View Full Version : Basher RockSta 1/24 Mini Rock Crawler FPV

Roboforcer X2000
31st December 2015, 02:11 PM
I was waiting for a kit version (http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=90525) and as soon as it appeared at HK- grabbed instantly as they're flying off the shelves. I didn't go for RTR version coz I don't like pistol radios and brushed motors, and I'll be rebuilding the body anyway to fit a bigger battery and FPV gear. It will not be as fancy as my 1/8 rock crawler (http://fpvlab.com/forums/showthread.php?31462-ROBOCRAWLER) which I'm getting back to shortly, I just wanted for my 6 yo son to start FPVing. Weather is absolute shite and my 1/8 one has no space to run around the house. ...OK, I'm not gonna fool any of you, we all know who's the biggest child here, it was only an excuse for my wife which called it a BS anyway, obviously:)
As I have 3ish weeks before it is at my door I have some questions for the ones who knows smth about autos electronics. My knowledge in this section is as big as about ballet shoes... The main question is whether I screwed up choosing brushless motors:rolleyes:
Instead of 130 size brushed motors, as equivalent I ordered these- http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9069 and planning to use 2s battery. According to Google, I'll have 3 times more RPM then with 130 size brushed ones. No info on what pinion or it's pitch is on RTR version, or what's the gear ratio, nothing. So I grabbed blindly 9T pinions as they were the only ones to be found quickly that is for 1.5mm shaft- http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15254. ESCs I think should do these ones (got a programming card as well)- http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=23766.
It is not for speed of course, and if my choice of motors are too powerfull then I can limit my throttle via Taranis (and some thr curve), but I really would not want to use 1s as FPV gear needs at least 2s.
For FPV gear- probably IRC Vtx 5.8ghz 600mw, or maybe 3.3ghz system, didn't decide yet. Cam that I have is MiniPZ 5v 600tvl and will stick it on a servo just for tilting up and down. I have Effio-V one as well but it needs 12v minimum and I don't want to start putting all them step-ups and voltage regulators, but will look at that option as well. Taranis with 6ch PWM Rx will do the job, no need for TBS Crossfire LOL
So, me hornies, if you have a thought or two (especially about motor/pinion), plz speak your mind:D

1st January 2016, 07:31 PM
The only thing I would worry about with that brushless set up is how smooth the start up will be. Some of my sensorless Brushless set ups cog a bit and start up a bit harsh. Other than that, this set up looks really cool. I like the MOA axle set up. Similar to a ClodBuster, only its tiny. The other cool part about having separate front and rear motor control is you can do a front or rear dig. Could come in handy on tight crawling courses.

There are a couple benefits to a brushed set up...The start up is smoother and you can run more than one motor on a single speed controller. You just run both motors in parallel.

Roboforcer X2000
2nd January 2016, 08:54 AM
Thanks for joining in bud:)
I like motors on axles as well, simply because is much easier for mods to extend the body. Or to add another axle for 6x6, or another one for 8x8.
ESC users in reviews say that they are smooth on start but of course for a crawler it has to be super smooth. We'll see, I'll mess around with timing and see what best I can get out of them. And I believe a smaller pinion will smooth the start (along with throttle) as well, but let's try that 9T first.

7th January 2016, 05:06 AM
I am doing the same thing with my Basher Rocksta. You are a bit ahead of me so would love to hear how you went with the pinion gears?


Roboforcer X2000
8th January 2016, 04:06 PM
I am doing the same thing with my Basher Rocksta. You are a bit ahead of me so would love to hear how you went with the pinion gears?

Welcome to the Lab!
I chose my pinions blindly, simply because the ones were for 1.5mm shaft:) Can't tell anything yet as it was only shipped out two days ago, so still 2-3 weeks to wait.

11th January 2016, 07:27 AM
I got the kit the other day and the spare parts list says it's an 8T pinion.

Roboforcer X2000
11th January 2016, 02:35 PM
I got the kit the other day and the spare parts list says it's an 8T pinion.
Does it say so in a paper manual? I couldn't find that info anywhere... Either way it's good to know, that means I didn't miss much with 9T and now can start looking for 7T pinions:)

11th January 2016, 07:27 PM
There was a manual in the box with a parts listing on the back page. I will scan it in and post it on Thursday when I am back at work.

