RC4WD Excavator

[doodlebug]

Hey Joe, you are way ahead of me on radio's now! Still learning.

Rob, thank's for the short lesson on brushless motor's, No idea about those at all. Gotta get past the standard rs 540 motor's, LOL!

I'm looking forward to finding out the pro's & con's of the HK hoe. Thank's for sharing!
Later, Neil#2 aka doodlebug.

[CustomRCmodels]

Wow Joe ,
You are cooking 14 ga wire with that beast ?
That is some serious amp-draw for a R/C model !
A 14 ga wire carries safe up to 30 amps ( not just 15 )
A 12 gauge wire is rated for about 40 amps
But no matter 20/30 or 40 amps , you are here in a range of a “nuclear meltdown”
If you create a short ! you better watch out handling these kind a loads !
If that included ESC is rated for 125 amps I would guess that the motor pulls like 50 amps , which would explain your wire-cooking .
Also explains why they recommend a 6500mah battery ,
( which would last only for about 15 minutes if that motor really pulls 50 amps )
that is some serious power , **** you could jump-start a real car with that !
You usually only find this in serious R/C racing .
If you don’t have an amp meter do this :
Instead using a car-battery , which supplies some serious amp-rating ,
Use a few of your NI-CD or NI-MH batteries , wire them in parallel to get a higher amp-rating and then measure the time you can run that beast .
Example : 4x 2000 mah batterys = 8000 mah capacity ,
you are running for 20 minutes = 8000:20=4000mah= 40 amps !

about the wire-cooking and amp-rating , the wire-length is also a factor ,
that’s why in serious R/C racing you keep all your wiring as short as possible ,
since in most cases the wire-size is actually undersized for the actual amp-draw of the motors.

You should use some fuses in your wiring for all this testing .
You could use some ordinary house-wring fuses .
Best would be the standard automatic fuses , the once you can reset , or also called circuit breakers. Start out with a 16 or 20 amp and if it pops right away get the next bigger one .
That would be also a simple way of testing the actual amp-draw .

I just looked at the specs of that motor ( after I already typed all the above )

· Rotational speed: 380 (kv) RPM/volt
· Input voltage: 11.1-29.6V
· Max efficiency: 98%
· Custom cut shaft or Earth Digger
· Continous current: 80A
· Warrenty period: 30 days

That is one weird designed brushless motor !
Amp-draw 80 amps , but only 380 rpm’s per volt ? at 12 volt that would be about 4500/rpms ….??? but an 960 Watt motor ( at 12 volts ) ??
A higher rpm motor with a gear-reduction would be here a much more efficient setup .
Assuming that these above motor specs are correct

What rpm motors do the other guys supply ? like Stahl and Leimbach

Makes me almost get one of these beasts and check it all out , lol

[CustomRCmodels]

Originally Posted by CustomRCmodels

............explains why they recommend a 6500mah battery ,
( which would last only for about 8minutes if that motor really pulls 50 amps )
( 6.5 x 60 / 50 = 7.8 ) ...............................
Use a few of your NI-CD or NI-MH batteries , wire them in parallel to get a higher amp-rating and then measure the time you can run that beast .
Example : 4x 2000 mah batterys = 8000 mah capacity ,
you are running for 20 minutes = 8 x 60 / 20 = 24 amps !

sorry guys , had a little glitch here in my numbers this morning