Hello I am replacing these with true controllers and thought I would post some pick of how to use a switch for brushed motor high amps 50 .simple cheap and glitch free, but you have to carry a reciver battery with this set up .

you can see it size not to bad.

Wingman,

Thanks for the info. What plane is that in the pics?


Andy

Slow rider A EL BEE. 48 inch Wing.

so its all or nothing, WOT or dead stick.... might make for intresting landings

Geez! How much current are current will those microswitches take?









-Matt

Not 50 amps continuous without melting!!

I pulled some out of an old 3 phase instantaeous Hot Water System ages ago & they were rated at 25Amps AC @240 volts.
At under 12V, 30-50 Amps for short periods might work.
Phil

I think it would be a bit safer to just use some MOSFET's to switch the load....no, it is not very hard

All you need is a resistor per FET and a grounding resistor to ground for the whole group. You could then use your switch(even a very small one would work) to apply current to the bases and turn your motor ON.






-Matt

Remember, there are many folks in this hobby who do not know the first thing about basic electronics - this prohibits many exisiting wet-fuel modelers from trying electric. Some models even come with a wiring harness and a switch, and instuctions on how to connect this to a servo to turn on the motor!!
..a

Just take a look at what your car starter motor takes to switch about 200A...and see how its dine.

IMHO the weight disadvantages of a mechanical switch outweigh the efficeincy loss on a MOSFET, and frankly, a brushed ESC is not much more expensive than a servo and a relaible switch, and receiver battery.

Everything old is new again?? We used to do this sort of thing, many years ago before ESCs were as good as they are now (small, light, fairly inexpensive, good BECs and other features).

For 15 or 20A you can get away with a setup like that for some time. Sooner or later the switch will die. Been there, done that.

At 50A I'm surprised the switch doesn't weld itself together in the on position the first time you use it. A switch that's big enough to actually take that load and switch it safely (remember you WILL be switching the startup current of the motor) is large, heavy, and not cheap.

"At 50A I'm surprised the switch doesn't weld itself together in the on position the first time you use it."

Get in, sit down and shut up, were going for a ride!!

I think we have stated our feelings about this very well.

Wow a lot of Ideas Well it Handles 50 amps at 7.2 volts all day no problem it is rated at 5amps 250volts A.C. they bag a lot. as far as weight yes it is a disadvantage. it is cheap though 3bucks for the switch 14 for a micro servo. .Cheers

Ummm, are you 'sure' your hitting 50 amps with that setup (measured) ???? That setup sure doesn't look like it will unless I am blind (could be I guess...) BTW just because you have a 50A ESC doesn't mean it will be pulling 50A. All it means is the ESC will 'handle' up to 50A.