Amp Draw on servos???
 

Hi All,

I'm getting .10 amps on my flap servos at neutral, when they are deployed in motion a little higher but once they get set i'm getting about .05 amps. Is this Ok? Then when I pull the flaps back to nuetral my amps no longer settle at .10 it's around .14amps. Is there any need to be concerned about these numbers? It's setup on a 1/4.5 Hawk from Fly Eagle Jets and the flaps are pretty big, the servos are Hitec 7955. What kind of amp draws are you guys seeing?

Thanks Again for all the help!

RE: Amp Draw on servos???
 

I think that's fine. Seems consistent with other planes I have..

RE: Amp Draw on servos???
 

Sounds like you have a little load on them in the up position, possibly even the weight of the flaps themselves.

Try reducing the up travel one bit at a time & see if the current goes back down to .05A.
If not, & you can feel some free play in them in the up position then that's as good as you will get it,
adjust the travel back to the original setting.

If the current does drop down you had too much travel.
Even a stiff hinge or a tight ball link or clevis can cause small loads like you have.
I'd have a snoop around at what's causing it but I don't it's a big deal. - John.

RE: Amp Draw on servos???
 

The flaps should be set up so that in the deployed position the servo arms are is in a straight line with the pushrod or as close as you can get it. This will give you the least amount of amp draw and the greatest amount of power in the deployed position. In this position there is no air pressure load on the servo. What you dont want is a 90Deg angle between the servo arm and the push rod, This is the worst position to be in and the servo will draw stall current at this point. The flaps are the worst surface to have this problem with. Other surfaces will not react this way. This one item will bring more planes down if you do not have a bullet proof battery system. To recreate this deploy the flaps and push on them both and check the amp draw with a simulated air pressure. If your batterys will fail it will be in this test.

Another way to look at it is if your flap servo is in the up position 1-2 o'clock and in the deployed position around 9 o'clock the pushrod should extend out the 9 o'clock position to the control horn for a push to deploy or 10-11 o'clock retracted and 3 o'clock deployed the pushrod should still extend out to the 9 o'clock position in the pull to deploy