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Old 03-26-2017, 03:50 PM   #6 (permalink)
A VIKING
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Join Date: Dec 2012
Default Ground Tests Complete

I tested the ability of the cargo hook controlling servo and pin to release the load by ground test.

I wanted to get an idea of what the maximum weight could be hanging on the release pin and still be able to release the load.

I bought a 50lb bag of sand for the test weight thinking I would only use half of it.
I stopped when the bag was empty and I was still able to get a quick, clean release.
I am impressed.
That was a measured total weight of 52lbs hanging on the hook.

I have no intension of flying 52lbs by long line from my Velos.
I just wanted to see what limitation the hook would have in use.
The reality would be that I land the load on the ground first, releasing the tension of the load from the hook, then release the hook from the long line and then land.
It has to be punishing for the servo to pull the pin with that much force against it so I wouldn't do it over and over, but in an emergency, the servo will pull the pin with no issue.

The point of the test was for me to know...now I know.

Here is a shot of my ground test rig as described in an earlier post.


Now on to flight test.
Anyone who has done this, have any pointers?
I would think it would be a good idea to slow the control inputs down in the Skookum.
What about gain?
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