A new toy for me!

[sikeston34m]

Originally Posted by lincpimp

Hey Sike, your 2826/10 setup looks good. I would say to do with a higher voltage setup, but the stock chassis setup really lends itself to 4s, either 2 larger 2s packs in series, or 2 smaller 4s packs in parallel. I have some ployquest 12c 3600 cells (8 of them) and as long as they fit I will make up a pair of 3600 4s packs. It will be nice to have a sturdy tranny and slipper! Lets see how this proposed setup works and I may have to give it a try!

Any idea what you think average and max current draw with this motor would be? Mainly cause I have a mgm 90amp 4 cell esc that needs a home, and the mgm escs will run an outrunner IIRC.

Soon, I will have a quantity of Lipo packs made from 5000mah 20C cells that have the 45mm x 145mm footprint. I plan on keeping 2 - 2S packs and 2 - 3S packs.

They will all fit the stock battery compartment.

This will allow me to run 4S, 5S, or 6S configurations. Motor temps will show me the way. I might play around with this. I believe optional battery hold downs are going to be available for this to allow for larger packs. Have you heard anything on this?

Your battery setup should work well. 86 amps continous and 7200mah should make for some nice runtime.

About the amp draw, I'm not sure on this one yet. Actually, you have a better idea of how the 2826 performs with the Redcat. Tell me, how does it do? How many watts do you think it's capable of? You don't have the cooler though right? Here's this same setup with your AXI motor. It would perform pretty good too IMO. Using a motor of less kv, just means it's going to accelerate that much harder.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.16
Other Ratio: 1
Spur Tooth Count: 40
Pinion Tooth Count: 25
Total Voltage: 14.8
Motor KV: 760
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 1.6 : 1
Total Ratio: 5.28246 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 11248 RPM
Vehicle Speed: 36.42 MPH (58.51km/h)
Effective Speed Rate: 2.46mph/V (3.95kmh/V)
Effective KV Value: 760

It's tricky business with Direct Drive trying to match the "power band" of the motor to the diff gearing and tire size.

I'm really excited about this setup because we have the gearing to work with to keep the motor in that "sweet spot".

[lincpimp]

Actually, the redcat setup can't be pulling many amps, my battery is a 2500mah 18c 5s pack and it did not even get warm. The redcat is much lighter than an emaxx, but the final gearing (inc tires) will be very similar (slightly lower in the emaxx) so we will see how it does. Wondering if the 4120 would be a better motor? You have more outrunner experience than I so I will see how your experiments go. I will say that maybe 5s will be better with my lower kv motor. Seems to be the general feeling that lower kv and higher voltage yields better results. I do have the cooler now, just need to put it on!

Here is what I feel would be the best setup for my motor, but will need to be tested.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.16
Spur Tooth Count: 40
Pinion Tooth Count: 20
Total Voltage: 18.5
Motor KV: 760
Tire Diameter (inches): 5.75
Spur/Pinion Ratio: 2 : 1
Total Ratio: 6.60308 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 14060 RPM
Vehicle Speed: 36.42 MPH (58.51km/h)

Maybe put a 22t pinion on it, and aim for around 40mph. Using a 2 speed will allow for higher gearing and top speed, and motor rpms look good too, it may work!

[sikeston34m]

Originally Posted by lincpimp

Actually, the redcat setup can't be pulling many amps, my battery is a 2500mah 18c 5s pack and it did not even get warm. The redcat is much lighter than an emaxx, but the final gearing (inc tires) will be very similar (slightly lower in the emaxx) so we will see how it does. Wondering if the 4120 would be a better motor? You have more outrunner experience than I so I will see how your experiments go. I will say that maybe 5s will be better with my lower kv motor. Seems to be the general feeling that lower kv and higher voltage yields better results. I do have the cooler now, just need to put it on!

Here is what I feel would be the best setup for my motor, but will need to be tested.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.16
Spur Tooth Count: 40
Pinion Tooth Count: 20
Total Voltage: 18.5
Motor KV: 760
Tire Diameter (inches): 5.75
Spur/Pinion Ratio: 2 : 1
Total Ratio: 6.60308 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 14060 RPM
Vehicle Speed: 36.42 MPH (58.51km/h)

Maybe put a 22t pinion on it, and aim for around 40mph. Using a 2 speed will allow for higher gearing and top speed, and motor rpms look good too, it may work!

The 4120 is too fat. To get this mesh using the mod1 gears, the motor is going to be pulled down really close to the transmission. I'll take a look at possible mounts with the 4120.

The 4120 would make LOTS more torque than the 2826, but I don't think we'll be coming up short in the torque department.

