Does the Tamiya TT02 have a brake feature?

[EmJayeX]

Hello! 

Im new to the RC hobby, and especially to building/owning a TT02 kit. Long story short, I had an rc truck (low-end, hobby grade) and it turned out to be trash. But it did have a braking feature!

So I was wondering how braking works and whether or not the Tamiya TT02 has that feature as well. Because I imagine even going 20-30mph in a parking lot and then a 1:1 car comes around really quick, braking/stopping would be important. 

Any answers and insight is appreciated

(Tried looking it up with the search feature and either I dont know what the heck Im doing, or it hasnt been mentioned before at all. Only the wheel hub stuff comes up)

[EmJayeX]

Is braking a feature on transmitters/radios and/or ESCs?  

Or is it something else youd have to purchase separately?

Note: My TT02 kit hasnt arrived yet, so I dont know much about electronics.

[markbt73]

Brakes on all electric RC cars are built in to the ESC, there are no mechanical brakes. The TT02 will come with either a Tamiya TBLE speed control or a Hobbywing 1060, both of which have very effective brakes.

[droidy]

... lol what markbt73 said but I've come this far, I'll post ...

The ESC and it's settings control braking. It's a bit like regenerative braking on an EV, where you use the motor as a generator and dump the resulting heat/electricity. (There's some tests out there claiming some escs do real regenerative braking by recharging the battery instead of throwing away the excess energy as heat).

You'll be able to configure whether you want forward/brake (for racing), forward/reverse (for crawling), or forward/brake/reverse (for general use) on a good ESC.

Crawler oriented ESCs will have a drag brake option. That locks the brake on when the throttle is at neutral, so you can stop on a slope and stay in place without rolling away. Normal brake mode has you tap the throttle into reverse for brakes, and either double-tap reverse throttle or come to a stop and then reverse throttle to go into reverse.

Different ESCs have different ways to "detect" braking based on what you do with the throttle. I've never seen a dedicated brake "pedal" channel although fancy crawlers can change gears and lock differentials and so on. Has anyone ever seen an RC "handbrake" option for added fun?

Some motors have a stronger braking force than others? I guess it's related to torque? The ESC will be the biggest contributor to brake force - the stronger the brake, the more energy the ESC needs to get rid of.

You'll be able to configure how strong and sensitive the brake force is in a good ESC although you might need a programming card or box.

I don't know about any transmitters with specific braking features. But you can apply exponential (how steeply the throttle signal ramps compared to physical throttle position) and dual rate or end point (how "strong" the signal is when the physical throttle is at its limit) which could change the feel of braking.

[EmJayeX]

4 hours ago, markbt73 said:

Brakes on all electric RC cars are built in to the ESC, there are no mechanical brakes. The TT02 will come with either a Tamiya TBLE speed control or a Hobbywing 1060, both of which have very effective brakes.

Great! Exactly what I needed to know! Thanks so much!

[EmJayeX]

4 hours ago, droidy said:

... lol what markbt73 said but I've come this far, I'll post ...

The ESC and it's settings control braking. It's a bit like regenerative braking on an EV, where you use the motor as a generator and dump the resulting heat/electricity. (There's some tests out there claiming some escs do real regenerative braking by recharging the battery instead of throwing away the excess energy as heat).

You'll be able to configure whether you want forward/brake (for racing), forward/reverse (for crawling), or forward/brake/reverse (for general use) on a good ESC.

Crawler oriented ESCs will have a drag brake option. That locks the brake on when the throttle is at neutral, so you can stop on a slope and stay in place without rolling away. Normal brake mode has you tap the throttle into reverse for brakes, and either double-tap reverse throttle or come to a stop and then reverse throttle to go into reverse.

Different ESCs have different ways to "detect" braking based on what you do with the throttle. I've never seen a dedicated brake "pedal" channel although fancy crawlers can change gears and lock differentials and so on. Has anyone ever seen an RC "handbrake" option for added fun?

Some motors have a stronger braking force than others? I guess it's related to torque? The ESC will be the biggest contributor to brake force - the stronger the brake, the more energy the ESC needs to get rid of.

You'll be able to configure how strong and sensitive the brake force is in a good ESC although you might need a programming card or box.

I don't know about any transmitters with specific braking features. But you can apply exponential (how steeply the throttle signal ramps compared to physical throttle position) and dual rate or end point (how "strong" the signal is when the physical throttle is at its limit) which could change the feel of braking.

Thanks for the VERY detailed reply! Ill have to see what the stock tt02 esc can do. Thanks again!

[EmJayeX]

4 hours ago, droidy said:

Has anyone ever seen an RC "handbrake" option for added fun?

Thatd be cool, especially for drifting. Though probably not something I would go through the trouble of doing something like that for the tt02 at least 😅

[Alexei]

On 5/6/2023 at 4:12 AM, EmJayeX said:

Thatd be cool, especially for drifting. Though probably not something I would go through the trouble of doing something like that for the tt02 at least 😅

for something like that, there is front one way differentials. works like a hand brake when braking.

[Ziddan]

On 5/5/2023 at 11:47 PM, droidy said:

don't know about any transmitters with specific braking features.

At least the flysky gt3b has a feature they call ABS, its a bit of built in programming which causes negative throttle input to be pulsed, as for how much that does at scale, no idea.

[TwistedxSlayer]

13 hours ago, Ziddan said:

At least the flysky gt3b has a feature they call ABS, its a bit of built in programming which causes negative throttle input to be pulsed, as for how much that does at scale, no idea.

Will give that a try on mine, I've never tried that feature.

[alvinlwh]

.

[Mad Ax]

On 5/5/2023 at 10:47 PM, droidy said:

Has anyone ever seen an RC "handbrake" option for added fun?

as @Alexei has mentioned, a front one-way diff allows for 4wd when accelerating but only affects the rear when braking.  These were popular for 4WD CS drift cars for handbrake initiation.  My Top Force Evo also has a front one-way, although I took it out last time I raced it - it's an acquired taste for buggy racing.

I run my big-rigs with Beier MFUs, which have an optional throttle / brake style configuration whereby moving the left stick up causing the truck to move (either forward or reverse, depending on what "gear" is selected) and moving the stick back always causes the brakes to apply.  I like this when I'm driving a heavy rig on a layout full of expensive, fragile rigs and equipment - it doesn't matter what gear I'm in, if I pull hard back on the stick, it'll stop quickly.

I've often wondered about making a car with separate mechanical brakes, but it's way beyond my skill at 1:10 scale  

12 hours ago, alvinlwh said:

ABS are for engine cars with real brakes, used on motor cars, they will overhear the motor fast.

I may be wrong, but I think some ESCs have an ABS feature too.

[alvinlwh]

.

[droidy]

@Mad Ax sounds like fun!

[Mad Ax]

2 hours ago, alvinlwh said:

Here is the full post with explanation. <snip>

thanks, that makes perfect sense - especially the bit about triggering reverse.

My assumption with ABS in the ESC is that it can somehow compare the braking force (current draw) against the motor rotational speed to determine if the wheels are locking, and reduce the braking force appropriately, but I really just made that up.  Now that I come to search for it, I can't even find an ESC with ABS function (brushless or brushed)

[alvinlwh]

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