Roboforcer X2000
12th January 2016, 11:40 AM
Thanks man, I'd love to take a look before I get mine, maybe I'll get more ideas for mods and prepare for the arrival.

So lets prepare for the arrival, I got my pan/tilt system done:)
On the cam I glued 9gr servo for tilt and for pan I have 180deg servo. LEDs are in GF tubes coz they are illuminating to the sides a bit as well. Otherwise without them horse blinkers I would have a bad glare to cam's lens with LEDs being so close to it.
Bottom plate is not cut yet, I'll do that when I will be rebuilding the frame. The one in the pics is only for testing different positions of them blue dampeners. They're the softest around, but the system has very little weight, so spreading them too much apart not much dampening going on, and too close to servo makes the system too swingy. Anyway, I found their sweet spot:)

http://imagizer.imageshack.us/v2/1024x768q90/911/FN79TZ.jpg (https://imageshack.com/i/pbFN79TZj)

http://imagizer.imageshack.us/v2/1024x768q90/907/SzZ6kj.jpg (https://imageshack.com/i/p7SzZ6kjj)

http://imagizer.imageshack.us/v2/1024x768q90/905/JVPI40.jpg (https://imageshack.com/i/p5JVPI40j)

For more preparation I desoldered my old 3s 850mAh 45C Nanotechs by a cell. I didn't solder into 2s packs yet as I'm not sure whether 2s will be too fast and I'll have to use 1s setup, and I don't have enough connectors anyway. My plan is to mount 2 batteries on each axle as I did on my big crawler so there's weight on axles and more space in the frame. 1.7A total capacity will get me to the moon and back:)

http://imagizer.imageshack.us/v2/1024x768q90/905/juQDSD.jpg (https://imageshack.com/i/p5juQDSDj)

13th January 2016, 11:26 PM
I bought one of the RTR ones for my oldest son (14), gave it to him for his birthday today, its pretty cool, and a lot of fun, pretty sure, I'm having more fun with it than my son, I'll have to get my own. The last car I built was a Tamiya Frog, like 1984ish, when I was around my son's age, so I am a noob with cars/trucks. I might add some FPV, and make it so I can put it on and off pretty easily.

14th January 2016, 12:53 AM
Here a scan of the manual.


Roboforcer X2000
14th January 2016, 06:57 AM
Thanx bro!

Roboforcer X2000
26th January 2016, 04:53 PM
Got my crawler kit at the door, and when started to check them brushless motors for fit my smile disappeared...
Of course they don't fit, that's no problem, but 9T pinions I got don't fit either. There's a slot for 8T pinion to just just about to fit, also 9T's 0.4 pitch is too small, doesn't interlock with the gears. 8T pinions at HK is for 2mm shaft and my motors have 1.5mm shaft. There's one heli pinion that is for 1mm shaft but it is on backorder, as well as brushed motors for that crawler if I want to go for brushed setup.
I'm wiling to do the brushless mods because I have them motors and ESCs, but how to fit on 1.5 mm shaft 2mm pinion without a lathe? Any ideas? I'll check if I can solder on that motor shaft, then I can wrap 0.25mm wire around it and solder, order 8T pinions and press them on. Otherwise I'll have to wait til spare parts appears at HK or brushed motors are back in stock. Either way I won't be driving it any time shortly, but I can start doing body mods.

Flattened edges for 130 brushed motor will house only 12-13mm diameter motor, a bigger one won't fit coz of shock's ball joint:

http://imagizer.imageshack.us/v2/1024x768q90/633/kNULQV.jpg (https://imageshack.com/i/hlkNULQVj)

9T pinion is too small pitch and touches the side of plastic:

http://imagizer.imageshack.us/v2/1024x768q90/907/pBjOku.jpg (https://imageshack.com/i/p7pBjOkuj)

All gears are nylon, no metal anywhere...

http://imagizer.imageshack.us/v2/1024x768q90/903/jd8fk0.jpg (https://imageshack.com/i/p3jd8fk0j)

And here's the size beside 180mm quad, it is tiny, for now:)

http://imagizer.imageshack.us/v2/1024x768q90/905/0xj2dz.jpg (https://imageshack.com/i/p50xj2dzj)

Oh, and to top up my disappointment- my pan/tilt system with cam is too big and too heavy...

