Outrunner Emaxx
 

Hi, I have an Emaxx. I was looking at converting it to brushless. I already have an outrunner equipped MP6(converted to road) and a TC. My LHS has 2 Rimfire outrunners on hand,a 50-65-450 and 50-65-300. Are these big enough for an Emaxx? I would be replacing the trans and driving off both ends of the motor. Thanks, Don

Hi Don,

Interesting subject.

Either of those outrunners might work, depending on what voltage you intend to run them at.

What I wanna know is..........How are you going to fit either of those between the frame rails?

Custom Chassis maybe?

Please post more info about your build.

How are you going to address startup issues when so high geared? Smaller tires maybe?

The width between the frame rails is 45mm. The diameter of the motor is 50mm. If I machine the inside of the frame rails 5mm on either side it should fit. I'll have to have a custom mount made. I was hoping it would have enough torque to overcome startup issues? I was looking at the 50-65-450 running 6s A123 with a MMM. Don

FYI sikeston has a lot of knowledge and experience in this area. I know he won't toot his own horn so I will for him. I would gather as much info from him as you can.

I agree. The diff ratio is 5.22. The tires are 149mm diameter. Don

Uh oh............Now I'm in trouble. LOL

I once did a Direct Drive to Diff E Revo. Here's the thread on it. A long read, but you will see the challenges I faced.

http://www.rc-monster.com/forum/show...outrunner+Revo

With Direct Drive using such a large Diff ratio has it's problems. I also tried the 10/43 Buggy gears for the Revo, and they wouldn't hold up. The Torque was too much for the diffs to handle.

The E maxx has the same gear ratio as the Revo. :yes:

I can see in the future, a working outrunner project, but this is waiting on Castle HV Line of Mamba Controllers.

A low kv outrunner on HV, would startup great and haul butt with top speed.

Anticipation. LOL

Thanks for the compliment TexasSP. I try to help when I can. :yes:

Before the Direct Drive to Diff Revo, was this E maxx.

http://i160.photobucket.com/albums/t...m/DSC06244.jpg

It's outrunner motor was attached straight to the Tranny.

It ran like:

http://i160.photobucket.com/albums/t...lie2ndGear.jpg

The e maxx motor was a TowerPro 3520 660kv motor. It performed well.

I love outrunners and how they work, but the truth is............For gearing, there is a sweet spot you want to find.

Too high on the gearing, it will cog on startup and run hot. All the while, exploding diffs and shredding your drivetrain.

Too low on the gearing, and it's like having a low geared diesel. LOL

I like the fact that Castle is perfecting the "Torque Limiting" feature for their ESCS. If this is perfected by the time the HV Mamba controllers hit the market, Bingo! That's gonna be a class act for some outrunner setups.

I guess I'll have to wait then. The LHS has the Rimfire 50-65-450 for $70. I used a Rimfire 42-60-600 in a direct drive road conversion MP6. On 6s A123 it smokes all 4 tires. I also converted an Exceed 1/10 shaft drive TC with a Rimfire 35-36-1000. On 4s A123 it also runs very good. Budget considerations mean I have to get it right the first time. Don

I've been pretty impressed with the outrunners on my airplanes. They stay ice cold and I push them pretty hard too. How about keeping the trans and bolting an outrunner at 6 or 8S or greater with the new HV speed controllers coming out. That might be the ticket to some wicked power.

I still have my emaxx. I like what sikeston34m did on his old emaxx.(post #8) This looks to be a better option than an outrunner by itself. It looks as though you mounted the motor where the spur gear shaft was? I was looking at doing the same thing with mine. I have the newer e maxx(3905). The overall gear ratio would be 5.22. I'm using stock diameter tires. System voltage is 13.2( 4s A123). I can go 6s if needed. I was looking at using a Rimfire .46(800kv). If I mount the motor to the front of the trans. will it upset the front to rear balance to much? It looks as if I can flip the trans 180 degrees if necessary. Thanks, Don