Doing my Homework for Twin Mamba Monster flux. - Page 2 - RC-Monster Forums

nuz69 · 05.04.2010, 05:20 AM

The motor eats the amp he need ! that mean big load = big current, and big truck, big gearing = big load.
Maybe the ICE is less efficient than the HV ?

Jahay · 05.04.2010, 05:28 AM

why do you say its less efficient? Wouldnt it be better considering it can handle higher amps???

nuz69 · 05.04.2010, 05:29 AM

Maybe electronical architecture is different... Or maybe you can program more parameter in the HV 140 ?

Jahay · 05.04.2010, 05:40 AM

i will do some searching into it.. .At least i know what i need to do now... May need to look at alternative gearing again going to 8s... but i will see...
Thanks nuz and neil!!

DCastaneda · 05.04.2010, 11:48 AM

The Neu/Castle 1520 should be able to handle 10s no prob. Same difference as running 6s on the Neu/Castle 1512 2650kv but on a larger can.

nitrostarter · 05.04.2010, 12:00 PM

Correct. If you are trying to run high speed runs, making 1 or 2 passes at a time, then these motors can take the abuse at the RPM limit and even over the limit.

Keep in mind Nic Case ran a 1521/1Y on 12s powered by a Phoenix HV110 in his world record run. That was also a single pass, not on or off road bashing.

Any continuous usage, I would recommend staying around the 40-45k rpm MAX.

I would go for the ICE HV-160 if you can. The added amperage and the data logging abilities are quite nice.

DCastaneda · 05.04.2010, 12:05 PM

Yup, this is based on speed runs only. I will be running a Neu 1518 1.5Y on 12s and will probably eventually bump up to the 1521/1Y or the Castle/Neu 1520 equivalent. Shooting for some kind of record

Jahay · 05.06.2010, 08:14 AM

Ok a few things... need a little advice and confirmation...
As you know iam going to try an 8s configuration... to keep things balanced, in the truck,
I am going to buy 2x2s and one 4s lipo. And place the 4s in the centre of the chassis and the 2x2s either side in battery boxes by kershaw.... I will be using bullets and was wondering if it is ok to connect them this way...

Also im not sure if im going for the HV any longer as i am a little worried it will over heat as it will not get the same air flow like it would on a plane... Or is this not the case..???

This was brought to my attention and the ESC in the link below has a built in fan which should be more suitable right?

http://mgm-compro.com/index.php?tid=...-boat-z-series

Does anyone have any experience with this item or no much about it???
THANKS

Overdriven · 05.06.2010, 08:40 PM

The wiring diagram you posted is correct, as it keeps everything in series. As far as the ESC, if it doesn't have a fan, add one. There have been other users here using the castle (and other manufacturers) airplane esc's in ground vehicles before. Sometimes with a fan, sometimes not

simplechamp · 05.06.2010, 09:59 PM

When you do your calculations it is better to use ~3.7V for the cell voltages. Under load they won't be holding at 4.2V/cell even when fully charged.

suicideneil · 05.07.2010, 10:01 AM

^Ditto.

MGMs are great escs, reported to be very smooth, but they are ( arguably ) way overpriced and a frickin' nightmare to programme correctly, even with all the extra cables that are required. I'd say stick to a boat/ plane esc and mechanical brakes, or have patience and wait for Castle's new 1/5 scale car esc. Otherwise, look into the Kontronic Jazz and Jive escs perhaps- even Lutach might have something suitable in the way of HV escs...

Overdriven · 05.07.2010, 11:10 AM

^ there's always schulze too.

Curious as to synching two motors though. With two esc's is it necessary?Because it's really two separate systems driving the same spur, as long as the settings are the same I can't see them fighting each other. I mean once spinning a little the esc's know their motors position from the emf feedback, regardless of one motors position to the other. I tried a dual vxl setup on a erevo without synching and had no problems.

Semi Pro · 05.07.2010, 03:44 PM

Quote:

Originally Posted by Overdriven

The wiring diagram you posted is correct, as it keeps everything in series. As far as the ESC, if it doesn't have a fan, add one. There have been other users here using the castle (and other manufacturers) airplane esc's in ground vehicles before. Sometimes with a fan, sometimes not

i dont use a fan on my hv110, in a truck it gets alot more air than it would in a plane.

the hv110 runs alot cooler than the MMM does in my revo

suicideneil · 05.07.2010, 04:45 PM

Quote:

Originally Posted by Overdriven

^ there's always schulze too.

Curious as to synching two motors though. With two esc's is it necessary?Because it's really two separate systems driving the same spur, as long as the settings are the same I can't see them fighting each other. I mean once spinning a little the esc's know their motors position from the emf feedback, regardless of one motors position to the other. I tried a dual vxl setup on a erevo without synching and had no problems.

A suitable Schulze esc would cost a pretty penny I bet..

You're right about the syncing issue though, it isnt required as such, its just a nice idea really.