26th January 2016, 05:54 PM
I wonder if you could find some nylon pinions that would fit?

So the motor would fit theoretically if you could find the correct pinion?

Is it (brushless motor) longer than stock? Like will it stick out of the housing?

Check this out- Lots of pics of 8 tooth 1.5mm hole pinions. I'm sure you could find one that would work with that motor (if it fits) and that spur.

Roboforcer X2000
26th January 2016, 08:09 PM
Motors fit but will need some housing around them to replicate that shaved-sides diameter of 130 size brushed motor. They will stick out a bit, but there's no obstruction to chassis movement or anything, we're good there.
As for pinions, I'm ordering some stuff constantly from HK so I'll just throw them in, and it is too late for 1.5mm pinions- I enlarged the shaft to 2mm. It is ordinary steel, not stainless, so I was able to wrap around 0.25mm copper wire and solder it to the shaft. When I get the pinions, I'll solder them after pressing on as well and I'll have a solid soldered to the shaft pinions. So, brushless setup it is:)

Roboforcer X2000
28th January 2016, 09:15 AM
Here's them motors that became with 2mm shafts:

http://imagizer.imageshack.us/v2/1024x768q90/911/K5MWiv.jpg (https://imageshack.com/i/pbK5MWivj)

http://imagizer.imageshack.us/v2/1024x768q90/905/Yr0H7x.jpg (https://imageshack.com/i/p5Yr0H7xj)

Some spare parts appeared at HK yesterday, so ordered my 8T pinions for brushless motors, also ordered brushed motors with ESC in case I'll fail with my brushless setup. And I got 1/18 scale wheels to try. They're bigger in diameter and will give me a bit extra speed if I go for brushed setup, coz as far as know brushed setup is very very slow.

Meanwhile, building a body from GF plate. My IRC 600mw Vtx will be at the very bottom and it needs more space so my body will be 16mm longer than original. Here's the set:

http://imagizer.imageshack.us/v2/1024x768q90/905/si0K3b.jpg (https://imageshack.com/i/p5si0K3bj)

Glueing process with some reinforcements:

http://imagizer.imageshack.us/v2/1024x768q90/907/nqIyEd.jpg (https://imageshack.com/i/p7nqIyEdj)

Painted, wheel rims as well. I'll be using red/brown primer as finished paint and will leave it matt as it is:

http://imagizer.imageshack.us/v2/1024x768q90/907/9TdSmR.jpg (https://imageshack.com/i/p79TdSmRj)

Roboforcer X2000
30th January 2016, 08:48 AM
The frame is assembled. There are few reasons why I did a narrower mid section:
1. Vtx fits just right without unnecessary space left.
2. Articulation on original frame was limited by a few millimeters because bottom arms were ramming the body when axle tilted at max. Narrower body with spacers at ball joints gave me extra few mm of axle tilt.
3. Cage-like structure is very strong so I could make it very lightweight. M2 threaded rods with nuts and spacers of course gives some extra weight, so after saving weight on frame I came out with roughly the same weight for bare frame, but much more solid and extra space to fit the gear. So far by the plan:)
4. My ESCs will fit just right between main body and side braces, as I found out that there's no space for them anywhere on the axles.

http://imagizer.imageshack.us/v2/1024x768q90/922/JMlNDT.jpg (https://imageshack.com/i/pmJMlNDTj)

http://imagizer.imageshack.us/v2/1024x768q90/923/4YD3wQ.jpg (https://imageshack.com/i/pn4YD3wQj)

http://imagizer.imageshack.us/v2/1024x768q90/922/eKK1sV.jpg (https://imageshack.com/i/pmeKK1sVj)

Suspension on this bubu is very stiff for its weight, too stiff even after I load dead weight on top, equivalent of my FPV gear and body (or protective cage, didn't decide yet). So when drawing my body plates I tampered a bit with suspensions geometry- I lowered the "Y" arm (dunno proper name for it) 2mm and there's no limiter where it stops when fully down. On original plastic body it was sitting on a box, now I have an extra 5mm of up and down axle travel. Shocks were squished as well- I increased their travel length by 7mm (max what plastic can do) and got them more by angle, as close to the frame as I could. All this softened my suspension a bit. When shocks are fully out, spring has extra ~8mm more length, so to soften to the final happiness I'll start cutting a ring or two on springs, but that will be at the very end when I'll have all the gear on and running.

