cc's 9000kv brushless motor

[NeXt559]

any one have any experience w/ their castle creations 9000kv motor?

i just saw it on their site but cant seen to find it again

[EeePee]

Was it maybe Tekin's site?

http://www.teamtekin.com/blmotors.html#redlines

[engineerjoe]

I thought the general rule of thumb was 50,000 rpm's max (due to the bearings in the motors). so with a 9000 rpm/v motor you should only run 6V max.

gear down, volt up
I'd say go with the VXL motor (3500kv) or the 4600kv and a 4s lipo

this will keep everything pretty cool and last a long time.

[TwistedCreations]

Originally Posted by NeXt559

any one have any experience w/ their castle creations 9000kv motor?

i just saw it on their site but cant seen to find it again

http://www.castlecreations.com/products/cms36-9000.html

[engineerjoe]

Originally Posted by TwistedCreations

http://www.castlecreations.com/products/cms36-9000.html

wow!! 100k bearings! nevermind what I said before, go with this!!!!

[chip cross]

Originally Posted by engineerjoe

I thought the general rule of thumb was 50,000 rpm's max (due to the bearings in the motors). so with a 9000 rpm/v motor you should only run 6V max.

gear down, volt up
I'd say go with the VXL motor (3500kv) or the 4600kv and a 4s lipo

this will keep everything pretty cool and last a long time.

Where did you get that info from ???

3,500Kv x 14.8 = 51,800
4,600 Kv x 14.8 = 68,080

Sorry, but that will not stay cool for long.

[engineerjoe]

Originally Posted by chip cross

Where did you get that info from ???

3,500Kv x 14.8 = 51,800
4,600 Kv x 14.8 = 68,080

Sorry, but that will not stay cool for long.

I guess your setup is different than mine.
Mine stays cool unless I WOT (wide open throttle) 2 packs in a row with no down time.
(I will note that I am using A123's so it's at 13.2V, and I am using a sidewinder, not a MM)

I use this setup in two different cars:
1. Slash w/ VXL, 4s2p A123
2. Tamiya Durga w/4600kv 4s1p A123

[JohnRobHolmes]

The old castle motors were rated for 60k max. The new rotors are rated at 100k rpm.

[chip cross]

Originally Posted by JohnRobHolmes

The old castle motors were rated for 60k max. The new rotors are rated at 100k rpm.

WOW, thats gonna get hot.

[JohnRobHolmes]

The bearings will heat up fast, and boil off the oil. But, the rotors can take it

[NeXt559]

Originally Posted by TwistedCreations

http://www.castlecreations.com/products/cms36-9000.html

yup thats it
thanks for the link

im going to be puting it into a traxxas slash. honestly i dont even think im going to be using it to its full potential very often. at the monment im running a stock slash w/ a seven cell (*sometimes eight) and it seems plenty fast. w/ a new brushless system especially the 9000kv im probabbly going to keep it at 50% - 75% at most for longevity, but once in a while i want to able to "whip out the bull's balls" when i want to do some speed runs or show off a 12 year old thats running an e revo thinkin he's the s**t

[TattooKenny]

I have the small CC 9000kv for the 1/18 stuff.....FAST!!! I run the 7700 in the on road stuff.....and they are to fast!

[skellyo]

Originally Posted by NeXt559

yup thats it
thanks for the link

im going to be puting it into a traxxas slash. honestly i dont even think im going to be using it to its full potential very often. at the monment im running a stock slash w/ a seven cell (*sometimes eight) and it seems plenty fast. w/ a new brushless system especially the 9000kv im probabbly going to keep it at 50% - 75% at most for longevity, but once in a while i want to able to "whip out the bull's balls" when i want to do some speed runs or show off a 12 year old thats running an e revo thinkin he's the s**t

A 9000kv motor is a very poor choice for a Slash.

[redmiller]

listen to holmes i think he would no what he is talking about.I got a cc4600 on a mamba in a slash and its really all u need.I mean i dont think ur going to be making high speed runs for your youtube buddys.

[NeXt559]

Originally Posted by TattooKenny

I have the small CC 9000kv for the 1/18 stuff.....FAST!!! I run the 7700 in the on road stuff.....and they are to fast!

im using a 8000kv in my 1/16 scale edm w/ 11 cells . i cant even turn at speed, and this past weekend i ended up shattering a rim and shreading a tire when i hit a piece of glass on the road im planning on converting it to a drag racer actually

Originally Posted by skellyo

A 9000kv motor is a very poor choice for a Slash.

.... please elaborate

Originally Posted by redmiller

listen to holmes i think he would no what he is talking about. I got a cc4600 on a mamba in a slash and its really all u need...

like i said im probabbly not going to use all that power, and just run it at full capacity once in a while.
and who said need? i want excess!:grin:

...I mean i dont think ur going to be making high speed runs for your youtube buddys.

i dont see why not?

[skellyo]

Originally Posted by skellyo

A 9000kv motor is a very poor choice for a Slash.

Originally Posted by NeXt559

.... please elaborate

You have a higher current draw with a higher kv, which means more heat. With the torque required to push a Slash, that motor will be working very hard unless you can gear it down enough to compensate. It's much more efficient to go with a lower kv motor and run on higher voltage to minimize the losses.

How fast do you want to go with it?

[JohnRobHolmes]

A higher KV motor has less resistance, so higher amp draw does not indicate more heat. Efficiency does not corrolate with KV until construction extremes are met. Bearing failure is one extreme.


A higher voltage does allow use of smaller power wires however, since lower battery side amperage is possible for a given power output.

[skellyo]

Originally Posted by JohnRobHolmes

A higher KV motor has less resistance, so higher amp draw does not indicate more heat.

I agree with that. I probably didn't state it as well as I should have.

Do you not agree that the additional torque load placed on a high kv motor in this application will result in an increased current draw and in-turn, more heat?

[JohnRobHolmes]

I do agree there- as you put additional load on a motor it will heat up because of the increased amp draw. A CM36 can only push a vehicle so fast before overheating, this much will not change. You will just be able to hit XX miles an hour on a lower voltage. Harder on the battery, harder on the wires, but motor efficiency will not change.

Take a pede and gear it for 40mph with a 7.4v 6900 and 11.1v 4600 system. The motor heat should be the same. The 6900 system should be more nimble from the lighter weight. The 4600 system will have 1/3 longer runtime from the additional watt/hours added in the pack.

[skellyo]

Originally Posted by JohnRobHolmes

I do agree there- as you put additional load on a motor it will heat up because of the increased amp draw. A CM36 can only push a vehicle so fast before overheating, this much will not change. You will just be able to hit XX miles an hour on a lower voltage. Harder on the battery, harder on the wires, but motor efficiency will not change.

Take a pede and gear it for 40mph with a 7.4v 6900 and 11.1v 4600 system. The motor heat should be the same. The 6900 system should be more nimble from the lighter weight. The 4600 system will have 1/3 longer runtime from the additional watt/hours added in the pack.

The problem is that you'll have folks gearing a 9000kv for 50mph on 7.4V in the Pede. That's where the problem lies. Some people simply expect it to just be faster because it's a higher kv.