Brushless disc motors

[mattsdragons]

After a motor to run one of the 2kg discs, I don't have a load of cash to put into a spinner, just after something that will work and who knows, may do some faint damage

Will be running 5s lipo so you get an idea of rating, would this motor below be up to the job?

http://hobbyking.co.uk/hobbyking/sto...arehouse_.html

[Ellis]

Kind of depends on ratio. 1.4kw isn't a huge amount these days, but it should spin it. As it's just 2kg, I'd say a 2:1 reduction or more, perhaps?

[mattsdragons]

If anyone can point me to a better motor at 5s please do hahaha

[Ellis]

These three put out about 1.6kw at 5s: http://www.hobbyking.com/hobbyking/s...tors-50mm.html

But they're all relatively low KV, so for a desired disc speed you may have more power available, but you'd have to use less reduction, and so any torque/power gained is kind of lost again.

That said, any of those motors, even at 1:1, would do the job. Team RCC's Valkiri 2 uses a 50-60 size motor at I believe 4s, pulling some 1400w, to spin a 3kg 40cm disc at only a little over 1:1. Spin up isn't insane, but it most definitely spins up!

[mattsdragons]

Hmmmmm, if I got my hands on some botbitz 85's then I would feel more comfortable about running everything at 6s

[teamshock]

The new Inertia is using one of the NTM motors- they look to do the job quite nicely.

[mattsdragons]

Which one are you running will? Would you mind giving me an idea of the performance etc?

[teamshock]

I'm using the 50-50 version. Not tried it yet as I'm still building.

However I use a smaller 28-26 NTM outrunner on my beetle and that seems to work very nicely.

http://www.youtube.com/watch?v=GUGdzOOMQCc

[mattsdragons]

Point me to a good esc for one of the 50-50's? Hear the red brick 70a esc's are solid?

[Ellis]

Those motors can all pull 90a for short periods of time; a 70a ESC, however solid, will probably fail.

[mattsdragons]

What am I on about! Meant to say the 125a ones, no idea why I said the 70a version hahaha

[teamshock]

I'm using a 200A one. Heard good things about them and should be more than up to the job

[mattsdragons]

Brilliant, got that logged down on my 'To buy' list

[maddox10]

We use the cheaper HK 190/200 Opto in Valkiri2. The motor used is the NTM 50-60 370Kv , fed by a 4S Zippy LiPo.

Needs tweaking, and I'm going to change the ratio a bit, to get a faster and more consistent spinup, let us say 1-1.5