When shocks are fully out, some of them bend and stuck. I presume that's the reason why originally they're partially squished. As I'll have their full travel, to prevent bending I pressed inside small bronze washers. Now that long bolt lines up spot on:)

http://imagizer.imageshack.us/v2/1024x768q90/922/XbZO7f.jpg (https://imageshack.com/i/pmXbZO7fj)

While waiting for pinions, getting my brushless motors ready, I still want to go for brushless setup:) Cut GF plates to replicate cut-sided 130 brushed motor diameter, pressed on my motors, glued with CA+baking soda:

http://imagizer.imageshack.us/v2/1024x768q90/922/nOHPI2.jpg (https://imageshack.com/i/pmnOHPI2j)

Did I mention that this thing is tiny? Here's a pic of the frame (which is already a bit bigger) in my hand, and my hands are not big shovels:)

http://imagizer.imageshack.us/v2/1024x768q90/924/PEw5h8.jpg (https://imageshack.com/i/poPEw5h8j)

Roboforcer X2000
2nd February 2016, 07:31 PM
Got the rest of the stuff in the post. Soldered 8T pinions on motor shafts, installed them- it works! Now I'll be the cool guy that runs brushless setup:)

OK, back to work, still loads to do. I built another pan/tilt system, much lighter. Same 180deg 12gr pan servo, but for tilt I used 5gr servo instead of previous 9gr, less brackets and cam 2gr lighter than previous.

http://imagizer.imageshack.us/v2/1024x768q90/921/iIEaQS.jpg (https://imageshack.com/i/pliIEaQSj)

Hex nuts were ramming hubs when tightening the wheels, so I cut the lip at bushing area. I thought that there will be bearings, but it's only 2 bushings pressed in.

http://imagizer.imageshack.us/v2/1024x768q90/922/YyeMJy.jpg (https://imageshack.com/i/pmYyeMJyj)

Decided that stock tyres are too stiff for me so cut the center line to separate threads, that softened them a bit:

http://imagizer.imageshack.us/v2/1024x768q90/922/IMyCfh.jpg (https://imageshack.com/i/pmIMyCfhj)

Now I have a rolling chassis. Tested only individual components, wiring needs to be finished. Dunno what is stock's articulation (didn't check before taking apart, was too excited to start modding...), but after tempering with geometry and mods I got ~60deg between two axles. And I'm happy so far with softer suspension- even without the rest of the weight (body/Rx/CP/cam) I can tilt one axle to max and the other stays flat until max articulation is reached:)

http://imagizer.imageshack.us/v2/1024x768q90/924/WQDKVW.jpg (https://imageshack.com/i/poWQDKVWj)

http://imagizer.imageshack.us/v2/1024x768q90/924/eVtukE.jpg (https://imageshack.com/i/poeVtukEj)

2nd February 2016, 07:39 PM
That's pretty cool. I don't think I want to do that much fab work, but I might still try to get a brushless setup running at some point.

Just to let you know (maybe you already figured it out), that with any bushing in the shocks, you are limiting your down travel by the exactly the same size of the thickness of your bushings. That's why I didn't end up making a bushing, because it needs every mm of travel it can get. You could get by that by making longer shafts though obviously.

I like the tire mod which I am sure works better, but softer tires will probably work better in some circumstances, sometimes the stock tire compound works fine though, just depends on what surface you are on.

I also noticed that when tightening the wheels down that it would cause them to bind and drag.
I solved that by just not tightening them to the point that it happened, but I was wondering if there was something I could do to fix it.

So you just shaved down that extra part on the knuckle that sticks out past the bushing, and it allows you to tightening wheel nuts all the way down? Any other side effects? I wonder if that means the total track will be reduced by the same amount that is shaved off? Maybe thicker bushings or spacers could be used instead? Hmm....

