RC4WD Excavator

[Espeefan]

Yes, but look at the input voltage. 11.1-29.6 volts. That's pretty normal for an out-runner designed for airplanes or helis. They swing a pretty big prop, or spin the rotor head, usually on 6S Lipo packs. And that's not a small helicopter model either. Almost a .50 nitro sized bird. No doubt that's where the 80 amp current rating comes from. My guess is they sized the motor wrong for the application. At 11.1 volts, the motor isn't at it's most efficient operation, and it's doggy. Probably running less RPM then the Vario out-runner pump motor, at the same voltage.

[CustomRCmodels]

Originally Posted by Espeefan

...My guess is they sized the motor wrong for the application. At 11.1 volts, the motor isn't at it's most efficient operation, and it's doggy. ......

Yes , totally agree with that . Isn’t that dumb , by all these choices of brushless motors they pick that one ? But that would be the only explanation for this weird setup .
Different motor definitely would be the right way to go .
Maybe Joe should install some Heli-blades and send this in to RC4WD as an recommendation for an upgrade / conversion , Lol

Found this link here on a German forum , ( with photos )
http://www.modelltruckforum.com/index.php?page=Thread&threadID=24282&pageNo=2&high light=earth+digger
But so far no posts about any issues or this power/motor/battery question ,
just the usual bla-bla about a new toy …..

There is a Hong Kong seller selling them on German ebay ,
Sold a few and some wrote feedbacks , one also complaint about not enough hydraulic oil , wonder if he experienced the same leaking like Joe .

Searched around some and a little surprised not to find more threads on this model ..??.....

[Lil Giants]

I don't think there is anything wrong with the motor/pump Scott, I'm starting to think that this choice of brushless motor is to coincide with 3s lipo with a nominal voltage less than 12 most of the time.

And you're right as well Steve, the pressure is set much too high! If I hook anything solid with the bucket while drawing the stick towards the cab, the whole model will slide forward instantly without hesitation. This model doesn't have the gvw to handle that kind pressure. I haven't monkeyed with the pressure relief yet, not alot of time for play this wk thus far.

I don't know how using jumper cables would be of any benifit Rob? it's 14ga wire coming out of the esc.

Nathan, Willy; all good info, thanx.

It was the 18ga power cord that was cooking and that happened very quickly after increasing the EPA from 23% to 30% (increased motor rpm). Having the EPA even at 25% was making the 14ga wire warm. Currently I have it set to 20% and that seems to make the pump run plenty fast & the 14ga wire remains cool.

I have an inline fuse on this power cord with a 20amp rating, it never blew with the 18ga, but the plastic housing got so hot that it started to melt & broke connection with the model. I shut the pump off & held the inline fuse holder by hand to keep its shape till it cooled. It still works.

I used the model for a few hrs intermediantly this morning, it worked fine with the 20% EPA on the car battery.

Perhaps on Sunday I'll have some time to figure out how to implement a press guage to see what its really putting out & then adjust it lower for a more feasible operating manor.

Currently, once the pump runs for a minute or so, the flow volume gets pretty quick and makes the hoe somewhat jerky to operate b/c the cyls cylce so quick! Definitely need less pressure. The way it's set might be fine for 3s lipo, but much too high for 13v car battery.