Gyro 611 Dual rates

[Tommy]

Do people use dual rates as standard for the 611 as I am finding the rudder movement extremely rapid before the end point of the tranny stick and can I only assume this is the way to combat the problem?

[robgt]

No dual rates in use on my 611.
Some people set them up using Dual Rates, others (like myself) user rudder ATVs.
I believe you shouldn't mix the two though.

Do you have any exponential on your rudder? I don't use any of that either, the end result being a linear rudder. Perhaps you have expo which softens the response at the start of the stick movement, but then compacts more into the latter part of the stick travel?
Cheers,
Rob

[Tommy]

Thanks Rob

I have limited the the EPA on the 611 itself hence the reason why the movement is so quick. Have just before read your reply inputted some dual rates which seemed to slow the movement nicely. Any ideas why they say not to limit epa on 611 and use dual rates on tranny. I take it the rudder spin is rapid with full epa's?

[robgt]

I'm not positive to be honest.
When setting up the 611 my way, you leave the Rudder ATV (end points) at 100 and then adjust the Limits on the gyro amp so that the mechanics don't bind for left and right travels. Those values (LMTA and LMTB) should be equal.
You then adjust the gain from the Tx while watching the gyro amp screen - somewhere around 35% to 37% is usually right, but can vary slightly.
Finally, you adjust the pirouette rate by increasing or decreasing the Rudder ATV values.
Everything else can be left at factory default settings.

I believe the same effect can be achieved using dual rates instead of rudder atv, but I've never done it that way and do not know if anything else is involved.

Cheers,
Rob

[HiroboFreak]

What Tx are you using?

JR uses (+) expo to soften around centre, Futaba/Hitec uses (-) expo to soften around centre. Make sure you don't have them mixed up

I use a little expo on the tail. "Linear" is actually not linear due to the servo's rotational sweep. It is faster around centre then slows down as the servo rotates. (basic geometry)

Around 15-25% (+) expo (on JR) makes it close to linear.

I use this amount on rudder as well as cyclics.

Make sure you have the gyro in "rate" mode when checking stick response for a more accurate check.
Or have the "Limit" screen up on the amp as this sets "rate" mode while viewing that screen.

[Steve]

^^^^^ I'm with Rob. Have done my one this way as well.

My end points on the rudder are set to 100% on my 611 and it's plenty fast enough piro rate for me. It's not as fast as some, but I like it. It could go much faster if required.

I do however, use a bit of expo on the rudder, personally. Softening the rudder control around the centre position helps to limit the skew during pitch changes - i.e. if you do a stationary flip then there is a risk that you can inadvertently move the tail while shifting the collective through the negative part, and the heli could come out skew-wiff! A bit of expo can help you out with stuff like this. I think I have 15% on mine.

I've read many times on the forum of people having problems with helis coming out of a flip pointing a bit off their original heading, and often the assumption is that there's a phasing problem. There could be, but checking the stick input is a cheap thing to try first - it could be just the thumbs doing it.

[Tommy]

Many thanks for advice much appreciated will defo put 100% linear curves back in and go from there. Am I am right in saying that I should read the gain (actual gain) of the main display (where it also shows battery voltage) rather than the gain inputted in the appropriate function?

[robgt]

Yes, thats right.
You adjust the gain from the transmitter while watching the value on the Amp screen.

Cheers,
Rob

[Tommy]

Thanks Rob and everyone much appreciated have now ensured that everything is linear on 611 and will just play around with expo and d/r if needs be. Think I got bit confused previously cos I bought heli off mate and expected it to be set up right for me and my transmitter. Oh no, no chance! Back to the start! Think I now got is sussed, thanks lads once again for good advice.