It takes a really big outrunner that's loaded with gearing to pull big amps I think. I had some separation on the 80 amp Quark between the sticky and the heatsinking case. I believe that's why it was thermaling running the 4120 in the Direct Drive Revo.

With the Revo, we're talking an even heavier truck (about 11 pounds), plus some really tall gearing to pull.

The only thing I've ran so far in the Revo has been 10C packs. Think about that. But this does give me a better idea of how many amps the Revo is pulling.

The two cell types that I've ran the revo on are:

4000mah 10C(15C) 40 amps continous 60 amps Burst
5000mah 10C(15C) 50 amps continous 75 amps Burst

With the 5000mah packs, it worked GREAT. I could hardly tell the packs were warm at all.

With the 4000mah packs, I could tell I was pushing them. The 4S worked good, but I could tell voltage drop under the load was greater. They didn't have the punch the 5000's did. When I put it on 6S with the 4000's, They got pretty warm. I could tell this was a bit too much for them to handle.

The 4000's work well in the E maxx, but it's a lighter truck with a smaller motor. The Direct Drive to Tranny setup in the E maxx draws less than 40 amps continously, and that's a 3530 outrunner.

I believe the outrunners to be very effecient in their use of power and this helps keep the amp draw to a minimum.

The 20C packs should be GREAT compared to what I've been used to running.

"Psssst.......I've got 2 more of the New E maxx's on the way. I think I'll part them out and put them on Ebay"

[lincpimp]

Originally Posted by sikeston34m

With the 4000mah packs, I could tell I was pushing them. The 4S worked good, but I could tell voltage drop under the load was greater. They didn't have the punch the 5000's did. When I put it on 6S with the 4000's, They got pretty warm. I could tell this was a bit too much for them to handle.

The 4000's work well in the E maxx, but it's a lighter truck with a smaller motor. The Direct Drive to Tranny setup in the E maxx draws less than 40 amps continously, and that's a 3530 outrunner.

I believe the outrunners to be very effecient in their use of power and this helps keep the amp draw to a minimum.

The 20C packs should be GREAT compared to what I've been used to running.

"Psssst.......I've got 2 more of the New E maxx's on the way. I think I'll part them out and put them on Ebay"

Yeah, you may be the first to part out a new emaxx. My lhs has about 6 of them, but my funds are tied up at the moment. I have quite a few things to sell, but am going to wait until after new years. According to your findings the emaxx motor must be drawing somewhere around 40-45 amps , probably less than that on average, but enought to give a 40amp rated pack a workout!

[sikeston34m]

OK, I got all the parts on the way now except for the 2 speed kit for the transmission.

Know any website that has that in stock?

[lincpimp]

It does not appear that anyone has info for it yet. Tower shows it to be in stock mid january, so I guess we have to wait.

[sikeston34m]

Take a look at these gears!

This is RCM's 25 tooth Mod 1 gear and a 38 tooth Revo spur. Do ya set this mesh with a piece of paper just like the 32 pitch gears?

Thanks Mike! Quick Shipping!

[lincpimp]

I generally set the mesh with mod1 gears by feel. They can tolerate more gap than 32p can. I just get them together tight and then back it off until it feels smooth when they rotate.

[Patrick]

Yeah I usually set them by feel as well, even the 32p gears and the mini-t gears, whatever pitch they are. It seems to work because I've never stripped a spur.

[sikeston34m]

I don't know what you have in your tool box, but if you're always taking em apart and putting em together like me. Then let me suggest, you need one of these.

I cut the bend off some allen wrenches. The chuck on this locks when it's not under power. Just break em loose and run em on out. When tightening just let off when you feel the end is near, then put the final twist on with the grip. It works good and REALLY speeds things up. Just thought I would pass this along.

Oh to match the thread, I used this on my E maxx.

[sikeston34m]

We've got gears!

This is RCM's 25 tooth mod 1 pinion mated to a 40 tooth Revo spur.

I haven't got to try it yet, but it's looking pretty promising.

[lincpimp]

Looks good Sike, how much smaller pinions could you fit before the motor makes contact with the tranny?

[sikeston34m]

You could probably go down to an 18t or a 20t pinion on the 40t spur.

I know the 22t mod 1 pinion I have will work with the 36t spur, but that's just about the limit.

Notice how much adjustment there is left in the motor mount slide?

A setup like this on a Mean lower kv inrunner would be awesome also, for you guys that are looking for tougher ways to gear up.

[lincpimp]

Good to hear, I will try the 2826/12 on 5s with 40/22 gearing. Can't wait for traxxas to bring out the 2 speed tranny.

[sikeston34m]

Hey Linc,

Look what the UPS truck just delivered.