Outrunner info?? - RC-Monster Forums

captain harlock · 11.30.2006, 06:23 PM

Huh????

danverz · 11.30.2006, 06:36 PM

Hi,
you can reach much more rpm also with outrunners:
I had a Cyclon brushless one capable of 5500 kv/volt and I ran it with lipo 2s.

Everything depends by the motor design. They probably shown you some motor
to run propellers directly to the shaft of the motor without reductions.

I think you should understand how many rpm you need looking for the car gearing.
If you suppose you need to reach 50 mph, you simply will find the right rpm
using your speed formula "inverted" (difficult to say in english for me, I hope this
stay understandable).

When you will have understood the right rpm, you will choose the right motor design.

BTW have a look to the Cyclon ones, I think they are really good motors.
www.cyclonbrushless.com

Ciao,
Daniele

jhautz · 06:55 PM

From what I understand most outrunners have a relatively low rpm limit because of the amount of mass they are turning. Also, I think most outrunners are much higher pole counts. Like 10, 12 or more poles. This may also have something to do with the extra tourque.

Its actually funny that you say this. I just ordered (ordered on Monday)an ourunner I am planning on testing in a BL Cen Matrix project I am starting.

There is actually a company that makes outrunners specifically designed for car and truck applications.

www.cyclonbrushless.com

I have been wondering about these motors for quite a while but I havent found ANYONE that has tryed them yet. So, I decided that this would be a good place to test it. They are a little diferent than your typical outrunner. They are supposed to be good up to 40K rpm. I'll let you know what happens. Although its probably going to be while since I am lieterally just starting and this is going to be my ''winter'' project. I am going to use the Cyclon Car 2000 (2093kv) motor on 5s (if your gonna test it why not push it right to the limit :018: ) with the Quark 125 set to ''outrunner'' mode. Its the only car controller I have ever seen with a setting for outrunner mode.

My thought was I could go with a lighter motor and get just as much/more torque out of it cuz its an outrunner. We'll see I guess...

BrianG · 11.30.2006, 07:15 PM

Captain: What do you mean by "huh"?

danverz: Thanks. I understand how to figure out the rpms using all the reductions, etc. I just don't know enough about outrunners to know what the "guidelines" are.

jhautz: Yeah, I also knew about the high pole counts and the rpm limit dues to the mass makes sense. Since the weight is so far out, it would also act as a flywheel of sorts as well. I wonder what kind of effect that would have. Those cyclone motors look nice. I guess I'll let you be the guinea pig - it's better on my wallet! :)

Gotta be careful with the Quark programming though:

Quote:

Note: Please select Out-runner type if an In-runner has 6 poles or above. Also, please select In-runner when using an out-runner with less than 600kv.

So I guess it depends on the poles and/or kv value...

I like the fact that these motors are physically shorter and the lower kv allows me to eliminate the tranny/spur/pinion, which do have some losses. Not to mention it would eliminate any possible weak spots in those areas.

jhautz · 11.30.2006, 07:40 PM

A direct drive like you are thinking would be pretty cool. You would only need around 3500 RPM to get 60 MPH on a max size wheel. A 240kv ourtunner on 4s would get you over 60 mph. The question is.... Can you really get that much torque out of one motor. :002:

What about getting 2 of them and setting it up on a pair of tank tracks and just use motor speed to steer as well as drive.:p

captain harlock · 11.30.2006, 09:41 PM

[QUOTE=BrianG]Captain: What do you mean by "huh"?

Nothing.
I'm quite very simple when it comes to these sort of topics. You talk alot of science:032: and I'm frankly not that type of guy who would dig deep into things like that. I really dont understand many of the terminologies used in this hobby and specifically what regards brushless and all.

Haha! I was only joking when I said "huh?", though.:p

Do not take me wrong.:)

BrianG · 11.30.2006, 09:45 PM

Lol, that's OK. It's just that the statement was a little open-ended and was wondering specifically what the confusion was about. :)

zeropointbug · 12.01.2006, 01:50 AM

The E-Flite has a 6mm shaft that is reversible BrianG, so you can take it out and put in a longer one for 4wd if you ever wanted to. Or to simply flip the motor around...