Scale Speed... how do you convert it???

[norbyx]

It might be sound a stupid question. But how do you calculate the scale speed of a truck??? I mean if the truck is 1/10 scale you can't consider a 1/10 speed would be correct.
I mean for the slow part it might be like that because at very slow speeds you can actualy have a similar speed to a 1.1 truck but at hi speeds everything changes... For example a summit that hits 30mph cant be converted to 300mph if it was really a 1.1 right?
Never seen a slash hit 600mph....
so how do you convert it??? Any ideas?

[dub599]

did you eat paint chips as a kid?

[JeremyH]

v=d/t

Which of those variables do you think is supposed to change when you are referring to a small car or a large one?

[wanantrdsc]

f=ma

[wanantrdsc]

oops, pv=nrt

[norbyx]

Originally Posted by dub599

did you eat paint chips as a kid?

Nop did you???

and all the other post could you please be a bit more clear?? Not an engineer here....

[romulus22]

Originally Posted by wanantrdsc

oops, pv=nrt

you forgot to carry the a over from the g so the correct formula is

pav=gnrt

[JeremyH]

Originally Posted by wanantrdsc

f=ma

Originally Posted by wanantrdsc

oops, pv=nrt

[engineerjoe]

Speed is simply time over distance so, yes it is that easy
there are some things to consider when comparing RC's to their 1:1 counterparts.

power to weight ratio:
a slash 4x4 has approximately 3 hp (200A*11.1V) and weighs ~6 lbs with battery. That is 1 hp/2 lbs.
for a pro-4 truck to have that same ratio it'd need to have 2000 hp (or weigh 1200 lbs)

[JeepinOR]

Originally Posted by engineerjoe

power to weight ratio:
a slash 4x4 has approximately 3 hp (200A*11.1V) and weighs ~6 lbs with battery. That is 1 hp/2 lbs.
for a pro-4 truck to have that same ratio it'd need to have 2000 hp (or weigh 1200 lbs)

Is this the answer to the question the OP was trying to ask?


Of course, if it's a matter of simply over complicating things - if the question really was about speed, there's no conversion necessary. If a rig is doing 2 mph on the rocks or tearin' ass down the street at 30mph, it's still either 2 mph or 30mph.

[jcboof]

I understand what you are saying, but in all things being equal speed is speed.

Now if the actual time and distance was in scale with the truck, a 10th scale truck going 60 mph on a scale track would in theory be going 600mph.
Your 1.1 mile would equal 1/10 of a mile in scale terms. And in 1.1 terms the mileage would be 10 miles. In order for a 1.1 to cover 10 miles in 1 minute it would have to be going 600mph to complete 10 miles in one minute.

So in theore with everthing being in scale then yes. Your 1/10th scale truck going 60mph would in fact be traveling at a scale speed of 600mph if it had to cover the actual 1:1 distance of one mile.

Now that I've confused everyone.. If anyone could clarify what I'm trying to convey, please feel free to! LOL!

[Grizzly4x4]

Originally Posted by jcboof

I understand what you are saying, but in all things being equal speed is speed.

Now if the actual time and distance was in scale with the truck, a 10th scale truck going 60 mph on a scale track would in theory be going 600mph.
Your 1.1 mile would equal 1/10 of a mile in scale terms. And in 1.1 terms the mileage would be 10 miles. In order for a 1.1 to cover 10 miles in 1 minute it would have to be going 600mph to complete 10 miles in one minute.

So in theore with everthing being in scale then yes. Your 1/10th scale truck going 60mph would in fact be traveling at a scale speed of 600mph if it had to cover the actual 1:1 distance of one mile.

Now that I've confused everyone.. If anyone could clarify what I'm trying to convey, please feel free to! LOL!

engineerjoe,JeepinCA, and jcboof are all correct.
The difference in your answer though is what is the speed relative to? Is it relative to a global coordinate system, a person standing next to the track.
Or is it relative to a local coordinate system; the car or a person sitting in the car.


If the speed is relative to the car (or the "driver" in the car) then yes, a 1:10 scale RC car going 30mph would be the same (relative to the drivers) as going 300 mph in a 1:1 car. Because the 1:1 car would have to travel 10 times the actual distance of the 1:10 scale car to be traveling the same mph.

If the speed is relative to a person standing beside the track then there is no conversion. A 1/10 scale toy car passes by at the same 30 mph as a 1:1 car. Also because the 1:1 car and the 1:10 car are covering the same relative distance. Relative to their scale.