The_Lost_Otter

ok, i need some help under standing Kv rating in brushless motors. i am goin to buy this car in a week or so and would like to know wat would be a fast motor, and good esc. i am preety ew to electic, this will be my first 1/10 truck, and first brushless motor. i will race this truck, but more practicing at the rc track and jumping at the motocross track. but i want alot of torque and alot of top, i can adjust that with gearing too. and can you post links to the motor and esc thanks


[link]http://teamlosi.com/Products/Default.aspx?ProdID=LOSA0076[/link]

guver

My Feedback: (325)

The kv rating is the speed at which the motor spins in RPM.

a 4 kv would make 4000 turns in 1 minute at 1 volt, 8000 turns at 2 volts, ect.

The higher the number the faster it is spinning.

The_Lost_Otter

witch equals more speed and torque??

guver

My Feedback: (325)

It equals more speed (motor speed) and says nothing about tork.

The_Lost_Otter

ok but wat would be a good motor for his truck

Kemo

depends on how much you want to spend. You can go with Mamba, novak, LRP, Orion... the list is growing bigger every month.

I'd go with an Orion: http://www2.towerhobbies.com/cgi-bin...?&I=LXRPK3&P=7

Plenty fast at 4.5 kV @ 7.2 V = 32400 rpm.

The_Lost_Otter

the only thing i really need for this car is the esc and motor so it really doesnt mater

The_Lost_Otter

any one else?????????/

The_Lost_Otter

any one, might get this tommorow so i need to know wat to get

LiL Richy

Mamba 6900kv or 5700kv

Access

If you need to be ROAR-legal, the Novak motors are the best, for off-road get the 6.5-turn or higher.
If you don't care to be ROAR-legal, get the mamba max 4600, since that truck is so light. 6900 or more KV would be overkill unless it's a straight or oval track.

If you are going to be jumping a lot and you don't have much electric driving experience, you might want to get something less fragile than the MF2 to learn on.

Slo-V Flyer

Generally, the higher rpm the motor is, the less torque it will have compared to a lower rpm version. So a Novak 3.5R motor will have the least torque when compared to a Novak 6.5R or 10.5 motor's torque. Similarly, a Mamba 5700 motor will have more torque than the Mamba 6900 or 7700 motors. Less torque means your motor will run a little hotter and so to compensate a little, you can gear it with a smaller pinion.

The_Lost_Otter

its not my fisrt electic, just first brushless. i have an rc18t, i drive it every day and jump the heck out if it.

i plan to be doing small jumps, and i dont car if its leagle, once i start getting into racing more i will get a different motor

The_Lost_Otter

any one???? i think i am goin to go with the orin or novak

Slo-V Flyer

Novak GTB and whatever motor. You'll get smoother control, cooler running motor temps, and rebuildable motor. But limited to 6-cell or 2s lipo.

The_Lost_Otter

is this one faster [link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNLY4&P=7[/link]


or

this one?[link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXRHU3&P=7[/link]

Kemo

13.5 is.

I'd look elsewhere for a system... I've had nothing but problems with everything novak makes, along with other guys at our track.

The_Lost_Otter

i will go with a good novak esc, but also might get an orin motor

Phelansa

The higher the KV rating the Lower the Kt (Kt = Torque per Amp)rating. Keep in mind that the BL motors are very current hungry. In theory at 7700KV motor can have the same torque as a 4600KV motor. IF (Very big IF) you could supply the motors with unlimmited current and there was no heating problem.

The best advice I can give you. Is go for a LOW KV rated motor and then gear for the best speed. The lower the KV the lower the current draw, the longer the run times AND the more torque per amp. So you get a cooler, more efficient longer running, longer lasting motor.

For such a light truck I would look at either the MM4600 or the Novak XBR/EX 8.5 (500KV). The advantage of the Mamba Max is that it will run 3S LiPo. The advantage of the Novak is that you can upgrade to the sintered rotor for even more torque/performance/durabilty.

I own both companies products and I still have to find a problem with either!!

Kemo

I wanna correct a error I made. 13.5 is a motor that produces roughly the same performance as a stock motor. I was looking at it as a 13.5 kV motor, but I guess these go by "Turns" instead. Ever since first rc sized brushless motors came out, none of em went by "turns".

The_Lost_Otter

so a 13.5 brushless motor, would have the same power to a 13 turn brushed motor?

Slo-V Flyer

No, he just said the 13.5 turn Novak motor is about the same as a brushed stock motor (27 turn?) power wise. The turns Novak uses to name their motors is the number of turns in THEIR motor, not what it's equivalent to. Hope that clears it up for ya.

The_Lost_Otter

thanks, sorry but i still dont know wat to look for in a motor i want. i want it stupid fast, like i can go full blast by some one and they wont know wat it was

Slo-V Flyer

Well for a fast setup, if you can get 3s lipos, get the Mamba Max 5700 system.
If you want to stick with 6-cell nimh Ib4200s or 2s lipo, get the Novak GTB + 3.5R motor.
And a light-weight chassis (2wd buggy, 4wd touring car, etc).

I run the 3.5R in my Bandit buggy, clocked it at 55mph with 6-cell DTX 3800s... It does look like a "whizz" going by you: [link=http://www.youtube.com/watch?v=dWLeJrQuO4Y]Bandit 55mph short video[/link]

The_Lost_Otter

ya i want your buggy set up, can you give me a link to the esc, motor, and battery