Some help educate an idiot on Gyro gain via endpoint and then gyro sense menu

[John Cook]

I read one thread and think I have it, then another and I'm confused again.

I want to understand this b/c on most of my helis I use the gyro sense menu, but on my Trex 500 I have a 6200Rx and have to use the gear channel. I'm currently at 44 on my endpoint, but I'm not sure if this is 44 gain or if I'm at some number lower than that as when I have my USB spartan dongle hooked up it reads a lower gain number in teh software about 10-12 pts lower. I don't want to be hard on my rudder servos and want to understand how to optimize all of this

I know on an X9303 on the gyro menu you coul typically be in the 50-60's for head holding but past not having the tail wag and the tail holding I was never sure what my actual gain was.

On my 12x I can set T lock and a lower number which I ASSUME is the gain number, but again who knows!!!!!

[Pinecone]

1) The gain numbers are only a way for you to tell if you are increasing or decreasing the gain. Stop obsessing over what number you are running. If the tail wags, turn it down. If the tail doesn't hold, turn it up.

2) Using end points 0 - 100 is heading hold, 0 - -100 is rate mode. The higher the absolute value (number ignoring the sign), the higher the gain. 50 is more gain than 40. -50 is more gain than -40.

[John Cook]

1) The gain numbers are only a way for you to tell if you are increasing or decreasing the gain. Stop obsessing over what number you are running. If the tail wags, turn it down. If the tail doesn't hold, turn it up.

2) Using end points 0 - 100 is heading hold, 0 - -100 is rate mode. The higher the absolute value (number ignoring the sign), the higher the gain. 50 is more gain than 40. -50 is more gain than -40.

Alright, I can accept that.

If the numbers are only relative, then why does everyone seem to obcess about it so lol, including myself, from reading other posts about #'s.

Well not going to worry anymore, just wanted to make sure a big puff of smoke and flames weren't going to shoot out of my tail servo anytime soon due to my gross stupidity.

thx

[Pinecone]

The other thing to remember, you don't win a prize for running the highest gain. :)

To protect your tail servo, run the lowest gain that holds your tail flying the way YOU fly.

[Bob O]

Good advice Pinecone. I'll use it as well.

[Coolice]

1) The gain numbers are only a way for you to tell if you are increasing or decreasing the gain. Stop obsessing over what number you are running. If the tail wags, turn it down. If the tail doesn't hold, turn it up.

2) Using end points 0 - 100 is heading hold, 0 - -100 is rate mode. The higher the absolute value (number ignoring the sign), the higher the gain. 50 is more gain than 40. -50 is more gain than -40.

Hey,

I'd just like to add to Pinecone's response if I may and say that in some instances 0~100% ATV on a gain channel does not relate to 0~100% gain on the gyro.

What I have found in some gyro to transmitter setups is that 0~50% in one ATV direction = 0~100% heading hold gain (or rate mode) and 51~100% = 0~100% Rate (or heading hold) gain.
I have found this more apparent when using a Futaba gyro on a JR transmitter mainly if memory serves me correct.
You can check if your setup falls into this catagory by changing the ATV value and observing the gyro's status LED if it has one. I found once on one of my models that run a GY401 that when the ATV got below 50% the red LED would turn off, signalling that it had left haeding hold mode and entered rate mode.

Just something for you to be aware of.
.

[John Cook]

The other thing to remember, you don't win a prize for running the highest gain. :)

To protect your tail servo, run the lowest gain that holds your tail flying the way YOU fly.
yeah I've read that before and try to use that info :)
thx

I was just worried more about having things in a proper range, but it appears it's relative.

[Pinecone]

Well, my Vibe 50 with 770 3D/8900G was running a Gyro Sense gain of 54. :)

It is what it is.

[John Cook]

ok cool

well on my X9303 I would generally run in the mid/high 50's sometimes low 60's in gyro sense. On my 12x with T lock in gyro sense I have my TREX700 set at 30 something, as the same gyro sense setting with T lock on caused a WICKED wag durring FF. Seems the 12x with T lock on is a more accurate % of gain, not the formula of w/e it is with the regular JR Gyro sense. TBH I'm not really sure if I could go higher or lower. The tail holds for what I do, which isn't a whole lot. But I don't want to start trying some funnels or tail slides and have a blowout as I think I might poo myself :O.

May I ask pinecone how you "figure out" what's enough gain w/out too much?

I know about wag, I've seen it so I guess I can know TOO much, but what I mean is. People like you say don't run more than you need, you'll end up being hard on the tail servo. So by too much I mean more gain that I need to run. Is there certain tricks to figuring that out. Right now it's kinda of a guessing game for me. Set to a point on setup, if it wags tune it down until it doesn't and generally several points past that for some "headroom". If it doesn't hold, tune it up until it holds for my flights, plus a few points etc...

I dunno!!! Sorry for the seemingly noob questions, but I guess I never really understood the finer art of this, and I would like to know. I can keep going the way I have, and I guess it works. But, if I can tune my gain a bit better, and insure a longer life for my tail servos, or try to make sure my tails not going to let go when I get to doing some tail slides/funnels(which are going well on the sim, but haven't had the guts in real life yet).

[BarracudaHockey]

If you can't do tail slides just fly sideways as fast as you can, tweak the gain up till it holds.

If you're more advanced, backwards loops or tail slides. If you dont have enough the tail will feel mushy. If you have too much it will wag, especially in fast forward flight.

Another thing to do is land and feel the tail servo, if its running cool you're fine, if its hot you're running too much gain or have binding in your linkages.

Like he said, don't obsess over numbers.

[John Cook]

ok thx :)

[Pinecone]

BTW I had to run the gain that low to get rid of wag, but had some bonce back with piro stops.

So I moved the ball in on the servo, turned the limit up, and was able to increase the gain to 62, and no wag and no bounce back.

So play with various options to see what works best.

[Bob O]

Wow, great information in this thread!