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Old May 20, 2012, 10:17 AM
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United States, KY, Somerset
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Blade 450 3D "Idle" Issue

Hey all. Not sure if there is a better spot for this and couldn't find good keywords to hone down my search.

I recently purchased a Blade 450 3D on eBay. Everything seems to work okay, but at bottom throttle/pitch stick the thing seems to want to "idle". The throttle curve for the respective flight mode bottoms out at 0%. I'm having to use ~5 clicks worth of trim to keep it from spinning up in this mode. What I find just as interesting is the throttle hold mode is set at -0% at all points and the motor doesn't spin at all (as expected.)

Being that this is electric, is this normal for the B450? Can I fix this somehow? I can't go negative throttle on that flight mode.
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Old May 20, 2012, 10:28 AM
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What do the throttle and pitch curves look like for all modes? What TX are you flying with?
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Old May 20, 2012, 10:42 AM
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I'm using a DX6i.

Throttle Curves
Norm: 0.0, 56.5, 72.5, 72.5, 72.5
Stunt: 72.5, 72.5, 72.5, 72.5, 72.5
Hold: -0.0, -0.0, -0.0, -0.0, -0.0

Pitch Curves
Norm: 45.0, 51.0, 60.0, 73.5, 91.0
Stunt: 0.0, 25.0, 50.0, 75.0, 100.0
Hold: 0.0, 25.0, 50.0, 75.0, 100.0
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Old May 20, 2012, 11:24 AM
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hi ,sounds like you need to do the calibrate esc to thottle range bit
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Old May 20, 2012, 11:28 AM
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Hmm...I hadn't heard of doing that. I'm sure all ESCs are different, too. To the sleuth-mobile!
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Old May 20, 2012, 12:02 PM
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Well that was simple enough!
  1. Full throttle stick
  2. Plug in battery
  3. Wait for beeps
  4. Lower throttle stick
  5. Profit!

Thanks!
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Old May 23, 2012, 10:28 PM
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Well, I just noticed that programming the ESC this way only corrected the problem until power loss. Once I disconnected the battery and plugged it back up again, the problem was evident again. I don't have the heli at the moment, but I'm thinking of trying to rebind it and see if that helps.
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Old May 23, 2012, 10:46 PM
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Try and re-bind and low-stick; let us know how it goes.
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Old May 24, 2012, 08:31 AM
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It looks like re-binding [tentatively] fixed it. I say tentatively because I thought it was fixed before. I suppose I may have accidentally nudge the throttle when I was binding the last time.

Thanks for the responses.
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Old May 24, 2012, 01:06 PM
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/sigh

I re-bound the thing, turned off both the TX and heli, powered on the TX, then powered on the heli. At first, everything worked as expected. I get the thing out to the park, power everything up again, turn off TH, and the damn thing spins-up.
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Old May 25, 2012, 03:42 AM
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The DX6i has an offset between Throttle Hold, and Normal mode. So if you plug in the lipo while in Throttle Hold the esc will see a higher throttle point when you switch to Normal mode. To fix this you can plug in while in Normal Mode. Or go to the monitor screen, and increase the Throttle Hold percentage until the Normal Mode's 0 matches Throttle Holds 0. Should be some where around 17%. If you have anything that can read the receivers signal, like some servo/esc programmers, or an oscilloscope you can get it exact.
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Old May 25, 2012, 02:03 PM
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Quote:
Originally Posted by Roto Rob View Post
The DX6i has an offset between Throttle Hold, and Normal mode. So if you plug in the lipo while in Throttle Hold the esc will see a higher throttle point when you switch to Normal mode. To fix this you can plug in while in Normal Mode. Or go to the monitor screen, and increase the Throttle Hold percentage until the Normal Mode's 0 matches Throttle Holds 0. Should be some where around 17%. If you have anything that can read the receivers signal, like some servo/esc programmers, or an oscilloscope you can get it exact.
Interesting. So I presume this is why they [Horizon Hobby] recommend using 10% throttle on throttle hold. I was wondering about that. I haven't had a chance to try it yet, but I'll be sure to post back when I do.
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Last edited by jktravis; May 25, 2012 at 02:04 PM. Reason: grammar
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Old May 25, 2012, 04:22 PM
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Thanks! Using the monitor to close the gap between throttle hold and normal mode seems to have corrected this issue.
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Last edited by jktravis; May 25, 2012 at 04:33 PM. Reason: correcting non-sensical statements
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Old May 25, 2012, 09:01 PM
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Yes, they recommend 10%. Not all of the transmitters are the same. The early ones are closer to 17%, I think most of the newer ones are around the 10% offset.
This matters mostly when you have an ESC that autodetects low throttle on every startup, and you plug in the helicopter while in Throttle Hold.
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