LIPO/ Mamba max question - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-25-2008, 06:41 PM   #11
thrash metal
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re running 3s lipo and even 4s lipos with a mamba 7700?

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this question and answer was taken word for word from the castle creations website in the f.a.q. section

"i see on your website that you cannot use a 3s lipo with the mamba maxx 7700kv motor . why not?"

"heres where the physics come into play. centrifugal forces increase by the square of the diameter. in laymans terms. the larger the diameter of the motor the more centrifugal force will be generated for a certain rpm. as such the larger the motor diameter the lower the rpm the motor can handle. 3s lipos put the 7700kv out of its maximum rpm range and will shatter the magnets inside ."

makes sense to me after reading castles explanation
since the mamba 5700 can achieve higher rpms it can be safely used with 3s lipos. the 7700 cannot therefore ill never use 3s with my 7700 as i dont want to shatter the magnets and cook the motor.

ill bet if you destroy your magnets in your 7700 because you ran 3s lipos castle will not warranty the motor once they hear you ran 3s lipo.

and i cant see how you could even attempt to run 4s lipo in a b4 or a t4with a mamba 7700. theres only so many spur gear ratios to choose from. isnt there only 87t ,84t and 81t?
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Old 04-26-2008, 10:35 AM   #12
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a buddy is using the 7700 system on 4S, in a 120MPH+ TC4...

and running those high RPMs will destroy magnets.. I've done a 5500 motor with 6S, and the magnets on the rotor just turned into pebles.. but man.. it was fast... the sound was awesome down..
The Power of BRUSHLESS!!!!!
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