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mamba is good...no?

Old 01-04-2010, 01:31 PM
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vpower
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Default mamba is good...no?

hey im going to buy a mamba 9000 (its not a stupid idea if all you do is drag race) and i want to know if i can put a 3s lipo on it. ill be be running it on my hpi e-firestorm.(and if i cant run it on a 3s lipo can i put a cooling system to be able to run 3s lipo?)[&:]
Old 01-04-2010, 01:33 PM
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vpower
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Default RE: mamba is good...no?

also is the motor roar legal?
Old 01-04-2010, 01:37 PM
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rebuilder
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Default RE: mamba is good...no?

3s lipo would put it ast 108,000 rpms unloaded.....................too high in my opinion........you can consider a 5700 on 3s.......or the 9000 on 2s................ And thank goodness you werent one of the guys saying he wanted a 9000kv in a wheely king..............9000's are built for drag racing according to Castle techs.
Old 01-04-2010, 01:54 PM
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vpower
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Default RE: mamba is good...no?

well first thing is not only am i dragracing but i want to break the speed barrier of a offroad rc
Old 01-04-2010, 02:00 PM
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Default RE: mamba is good...no?


ORIGINAL: vpower

well first thing is not only am i dragracing but i want to break the speed barrier of a offroad rc
It'll burn up offroad............[]
Old 01-04-2010, 03:01 PM
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vpower
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Default RE: mamba is good...no?

BUT I WONT USE IT OFFROAD
Old 01-04-2010, 05:12 PM
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Default RE: mamba is good...no?

This right off of the Castle website.

Input Voltage - 6-8 NiCad/NiMh MAX 2s LiPo MAX



Here is a link to the 9000kv motor info

http://www.castlecreations.com/products/cms36-9000.html
Old 01-04-2010, 05:15 PM
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rclugnut10
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Default RE: mamba is good...no?

at somewhere around 100K rpm's rotors just shatter, because of the force on them, they can't hold together, so no there is no way you can run a 3s on that motor, other motors may even get you faster. and i don't think its roar legal

the lug
Old 01-04-2010, 06:49 PM
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Chris_RC
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Default RE: mamba is good...no?

LOL, you said you won't use it offroad, but you want to know if it is ROAR legal? FYI ROAR doesnt hold drag racing competations.
Old 01-04-2010, 07:50 PM
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vpower
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Default RE: mamba is good...no?

ORIGINAL: Chris_RC

LOL, you said you won't use it offroad, but you want to know if it is ROAR legal? FYI ROAR doesnt hold drag racing competations.
who asked you mr i dont give a dam(once i prove im the fastest ill just buy a good 2s lipo and use it for offroad)
Old 01-04-2010, 07:52 PM
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vpower
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Default RE: mamba is good...no?

ORIGINAL: rclugnut10

at somewhere around 100K rpm's rotors just shatter, because of the force on them, they can't hold together, so no there is no way you can run a 3s on that motor, other motors may even get you faster. and i don't think its roar legal

the lug
isnt there a way i can reinforce the thing by giving it better bearings? and cooling it with a liquid cooling system(i will try to figure out a way to put one on it)? plus with a 3s li-po you wont reach those rpm,s because you'll want to multiply 11.1x9000
Old 01-04-2010, 07:55 PM
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vpower
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Default RE: mamba is good...no?

and not only that in the cc website it says (These Castle motors can spin to more than 100,000 rpm, everybody else's magnets just want to sail off the shaft at that kind of speed. Not Castle's. Look...see...still got the uh...the ol' tagger on it...see...I've never even run it.)
Old 01-04-2010, 07:58 PM
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Default RE: mamba is good...no?


ORIGINAL: vpower


ORIGINAL: rclugnut10

at somewhere around 100K rpm's rotors just shatter, because of the force on them, they can't hold together, so no there is no way you can run a 3s on that motor, other motors may even get you faster. and i don't think its roar legal

the lug
isnt there a way i can reinforce the thing by giving it better bearings? and cooling it with a liquid cooling system(i will try to figure out a way to put one on it)?
that would remove the heat not the physical forces acting on the motor
Old 01-04-2010, 08:11 PM
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vpower
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Default RE: mamba is good...no?


ORIGINAL: SyCo_VeNoM


ORIGINAL: vpower


ORIGINAL: rclugnut10

at somewhere around 100K rpm's rotors just shatter, because of the force on them, they can't hold together, so no there is no way you can run a 3s on that motor, other motors may even get you faster. and i don't think its roar legal

the lug
isnt there a way i can reinforce the thing by giving it better bearings? and cooling it with a liquid cooling system(i will try to figure out a way to put one on it)?
that would remove the heat not the physical forces acting on the motor
but it says it can handle over 100000 rpm[&:]
Old 01-04-2010, 08:16 PM
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Default RE: mamba is good...no?

well if it handles 100,001 RPM without flying apart that claim is true, if it hits 100,002 and flys apart that claim is still true seeing it was safe at 100,001 RPM and that is over 100,000 RPM

but chances of it surviving 108,000 RPM's is kind of slim
Old 01-04-2010, 08:32 PM
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vpower
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Default RE: mamba is good...no?

well i dont think i have enough space to reach full rpm[]
Old 01-04-2010, 08:33 PM
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Default RE: mamba is good...no?

