I got bored. Twin Motor 12-Cell Traxxas 4-Tec.

[rccardude04]

Right side. See both pinions?
http://members.cox.net/rccardude04/Right%20side%20without%20body.JPG
Left side. You can clearly see both motors and my nifty throttle servo/microswitch setup.
http://members.cox.net/rccardude04/Left%20side%20without%20body.JPG
Right front corner. Isn't it purrdyy? hehe
http://members.cox.net/rccardude04/Right%20front%20corner%20without%20body.JPG
And finally, for safety, I had to have a throttle return spring. And since it's super late and didn't have an extra TRS, I got innovative and came up with this slightly more solid and cleaner looking alternative. Tell me what you think.
http://members.cox.net/rccardude04/Worlds%20coolest%20TRS.JPG
Just trying it out down here, I held the shock tower and yanked the throttle. The car proceeded to pull my hand about a foot across the floor and leave some rather respectable black marks on the ground. But the belt didn't slip and the gear didn't strip! So it shoudl hold up. Hopefully, lol. I should get to run it later today (considering it's 2:00AM right now). I'll be sure to report how it goes!
BTW, I know about the tires. I'm cheap, and the rear pair was donated. They're in much better shape than my old rears, so I put them on. So please don't give me crap! ty :p
-Eric

[pimpride]

That's pretty cool Eric. How did you manage doing that? (Wait for the response: Very carefully). Oh BTW everybody Eric is taking this beast out to one of the running tracks at a high school or something like that.

[KTRTS]

Err, why are there 2 pinions, but only one spur. Would this damage it since the 2 motors wont run excactly the same? :confused:

[TheLaxPlayer]

That's the way the E-Maxx works. How would you do it with two spur gears?

[mr_pushrod]

Microswitch? So on/off throttle? Should make for a fun drive, lol.

[pimpride]

Yea I was trying to imagine that....

[KTRTS]

That's the way the E-Maxx works. How would you do it with two spur gears?

Left and righ drive. Won't both motors be going in the asme direction. Or is one running the other way round?

[pimpride]

I believe he has the positive and negative motors switched on one of the motors.

[trw]

no, if you think logically if one was running backwards THEN you would be destroying your spur, if they both run in the same direction then you will have a working system.

cause see, lets say both motors are rotating counter clockwise, on the top motor the spur is touching the bottom side of the pinion, which means the pinion is spinning the spur clockwise.

the bottom motor has the spur touching the top portion of the pinion, that means that that pinion will also be moving the spur clockwise, therefore making the spur turn clockwise without any trouble.

if you had one motor turning clockwise and the other counterclockwise then you'd have two motors trying to turn the spur two different ways.

[trw]

cause see heres, heres a visual aid

[GramdeGixxer]

well tell us how it ran.

[tec_41]

Wow, thats pretty innovative. Do you have upgraded differentials? Cuz its more than likely that the stock ones would rip apart :p

[Krasi_5000]

looks very interesting. So its basically a dragster since its only on/off that should be fun to drive! Let us know how it works out!

[rccardude04]

KTRTS: if one motor is stronger than another motor, the stronger motor will have more of the load that it has to carry. Therefore, the weaker motor won't have as much of a load and it'll run the same rpm. It works. Don't worry :)
mr_pushrod: Yes, it is microswitch and I found myself forgetting that there are no brakes and managed to run into my buddy's foot. lol.
trw: exactly :)
pimpride: no I didn't switch the motors. trw explained it well enough.
tec_41: a loonnggggg time ago I tried to tighten the rear diff and managed to strip the adjustment screw, so the rear diff is JB welded together. So I have essentially a really heavy spool in the rear. The front slips slightly so it shouldn't break. The rear has more load on it anyway.
Krasi_5000: It turns. Just ... not very well, lol. I did this for straightline speed more than road course driving, as you can tell from the super high CG :D

As far as performance, I never got to get it to speed until right before the batteries crapped out on me because the lot in front of the shop isn't exactly smooth. So I did donuts most of the time. And boy can it spin, lol. I'll probably try it again tomorrow down at the parking lot by my house since it's a bank and will be closed tomorrow. Also get to try the quarter scale :p
Anyway I'll keep you all posted on what it does/doesn't do. If nothing else, it makes a heck of a donut machine :D
-Eric

[sportmaxxracer]

bassically if one motor spins slower than the other it will be sped up by the other. motors have touqe if there is a load applied but if the load is tooken of and the faster motor speeds it up the slower motor will easilly be sped up to match the other without stressing the spur.

