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-   -   Direct Drive to Diff E Revo Build (https://www.rc-monster.com/forum/showthread.php?t=8536)

Mod Man 11.10.2007 06:55 PM
I have run that motor in a mostly scratch built truck for over a year now with fantastic results! I am running the 515 KV motor. It will run up to 10S of you feel the need. But, on 10S (heck even on 8S) it has enough torque to break the plastic shafts. You will probably find yourself going to CVDs in no time.

Oh, no cogging worries. That motor is a freakin torque machine!

Matt

aqwut 11.10.2007 06:58 PM
Cool project.. and I do agree with you that less parts the merrier.... I was planning on doing something similar to my GST..

this outrunner... on 12S...
http://www.hobbycity.com/hobbycity/s...idProduct=5139
1.57KG
http://www.hobbycity.com/hobbycity/s.../C80-100-A.jpg
or this one, so I ordered both..
http://www.hobbycity.com/hobbycity/s...idProduct=5140
1.23KG
http://www.hobbycity.com/hobbycity/s...g/C80-85-A.jpg
that's an awesome project.. Keep us posted...

sikeston34m 11.10.2007 07:32 PM
Quote:
Originally Posted by Mod Man (Post 128422)
I have run that motor in a mostly scratch built truck for over a year now with fantastic results! I am running the 515 KV motor. It will run up to 10S of you feel the need. But, on 10S (heck even on 8S) it has enough torque to break the plastic shafts. You will probably find yourself going to CVDs in no time.

Oh, no cogging worries. That motor is a freakin torque machine!

Matt
Got any pictures? What diff gear ratio? Tire size? More input please.

sikeston34m 11.10.2007 07:33 PM
@Aqwut

I've been looking at both of those outrunners more thinking about an Electric Bicycle.....LOL

They are HUGE! How are you going to deal with the 12mm motor shaft or the 10mm motor shaft of the other one?

I'm sure either of those are power houses!

BP-Revo 11.10.2007 07:42 PM
When you see the mounting tabs easily accept M5 or M6 screws...you know its a hell of a motor...

sikeston, looks great thus far. I'm very curious to see how it turns out (vids are a must!).

zeropointbug 11.10.2007 08:10 PM
Wow! Nice work Sike indeed! Congrats on the project progress, I am planning a direct drive outrunner project myself with my other FLM maxx chassis. I was thinking of either a E-flite 'Power' outrunner, or one of the new Scorpian motors.

Aqwut.... OMG, and anything holy! I have never seen that motor before!
That thing must have a 10Kw rating, no doubt?!

sikeston34m 11.10.2007 08:20 PM
It looks like the guy was trying to give it a test spin and broke his thumb! :lol:

I've been checking into the Scorpion outrunners too. The Axi 4130/20 has more torque than the Scorpion 4025 series. 1mm larger stator and the stator is 5mm longer.

However, there is talk about a 4035 series in the future for Scorpion. That would beat the Axi 4030's as long as it's about the same length.

Mod Man 11.10.2007 10:54 PM
2 Attachment(s)
Quote:
Originally Posted by sikeston34m (Post 128431)
Got any pictures? What diff gear ratio? Tire size? More input please.
It is a belt driven (or was untill I put a different power system in it) transfer case running TXT axles.

Matt

sikeston34m 11.10.2007 11:06 PM
Quote:
Originally Posted by Mod Man (Post 128466)
It is a belt driven (or was untill I put a different power system in it) transfer case running TXT axles.

Matt
Nice Machine you have there. :yes:


What battery configuration and ESC were you running?

What kinda top speed were you looking at?

It's ok if it breaks the plastic shafts. Actually, that's a good sign. I want to run about 50mph top end, get there fast, and build it so it doesn't break parts.
I'll be looking at upgrading the diffs, and cvd's for sure.

Mod Man 11.10.2007 11:11 PM
Not sure of the top speed. It is not gear for top speed, though. As a straight axle truck, it does not handle speed well.

