1:8 Robitronic BR 50 Trophy Truck - Brushless

[othello]

@suicideneil
The only thing that bothered me (aside from appearence) while driving the BR50 with buggy tires was its tendency to tip over when cornernering too fast. After another test with my buggy and the same pin tires i can safely say it was primarely due to the agressive tipe of tire thread as my buggy also had tendencys to tip over while cornering: buggy video. There is no tip over on this vid but before i shot this video i managed to tip over the protos buggy too.

br50 chassis with old Mugen pin tires mounted (very agressive tire thread)


This is my buggy tire selection


Sometimes less grip is just easier to drive. That is why i now run my buggy with axial cubes tires. Tire on the right side. They are the smallest one and do look awefull on the br50 chassis with body mounted. But they give good performance.

@DARKWAV
Thanks. i love to play around with my Robitronic 1:8 chassis. I'm glad that Robitronic sells a more scale like car. My quest for good fitting tires with good performance will go on. I hope we will see more scale like bodys for 1:8 cars in the near future. I envy 1:10 car drivers. They have such a huge selection of superbly scale looking bodys. The SC8E kit looks promising.

[shitoba]

Hey there othello, im new here in the forums but i was wondering what type of motor mount you have for your brushless motor. i have a br50 as well and was interested in turning it into a brushless system. Was it custom made or did you purchase it somewhere? Any information would be highly appreciated. thank you. great looking conversions you have though.

[othello]

There is nothing fancy about my motor mount which i made with my dremel tool. It is based on an emaxx motor mount which i cut and drilled to fit in front of the centerdiff. It is screwed onto the centerdiff right where the brake calipers would normally be mounted. It is reinforced with an aluminium angle which is screwed to the chassis plate and the motor mount.

Looks awefull but does its job so far. (mounted onto the protos buggy chassis ... works on the br50 and mantis chassis too)

[othello]

Time for an update of this thread

I am still lovin' the look of the BR50 trophy truck body but underneath it i'm now running the Mantis truggy chassis with truggy tires as my bash spot sort of "requires" more than buggy tires.



Electric components (Neu 1515/1100kv motor, Jazz 55-20-32 ESC and 10s1p A123 cells) and chassis layout remained nearly unchanged. I'm finally using a proper custom aluminium motor mount which enables me to run without "backup" fans over the motor since it can now dissipate heat over a rear mounted aluminum "clamp" to the chassis which acts like a big heatsink. A second big plus of this type of motor mount is that gear mesh of the pinion and spur always remains perfect. I never have to retighten my pinion as i had to with the old motor mount.o

I tested a few tire sets.

Axial Terraizer: I started with the standard tires of the Mantis Chassis.


I made a short video (using a locked center diff) with this tire set
. Due to the locked center diff the car wheeled too much and was hard to drive
. Thise tires are good for bashing but are too wide and bouncy to give precise control of the car which is needed when running on a track

HPI Phaltline
A friend of mine wanted to push his MBX6 buggy to speed so i took the opportunity and mounted HPI Phaltlines and added 2 A123 cells for a total of 12s1p A123 to get more RPM (i was too lazy to mount a bigger pinion)

Here is a video of this testrun
. First off don't take it too serious. I do not intend to make a speed demon out of my trophy truck. I did not make any adjustments to the suspension.
. Asphalt was partly wet and it was freezing cold ... Those tires did not provide good grip but were fun to powerslide until they became unglued (factory glued).

Proline Badlands: cut to fit Proline VTR wheels and using AKA truggy inserts


Here is a video of this test run
. There is a big improvement when it comes to wheelies and ballooning compared too standard mounted badland tires.
. Handling is more precise especially while cornering at high speed. Forward bite remains unchanged and is "beastlyl" on grass.
. Definitively one of my favorite tire set

Proline Caliber VTR: Those are intended for track type of driving


Here is a video of this test run
. I chose the M2 (medium) compound which truely is not suited for actual outside temperatures (2°C or 36°F). Eventhough the soil was partly wet the calibers did not grip well. Rear axle was way too loose and oversteer was hard to control.
. Nonetheless the car felt very nimble. I guess i have to wait until spring to get the most out of them.

[othello]

And for completion: a few days ago after snow has fallen i improvised and made a basic chassis protection to be able to run on snow without worrying too much about the electric components.

Basic chassis protection (quick and dirty made out of duct tape)


AKA City Block mounted on half offset rims


. Sorry no time for videotaping this testrun.
. Off course you would't expect much grip from a rubber tire when running on hard packed snow. And there was no grip ;-) Nonetheless it was fun too watch the snow roosters behind the car when accelerating, making speed passes over the bumps and powersliding.
. Half offset makes the car definitively too wide.