove the delay since you are not having any issues with it.

Thanks.


....led

[EricLarson]

Boy, it is possible that something was going on in the control box. Does it power up at all? or is the screen dead?

If a large chunk broke off the gear, that usually means the gear failed. If something else was wrong such as teeth missing or bad wear pattern it is usually gear mesh and or something moving.

The 601 not working is too much of a coincidence though. Maybe it got damaged in the landing, but that still does not make sense. Send it to Hobby Services and see what they have to say.

Either way, that sucks.

[ledfoot]

The 601 will not power up at all. There was nothing damaged in the landing since the auto was uneventfull.

I plan on sending it to Hobby Services tomorrow.

Thanks again.

[wore-out-pilot]

Hi Eric, Are you running avcs mode or cmt mode? The reason I'm asking is in cmt mode anything below 50% the gyro is not in heading hold.

Thanks,

[DavidH]

Eric is talking about the actual gain that is showing on the home screen of the GY 601.

If using the channel 5 ATV to control the gain of the GY 601. It really does not matter in CMT mode if you go below 50% with the ATV. The switch for channel 5 will determine if it is AVCS mode or Normal mode. When using the ATV on Channel 5 to adjust the gain, or which every channel the gyro Aux is plugged into.
Then the ATV will pretty much coorespond to what the gain value is that is showing on the GY home screen.

Now when using the DUO mode in the 9Z WC and WC2. 0 to 50 % is either AVCS or Normal mode, and 50% to !00% is either AVCS or Normal mode. Which precentage value does what will be determined by which direction the gyro channel is set in the reversing menu of the radio.

David

[EricLarson]

:) yep.

I use the gyro menu in the 9C or 14MZ and it will say which mode you are in and the coresponding gain.

If you look at the screen on the gyro, that is what is controling. You can be at 10% and still in heading hold as long as the gyro indicates AVCS mode.