RC-Monster Forums - here ya go, servoheads

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here ya go, servoheads

I've seen some dumb statements about servos here over the years. Things like, "a buggy needs at least 200oz/in of torque, and a MT needs at least 300"

Hogwash. A servo is a servo. Most high speed/high torque servos are too fast for me. Many are faster than human reaction time, so what are you gaining?

People like to "bench race" and talk about how great their specs are. Well, my spec beats yours.

3200oz/in bee-yatches: http://www.invenscience.com/index_files/Page923.htm

the whole thing abourt bench racing servo specs is not true, it does make a big difference to racers, actaully i tend to tell new guys at the track about 120+ for a buggy and 180+ for a truggy. Honestly I cant not stand to drive a car with slow servos, bashing around its not a big deal but when your racing on the level that a few of us do its VERY important, its controls how the car feels around the track and the faster the servo the better imo.

btw those are some BA robot servos because thats insane did you notice they all run on 12v? Im guessing they would be awesome in a battle bot or somehting like that. have you foun the dimensions yet?

It's one thing to turn the wheels on a stationary vehicle, a Futaba S3003 can do that. The hard part is holding them in the turned position while flying around a corner at 40mph. That is where you need the torque.

I think some people don't understand that. They use a low-end servo and test it with the vehicle sitting in front of them and say, "See, this turns the wheels fine." without realizing understanding how much more work it is to do that while cornering at speed.

Quote:

Originally Posted by rootar (Post 407964)

have you foun the dimensions yet?

r/c size, r/c connector and r/c pwm controlled. Only 90 degree operation with r/c input, but up to 270 degrees with a dedicated controller.

I will say that when hooked to a gyro the faster than humans servos could be quite advantageous. And of course at the track...

Not so sure of rc size - from the website:Dimensions: 5.5 in X 3.9 in X 2.4 in

elsewhere on the site they make a crawler too, http://www.invenscience.com/index_files/Page789.htm

Anyone want to make a brushless version just for kicks?
Quote
"The ZOMBY is a low cost remotely piloted tracked vehicle with very low ground pressure. The internal combustion engine, variable speed transmission and low ground pressure combine for un-matched mobility.
Product Summary

Price: $19995"

Quote:

Originally Posted by _paralyzed_ (Post 407961)

I've seen some dumb statements about servos here over the years.

Me too, very recently at that, like this dude here:

Quote:

Originally Posted by _paralyzed_ (Post 407961)

Many are faster than human reaction time, so what are you gaining?

Sorry man, but what the hell?
What has the comparison of human reaction time and servo reaction time to do with each other? It's not like your thought and the servo turning start at the same point in time and the servos work doesn't "activate" until your thought got to your hands. Yeah, I know it makes no sense, but that's basically what you just implemented.

What a servo with quicker reaktion time gives you is indeed a faster response of your car.
Doesn't matter if the reaction time of the driver is a nano second or a minute.
It's reaction time + all the delays between transmitter and receiver + servo reaction time.
It's completely irrelevant if the driver is a braindead zombie or a fighter pilot. If servo A is 7ms faster than servo B, servo A will have it's job done 7ms earlier than servo B would have. Off course provided both have the required amount of torque.
To get back to your "question", that is exactly what you gain.

If the aforementioned braindead zombie needs that extra bit of faster response is a whole other story.
And on that I'm somewhat with you. I don't need a 0.06ms servo, nor do I want one.
But as rootar does, I can't stand a car with too slow servos either.
Best example: Slash 4x4 stock servo. Yes it turns the wheels, eventually, but that's about it.

Quote:

Originally Posted by JoFreak (Post 407971)

Me too, very recently at that, like this dude here:

Sorry man, but what the hell?
What has the comparison of human reaction time and servo reaction time to do with each other? It's not like your thought and the servo turning start at the same point in time and the servos work doesn't "activate" until your thought got to your hands. Yeah, I know it makes no sense, but that's basically what you just implemented.

What a servo with quicker reaktion time gives you is indeed a faster response of your car.
Doesn't matter if the reaction time of the driver is a nano second or a minute.
It's reaction time + all the delays between transmitter and receiver + servo reaction time.
It's completely irrelevant if the driver is a braindead zombie or a fighter pilot. If servo A is 7ms faster than servo B, servo A will have it's job done 7ms earlier than servo B would have. Off course provided both have the required amount of torque.
To get back to your "question", that is exactly what you gain.

If the aforementioned braindead zombie needs that extra bit of faster response is a whole other story.
And on that I'm somewhat with you. I don't need a 0.06ms servo, nor do I want one.
But as rootar does, I can't stand a car with too slow servos either.
Best example: Slash 4x4 stock servo. Yes it turns the wheels, eventually, but that's about it.

I agree with _paralyzed_, at a certain point the servo speed doesnt matter. Tires are at least 80% of your setup. Also, I would have to guess that most racers(me included) use negative expo in the steering anyway. :lol:

Crawlers need the muscle.

who the hell is this _paralyzed_ guy? And where does he get off spouting such rubbish?

I just saw a servo with crazy specs and wanted to share it. I thought it was normal servo size but I was wrong on that. I should have never turned on the computer this morning!

Their linear servos look cool.

When I finally replaced the servo in my SC10 it made the difference of me running mid pack to fighting for the lead in races. When racing it makes a huge difference when your truck turns when you turn the wheel on the radio, not 1/4 second later

Quote:

Originally Posted by Arct1k (Post 407980)

Crawlers need the muscle.

x2

Anything less than 300 oz and you will be shooting yourself in the foot.

Something as simple as your servo can make or break you in a comp. Having a crappy servo then getting in a bind you find it out quick.

Personally I can't wait for the new line of Hitec CC/Neu based servos to hit the market.

In Soviet Russia servos turn you. :lol:

Quote:

Originally Posted by Erevocanuck (Post 407997)

In Soviet Russia servos turn you. :lol:

:yes::yes::yes:

From my experience I typically go with:
150oz/in at .14 for a buggy
200-250oz/in at .16 for monster truck/heavy truggy
300oz/in at .18 for rock crawlers/VERY large MT's
All with a metal geartrain.

Just my guideline when buyin a servo. Of course my 1/5 scale has it's own requirements.
And SUPER ULTRA HIGH SPEED 6S servos are just overkill IMHO for anything less than a pro racer that gets paid to win,and even then the servo isn't always better.