hey u never give me expert advise leh


" hi joe,

I recently short a 9xl feigao within 2days, feigao china emailed me saying that I may hv over amp d motor. Any advise on this?

I gear at 14/62
Lipo 4s 5000 at 25c
Mmmv3 "

Maybe u need higher voltage...

4s 5000 lipo not enough? 6s 5000 better?

is there a excel sheet for watt or amps needed for motor?

Yeah....thats what i heard too......i guess 3 yes makes it a fact......:smile::smile::smile::lol::lol::D....... ........and normally friendly & always willing to share , always smiling are the signs of loaded kaki.......wahahahhaha:D:D:D:lol::lol::lol:....... ..not easy to maintain those BL monsters man........my Fusion also need to masuk company's bill........kekekekkeeke..............sigh:cry::cr y::D

Mmmm.....3S 4900mah 20C x 2....meaning 11.1V x2= 22.2V:)............what will be the run time like?? :confused:

I wonder my Hobbywing 80A w 3665 BL Motors:) can take this combination as well?? How do we know , how capable are our systems??? To what extend...?:confused:

And if higher C, say like 30-35C, is it still ok??? The last thing i want is keluar asap from my ESC or Motor........

Hi SuperEk4,

Sorry, I was having a little bit if internet problem at home :sweat:. Connection erratic. Was trying to upload this chart of feigao motor rating :

http://i198.photobucket.com/albums/a.../54020Size.jpg

This chart shows that the 9Xl can take 74A before its rating is exceeded. Normally, if overamped, motor should get overheated & the rotor loses its magnetism (to a certain extent). However, for the motor to overheat until the enamel melt & cause a short. Hmmm, that will take a hell lot of current...:eek:

Regards,
Joe Ling

hmm... (I think laa....) to prevent your motor from overamped....

one way is to increase resistance, perhaps by increasing the pinion size to about 16-17T ?

another way is to reduce the voltage, use lower S count Lipo battery.

Or control Tx throttle curve :D

Or use a smaller ESC, and give that MMM ESC to me :lol::lol::lol:

Hi Radical,

My target runtime is 20 minutes. A 5S 6000mah has similar capacity & in a truggy which is slightly lighter, 20 minutes is possible. So, I guess 6S which is slight more efficient in a heavier MT like the Revo can last 20 minutes.

U have to check the spec of your esc to make sure that it is 6S capable. If not, u will see the magic smoke escape from the esc, very hard to put it back in :lol:

Battery C rating the higher the better.

Regards,
Joe Ling

hi Joe, I saw d chart, I wonder if a normal setup of 14t n 62 spur will overload d motor? Even I use d speed chart website n calcuated d power output it did not exceed.offshore has stop emailing me now my only hope is feigao but dun think they will swap one for me.

I m so fed up now I bought a watt meter.any advise on this topic? It will b a great help for 1/8 electric guys

Hmm, decreasing cell count is going to increase current draw. Put it this way - it's about power output in the end. Simply put :

Power = Voltage X Current

To produce the same power with lesser voltage, more current is needed & vice versa.

More current results in more wasted heat due to resistance in the system.

So, higher voltage setups tends run cooler & longer for the same capacity of power source (battery)

Regards,
Joe Ling

PS : Frost, Feigao cahrt as attached

My personal feeling is that the quality of the motor is in question lah.

Some kind of wattmeter is a good investment. Use this one :

http://www.eagletreesystems.com/MicroPower/micro.htm

http://www.eagletreesystems.com/Micr...3-angle-sm.gif

Records many things like battery voltage, current draw, temperature... I get good results but can be a hassle for a lazy bum like me.


Regards,
Joe Ling

hmm.. if we use Ohm's Law, I = V / R, voltage increase also means amperes increase... bro... :weird:

Aiyah, have to use formula in context lah :sweat:

BTW, HN fans - check this out !

http://www.neobuggy.net/images/News/x2el.jpg

Regards,
Joe Ling

that's nice but I prefer to chose my Esc n motor, how much izzit?

JL, Thanks.......i have just check the 80A is good for 4s.......only 150A is good for 6s.....oh well............i will just have to take it easy.......hehehe........:D