Roboforcer X2000
2nd February 2016, 08:29 PM
That's pretty cool. I don't think I want to do that much fab work, but I might still try to get a brushless setup running at some point.
I like this kind of messing but I probably wouldn't do it again either...

Just to let you know (maybe you already figured it out), that with any bushing in the shocks, you are limiting your down travel by the exactly the same size of the thickness of your bushings. That's why I didn't end up making a bushing, because it needs every mm of travel it can get. You could get by that by making longer shafts though obviously.
When drawing new frame I increased shock travel by 7mm, bushing in there is 1mm thickness, so I still have 6mm extra travel:)

So you just shaved down that extra part on the knuckle that sticks out past the bushing, and it allows you to tightening wheel nuts all the way down? Any other side effects? I wonder if that means the total track will be reduced by the same amount that is shaved off? Maybe thicker bushings or spacers could be used instead? Hmm....
The problem there was not the bushings, but that plastic wheel hub that hugs the pin- the more you tighten your wheel the more it sinks in the pin and start touching knuckles. As you need the groves for the pin you can't cut anything there so I cut the knuckle, no side effects, all good.
I'm not sure what do you mean by "the total track will be reduced by the same amount that is shaved off", is it you meant the distance between the wheels on an axle? Either way nothing changed there, pins in the shaft determines wheel's position, everything is there as it was:)

2nd February 2016, 08:42 PM
Yeah by track I meant the distance between the wheels side to side. Good to know it doesn;t mess with that. I'll have to try that mod! It's a pain having to back the nuts off to get the wheels to spin freely every time.

Roboforcer X2000
5th February 2016, 03:34 PM
Finished body/cage, not much left now before ...ehm, maiden?:)

http://imagizer.imageshack.us/v2/1024x768q90/924/DQiFYz.jpg (https://imageshack.com/i/poDQiFYzj)

http://imagizer.imageshack.us/v2/1024x768q90/921/NddW0f.jpg (https://imageshack.com/i/plNddW0fj)

http://imagizer.imageshack.us/v2/1024x768q90/921/JASdaB.jpg (https://imageshack.com/i/plJASdaBj)

http://imagizer.imageshack.us/v2/1024x768q90/921/NC1iOD.jpg (https://imageshack.com/i/plNC1iODj)

http://imagizer.imageshack.us/v2/1024x768q90/924/pWz5Oq.jpg (https://imageshack.com/i/popWz5Oqj)

http://imagizer.imageshack.us/v2/1024x768q90/923/Yj9cx6.jpg (https://imageshack.com/i/pnYj9cx6j)

Roboforcer X2000
12th February 2016, 06:59 AM
Soldered battery packs, I'll have 2s 850mAh on each axle, 1.7A total capacity:

http://imagizer.imageshack.us/v2/1024x768q90/922/32eT1H.jpg (https://imageshack.com/i/pm32eT1Hj)

http://imagizer.imageshack.us/v2/1024x768q90/921/uPu80l.jpg (https://imageshack.com/i/pluPu80lj)

With stock wheels I don't get enough grip on smooth surface so getting ready 1/16 buggy wheels to invert them for more offset. Grinded inside, taped 7mm nuts in, poured some resin, GF plate on top, and more resin on top of that. This way I have GF plate embedded inside resin:

http://imagizer.imageshack.us/v2/1024x768q90/923/QIF8eM.jpg (https://imageshack.com/i/pnQIF8eMj)

http://imagizer.imageshack.us/v2/1024x768q90/921/3yIS9m.jpg (https://imageshack.com/i/pl3yIS9mj)

http://imagizer.imageshack.us/v2/1024x768q90/924/5cSxP4.jpg (https://imageshack.com/i/po5cSxP4j)

The rubber is not soft enough so I drilled loads of holes on both sides and sanded off 3 strips that reinforce the tyre:

http://imagizer.imageshack.us/v2/1024x768q90/923/wL7dkO.jpg (https://imageshack.com/i/pnwL7dkOj)

