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HelicopterAerial Photography and Video › Spartan visionLock\401 combo on Airfoils mounts for tilt??
01-28-2007 04:36 PM  10 years agoPost 1
Beauregard

rrApprentice

Steamboat Springs Co.

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I would like to take some work out of the tilt control and the Visionlock

http://www.spartan-rc.com/products/.../visionlock.htm

in conjunction with a 401 looks promising.. Has anyone used this on an airfoil mount?? Will I need to exchange the servo?

Thanks,

Cedar

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01-28-2007 06:47 PM  10 years agoPost 2
shootfromabove

rrApprentice

Eagle River, Alaska

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Cedar,
I am using that setup on my Airfoil mount and it works very well.
I am still using the servo that came with the mount, I tried switching to a faster servo, but it didn't seem to make much difference. I think because for AP we are flying as smoothly as we can anyway the fast servo isn't really needed? Anyway the vision lock helps my camera operator out a lot, thet say it it much easier to 'lock on' to a subject.
Hope this helps, Pat

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01-28-2007 09:12 PM  10 years agoPost 3
Beauregard

rrApprentice

Steamboat Springs Co.

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Pat that helps alot.

Cedar

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01-28-2007 11:00 PM  10 years agoPost 4
tech1

rrVeteran

Mississauga

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I'm having some problems with servo drift. The mount will continue to drift slowly in the last direction of travel.

The movement is slow so it doesn't seem to affect the video much.

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01-29-2007 12:13 AM  10 years agoPost 5
Beauregard

rrApprentice

Steamboat Springs Co.

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I wonder if this combo would work on the 360* pan servo?

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01-29-2007 06:02 AM  10 years agoPost 6
Stet

rrElite Veteran

Key Largo FL

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The tail rotor gyro already does most of the work for pan, at least for stills

keepin' it real

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01-29-2007 02:04 PM  10 years agoPost 7
harrysvr

rrNovice

eu

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I have the same question...

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01-29-2007 02:32 PM  10 years agoPost 8
vagabund

rrNovice

Switzerland

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Hi,
I used the VisionLock on a self made mount, together with a GY-401.
It does the following:
If You give a direction input to the right, normaly a servo turns right and goes back to center after you released the stick. VisionLock makes your servo turning slowly to the right as long as you keep your input. After releasing the stick, the servo stays where it is. You can give direction input to the left and the servo goes to center position and keeps on turning left, as long as you give a direction impulse.
Mathematicaly spoken, VisionLock makes a integration of your direction input.
That's exactly what You need when working with a gyro stabilization.

Now I work with an Airfoil MiniPro. The servos delivered with the mount are modified, the function of the VisionLock is already in the servos. Adding a VisionLock to this servos brings no benefit, the servo wouldn't stop rotating.

I have a GY401 for Pan and a Gyro 180 (without HH) for nick. You need to switch from HH to regular mode for take off an landing, otherwise the mount can start rotating the heli while standing on the ground.

Hope You understand my bad english, my mother tounge is german...

Regards

Ueli

small Helis in a small country

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01-29-2007 05:33 PM  10 years agoPost 9
Beauregard

rrApprentice

Steamboat Springs Co.

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Ueli Great info,

have you tried video with the minipro?? I'm hoping the gyro can hold tilt position smooth enough that video is possible.

Thanks again,

Cedar

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01-29-2007 07:59 PM  10 years agoPost 10
ESWLFSE

rrElite Veteran

Liberty Hill, TX

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401s and Vision-Locks are working well for me on the Spartan gimbal. DT and fine steps almost zero the drift. With the HCS mount I couldn't get rid of the chattering in the servo caused by the gyro. Not sure if if it was the loose gear lash, loose pivot shafts, servos, gear ratio, general flexibility in the mount, or what that caused it but it no longer exists on the BB Spartan gimbal.

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01-29-2007 08:37 PM  10 years agoPost 11
vagabund

rrNovice

Switzerland

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Hi Cedar,

yes, I did some tests with video. No customer jobs yet because of video downlink problems, mentioned in another thread.

For tests, I flew in windy conditions. The ship was shaking roughly. The gyro smoothed the video but it's still a little bit shaky.

It's amazing (and confusing!) when you pan the ship and the mount stays in the exact position. The camera operator told me that he was having no clue what I'm doing with the ship because the cam looks in the same direction all the time.
For smooth video you must fly very smoothly, supported by a autopilot system. I use the helicommand - which is not perfect.

Regards

Ueli

small Helis in a small country

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01-29-2007 08:40 PM  10 years agoPost 12
Angelos

rrKey Veteran

nr Oxford, OX11, UK

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There are two main reasons for the chattering:
1. As mentioned: something loose. Backslash on the gears or poor of shafts that they don’t run perfect can make it very difficult for the gyro to lock in the desired position.
2. Most modified servos ramp up to full speed with very little stick movement. When the gyro is in charge it controls the mount as if it was a helicopter tail… proportional speed increase from centre to full speed. If the modified servo ramps up to full speed too fast it overshoots and starts oscillating.

Even if you find a servo with wide enough proportional range to allow a gyro to work direct the VisionLock still works better. First if offers endpoints so your cables will not get twisted as you gyro tries to maintain heading every time the helicopter turns. Also, it lets you to quickly “park” the camera to specific position for emergency landing… sometimes useful for cameras with long lens that touches the ground when pointing down. Finally, although the basic principle is integration the VisionLock does more than that by emulating the behaviour of a real helicopter tail like control asymmetry due to main rotor torque, tail servo speed etc.

-Angelos

Spartan RC R&D

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