Robitronic Mantis HV truggy with 10s A123

[lutach]

I really don't want the air and water folks using any my controllers to be honest. I want the controllers to be for vehicles only. I don't fly or swim so if anyone has any questions regarding to that, I wouldn't know where to begin answering them.

[sikeston34m]

As far as driveability, I wonder how well the Kontronik compares to the Quark?

I also wonder if the Kontronik Power Jazz KONM3140 has motor braking and would be compatible in a 1/10 setup. With it's 63 volt/120 amp rating, it looks pretty impressive.

[othello]

Good question. I never used a quark so i can not make a comparision between both ESCs. Maybe Lutach can chime in. I think he used them both. One thing i noticed with the Jazz ESC @ 10s A123: the lowest rpm it can handle in car mode seems to be around 3000 rpm, so the start up is not perfectly smooth. There is a small jump in rpm when you slowly push the throttle from a dead stop. But it is so minimal that you wouldn't notice it in the video. Other than that it never cogged on me and never thermalled.

The Power Jazz has no car mode (no proportional brake). So it can only be used with a braking servo.

[lutach]

The start up on my Jazz was smoother ten with the MM. The PowerJazz seems to work with a pistol radio, but it is ment for aircraft. You will need to get the program card as well to program the PowerJazz.

[othello]

Update: run 5,6 and 7

We had some snow this weekend so i had to wait until today to make some further test runs. Outside temperature @ 3°C (37°F) and my forest track was still wet in 2 curves. That is why the truggy was covered in mud after those runs.



I made 3 complete runs with 3 battery sets.

run 1 (10s1p A123 set 1): complete discharge graph, 1 minute in detail

run 2 (10s1p A123 set 2): complete discharge graph, 1 minute in detail

run 3 (8s2p Konion 1100 set 3): complete discharge graph, 1 minute in detail

remarks:
. I really am happy with the original RTR setup and the balance of the truggy. After braking and steering i do have an easy controlable oversteering. I was used to this when driving my buggy.
. Those Konion lion cells are even able to power this heavy truggy without breaking a sweat. They can't be compared voltage wise to A123 or lipo cells but they make the car less agressive and easyer to drive. Top speed and acceleration is nothing spectacular but they can be used for relaxed bashing. The difference between 1150 and 1450 Watt is impressive when it comes to acceleration.
. Average Amps hover around 14-16A and i use up to 460 Watt average. This cuts driving time down to 9-11 minutes with 2000-2300mAh.
. motor, Esc and battery temperatures remain absolutely uncritical no wonder with this low ambient temps.

I hope it will dry up some more for my next runs.

[othello]

Update: same 11lbs truggy, new motor: Neu 1515/2Y (1100kv) with proline badlands.

After trying different pinions, this now is the crazyest setup i have ever driven. 15t pinion / 52t spur. 12t bevel / 42t bevel. Total transmission ratio: 1:12,13

Here is the video taken while driving on tarmac on a rainy day

This for sure is no reasonable gearing and is too fast for offroad. I was impressed that the electrical components took the punishment (digital driving) without breaking too much of a sweat.

Eagletree graph of the whole run

. Highest Power peak i have recorded since i started this project: 2.6KW
. Up to minute 8.5 i drove on tarmac. The rest was driven on wet gras.
. The motor reached 41°C (106°F) at the end of this run. Ambient temp: 9°C (48°F)

1 Minute on tarmac in detail

. 70-100A peaks on tarmac.
. 20A average = 555 Watts -> 330mAh per minute

Top speed passes

. 30000rpm were reached: theoretically around 42mph (67km/h). At this speed my front wheels do balloon heavily.
. After the first peak, amp draw stays at 45A with a battery voltage of 28,5V equalling 1300 Watt in to stay at top speed with badland tyres on tarmac.

Now it's time to get more reasonable and using a smaller pinion again: 13t or 14t.

[lutach]

That is awesome. I'm thinking of doing something crazy with my Jazz 55s. I'll try it first with my Jazz 40 to see if it'll work.

[suicideneil]

I am rather inspired too- its a nice looking truggy, just needs a custom motor mount and some battery trays; the monster should be able to help I reckon....