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Other › HELP needed ... Hacker B40-8l and master esc-40-B
10-11-2005 01:00 AM  13 years agoPost 1
xrbeast

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Texas, Irving

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Guys ..i need help...
I am running a hacker B40-8l through a hacker master esc 40-B heli with a 5400mah 3S2P 8 C discharge with peak 15C(from electric power)... and turned by a 15 tooth pinon..

The hovering after 5 mins...there were power loss and motor and esc was way hot. .. so i put her down...

can i run a small pinon for this ?? am i running it too high ..??
throttle and pitch curves values were set at same values..

I am jus a beginning to RC heli .. but i fly a real one..

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10-11-2005 01:01 AM  13 years agoPost 2
xrbeast

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Texas, Irving

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i am running it with a quick 15 metal head...
i think i am running the throttle to low.. less than 80%
which caused the FET Transistors in the ESC actually switch FULL-ON to FULL-OFF very quickly, several thousand times a second. Each transition causes a tiny amount of heat, proportional to the avearage current flow.

At very low percentages, there is not enough current to cause heating. At very high percentages (95 to 100%) the bulk of the current flows via the longer ON times and everything is OK. The "danger zone" of excessive heating happens in the 50% to 79% area... there is enough current here to cause heating, and the on/off times are such that the heating can be excessive

the technical part was extracted from logomaniac forum

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