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Low KV high torque motors

#1
I have a motor that has a relatively low KV/RPM but has a really high torque.
Question:
What kind of prop should I use for maximum thrust?
Are larger and pitchier peops better for this motor?
 

FDS

Well-known member
#2
Yes, larger props work best on low Kv motors. Choice of prop depends on plane weight and the desired flight characteristics.
 

DamoRC

Well-known member
Mentor
#3
I have a motor that has a relatively low KV/RPM but has a really high torque.
Question:
What kind of prop should I use for maximum thrust?
Are larger and pitchier peops better for this motor?
Larger diameter - yes.

Higher pitch - no - depending on your specific motor battery plane combination.

Speaking of specifics - can you provide some?:)
 
#4
Larger diameter - yes.

Higher pitch - no - depending on your specific motor battery plane combination.

Speaking of specifics - can you provide some?:)
I have a brushed motor lying around that I didn't want to throw out, so I thought I might use it for a plane

The motor is rated at 1.5-9V, so I'm going to power it using a 2 cell lipo battery. It can only produce 7400RPM, but a lot of torque. I want it on a plane flying wind, for which I would prefer low-speed, efficient thrust rather than outright speed. I guess I should go with a lower pitch prop?
 

DamoRC

Well-known member
Mentor
#8
These are low power units, a few watts max I would guess based on specs of similar sized motors. Being generous and assuming 5 watts, with 50 watts per pound being the lowest power to weight for flight, your plane could be no heavier 2 ounces. The motor itself is approx half an ounce.

Not saying it couldn't be done , it's just gonna need to be really light. Also will probably have to use a gearbox to get a small prop to spin fast enough.