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rudder mixing

Old 08-30-2010, 08:43 PM
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Default rudder mixing

has anybody heard of putting throttle mix on the rudder channel to compensate for the heli dropping when turning right and raising when going left?

Trex 450 se v2
dx6i

Old 08-30-2010, 09:00 PM
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Default RE: rudder mixing



Are you sure you are keeping throttle (pitch) stick at the same level when you give rudder? You might actually be moving the stick at an angle. Perhaps I'm wrong and I'm the one who is moving the stick unconciously. I have not heard of that problem. I do have to adjust the pitch (stick) on an HK450 because the head is not as rigid as a true Trex 450. There is a lot of play...

Gilles</p>
Old 08-30-2010, 09:02 PM
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Default RE: rudder mixing

most modern gyro do not use this feature.  What gyro are you using? 

This was mostly used before heading hold gyro's were available.
Old 08-31-2010, 08:16 AM
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Default RE: rudder mixing


ORIGINAL: noobflyer01

most modern gyro do not use this feature. What gyro are you using?

This was mostly used before heading hold gyro's were available.
You're thinking of revo mix which is adding rudder to throttle inputs to compensate for torque changes.


Yes, we did it years ago. Most that set it up now just use a little bit of cyclic to throttle mixing though if you wanted to you certainly could. So many people fly governors now that mix tinkering is a lost art.
Old 08-31-2010, 10:01 PM
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Default RE: rudder mixing

I just noticed that when doing piros,the heli. wants to drop or go up when hovering, (still learning the basics), I have to turn slowly or it will drop, if doing them faster i have to give some throttle stick. so thought maybe some mixing might fix the problem.
(jr 770 Gyro)
Old 08-31-2010, 10:48 PM
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Default RE: rudder mixing

Anything loose on the head that would cause the pitch to change (swashplate to drop)?

Gilles
Old 09-01-2010, 04:54 AM
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Default RE: rudder mixing

there might be too much binding on the tail system that is loading up the main.... normally the tail loads the whole system but not that much that the heli drops altitude...
Old 09-01-2010, 10:24 AM
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Default RE: rudder mixing

Again, it's normal.

Add tail rotor pitch to turn into torque and it takes power away from the drive system causing the heli to drop slightly, take pitch away and let torque piro it the other way and your increasing the efficency of the drive system causing it to go up a little.

Most people just compensate for it automatically, just like seeing the heli lean a little to the right becomes normal.
Old 09-01-2010, 11:19 AM
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Default RE: rudder mixing

I use a rudder to throttle mix.....

old school I guess, but it helps keep the heli level in fast pyro's
Old 09-01-2010, 10:13 PM
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Default RE: rudder mixing

thanks, I might play with it a little and see what happens, I just figure any little bit to help make it fly better is always a good thing,
Old 09-02-2010, 09:18 AM
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Default RE: rudder mixing

Try about 18 to 22 positive throttle with right rudder and take about the same amount out with left.


EDIT: Unless you happen to be flying a Kavan or Vario with a left hand rotating main rotor
Old 09-02-2010, 06:57 PM
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Default RE: rudder mixing

if you add rudder mixing on a Heading hold gyro will only mess the settings up... Revo mixing is more on the olden days were mechanical gyros were used... its as simple as helping the tail pitch without the help of the fingers.. but on a heading hold gyro this will result to a command from the pilot.. so instead of just holding its tail it will move the rudder...
Old 09-07-2010, 03:28 PM
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Default RE: rudder mixing

Just to be clear, he's not talking about REVO mixing, he's talking about adding THROTTLE when a right rudder command is given and taking away throttle when a left rudder command is given.

It won't do anything to the gyro, heading hold or otherwise.

REVO mixing is adding rudder when a throttle/collective pitch change is given.

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