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Startup power setting in ESC

Old 09-17-2019, 09:08 PM
  #1  
sportflyer
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Default Startup power setting in ESC

What is startup power setting in ESC . The Turnigy Plush 32 series ESC programming card has this setting and it ranges from 10% to 45% . Is this related to how fast the ESC responds to throttle changes ? Should I set it up to a mid range value for aerobatic and 3D flying? Tks
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Old 09-17-2019, 10:00 PM
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solentlife
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In terms of throttle response setting ... this means that from ZERO - the response is set at a slow or fast rate of increase.

It is normal to have full rate response for fixed wing and slower rate response for helicopters. Basically in normal mode - it has the heli rotors spooling up at a reasonable rate and not 'jerk' the model. But on a fixed wing machine - you need fast response for aerobatics etc. .... lets put it this way - there's only two times you have zero throttle on a Heli - that's on startup and shut down, but a fixed wing - quite often you will close throttle, but will need instant response when you open back up again !
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Old 09-19-2019, 01:31 AM
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sportflyer
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So I should set it towards the high end for fixed wing aircraft . Tks
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Old 09-19-2019, 09:57 AM
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solentlife
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Originally Posted by sportflyer View Post
So I should set it towards the high end for fixed wing aircraft . Tks
Basically set it for fastest response .... you do not want any delay in motor acceleration.
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Old 09-19-2019, 05:13 PM
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quorneng
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sportflyer
The reason for a throttle response curve is more of a safety feature than a necessity. An electric motor will produce a torque then is more or less proportional to the throttle position regardless of the speed the motor is actually rotating.
In a helicopter you have a huge diameter relatively heavy rotor and the motor is geared to drive it. Apply full throttle and the motor will apply full torque instantly. The rotor hub will not be able to handle the sudden torque likely damaging the rotor blades or even twisting them off. An expensive and potentially dangerous situation. A conventional propeller is by comparison both smaller diameter and much more heavily built so can withstand the instant full power torque, although 'snap' opening full throttle from static is not to be recommended.
Of course you can overcome the problem on a helicopter by opening the throttle suitably slowly from static but you are then relying on the pilot to remember to do so.
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Old 09-19-2019, 06:19 PM
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ron_van_sommeren
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Originally Posted by solentlife View Post
... Basically in normal mode - it has the heli rotors spooling up at a reasonable rate and not 'jerk' the model. ...
And it keeps current in bounds during rotor speed up.

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Old 09-19-2019, 07:01 PM
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What often happens with an ESC with fast throttle response on a Heli - is the Heli can do a wild pirouette into a mangled mess or if lucky and you shut throttle quick enough - it tries to spin opposite to the blade rotation ..... you may be lucky to stop it tripping over !
The inertia of those blades is something else !!
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