Hi,

What is the highest RPM motor that LEGO makes? with the new power functions servo motor count as a possible option?,

Since they are brushed DC motors they will have a voltage load limit too.

Edited May 4, 201311 yr by SNIPE

Servos arent fast... RC motors, flat 9V motor?

Which 9v motor

Here you can find a motors comparison, by Philo

http://philohome.com/motors/motorcomp.htm

The 2838 rotates at a whopping 4100rpm, but has very few torque.

What would you use the motor for?

I just need the speed, nothing else I still don't know which one is fastest.

This motor is for several projects even ones that don't exist yet

I have three NXT motors, a M motor and a 5x4 stud 9V motor which may not work anymore.

There are more motors than is shown in the link but you probably knew that.

Edited May 4, 201311 yr by SNIPE

Here you can find a motors comparison, by Philo

http://philohome.com/motors/motorcomp.htm

The 2838 rotates at a whopping 4100rpm, but has very few torque.

What would you use the motor for?

Wow that’s an excellent resource for Lego motors.

I just need the speed, nothing else I still don't know which one is fastest.

This motor is for several projects even ones that don't exist yet

I have three NXT motors, a M motor and a 5x4 stud 9V motor which may not work anymore.

There are more motors than is show in the link.

well, from my expeirence, the 5 by 4 is the fastest. I don't suppose you're trying to make a helicopter, are you?

One is a car which has wheels larger than the body which enables it to drive after being flipped over, another is a super light dragster which is made of 14 parts , floor is one brick, two motors connected to the back wheels, two front wheels using one axle and that's it. the battery pack is not on board you just hit accelerate or reverse and it will do it, no wireless transmitters anywhere.

It is to see how fast I can make a lego car go

Edited May 4, 201311 yr by SNIPE

Technically, this motor has highest RPM:

However, it doesn't have to meet your needs because it's terribly, terribly weak. If RPM alone determined speed, this would be a rocked - but it doesn't.

I just need the speed, nothing else I still don't know which one is fastest.

the fastest will stop being the fastest the moment you put it to task. rpm max should be weighed against torque. 5292 has mid-to-high rpm's and is very powerful powerful. the right gear ratio may very well make it the "fastest".

i may be wrong, but i think using philo's values in the following equation should determine for you which motor is potentially fastest:

max rpm / torque.

correction: no, that equation doesn't work. derp! it's in there somewhere, though. i'll figure it out....

even more correction: max rpm X torque should do it. the higher the value, the greater the "fastness" (fastocity?)

KEvron

Edited June 21, 201212 yr by KEvron

You don't want the fastest motor, you want the motor that will make your car go the fastest. These are two very different things. What you technically want is the motor with the most power, because it will be able to deliver torque at the highest rate.

The fastest motor is actually the old 4.5V motor which isn't even listed on Philo's page. It spins insanely fast. However, it would be totally useless for driving a vehicle because it has no power. In general, just look at how much electric power is consumed. The speed you will be able to get out of your car is proportional to that. If you want to do it by trial and error, just mess with the gear ratio externally until the wheels turn as fast as possible while still having enough torque to move the car.

The fastest motor Lego make at this moment is the m-motor. Maybe this new l-motor will have a higher rpm and torque, but, we are not positive yet.

correction: no, that equation doesn't work. derp! it's in there somewhere, though. i'll figure it out....

even more correction: max rpm X torque should do it. the higher the value, the greater the "fastness" (fastocity?)

KEvron

Yah, fastocity (speed).

Edited June 22, 201212 yr by sama

Yah, fastocity (speed).

fastification?

KEvron

Power = RPM x Torque

(aka fastosity)

cheers

Surly

I made a motorised dragster a while ago with just one M PF motor, a IR receiver and a battery box. It had a 24 tooth gear on the motor and a 8 tooth gear on the axle. It had slow acceleration from a standing start but could go fairly quickly if you lifted it up, started the motor and and then pushed it as you dropped it. What i'm trying to get at is i think the XL PF motor could have gone faster if you had the right gearing combination because it has much more torque.

I plan on seeing if i can get a LEGO dragster to go quicker than my old one. I've also been trying to think of a way to measure how quick the LEGO vehicles go. Haven't come up with anything yet.

But the wheels are attaching directly onto each motor so there is little weight for it to handle, the wheels and body is lighter than one motor is.

Edited May 4, 201311 yr by SNIPE

I've also been trying to think of a way to measure how quick the LEGO vehicles go. Haven't come up with anything yet.

you can use a nxt whith 2 line follow sensors standing a meter away from each other so you can callculate the gap in seconds between 1m

How about the speed computer? if you know the final drive peak RPM and the circumference of the wheel you have the speed. this would be peak rather than a average over a measured meter mid you.

I could do that,

the wheels are meant to be light, have small 'sticky' tires and low ground clearance the floor is perfectly flat., there is no sides or top on the body.

Edited May 4, 201311 yr by SNIPE

LEGO speed computer is inaccurate like Hell. And if you think of some astonishing speed record, I'm afraid you may be disappointed. It takes a lot of effort to break 10 kmph with LEGO, and the fastest I've ever seen pure LEGO go was a bit over 20 kmph. These are simple plastic pieces, with lots of friction. They will never get near to what high-end RC cars can do.

there is few lego bricks in the model, there is

2x12 base plate stud-less for the floor, two motors, 4 wheels and two bricks with holes in them for the front axle to go to,the rear wheels connect straight to the motor axles.

battery pack is held by hand the wire is in the air so it does not get ran over.

I think it will go fairly fast, the goal is to see how fast a lego model can go and then try to make it better.

I might not use the lego speed computer in that case but that's a issue for later

Edited June 22, 201212 yr by SNIPE

Some years ago I also tried building a fastest possible LEGO vehicle. More about that can be found on my Mocpage under "Fastest LEGO Dragster" (I can't post a link because I don't have enough posts). I also used some time-measuring device (which uses non-LEGO elements). A laser was alligned as is described at the previously mentioned site, and a NXT-lightsensor and a NXT-G program were used to complete the measurement. At the time I did the measurements, I wasn't able to find any recordings of a faster driven LEGO-vehicle. (However mine isn't remote-controlled)

Power = RPM x Torque

....powerfulness?

KEvron

Edited June 23, 201212 yr by KEvron

....moveinacircularmotionidness?

the wheels are meant to be light, have soft sticky tires and small enough for low body ground clearance the floor os perfectly flat., there is no sides or top on the body.

Bear in mind, also, that the size of the wheel will affect speed too. One single revolution of a large wheel will move much more than a revolution of a smaller wheel.