My First E-Dune Runner

[mulepic]

There's a lot of first on this build for me. It's my first Redcat, my first 5th scale, and AFAIK the 1st brushless dune runner. I'm hoping I'm wrong on the last one and can get some help. From the initial look of it, the easiest route would be the casle xl2 w/ motor. From my measurements (please confirm) the gears sit on a 8mm shaft and that's the size of castle motor shaft. But I'd still have to build some mounting brackets. Before I go that route I'd like to consider dual 1/8 brushless motors for kicks and grins.


But here is what I have to start with:








And of course I'll be selling this motor so contact me if you want it before I post it for sale to the world:





motor

 

[Guantanamo Joe]

Did you buy that new from redcat? That air filter does not look like any of the ones on my trucks

 

[Guest]

Did you buy that new from redcat? That air filter does not look like any of the ones on my trucks

That's new for Redcat. As they replenish inventory the new ones come in with that filter.

 

[Guest]

There's a lot of first on this build for me. It's my first Redcat, my first 5th scale, and AFAIK the 1st brushless dune runner. I'm hoping I'm wrong on the last one and can get some help. From the initial look of it, the easiest route would be the casle xl2 w/ motor. From my measurements (please confirm) the gears sit on a 8mm shaft and that's the size of castle motor shaft. But I'd still have to build some mounting brackets. Before I go that route I'd like to consider dual 1/8 brushless motors for kicks and grins.But here is what I have to start with:





And of course I'll be selling this motor so contact me if you want it before I post it for sale to the world:



motor

This is going to be a cool build!

 

[mulepic]

That's new for Redcat. As they replenish inventory the new ones come in with that filter.

What did the old ones come with?

 

[mulepic]

If I go the single motor route I think I'm going to follow this build: http://www.rc-monster.com/forum/showthread.php?t=23529 The nice thing is I have metal gears where this build did not.

I just measured. The shaft of the single motor option needs to be 1.5" long. I need to go check the castle motor and others.

 

[Guest]

What did the old ones come with?

A little plastic one with just a front element.

-

 

[Guantanamo Joe]

Is that filter up to par with the HPI one that everyone suggests?

 

[mulepic]

So it looks like the castle 2028 only has a 1.2" shaft length and I cannot get the details on the leopard 5698. My other concern is my gearing is much higher than the gearing used in the brushless conversion link above.

 

[mulepic]

I just manually figured out that my FDR is 8.8:1. I figured this out by counting the number of times the pinion needs to go around to spin the wheels 1 full revolution. That seems really high. So a 750kv motors might be too high for this thing.

 

[Guest]

I just manually figured out that my FDR is 8.8:1. I figured this out by counting the number of times the pinion needs to go around to spin the wheels 1 full revolution. That seems really high. So a 750kv motors might be too high for this thing.

Most of the electric motors are higher reving than the gassers. You can just gear it down on the gear plate, right?

 

[rookie101]

Should be an awesome truck when you get it running, keep the pictures coming!

 

[Guantanamo Joe]

I don't know much about electric AT ALL, so I didnt even know an electric motor would push one of these...

 

[Guest]

Oh yeah.... There's always a bigger motor.

Some of the motors the guys are installing in the XBEs are in the 10hp range.

 

[Guantanamo Joe]

Figure you could take the one from your old dryer... but Im not sure how you would keep the extension cord plugged in ha ha ha

 

[mulepic]

So I was able to increase my FDR to 10:1 by switching the transfer gears (for lack of a better term) from 25->24 to 24->25. So w/ the 780kv castle on 8s that puts my speed at 45mph. That seems a little too fast. On 6s it's 35mph but 6s might draw way too much current.

The other major hurdle is mounting the motor to the existing motor plate. The shaft on the motor is .620" too short. I could bore the bearing hole about .140" deeper before the motor bottoms out but that's still .480" shy. The only thing I can think to do is build a coupling.

 

[Guest]

So I was able to increase my FDR to 10:1 by switching the transfer gears (for lack of a better term) from 25->24 to 24->25. So w/ the 780kv castle on 8s that puts my speed at 45mph. That seems a little too fast. On 6s it's 35mph but 6s might draw way too much current.

45.. Too fast!? No way, unless you plan on just running really tight tracks. 35 is about stock speed for the gasser you just yanked out.

 

[Deluge]

Did you buy that new from redcat? That air filter does not look like any of the ones on my trucks

Just as crappy as the old filter, dude. Lol.

 

[Deluge]

Is that filter up to par with the HPI one that everyone suggests?

Negative. The Baja filter is better.

 

[Deluge]

If I go the single motor route I think I'm going to follow this build: http://www.rc-monster.com/forum/showthread.php?t=23529 The nice thing is I have metal gears where this build did not.I just measured. The shaft of the single motor option needs to be 1.5" long. I need to go check the castle motor and others.

I remember that build! He's a member here, too. Pretty awesome setup.