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08-20-2008 01:33 PM  12 years ago
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KarbonBird

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Australia

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Front Mount - Gyros on 2 Axes
Have been battling with the setup of this front mount as no instructions were received with it and I also can't get hold of the supplier.

I have now moved the gyros as follows:

1 on the LHS gimbal arm; and

1 on the arm which connects the gimbal to the T-Rex 600 frame.

I am using a X2610 JR radio and have the gain (for both gyros) connected to the gear channel on the receiver using a Y cable. The pan is on the rudder channel and the tilt is on the elevator channel.

When I start the gyros up the pan spins to-and-fro erratically. Both the Throttle (mode 1) and elevator sticks actually move the pan. If I move the throttle to mid stick then it is approximately centered and then I can move the pan using the rudder stick. If I increase the gain on the radio this affects the amount of travel.

I reset the X2610 before I started trying to configure the setup however it looks like there may be some conflicts with the way I am doing things.

I would be interested to see someone's x2610 setup - in particular the RX mappings and where they point to on the CSM 720 gyros that I have installed. If anyone has some kind of brief setup procedure for a 2 axis gyro that they can send to me that would be appreciated.

The pictures below should provide clarity.

KB

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08-20-2008 02:22 PM  12 years ago
cranester

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Bogota, Colombia

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here how mine is wired

CH 1 and 2 come from the gyro, CH 5 takes the two other wires (yellow) coming from the gyro both on the same channel concetedwith the red plugs
Juan Crane
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08-20-2008 04:32 PM  12 years ago
lele

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italy

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KarbonBird
it seems you are using an heli program on your mount radio and that you have some revomix applied that's why as you move the gas stick (tilt in your case) you get a movement also on the rudder ch (pan in your case), check that and in case just disable it.

Lele
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08-21-2008 04:10 AM  12 years ago
eyeinsky

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Fall River, Nova Scotia, Canada

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Karbonbird

Both of my machines have only one gyro stabilised channel each, one pan and tilt on the other. One use a pan neutral pot servo witch has tendency spin in one way or the other if the trim is not just right and dose not work very well with my older radio with the slider type trim. The radio channel limit is set to +12% and -12%. This makes operator input small give you nice pan. The gyro is in rate mode 40%. I use gear channel for gyro rate, aileron for pan and elevator for tilt. I use the rudder channel to zoom and throttle to operate the shutter.

On my other machine I use live pot servo. This is much easer to setup. Its gyro also is in rate mode about 40%. I limit the travel with the channel limit and use the trim to change large angle of camera in its operating range. If I don't do it this way the camera controls to fast.

Does the CMS 720 have manual adjustment pot if so try that. Im guessing your servos are nuetral pot set up. You will want to limit the travel and trim till it stops moving. Then connect your gyro and ajust the rate for best control.

good luck
Hard job competing with gravity.
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08-21-2008 06:49 AM  12 years ago
KarbonBird

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Thanks Juan - makes sense now.

Lele - you are spot on - that was the problem. Now on plane mode and all is good.

I appreciate the detailed explanation eyeinsky and will give it a go tonight. Can you please clarify though that given you believe that only one gyro is necessary for Pan & Tilt, how do they operate independently (or did I misunderstand that bit?)

I guess what I am trying to understand is the methodology (I'm not sure what I am really trying to achieve). Is the objective to have pan and tilt act as "self levelling" devices to iron out certain bumps during flight? If that is the case would "heading hold" or "normal" mode be required to maintain a level state?

Hope that what I am asking is clear. In summary, the overall objective is to use 2 x gyros to get the most stable heli environment for the video camera.
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08-21-2008 01:39 PM  12 years ago
eyeinsky

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Karbonbird

No you need two gyros for Pan & tilt. My two machines have only one channel gyro stabilised. One has pan stabilisation the other has tilt stab.

Tilt gyro stab and gravity on roll. (Live pot servo)
http://www.youtube.com/watch?v=9MnwBkgfq5U

Pan gyro stab and gravity tilt and roll. (Neutral pot servo)
http://www.youtube.com/watch?v=z1KahzqvgGw
Hard job competing with gravity.
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08-22-2008 03:30 PM  12 years ago
KarbonBird

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Right, I have configured the two gyros to work on the pan and tilt axes but ....

I am still not clear as to what the actual work of the gyros is in terms of making for a stable platform for video. I have tried reversing the gyros so that they work in an opposite direction to the movement but in both HH and Normal mode they appear to get confused and are almost useless if the heli is rotated 360 deg after initialisation. They travel to one side (pan) and then just stay there. This is of no value at all for video stabilisation.

What I am still trying to determine then is:

How does the gyro do the job of smoothing out the heli mounting?

How does the gyro return the mounting to the centre if the heli has turned 360 degrees?

What is the preferred setup for a 2 axis gyro system i.e. what channels to use and what gain?

What other requirements are needed to get the gyros working together as a platform stabiliser?

I am really keen to test this rig out tomorrow so any information would be welcomed.

TIA
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08-22-2008 03:54 PM  12 years ago
cranester

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Bogota, Colombia

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How does the gyro do the job of smoothing out the heli mounting?
The camera operator will not have to correct for any unexpected movements by the pilot, also any sudden movements caused by wind or hard stick inputs will be dampened to an extent.

http://www.youtube.com/watch?v=u1fgIuM1vFA
Juan Crane
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08-22-2008 09:51 PM  12 years ago
KarbonBird

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Australia

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Thanks very much Juan - this is very helpful.

Just wondering then how this would work with panning on a front mount as it is not possible to maintain the hold for 360 degrees if the heli is rotated after initialisation.

Is the heli in heading hold?

KB
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08-23-2008 12:36 AM  12 years ago
cranester

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Bogota, Colombia

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mmmm... I don't understand your question, but Its the exact setup I had on my front mount, didn't change any settings on anything, works exactly the same for the underslug/front mount.Juan Crane
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08-23-2008 12:49 AM  12 years ago
eyeinsky

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Fall River, Nova Scotia, Canada

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Karbonbird

My fwd mount will pans 360 but the airframe comes into the shot, this requires pilot adjustment to put the mount in the operating area. Remember if rotate 360 in one you have unwind in the other direction so plan your shots. I use the HH setting at “0” to give pan stab off position for the camera operation and rate mode at 40% for pan on.

Aileron = pan
Elevator=tilt
Rudder=camera zoom
Throttle=shutter
Gear = gain
But I don’t think there is a standard.
Hard job competing with gravity.
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08-23-2008 01:20 AM  12 years ago
KarbonBird

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Australia

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Thanks Juan and eye...

I have done some more fiddling, using rudder, elevator and gear. I set gain at 49% (I'm using CSM 720s so this may be different to 401s). It seems to work pretty well now so I may just head outside to give it a test flight.

The testing I have done so far suggests that it works best in normal (non HH mode) and will need to make allowances for the fact that it won't be rotating more than about 75 degrees. If I rotate the heli 360 deg then it just stops at its end point of travel compensating in that particular direction. If i rotate it back a small amount then it seems to find a centre spot and starts working normally again.

I don't see these issues as being too much of a problem as I intend using the camera for still work as well.

This is a sample to see it in action:
http://www.youtube.com/watch?v=axs7JTug4SA

Thanks again for the info in getting this (rather tricky) process up and running.

KB
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08-23-2008 01:29 AM  12 years ago
eyeinsky

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Awesome Dude

Set the HH for "0" this will be gyro stab off.
Hard job competing with gravity.
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