Model Boat Mayhem
Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: Klunk on April 24, 2015, 07:32:27 am
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is the standard motor capable of handling a lipo battery of 11.1v 5200mah? I know she will skip and the torque roll will increase a lot. I just don't want to set it on fire! Running with a 25amp moronic sc with max delay for reverse
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I think it will push the motor too far, especially without water cooling. Consider fitting a brushless replacement.
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No Peter.
Magic smoke will soon follow if you use an 11.1 lipo {-) However you may well get away with a 7.4 two cell lipo pack.
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ive run one on 9v with NO majic smoke
Dave
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A fully charged 3cell Lipo will kick out 12.6v fully charged
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If you want to race then it may be worth reading the rules before changing to brushless or lipo :police: :police:
Ned
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It's not about racing. One member burnt out a speed controller after whacking it into reverse on a 11.1v lipo. The question is not wetter o should or should not, but what the motor is rated for. Simple question.
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By throwing it into reverse, you effectively dead-short the speed controller through the stalled motor.
You're then into seeing which bit pops first - motor brushes, connectors, armature, wiring or speed controller. I assume no fuses?
A lot will depend on how thick your wiring is and how well made any joints are - but your talking about the full current output from the battery being dumped somewhere as heat.
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Please read the question! what is the motor rated at in volts. I don't care about anything else I'm enquiring after the motor specs. VERY SIMPLE QUESTION NO YES OR NO JUST WHAT IS THE MOTOR RATED AT!
CAN I MAKE IT ANY SIMPLER? ???
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I suggest you use Google for the specs.
It can't be any simpler.
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Peter
take a look at his mate, it may help.
http://www.mabuchi-motor.co.jp/cgi-bin/catalog/e_catalog.cgi?CAT_ID=rs_540sh
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Is it not a 550 FC ?
Ned
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Cool !
http://www.mabuchi-motor.co.jp/cgi-bin/catalog/e_catalog.cgi?CAT_ID=rs_550pcvc
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And what pray tell is a 550fc? :-)
Most stock 500/540/550/600 can motors are only good up to about 8.4v or 9.6v, without the benefit of some sort of reduction gearbox, so no, much flames will follow!
Try measuring the amps of a 500 at 7.2v then 8.4v then 9.6v under some sort of load and watch the amps rocket up.. been there, done that, whats the word?
Suit yourself?
:}
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Wot it says for a Club 500 on the website motor specs for aforesaid model.
Just saying wot I read. %%
Ned
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the club 500 website is cr*p and gives no relevant data. all it says is the spec for racing ie stock motor prop etv running off a 7.2v battery . google 550 fc and nothing relevant comes up. I can get specs on 550 motors that range from 6v max to 14v max, but nothing to this particular motor. fired off and email to the relevant vendors, lets see what comes back.
ps most 12v batteries charge to 13v so if its a 12v motor it should be fine. Ran it last sunday at a modest pace, but never fully opened it up due to putting a 6v motor accidently in a boat with a 12v battery and not realising. lots of smoke!
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ps if I want to blow a boat up I will at Mayhem Weekend!!!
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Ian will have a bit of pyrotechnic to help with the blowing up. %%
Ned
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ian better have my cheddars or no tents will be put up!!!
yes I will have my s**t brown teletubby suit on as well
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Please read the question! what is the motor rated at in volts. I don't care about anything else I'm enquiring after the motor specs. VERY SIMPLE QUESTION NO YES OR NO JUST WHAT IS THE MOTOR RATED AT!
CAN I MAKE IT ANY SIMPLER? ???
It´s not that simple {-)
Voltage ratings are pure "modellers stories".
A motor has 2 ways to die.
1) Mechanically by throwing magnets or parts of commutators or killing bearings, this is what´s limiting the voltage. You´ll never reach that point with 3S, you would probabaly need 5-6S and no load on the motor to kill it this way.
2) and much more likely by current. That´s why 99% of all motors die.
Unfortunately current is not directly depending to voltage (if you reduce prop diameter and pitch in the same way you increase the voltage, the current will not get bigger) but in fact if you use the same prop and double voltage you´ll need 8 times the current.
With the same prop as used on 6 cell NimH you will probably kill it on 3S.
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Just fit a 28mm outrunner rated at 1400kv, and you will have a brushless equivalent of the brushed set-up on 7.4 volts, only it'll be largely maintenance free, and more efficient.
If you want a bit more grunt think about a bigger prop or higher kv motor.
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right, had a reply from club500slipway.
the answer is the motor is rated to 9.6v
thanks for all the advice.
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Well you didnt get MY hint then did you Pete O0 O0 O0 O0 O0 O0
Dave
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I did Dave, I just needed to check it out