With stock wheels I could tilt the crawler sideways ~50deg before it tips over, with new bigger and inverted wheels it tips over from 60deg and has much more grip, happy with that:) To get there I experimented with both wheels and weights and glued lead strips inside my new wheels:

http://imagizer.imageshack.us/v2/1024x768q90/923/je3vDQ.jpg (https://imageshack.com/i/pnje3vDQj)

A pic for comparison of stock and 1/16 inverted wheels:

http://imagizer.imageshack.us/v2/1024x768q90/921/qPraK0.jpg (https://imageshack.com/i/plqPraK0j)

And we're done. Got it set, mixed, tested etc, ready to go:) Build overview video is coming very shortly and here's few more pics:

http://imagizer.imageshack.us/v2/1024x768q90/921/qFJKTV.jpg (https://imageshack.com/i/plqFJKTVj)

http://imagizer.imageshack.us/v2/1024x768q90/924/vYWr3R.jpg (https://imageshack.com/i/povYWr3Rj)

http://imagizer.imageshack.us/v2/1024x768q90/921/PZQCa7.jpg (https://imageshack.com/i/plPZQCa7j)

http://imagizer.imageshack.us/v2/1024x768q90/923/dC8R6C.jpg (https://imageshack.com/i/pndC8R6Cj)

Roboforcer X2000
15th February 2016, 08:10 AM
And here's the build overview video:


15th February 2016, 01:42 PM
AWESOME work! That last pic, with the Rocksta up against the Tx, really gives good perspective for how tiny this thing is. Love all the custom fiberglass work! Should be tough enough to handle the inevitable "off road roll" that comes with crawling up and over gnarly obstacles...

Roboforcer X2000
15th February 2016, 02:45 PM
Yeah man, this thing is tiny indeed. My 4yo and 6yo test drivers tested that rollcage multiple times and daddy is still waiting for his turn between battery charges, or when they're in bed:)
On the FPV note- my DomHD2 goggles doesn't fit their small heads, that's the thing I didn't foresee... Once I get FS diversity Rx module (whenever it's out) I'll have existing module as spare to hook on to my HMD. Till then they can enjoy LOS and learn that my Taranis' sticks are not door handles...

Roboforcer X2000
25th March 2016, 07:04 PM
Chopped the video, 2x speed.


10th June 2016, 02:26 AM
Finally got my one going. 10 minutes with the 2yr old and the gears are stripped! Anyone know where to get spare parts?

Sent from my SM-G920F using Tapatalk

Roboforcer X2000
10th June 2016, 04:40 AM
where to get spare parts?
Same place you got your truck:) http://www.hobbyking.com/hobbyking/store/__1998__405__Cars_Parts-Basher_Rocksta.html

11th June 2016, 12:26 AM
Well now don't I feel silly...😃


Sent from my SM-G920F using Tapatalk

10th November 2016, 02:50 AM
Just completed building 1/24 size FPV crawler, video of build and live FPV adventure around my man cave.



18th November 2016, 08:29 AM
Just completed documentation setup page how to convert ROCKSTA BASHER into FPV with complete schematics and parts list for those interested to build. Enjoy building. :)

FPV Basher Rocksta build page: http://www.supermotoxl.com/designs-a-creations/news-a-reviews/594-building-ground-fpv-basher-rocksta-micro-crawler

http://imagizer.imageshack.us/v2/640x480q90/924/ORFiEU.jpg (https://imageshack.com/i/poORFiEUj)

13th January 2017, 12:52 AM
I'm back with another episode of FPV adventure with Basher rocksta this morning. Going into dark alleys of unknown.



16th January 2017, 10:09 PM
How on earth did you get such stable video with all those obstacles? In my experience, 5.8ghz does not tolerate such a busy environment...

18th January 2017, 12:05 AM
How on earth did you get such stable video with all those obstacles? In my experience, 5.8ghz does not tolerate such a busy environment...
I use tuned (build specific for my channel) SPW antenna on my video receiver and also the truck runs on vtx 200mw (bigger Rf bubble) power inside the office so most likely will have clear video in enclosed environment despite on vtx is on omni antenna unless it goes outside the RF bubble.

22nd January 2017, 10:23 PM
Stuck in the office again cause its raining season this month, another office FPV adventure with more encounters of smelly shoes and boxes.