[amarotica]

Hello everyone,
I just received a brand new King Arms Ultra Grade M4 RAS(I know its not very good) for free today from a friend but does not have battery. I am very experienced with electronics so I will build my own battery for it but I would like to know what you think the motor amperage draw is... I have many types of cells but would like to know what the max current is so I can put a fuse and resistor in of the right size. Also please do not say that "It is a bad idea, you need to buy a premade battery pack, etc" as I know what I am doing.

Thanks for the help!

Here is a link to the gun but mine did not include the extras... http://www.kingarms.com/productpage.asp?prodid=2284

 

[Lefse]

What exactly is the resistor for? For a stock AEG I would recommend a battery capable of putting out at least 15 amps continuously, preferably more. A stock AEG will typically draw 10-15 amps depending on it's internal setup. A 15-20 amp fuse should be adequate in this case.

 

[Airborne101]

There is no need for a resistor. The motor will draw however many amps it needs, and a battery that can supply more amps tend to perform better than one that supplies less.

Just install a fuse like Lefse said. 20amp fuses are the most common, however Tokyo Marui tend to use 15amp IIRC.

 

[amarotica]

There is no need for a resistor. The motor will draw however many amps it needs, and a battery that can supply more amps tend to perform better than one that supplies less.

Just install a fuse like Lefse said. 20amp fuses are the most common, however Tokyo Marui tend to use 15amp IIRC.

you don't think the motor will draw too much power and hurt the gearbox? The battery cells I am thinking of using are industrial quick drain built for high torque drills so they will give everything.

 

[Goibniu]

Even if your built battery can dump 100+ amps the motor will only draw what it needs to cycle. Voltage determines the speed, amps determines if the motor can pull the spring at that speed. If the amps that the battery can supply is too low then the rate of fire will drop but as long as you have enough amps to cycle (10-30+ depending on the gun) the voltage will be what determines how fast it will run.

I am assuming that you are building this with NIMH or similar cells so you should not have an issue. Stock guns can take a high drain LIPO 11.1 with the only typical issues being the trigger contacts eventually pitting from the arcing that occurs.

 

[amarotica]

Thanks

Even if your built battery can dump 100+ amps the motor will only draw what it needs to cycle. Voltage determines the speed, amps determines if the motor can pull the spring at that speed. If the amps that the battery can supply is too low then the rate of fire will drop but as long as you have enough amps to cycle (10-30+ depending on the gun) the voltage will be what determines how fast it will run.

I am assuming that you are building this with NIMH or similar cells so you should not have an issue. Stock guns can take a high drain LIPO 11.1 with the only typical issues being the trigger contacts eventually pitting from the arcing that occurs.

Thank you for the info, I will put in a fuse and call it good!