Here is alink to another thread with pics of the latest upgrade to it.

Enjoy! http://www.rc-monster.com/forum/show...8&goto=newpost

Matt

lincpimp 11.10.2007 11:13 PM
Quote:
Originally Posted by sikeston34m (Post 128418)
Whatever happened to that Redcat anyways? Do you know what diff gear ratio that it had?

I'm going to start out with a Quark 80amp. To run 40+mph with this setup, I need to spin the motor at 7500rpm. That's going to require 6 Series Lipo. I'll try it on different battery setups. I see myself probably settling on 6S2P A123 packs, but I have alot of other Battery possibilites.

The battery trays that I'm building are rather large to give me plenty of room for ample batteries. The Battery "Area's" will be about 2 1/4" x 2" tall x 7" long. I can easily fit 10S1P A123 in there or a number of other Lipo configurations. I'm looking at other ESC options now though. I want a high voltage car controller that gets along with outrunner motors.
The old redcat is sitting on the shelf. I have the quark 65 in my ls10 running a hacker 13l at the moment on 5s lipo. Not too sure on the diff ratio, but it was 3:1 or 3.25:1, something like that. I ended up using the new traxxas bandit anacondas on hpi wheels to get the gearing right. It was driveable on 4s and ran nicely. I may get some sort of nitro shaft driven on road car and try it out with a mm on 4s. Not sure how the MM will do on an outrunner, but we will see. I may post a thread asking if anyone has a tc they want to let go cheap, maybe a ntc3 or some sort of flat chassis shaft drive vehicle.

sikeston34m 11.10.2007 11:18 PM
Well that's the thing about gearing and cogging. If you pass that "sweet" spot on the way to higher gears, it will cog on start up and the motor will run hot.

The reason why I chose the 305kv motor is, I'm dealing with 2.85:1 diff gears at the moment. More Torque will be required to pull the higher gearing.

The truck will surpass 40 mph with the diff pinion spinning at 7500 rpm's.

It's gonna take 24 volts to do that. I plan on perfecting the setup with no cogging on 6S Lipo or less. The maybe bump it on up.

You have a VERY nice truck there Matt. Congratulations on all that custom work. :yes:

sikeston34m 11.10.2007 11:21 PM
Quote:
Originally Posted by lincpimp (Post 128475)
The old redcat is sitting on the shelf. I have the quark 65 in my ls10 running a hacker 13l at the moment on 5s lipo. Not too sure on the diff ratio, but it was 3:1 or 3.25:1, something like that. I ended up using the new traxxas bandit anacondas on hpi wheels to get the gearing right. It was driveable on 4s and ran nicely. I may get some sort of nitro shaft driven on road car and try it out with a mm on 4s. Not sure how the MM will do on an outrunner, but we will see. I may post a thread asking if anyone has a tc they want to let go cheap, maybe a ntc3 or some sort of flat chassis shaft drive vehicle.

Sorry to pop your bubble Linc, but the MM does NOT like outrunners at all. It has something to do with their software OR their switching rate. You can try it, but it won't work. Cogging.........Cogging.......confusion..........C ogging........Thermal shut down was my experience.

It appears to me that the Kontronik line of controllers work well with the outrunners. Judging from what I've read and seen in the forums.

BrianG 11.10.2007 11:22 PM
Isn't there some kind of rule-of-thumb that states the motor has to spin a certain minimum percentage of its kv rating for the ESC to get the proper back-EMF pulses? Don't know if the same rules apply to outrunners, but it may be something to think about as far as cogging is concerned.

And HOLY COW that's a big motor! You plan to sit on your vehicle while you drive it? :smile:

squeeforever 11.10.2007 11:25 PM
I think the MM will work with some, but not all outrunners. If I remember correctly, Serum posted a video of his G2R with a MM and outrunner and it didn't cog whatsoever.


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