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Old 12-07-2018, 07:17 PM
homo ludens modelisticus
ron_van_sommeren's Avatar
Join Date: Jul 2005
Location: near Nijmegen, Nederland
Posts: 1,144

Kv has a huuuuge effect on current and power drawn. Bigly.

Motorcurrent is proportional to pitch¹, voltage², Kv³ and diameter⁴.
Power-drawn is proportional to pitch¹, voltage³, Kv³ and diameter⁴.

Without the exponentation
extra current with one or two cells added, simple table

So, changes in setup (and lousy Kv specifications!) can have surprisingly considerable/huge effects.
E.g. doubling voltage will four(2²)fold current, doubling Kv will eight(2³)fold current, and doubling prop diameter will sixteen(2⁴)fold current.
Even a small 10% change/difference in Kv will already lead to a 30% difference in current.

Last edited by ron_van_sommeren; 06-14-2019 at 01:22 AM.
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