Need new esc advice
11-19-2018, 03:28 PM
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Need new esc advice
Had an extremeflight 2s-3s lipo 25 amp esc that didn't survive a Zagi crash.. Can I replace it with. 2s-3s lips 30 amp esc? Or should I find another 25 amp? Using it on a Astro flight brushless engine and 2200 mah lipos thanks
11-20-2018, 07:08 AM
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30A, 100A, 1000A, 10000A, ..., all ok, apart from the extra mass to drag around.
Controllers don't force feed motors with electrons. Current at full throttle is proportional to pitch¹, voltage², Kv³ and diameter⁴.
Controller does not come into play, it will pass on the current the systems asks, even if it would lead to its fiery deatch.
Without the exponentation
extra current with one or two cells added, simple table
Vriendelijke groeten
Ron
• Without a watt-meter you are in the dark ... until something starts to glow •
• e-flight calculators • watt-meters • diy motor tips • Cumulus MFC •
Controllers don't force feed motors with electrons. Current at full throttle is proportional to pitch¹, voltage², Kv³ and diameter⁴.
Controller does not come into play, it will pass on the current the systems asks, even if it would lead to its fiery deatch.
Without the exponentation
extra current with one or two cells added, simple table
Vriendelijke groeten
Ron• Without a watt-meter you are in the dark ... until something starts to glow •
• e-flight calculators • watt-meters • diy motor tips • Cumulus MFC •
11-20-2018, 07:10 AM
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In fact, it is a good practice to have some headroom built in.
About derating motors, controllers, batteries, electronics in general: Ron
• Without a watt-meter you are in the dark ... until something starts to glow •
• e-flight calculators • watt-meters • diy motor tips • Cumulus MFC •
About derating motors, controllers, batteries, electronics in general:
- Derating, starting at ... Then there is the 75% rule of thumb ...
Questions and Answers.... - Page 928 - RCG - Motorcurrent is proportional to voltage squared, and proportional to Kv cubed.
A 10% change in battery voltage will give a 20% change in current, a 10% change in Kv will give a 30% increase. Not quite, because battery voltage will sag more due to higher current, but you'll get the idea. - extra current with one or two cells added, simple table
A.k.a. "Why did my motor and/or controller and/or battery go up in smoke??? ¨.
In depth discussion
www.theampeer.org/ampeer/ampnov15/ampnov15.htm#ADD - About de-rating controllers and motors, starting at for everyone else:
Questions and Answers.... - Page 290 - RCG
Ron• Without a watt-meter you are in the dark ... until something starts to glow •
• e-flight calculators • watt-meters • diy motor tips • Cumulus MFC •
