Quadcopter motor Traxxis big block 3.5 hp electric motor

jdolecki

Was reading my Car and Driver artical on this 100mph traxxis RC car and thought these would be good for a quad copter

Pushing it to these extremes is a 1,650 Kv Traxxas Big Block Brushless electric motor, powered by two rechargeable 3-cell, 5,000 mAh lithium-polymer battery packs.

The article said 3.5 hp for the motor

http://traxxas.com/products/models/electric/6407xo1

Mark_T

Kv=1650 is way too high for a copter at that power level - more power means longer prop blades, higher battery voltage = lower rpm and Kv (which more-or-less requires outrunner geometry to get enough magnet poles). Also for aircraft use a standard open-frame air-cooled motor is needed. Check out a nice high power moto of this class: http://www.aero-model.com/Hacker-Brushless-A200-8.aspx Kv=110

prof_braino

Obviously using these might be a little crazy for a regular design; But if one wanted a heavy lift helicopter

http://en.wikipedia.org/wiki/Mil_Mi-26#Specifications_.28Mi-26.29

Maybe long blades and slower(ish) rotation would work. The guys from MadLabs had a photography rig they said could fly something like 30 pounds for 7 minutes, I started thinking about more blades, and increasing length. Of course, maneuverability decreases, but for applications like photography increased stability is more desirable.

LoopyByteloose

Golden Motor has some extremely big brushless motors. 20Kwatt (peak), 10Kwatt rated

http://www.goldenmotor.com/

Publison

Quadcopter with four of these, (20 HP each):

http://www.hobbyking.com/hobbycity/store/__14427__Turnigy_CA120_70_Brushless_Outrunner_100cc_eq_.html

That's some lifting capability! Craft would have to be four feet in diameter to handle the props.

Mark_T

Publison wrote: »

Quadcopter with four of these, (20 HP each):

http://www.hobbyking.com/hobbycity/store/__14427__Turnigy_CA120_70_Brushless_Outrunner_100cc_eq_.html

That's some lifting capability! Craft would have to be four feet in diameter to handle the props.

I think there's a misprint in the spec - 4.8ohm should be 4.8 milliohm!!!

4 of those would, erm, "pull quite hard"... No load current of 11A says it all! I'll see you and raise to 20kW: motor at http://www.youtube.com/watch?v=PXI5d0Aws0Y

jdolecki

I didn't know there were already motors that size or bigger.

Heater.

Some how I find the idea of 16 horse powers worth of motors spining four exposed blades whilst traveling at high speed at low altitude under the control of any kind of software just a little bit terrifying.

I'm not sure I know of any place within reasonable distance of civilization where I would confidently fly such a thing without worrying about liquidizing somebody.