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Scorpion Power Hitec RCD
rowdog_14

Senior Heliman

Marietta, GA

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So I changed my good heli electronics from one heli to another and I have a old 30 century hawk that I put some JR 537 servos in. I know this servo is not the best tail servo but just want to get some input.

So I am trying to set the tail up mechanically for no drift on a GY401 in NON HH. No matter how I set it up I get either a slight drift CW or CCW with just one turn in our out on the tail ball link. I can not get it to hover with no drift.

Is this because of the quality of the servo not being able to hold the tail pitch?

01-09-2017 03:38 PM
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jason46

Veteran

MI

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That servo is kind of slow, might feel sluggish but shouldn't drift in a hover.

If you get it close as possible does it fly okay in HH?

I'd look for a slightly better servo and a deal on a spartan gyro if you can find one.

We made up some rules can we have your moneys now.

01-13-2017 01:19 AM
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rowdog_14

Senior Heliman

Marietta, GA

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Yeah it drifts even with small sub trim movements and doing the relearn of center for the GY401 after I make the trim change.

As far as the HH. It will hold a solid locked hover with HH on and flys fine with HH. Even with a jacked up mechanical tail setup.

Just wondering, other than the obvious tail servo that needs to be upgrade from the basic NES 537 I have, why would I want to upgrade to the Spartan if the GY401 works for me? For me all I do is hovering, figure 8, typical circuit flying. I know the GY401 is old but just wondering what would be the benefit in my case?

01-13-2017 01:24 PM
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Pistol_Pete

rrProfessor

Seffner, FL

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If I recall correctly, your radio (9303?) may have a menu where you can adjust the steps of trim. Default being 5, so try lower.

Then make the 401 relearn center.

Another option is to move ball on servo arm where it may make up for that extra "off center" turn on ball link.

~~Enjoying the hobby one flight at a time~~

01-13-2017 01:35 PM
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rowdog_14

Senior Heliman

Marietta, GA

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I have the 7202. I do not think I have that with the 7202. I will look. Also I will try and move the ball.

01-13-2017 06:46 PM
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2LTime

Key Veteran

Walworth,NY

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although it's been a long time since I used a 401, especially in rate mode(non-HH), you're expectations may just be too high. In rate mode, wind will effect tail drift, any cyclic will cause drift, any change in head speed say from an inconsistent engine will cause drift, mixture changes will cause drift. That's why everything went to heading hold. From what I can remember, the 401 has one dial for adjusting travel, meaning any change will have an affect in both directions. For this reason I think we used to set them up with the tail in it's mechanical middle position. Meaning it hits a stop on either side at the same amount of travel. I do remember using servos just as slow as yours and probably worse and they worked fine for general flying to moderate aerobatics.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

01-14-2017 02:11 AM
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rowdog_14

Senior Heliman

Marietta, GA

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Yeah I have been trying to set it up when there was hardly any wind because of the drift that will happen with the effects of the wind affecting the tail.

Yeah first time really trying to fully setup this low end servo on a tail. I tried before but switched it out for a tail servo that day so I agree I am probably just chasing a rabbit down a hole and expectation for it to not drift is too high . I will get it as close a possible. HH it flies fine.

Thanks guys for the inputs.

01-14-2017 12:57 PM
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JuanRodriguez

Elite Veteran

The Villages, Florida

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I agree with 2L Time in that you're chasing your tail with the expectation that you will get NO drift whatsoever while making your rate adjustments.....

However, if you want to continue to chase your tail one thing you might want to try is replacing the ball link at one end of your tail rotor pushrod with a ball link that allows you to install it from either side. Thus, you can get 1/2 turn adjustment rather than the full you're experiencing now.... One such ball link is the Rocket City links.

The other thing to consider is the issue of using "sub trim"......

Going from memory here but I believe the user manual tells you NOT to use sub trim to make any adjustments for drift....... The way I used to set mine up was to center the trim, make sure "sub trim" was set to zero and then make all of the initial adjustments for drift while in rate mode by adjusting the push rod.......Once I got that dialed in "close enough" then HH was perfect...... I did ALL of my flying in HH from takeoff to landing..

dkshema is very good at setting these up so if he sees this, he may comment....

Been there, done that and old enough to know better.....

01-14-2017 01:53 PM
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rowdog_14

Senior Heliman

Marietta, GA

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Yeah subtrim can be used as long as you perform the relearn center for the GY401 and that is start in HH and click back in forth between nonHH and HH at least 3 times and end back at HH mode. It relearns your center based on subtrim. If you do not do that then switch to HH then in HH the servo takes out the subtrim.

I got it as close as I could get it today. It is flying great with very little drift in non-HH mode. I then went back and setup the HH and delay as needed for this slow servo. I feel good with it now. non-HH is fairly good with a very slight drift and HH is locked in.

01-15-2017 04:14 PM
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