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Old 03-07-2013, 09:29 PM   #1
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Default rc dragster questions.

Alright. I have some questions on an rc dragster. First what is used as far as braking. The idea I get is there is full throttle applied before taking off then a flip of a switch on controller launches car. Am I wrong or do you rely solely on gearing for a quick take off and top end speed.

Also would adding a simple on/off switch to the controller to cut off the throttle output do anything. Meaning in the off position and throttle pulled all the way and then flipped on to launch the car. Would it give it better launch speed or even matter.

The newer traxxas funny car has some options on the controller, how exactly does the functions work? Anyone able to explain all of this to give me more of an idea, I'm heading in the direction of nodding a controller with a switch to have like a power braking option or whatever you would call it.
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Old 03-08-2013, 04:53 AM   #2
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One last thing, how many channel receiver would be best. If it matters. Will be running a gyro also.
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Old 03-08-2013, 05:54 AM   #3
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In EP the motor via the esc is the break.
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Old 03-08-2013, 05:58 AM   #4
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Not sure what your saying?
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Old 03-09-2013, 05:18 AM   #5
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he said the electric motor in a electric car is the brakes.
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Old 03-09-2013, 09:48 PM   #6
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Well back in the day we used switches for brushed motors as they were the most direct way to get power from the batteries to the motor and we would use the same switch method to electrically short the motor which would cause the braking action. Today it is all about brushless motors and the speed control handles all the power delivery and braking. You only need 2 channels, 1 for steering and the other for the throttle/brake.

I am assuming that you were inquiring about an electric dragster.
Look at the IMDRA website and perhaps the MHRA is still around as well.
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Old 03-10-2013, 10:20 PM   #7
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yes, electric dragster. will be brushless and lipo powered. im just lost or confused as to where the take off speed comes from or if there was a trick to it. i know gearing can change take off and top end speed and such. just when i think about it, when the lights say go and u pull the trigger. seems there is quite a bit of a delay on the trigger pull. the traxxas model has like 3 settings or something, thats why i asked if a switch was part of it where you could hold the trigger in and flip it for the quick reaction rather then the slowed down pull of the trigger. hope im making sense.
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Old 03-10-2013, 11:02 PM   #8
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Quote:
Originally Posted by tyhodge07 View Post
yes, electric dragster. will be brushless and lipo powered. im just lost or confused as to where the take off speed comes from or if there was a trick to it. i know gearing can change take off and top end speed and such. just when i think about it, when the lights say go and u pull the trigger. seems there is quite a bit of a delay on the trigger pull. the traxxas model has like 3 settings or something, thats why i asked if a switch was part of it where you could hold the trigger in and flip it for the quick reaction rather then the slowed down pull of the trigger. hope im making sense.
That Traxxas stuff is just full of gimmikcs. Don't read into too much of what they do. You won't have any acceleration problems with a "real" rc dragster. Its' more likely you won't have nearly enough traction to deal with the power. Now this sounds like you are not very experienced with electric RC so don't take this the wrong way but you are likely getting in way over your head. The kinda power you will be dealing with can be very dangerous. It would be a really good idea to visit a racing event so you can ask a lot of questions directly with an expert one on one. People have been Drag racing RC cars for well over 20 years and there has been a ton of development over that time. What Traxxas has come up with is simply a scale representation of a full size Funny Car and they have introduced the so called launch control is once again just a gimmick to add some realism to the experience but I can assure you that they have more than enough power to take off like a bat outta you know what without any gimmicks.
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Old 03-11-2013, 12:01 AM   #9
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see, i didnt know if that setting was needed or even used on built dragsters. ive watch so many videos and they all just pull the trigger and go basically. then this traxxas thing came out and confused me on if there was some other trick to the take off of it. im far from new with electric. thats all i mess with. im working on building a 1/32 scale funny car right now and just wanted to see what i needed to do as far as mod wise if any at all. ill play around with gearing and see what i can come up with as far as realistic take off and top end speed. im wanting it to look pretty scale and hopefully be in the 55-70 mph range. (large gap, i know. 55 is easy to hit with a modded micro-t. will be less weight so could be more speed, which is where i have large gap range in mind, lol)
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