Upcoming Castle Outrunner Motors - Page 6 - RC-Monster Forums

MetalMan · 03.19.2009, 04:04 PM

Quote:

Originally Posted by SunnyHouTX

Thanks for the info DLSII and MetalMan. Looks like I will have to keep running inrunners for the time being.

If the CC outrunners are as good as Patrick says they are, it may be worth switching over to them. But since we don't have any info. on them or samples to try out, we can't be sure.

SunnyHouTX · 03.19.2009, 04:34 PM

Exactly. I'm gonna bide my time. My truggy is doing well on 6S and a 36-70-2000 Medusa so I won't be hurting too bad...

sikeston34m · 03.19.2009, 06:04 PM

Quote:

Originally Posted by MetalMan

If the CC outrunners are as good as Patrick says they are, it may be worth switching over to them. But since we don't have any info. on them or samples to try out, we can't be sure.

#5 needs more input!

Sammus · 03.19.2009, 10:24 PM

So what's the advantage of outrunners? It's been said a few times that for their size theyre not as powerful as inrunners... it cant be the kv because you could just wind up an in runner to get super low kv... so what is it then? are they somehow heaps more efficent or something?

Why do people love running them in cars so much? IT seems lik inrunners are much better suited.

rotary rocket · 03.19.2009, 11:09 PM

It seems to me that if outrunners have a lot of torque you could use it to your advantage and get rid of the center diff. This would save weight and should result in a more efficient overall drive line.

Of course you would pick a much lower RPM motor and you wouldn't have much flexibility in changing your speed if you use it in place of the center diff.

CC, would you be able to make your motors such that the center shaft is sticking out of both ends?

MetalMan · 03.19.2009, 11:26 PM

Quote:

Originally Posted by Sammus

So what's the advantage of outrunners? It's been said a few times that for their size theyre not as powerful as inrunners... it cant be the kv because you could just wind up an in runner to get super low kv... so what is it then? are they somehow heaps more efficent or something?

Why do people love running them in cars so much? IT seems lik inrunners are much better suited.

rr did a pretty good job of summing up why the average outrunner user would choose an outrunner over an inrunner.

For me, it's also the uniqueness factor. TBH, I have this weird drive the almost forces me to do things differently. Just as an example, I am presently working on a belt-drive conversion of a truggy... that also will use an outrunner most likely.

Sammus · 03.20.2009, 03:38 AM

But more torque isn't a reason, if you wound an inrunner to have the same super low kv as an ourtunner, it would also have huge amounts of torque. Thus I can only imagine it's to do with the efficiency of the motor...

sikeston34m · 03.20.2009, 06:58 AM

Quote:

Originally Posted by Sammus

But more torque isn't a reason, if you wound an inrunner to have the same super low kv as an ourtunner, it would also have huge amounts of torque. Thus I can only imagine it's to do with the efficiency of the motor...

A super low kv inrunner would make ALOT more torque. But you also have to consider the pole count.

Most outrunners are 12 pole motors.

The inrunner would also need a larger diameter armature to match the torque of the outrunner.

RC-Monster Mike · 03.20.2009, 08:20 AM

As a general rule, as the motors pole count goes up, the "efficiency window" gets smaller. Most out runners have high pole counts, which means there "sweet spot" for ideal operation is significantly smaller than the 2pole and 4 pole motors typically used. They are great in aircraft - high torque and a much lower degree of varying power. Cars/trucks are usually run throughout a wider and more variable range of throttle input, so they are best served with a wide efficiency window. A good outrunner is quite efficient when used in its intended range.

Sammus · 03.20.2009, 08:23 AM

Cool, so I've been convinced that outrunners aren't worth running in cars, as I originally suspected :p

Metallover · 03.20.2009, 08:32 AM

No, you can't just say that. They work great in cars. I have an outrunner. It's efficient as anything. It's pretty quick too.

Sammus · 08:37 AM

What, I can't say that I've been convinced they're not worth running in cars?

I can say I'm convinced of whatever I want, thanks.

And fyi, I never said they wouldnt run well and quick, but it seems like for any outrunner powered car, there's an inrunner that will do a better job (power/efficiency wise, maybe not easy of mounting).

MetalMan · 03.20.2009, 11:28 AM

Yes, you are entitled to your own opinion

. Some of us just like to be different. And while you might not see the benefits as we do, that's fine.

lincpimp · 03.20.2009, 11:35 AM

Quote:

Originally Posted by Sammus

What, I can't say that I've been convinced they're not worth running in cars?

I can say I'm convinced of whatever I want, thanks.

And fyi, I never said they wouldnt run well and quick, but it seems like for any outrunner powered car, there's an inrunner that will do a better job (power/efficiency wise, maybe not easy of mounting).

An outrunner in place of the center diff does have some benefits, but the lack of a slipper and any sort of primary gearing will deter most. I personally think that inrunners, or possibly a hybrid motor, will suit most racing and higher speed cars better.

Now an outrunner in a crawler is much better than an inrunner due to torque. I have a few outrunner crawlers and they are beasts. They are geared low. 10mph max, and only run 3s lipo. Much better than an inrunner, and more power than a brushed motor.

It all depends on what you need.

Takedown · 03.20.2009, 01:20 PM

Heres another pic I shot during the I-Hobby Expo Last year...