[rccardude04]

bassically if one motor spins slower than the other it will be sped up by the other. motors have touqe if there is a load applied but if the load is tooken of and the faster motor speeds it up the slower motor will easilly be sped up to match the other without stressing the spur.

Yeah, pretty much sums it up :)
-Eric

[rccardude04]

Hmmm ... I wonder if this'll handle better with oil in the right rear shock. Just filled em all with 60wt. This as opposed to 30 that was in there (except the right rear, which was empty entirely).
Maybe that was hindering my straight line capabilities :p
-Eric

[tec_41]

That just may help :rolleyes:

[rccardude04]

Smart alec :p It's not my fault the shock is a retard!
just kidding. I'll find out tomorrow :D
-Eric

[rccardude04]

Well... the thicker oil DEFINATELY helped out on keeping it stable. Took it down to the parking lot earlier (like 5 minutes ago) and it tracked straight and stable as all get out. However, the motors didn't quite last as long as I would have liked. One of them went out, so I kept driving for like another lap and pretty soon it stopped entirely. So I walk home, take the temp down here, it reads 195. I took some pics after it'd cooled for a few more minutes and the picture says it all :D

-Eric

[HauntedMyst]

lol nice work. did you clock it?

[tec_41]

That things GOTTA have a lot of torque, right?

[rccardude04]

Well, it DID have a lot of torque, lol. You have to pump the throttle to get any speed or it will just loop around.
As far as top speed, I'd have to guess between 45 and 50. It's pretty insane. I almost wonder if I couldn't get away with another gear taller. Only thing is, I'm out of room for mesh on the rc10 motor plate. When/if I get the Titan motors, I'll have to see what they do. Should be interesting.
Also my little jerry rigged brake thing works rather well. It locked up all four. Pretty impressive.
Now I think I need to pick up a couple of the stock E-Maxx motors, and if that works nicely enough, maybe a traxxas EVX should be on the list. That would make for one impressive car :)
-Eric

[egdinger]

I want to see some pics of the breaks. That looks mighty insane. Have fun and don't kill yourself.

[rccardude04]

The brake is just a scerw and piece of pianowire rigged to short the motors when i push back on the trigger. I'll get a pic tomorrow if I can remember to.
-Eric

[ElectricThunder]

Cool. Is that a custom motor plate or off of an E-maxx?

[rccardude04]

It's actually a motor plate from an RC10. We had one laying around at the shop so I took it as a donation and set it up on a date with mr. dremel. Worked out rather nicely. :)
-Eric

[thefasttrack]

lemmy see a pic of the breaks they have to be cool

[Heavy Throttle]

Track down an EVX on ebay or someplace to get one cheap from and wire that puppy in. Then you can run 14 cells and have all your controls for braking and be able to speed up like you need to.

[rccardude04]

Yeah, I'm going to get some Titan e-maxx motors and see how those work. If it's fast enough with those, I might have to get an evx.
The camera's batteries are dead so I can't get pics for a while (till my dad becomes unlazy and charges them anyway). But when I get a chance, I'll get a pic or two of the brakes.
-Eric

[rccardude04]

Holy cow, they do go cheap on ebay...
I think I could do 50 bucks :) Just not till after I make sure it still kicks butt with the Titan motors. Of course I guess I could use it as a clod speedo and grab those other 5 D cells I have laying around ;)
-Eric

[mr_pushrod]

If it was that torquey with 540s it should be nearly undrivable with 550s! Can't wait to hear how it goes, sounds like a bit of a giggle, lol.

[C.J.OO]

Err, why are there 2 pinions, but only one spur. Would this damage it since the 2 motors wont run excactly the same? :confused:

One will push the spur the other will pull the spur..just like a e-maxx...

[rccardude04]

pushrod, it's hilarious. I'm almost tempted to take it to the race track and drive it. Just to see if they'd let me run in novice :p
If it's too torquey, I can always gear it up a tooth. I'll just have to grind on the upper motor plate a little.
Sadly, this is going slightly to the back burner since I'm saving to get a savage before I go on vacation with the gf. There'll be some NICE monster truck bashing areas where we're going. But if I have an extra few bux laying around sometime, I'll be sure to bring this forward first! :D
-Eric

[Frapechino]

sweet man wish I had the same results as you when I get bored lol