Digital servos and overload

celticveil · Extreme 3D Joined: 04 Mar 2010 Posts: 279

I purchased EXI D113F servos to replace the very weak, even slower dynam 9g servos. Since I am upgrading all the analog servos to digital, is there a chance I could overload the system? The energy specs seemed the same between both models.
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tombo242 · Posted: Tue Nov 22, 2011 8:49 am Post subject:

As long as the servos are are the same power as the originals there should be no problem there. Could be useful to set up a current measuring connector and check servo power draw just to be on the safe side.

Tom.
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solentlife · Posted: Tue Nov 22, 2011 1:54 pm Post subject:

Like all models ... general sport / leisure flying is not a problem and the oft made comment about 4 servos and use a BEC is really not an issue. Not in the small 9gr size anyway. If you were using standard 21 ... 40gr servos as in big models that's a different ball game.

But lets be honest ... unless we are looking to do precision flying and 3D - I for one am not convinced we need digital. There are plenty of fast analogue servos out there with good reputations. the problem is that many kits ARF / RTF are supplied with cheap slower analogues like the Tower Pro SG90 ... I use them and it flies fine ... but I can well see that if I push the model to limits - then I might note their limitations.

My comment is to replace with metal gear servos ... I consider that much more important than digital.
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celticveil · Extreme 3D Joined: 04 Mar 2010 Posts: 279

I highly considered the metal version of this specific servo, but due to earlier comments and wandering along the internet, I decided that until my skill level progresses, it was better to let the servo strip than something else.

Is there anything I need to do to prep my heli for the digital servos? I know the gyro needs to be set to digital mode, but what about anything else? Or do I just plug the cyclic servos in and go?
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solentlife · Posted: Tue Nov 22, 2011 11:39 pm Post subject:

sbobby · Posted: Wed Nov 23, 2011 6:21 am Post subject:

For general flying, I think it is only worthwhile to fit digital servo for tail control.
Digital servos draw a lot of transient current so you got to make sure your ESC have the capacity to supply it.

Here is a good article about analog and digital servos.
http://www.rcrotorz.com.au/showthread.php?592-Digital-servos-amp-BEC-An-article-by-Lucien-Miller

celticveil · Extreme 3D Joined: 04 Mar 2010 Posts: 279

The dynam stock servos are weak and have a 0.3 response time. The EXI are a bit stronger and have a 0.13 response time. The strength and response are what I'm focused on. I can tell tehres a lag when I'm trying to get off the ground...much in the same way old video game systems would lag when you tried to jump, causing you to miss and die.
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Dumb Thumbs · Posted: Wed Nov 23, 2011 10:02 am Post subject:

I'd doubt the laag is from the servos, but more from a weak ESC, motor & battery combo.
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celticveil · Extreme 3D Joined: 04 Mar 2010 Posts: 279

Thats possible, but the servos are a known issue among other e-razor users and are usually one of the first things upgraded on it. I was already ordering a ton of spare parts so I figured to go ahead and get what I could.

EDIT: Installed servos the other day, tested tail tonight as it was the last piece to install. The tail servo warms up and buzzes a lot, other servos are now remaining quiet. This happened with digital servo on analog setting. I reset to digital setting and it continued, no change. Any ideas? Its not binding, already tested that.
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E-Razor 450 + Air Hogs Pocket Copter + Radd's School of Rotary Flight = Teh Awesomness