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Old Nov 22, 2011, 08:33 AM
Time for me to Fly...
Mr. Wiz's Avatar
United States, MI, Fenton
Joined Jan 2000
8,596 Posts
Paul,

Have you ever figured the load of 4 digital servos trying to hold position? I know, DLGs are very light and don't generally very fast so I wouldn't expect a huge current draw. I'm just curious more than anything. Maybe a good test for me would be to deflect a servo on a spring pull setup and measure the current draw and multiply by 4. Do you think the aileron servos experience much more of a flight load than that?
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Old Nov 22, 2011, 08:46 AM
PLD
Magicsmoke maker
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Australia, QLD, Charters Towers
Joined Dec 2003
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MrWiz,

Actually just working on answering those sorts of questions right now with the PLD-SLOGGER (servo logger). It'd be nice to take the rated/specified "stall" currents and multiple by 4 and be done with it, certainly at least that puts you in to the ballpark.

On launch, I'd say it is the rudder servo that experiences the highest current drain, since it will be fighting the pressure to push it inwards during the spin and release. The ailerons and elevator would be subjected to far lower loads.

Paul.
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Old Nov 22, 2011, 09:21 AM
Time for me to Fly...
Mr. Wiz's Avatar
United States, MI, Fenton
Joined Jan 2000
8,596 Posts
I can't imagine any flight with a DLG where you'd have 4 servos stalled trying to hold position. Now, if we were talking 3D planes maybe. And generally there only because people do a poor job setting up the plane, as in not properly setting the limits of servo throw to match the physical limits of the control surface.
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Old Nov 23, 2011, 09:50 AM
PLD
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Australia, QLD, Charters Towers
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Agreed MrWiz, I'd be shocked if anyone managed do lock up all the servos for any notable period of time on a DLG, which is important, since that is what this product is focused for.

Also, new pictures added for viewing pleasure

Everything is working nicely, a few more days of load testing and such and I'll be putting them to the market.

Paul.
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Old Nov 23, 2011, 02:51 PM
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Nathan Schmoekel's Avatar
USA, MI, Grand Rapids
Joined Apr 2007
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For handlaunch guys the moment of highest amp load would be high speed flap deployment......followed by the rudder during launch.

Either way the load is momentary and if the steady current threshold is a full, honest amp there should be enough overhead.

If your plane honestly "needs" more power than that it's probably not a DLG
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Old Nov 23, 2011, 06:43 PM
PLD
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Australia, QLD, Charters Towers
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Yes, either that or it's in the process of being chewed up by a hungry Tyrannosaurus Rex
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