Yeah, that's sweet. Have you started a build thread?

Not yet. Still too many details being worked out for it to be posted officially.

Yes, this is true. There isn't a specific comparison thread about it, ya gotta read between the threads. LOL

Or just ask.

Both setups use 5000mah 20C 4S Lipo

AXI 2826/8 geared 22/40 - Great little setup. I would have to say the MOST efficient setup I have ran. Usually about 10 extra minutes of runtime than an inrunner setup. This motor will run higher gearing, but temps get "uncomfortable".

Medusa 36-60-2000kv geared 52/18 - Another Great setup. Medusa makes the best inrunners I have ever owned.

It would have been easier to compare the two if I were using an older style feigao 2 pole motor. The gap on efficiency and operating temps would have been large.

When Medusa made this line of motors, they did alot of things right. The 4 pole design is truly superior to the old 2 pole motors. I love my Medusa. A little less runtime than the outrunner, but it makes good power. This setup continues to break driveshafts. :grrrrrr:

On the other hand, the AXI setup would dominate on short track.

Mike's speed calculator shows these two setup like this:

AXI geared for 30.15 mph
Medusa geared for 33.59mph

I GPSed the Medusa setup at 38mph, so these the calculators figures are a little low.

The AXI setup tops out ALOT faster than the Medusa setup. It's quicker "out of the hole". It will yank the front end right at startup, where as the medusa comes into it's real power a little farther off the starting line.

"when sik said "A super low kv inrunner would make ALOT more torque" I thought he mean than an equivalent size/kv outrunner. Now I think I may have misinterpreted his response."

Sorry, I should have said "A super low kv inrunner would make ALOT more torque than it did before." Not to be interpreted that it would make more than the outrunner.

Ok, here's a showcase for you guys. Maybe you will see why I'm excited about Castle's new outrunner line.

First up is where it all began for me and outrunners. The E maxx with an outrunner directly connected to the transmission input shaft. Actually the motor shaft and the input shaft are the same.

http://i160.photobucket.com/albums/t...arWheelies.jpg

Next up, is the Revo Direct Drive to Diff Build. Powered by a custom wound AXI 4130. It kept blowing the bearings on the RCM diffs in about 2 runs. The Ceramic Nitride bearings faired no better. Differential toughness is gonna have to catch up before this setup really works well. Show me an inrunner that explodes diffs like this.

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

Next up is the AXI 2826/8 setup.

http://i160.photobucket.com/albums/t..._Produce_2.jpg

Let's talk about why outrunners have more torque.

A Medusa 36-60's armature is 15mm in diameter and is 35mm long. It has 4 VERY strong magnets, thus making it a 4 pole motor.

An AXI 2826's stator size is 28mm in diameter and is 26mm long. The ID of the magnets inside the rotating endbell is 29mm.

The larger diameter is "easier" to turn because of leverage. This is why there's a knob on the door instead of just a shaft sticking out. LOL

Take a look at my avatar. For each phase shift, there are 4 teeth of the stator energized at any given time.

This means, at any given time, there are 4 magnets in use at any given time. More Magnets, greater force.

Sammus, go on youtube and search 'outrunner stampede'.My setup was MM modded, 4s 5000mah lipo, hextronik 36-48 size outrunner that directly fit into the stock tranny. Motor mount spacing was the same aswell. I could have geared up a ton but didnt have any higher tooth pinions at the time. The motor pulls 850w max. I dont know about you but that outrunner for how small it is puts out a sh!tload of power. Tbest thing was the MM and the lipos were ice cold. The outrunner ran hot , undergeared...

That is a marked difference. Did you get to GPS it with the outrunner in it? The calc figures show the medusa is geared 10% taller, it would be interesting to know how much difference the runtimes etc would be if they were geared a little closer?

Nice results though.

Understood. Before and after ;)

Are you sure it was undergeared? maybe the hobbycity outrunner was just pulling more current than it could handle. At any rate, unless you've directly compared to an inrunner geared to a similar speed, the test results don't mean a lot to me :p Sure looks like a lot of fun though, and is motivating me to experiment. Soon as I get this damn government payout haha. Our stimulus gives nearly everyone in the country about $900 we're encouraged to spend. Sweet, so the missus can't convince me to save this time lol.

I know for a fact that it was undergeared because I was running an even smaller pinion at first and the motor ran very hot, hotter than the biggest pinion I had which was used in that vid. The best part was the runtimes in my opinion. I was getting 30min+ runtimes.

All this talk about torque. In the right circumstances, the torquey motor will be faster than the peak power motor due to area under the curve, but really, aside from RC truck pullers and maybe a crawler here and there, who can even hook up the torque their inrunner setup is dishing out? I love coming up with unique build ideas, but every idea concerning an outrunner has been scrapped quickly after considering the drawbacks. As always, YMMV.

I want to build one for the sand dunes. Powering through soft sand always brings any motor to its knees, my inrunners never rev out as much as they do on dirt or ashphalt. But sand + outrunner doesnt seem good for the motor...

Any motors for the T-Rex 600?
 

Patrick, anything suitable for the T-Rex 600 heli (without having to cut the frame)?

Align 600xl 1650kv.

^ Really??? :grrrrrr: I don't think that's what he meant.........

Its an outrunner in a can. Why not...?:neutral:

hint: this is a thread about Castle outrunners.