Motor Timing questions - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-02-2012, 09:50 AM   #1
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Motor Timing questions

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I recently received a new 70mm EDF unit from HK which is rated to 1900W / 76A and noticed a significant difference in measured power when changing timing settings.
I have a Turnigy AE-80A that has 8 Timing settings from 0deg to 26.25 with default at 15 deg.
When setting up to the default maximum power it is 1550W and when increasing the timing to the highest it goes to 1775W with a pick of 78A.
Can someone explain the difference?
Am I risking something in the system if I run it an the highest timing setting?

-I could not find any details about the motor but my understanding is that it is an RC-Lander and based on their website is named B2960/2200kv
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Old 12-02-2012, 06:51 PM   #2
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Re: Motor Timing questions

Higher timing = more power,
More power= more heat
More heat= higher draw on batteries
Higher draw = shortened flight times
Set the lowest setting that will run without sync issues.
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Old 12-04-2012, 05:11 PM   #3
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Re: Motor Timing questions

Hmmmm this is the same as lowering the throttle.
I know more power generates more heat etc.
The question is how does the trimming effect the power and if there is a problem using high trimming.
Reducing the power is not really a solution
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Old 12-08-2012, 01:36 AM   #4
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Re: Motor Timing questions

With every power setup there will be a sweet spot... the extra wattage you see might or might not be translating into usable power... it might be strictly becoming a loss... or worse, the higher timing might be creating a usable power loss and a heat gain...

the best measurement with an edf has to include a thrust measurement (rpm works but is not as revealing)... I have played with this and the results are sometimes staggering... one test i did with a small hyperflow fan showed that a monster 5400kva outrunner setup used twice the watts/pound of thrust that a smaller inrunner did... it did make more power but at a real loss in efficiency..

its all a ballancing act, watts/thrust will give a better idea of whats happening.. if you can't measure thrust then try watts/rpm... you will see a point where increased input means little added output.. just heat... then you are well past the happy spot.. and always watch temps... timing will effect motor heat as you know..

hope his helps a bit..

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