Amp Draw
 

Ok so im assuming that theres no way to figure out theoretical amp draw? Or is the amp rating of the motor the most that they will draw constant? I thought i saw somewhere that a 7xl will only draw 80a is this correct. I assume that the burst could hit almost 120 if not more.

Theoretically, a motor can pull tons more than that. During stall, there is only the motor resistance to limit current. For example, a 7XL resistance is 0.0056 ohms. Using 4s lipo, that a theoretical 2,642A. So, your current will be somewhere between that and 0A. Of course your ESC, wires, connectors, batteries, etc will not maintain 14.8v at anywhere near those currents, but you get the idea. The more mechanical load you place on a motor will increase the starting current, so gearing, weight, etc plays a big role.

i think the 7XL is closer to 100 amps, I run a 1515/2.5d and its around 80 amps

Ok i guess my thing is im setting up a revo and im deciding if i should use an airplane based esc and mechinal brakes. Is it possible to use the motor as a brake with the clutch?

in order to use motor breaking you have to remove the OWB and lock the tranny in 2nd gear and I dont think its possible to do with the clutch setup but maybe somebody has been sucessful

Ok i thought that that was the case. at this point im going to setup the revo for 4s on either a 9xl or something similar and run my MM.

Ok so maybe i changed my mind after looking around. Would it be worth it, to run an airplane ESC with a pistix and use 6s? Do you guys think that the higher voltage will yeild a better run time or should i stick with the s on the MM?

higher voltage will yield longer run times if you pair it up with a lower kv motor, I get 30 min run times with my 6s 5000 FP pack in my converted Revo with a Neu 1515/2.5d

Ok im seeing some vids of a MM on 5s, is this doable with a standard one?

There is a reasonable chance that a modded one will run on 5s but perhaps not with a fully charged pack...

7XL though won't take 5s... You need to keep a feigao around 30k...

yea im seeing that in the calc. I think im going to setup for now with 4s as i have everything i need including batteries. Ill most likely either get rid of some of my other junk and pinch some pennys to buy a MMM and a neu motor along with batts.

The MMM motor combo is out in August and is going for 270 -

Really? the price on tower is 350, 270 is way more in my price range is there somewhere i can preorder at 270?

nah it was at 287 for like a day, they got hit with a bunch of $60 coupons so they put up their price $60 to compensate.. kinda dodgy. Good price anyway I think, at 287 - 60 they were probably loosing out.

I tried searching but i havent come up with anything, whats the general rule of thumb on trouble shooting elctronics. Hot controller means what?

Thanks i knew this was somewhere.

lol, we need a sticky that maps out where the stickies are! :lol:

Seriously how about a section with only stickies...

Some of the sub forums are getting to have too many stickies...

I'll leave that up to Serum/Mike to decide.

lol i agree with the above!

Ok so im a little confused, im looking a the true rc 8000mah packs, will i need to charge a 4s2p pack with an 8s balance charger?

The way I imagine it is: hot esc usually means there is too much current flowing through it. usually that means the motor is drawing too much current.

The motor will draw more current the higher it is geared, the heavier the vehicle, if there is any binding in the drive train it doesnt help either. and also if the motor is hotter it has more resistance and thus has to draw more current to output the same power.

Basically, check your drivetrain is moving freely, if so then gear down.

If there is some fundamentally flawed logic in there someone please correct me :)

Why not, there are programs like Motocalc which can provide you with data you are looking for. Question is do you know what to do with the data?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
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BrianG is correct, but there is no sense to talk about current draw when sensoreless motor shaft is stalled, ESC would limit current. It is much more important to track current while shaft is in motion, than you can observe all kind of interesting factors determine your motor performance.<o:p></o:p>
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If you just looking for maximum current draw for given motor, you are looking for the wrong parameter, because any motor can draw high current (depends for how long and which component would go south first, ESC, motor, battery, wires) in wrong configuration.<o:p></o:p>
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What you need is drive-train geared for motor which would be running most time in high efficiency range. That takes practice or understanding of motors.

Any info on the battery charger?