There is absolutly no possible way to get the 9000 on a offroad track. You'd have to go with a 1cell lipo! Even the 7700 and 6900 were worthless nukem monsters. Your better off going with a 4600 and running 3 cell and some gear. Then it'll still be fairly practical for off road.

Even for drag racing the 7700 and 9000 are too hard to tame into something useable. The only purpose those winds serve is to relieve a newb from his money twice. (the second time is when he wisens up and gets a 4600.)

I'd look towards the MMpro, I belive it has dynamic timing, and just go with one of the hotter winds that Hpi recommends for that truck. A MM pro and a Trinity Duo 7.5 or 6.5 would be plenty in a firestorm.
Old 01-04-2010, 08:34 PM
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ELK
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Default RE: mamba is good...no?

im pretty sure 11.1 times 9000 is 99900 rpm
Old 01-04-2010, 08:36 PM
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Default RE: mamba is good...no?


ORIGINAL: vpower

ORIGINAL: Chris_RC

LOL, you said you won't use it offroad, but you want to know if it is ROAR legal? FYI ROAR doesnt hold drag racing competations.
who asked you mr i dont give a dam(once i prove im the fastest ill just buy a good 2s lipo and use it for offroad)
Please post a picture of your smoked motor!!
Old 01-04-2010, 08:46 PM
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BigTb17
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Default RE: mamba is good...no?

A fully charged 3S Li-Po is 12.6 volts (not 11.1), which works out to over 110,000 RPM. However, figuring load and voltage drop it won't likely reach that RPM unless you run it unloaded, or with the wheels off the ground. However, 100,000 isn't some magical number above which a motor will fly apart and below which it will run flawlessly for ever. Running a motor in the 80,000-110,000 RPM range is definitely going to be hard on it, particularly considering it will probably be running hot. While it may not blow a rotor right away, chances are it won't last as long if it's run on 3S (and there is always the chance of failure).

Even with VERY low gearing it will run hot on 3S. I've seen high KV motors heat up in seconds when run on too high of voltage with a large load. Liquid cooling may help, but will still only be useful for speed runs because the water would just heat up eventually. It's not like a boat where it draws from the lake. You would need an on-board water supply which would simply heat up.

Is there a reason you are considering this motor vs other options (such as lower KV at higher voltages, or even a larger physical size)?

Nobody can make you not use it if you want to. People have given their opinions and you can take them or leave them. If you are willing to accept the risks then go for it.
Old 01-04-2010, 09:43 PM
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Default RE: mamba is good...no?

Just pulled this off of the Castle site...............a very clear and concise chart of their motor apps for offroad 1/10:

4600kv = Best for off road use
5700kv = OK for off road
6900kv = not so good
7700kv = baaaaaaad
9000kv = %$&%$!& !
Old 01-05-2010, 12:56 PM
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Default RE: mamba is good...no?

as per the title of this thread, the Mamba is excellent, yes, provided you use it for its purpose.

See above for motor chart...
Old 01-05-2010, 01:34 PM
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cenracer1
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Default RE: mamba is good...no?

I want to see him run this motor and I want to see the results.. I looked at this motor when it first came out but after a few calls to Castle and talking on the forums, I kept my 5700 in my Rustler.. It already too fast for the truck with3S, so I just run on 2S now... Obviously the motor won't spin loaded anywhere near 100K rpms, but even around 80K or so its not long for this world..
Its his money.. let him try it.. but ask yourself this.. don't you think that the guys at Castle or even the guys who do the speed runs thought about this motor.. there is a reason they don't use it.. Low KV and high voltage is the faster way.. not High KV and High voltage..
Old 01-05-2010, 02:13 PM
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Default RE: mamba is good...no?

If you wanted to run a touring car or a really light 2WD buggy for short periods of time you could run this motor on 3S. I doubt the rotor would come apart because you will not get anywhere near 100K RPM with car running on the ground. The major problem you're going to have is heat build up. You might get 2 mins of run time before the motor gets too hot to run in one of those light weight cars. The Firestorm is too heavy for that motor. You're better off with a 5700 geared really low for normal driving then gear it up for the Speed runs.

I personally have run a 7700 on 3S in a light touring car but the motor temps where exceeding 180F after 4 mins races and that was geared pretty low. I found I actually was faster running a 5700 on 3S with more gearing. The motor also ran in the 160F range.

Old 01-05-2010, 04:20 PM
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Default RE: mamba is good...no?

I have had the 9000 in a slash on 2s and if you don't have it geared low enough it will over heat very quick. Not a good motor for offroad racing.

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