egrave1

which is the better way to go between a 420 kv motor @14.4 or a 670kv motor @14.4

TLH101

My Feedback: (90)

What size motors? What size plane? What size prop? Depends on all those factors.

egrave1

The motor would replace a .46 glow

aymodeler

My Feedback: (3)

It still depends on a number of variables, but in general, higher Kv equals higher RPM (sort of like a higher gear in your car). If you are spinning a smaller prop with a lower pitch, then a higher Kv may be better. If you have a bigger prop with higher pitch, then a lower Kv may be better.

So, it goes back to what size prop, what size plane, and how it will be flown.

whitecrest

WeboCalc can help answer questions like this. Just enter your plane's vital statistics (wingspan, wing area, likely AUW, and projected flying style) to calculate needed input power and a useful range of props, Kv and gear ratios.

4*60

My Feedback: (41)

If using a similar prop pitch/diam. to the .46 then the 670 might be the way to go as 14x670 = 8000+ similar to .46