question about Brushless

[Beane_O]

Okay, I have asked the same thing in another forum but the answers were vague. Any one here can simplify what the difference is between certain BL set ups? Like, what is the difference between a 5500 and 5300 or something like that?

[RCShocker]

Like, what is the difference between a 5500 and 5300 or something like that?

Not that much 

Are you comparing the same brand/model motors? Are you asking about the KV ratings(5500 & 5300) of any bl motor? It's hard to guess-timate with no real details.

What brand and size system/motors are you asking about specifically?

[Cajun]

Any one here can simplify what the difference is between certain BL set ups?

There are two basic types of brushless systems. You have sensored and sensorless systems. Sensored brushless systems use a wire attached to the motor to locate the rotor (called the commutator), sensorless motors calculate the location in the ESC and make a "best guess" at the rotor location. That is what causes cogging in sensorless motors. Sensored systems usually need to stay with the same brand parts, for example a Novak ESC needs a Novak motor and vise versa, where as a general rule, sensorless systems can be mixed and matched to suit your purpose, example, you can run a Wanderer motor on a Mamba Max ESC.

You have basically 3 sizes of BL motors, S (Mamba Max sized or 540), you have L sized cans, and you have XL sized cans. Generally you would use the larger motor in larger, heavier applications. You wouldn't want to use a S can in an E-Maxx, on the other hand, you wouldn't want to use an XL can in a touring car. Normally the larger the motor the lower the KV rating. More on that below.
Wanderer motor size comparison (XL, L, S):


There are two basic types of brushless motors, inrunners and outrunners. Inrunners get their nickname from the fact that their rotational core is contained within the motor's can. Compared to outrunner motors, inrunners tend to spin faster, often as high as 7700 RPM per volt, you'll see more of these in the faster movers i.e. monster trucks, large conversions, 1/10 stadium stuff and touring cars. However, inrunners lack torque. As a result, most inrunners are used in conjunction with a gearbox in most cases. Outrunners spin the outer shell around its windings, much like motors found in ordinary CD-ROM computer drives. Outrunners spin much slower than their inrunner counterparts with their more traditional layout, while producing far more torque. This makes an outrunner an excellent choice for crawlers.

Like, what is the difference between a 5500 and 5300 or something like that?

The numbers you're talking about refer to is the "KV rating" of the motor. The KV rating refer to the number of times the motor turns per volt passed through the motor by the ESC, for example, a 5700 kV motor, supplied with 11.1 volts, will run at a nominal 63270 rpm. As a general run of thumb, at the same voltage, the higher the KV the faster the motor and the lower the torq, with lower KV the higher the torq and the slower the motor. So, the larger the motor, the lower the KV, although there is a range of KV ratings available in each size to allow you to build your set up to suit the application.

That's the very basics, and of course there are variations to all of it. This also is basically surface info, when you go to aviation or boats, there are a different set of rules. Hope that helps a little and makes sense, it did in my head.

[Beane_O]

ah... So if the number is higher the faster but less torq. So what is the best middle ground for a 1/10?  Is the VXL set up slightly the middle ground type or is there better, Like one of the CC MM's?

[Cajun]

Middle ground for a 1/10th scale 2wd like a Rustler would be somewhere around 5000kv. 4wd drop the number slightly. If you're doing a monster truck or a 1/8th conversion, move up in can sizes. What truck are we talking here before we get specific?

[Beane_O]

Middle ground for a 1/10th scale 2wd like a Rustler would be somewhere around 5000kv. 4wd drop the number slightly. If you're doing a monster truck or a 1/8th conversion, move up in can sizes. What truck are we talking here before we get specific?

Well of all things, my Slash  It's something I have kept on the back burner for a while and still will be until money improves. I had all the plans for the Slash until my wife's student loan stuff went down so my check is now part of the hold down on bills. I really love the idea of going brushless it's just the fact that getting the LiPO's and the charger that really nails the plan. If I go with a VXL (it would be the cheapest and easiest to program) it would come out better for me with the battery side. Also, from what I understand, the LiPO chargers are pretty high, if you want a good one that is and I would differently get a lipo sack if I do all this so we are looking at around 300 + for me to do BL right now. I ain't saying I'm in a rush to get into BL but I would like to have my budget planed out pretty good when I do.

[Beane_O]

okay, someone here is selling a MM 7700 kv, lower gear and pinion would be for this set up for example?

[Ruthless]

okay, someone here is selling a MM 7700 kv, lower gear and pinion would be for this set up for example?

You need to also figure out what size lipo you want to run

[Cajun]

In a Slash I'd run something around the range of 4500kv to 5500kv. The 7700kv set ups are normally used in touring cars. I don't know if you could get the gearing low enough on a Slash to handle a 7700kv motor.

[Beane_O]

Okay, not saying I am totaly set on VXL but, what do they run as far as kv goes? Also, what is the highest Lipo you can run on a VXL?

[Ruthless]

Okay, not saying I am totaly set on VXL but, what do they run as far as kv goes? Also, what is the highest Lipo you can run on a VXL?

I believe they are either 3500 or 3600kv and they can handle up to a 3s. Great offroad motors!!