Speed Calculator

[coolhandcountry]

Originally Posted by BrianG

I'm working on the motor selector and have some questions. I need to group all the 540 can motors by S, L, XL, and XXL size.

Would the Lehner Basics be considered S size?
Would the Lehner Basics XL be considered L size?
Would both the LMT 1940 and 1950 be considered XL size? Or is the 1940 more L size and the 1950 XL size?

Argg! LMT has too many sizes! Better question:
Where do the following motors fall in the S, L, XL (and maybe XXL) size rating?
1920 S?
1930 L?
1940 XL?
1950 XXL?

I have come to a size comparsion. The 1920 is or has the same size rotor as a s can 540.
The L can is 35 x 19 mm rotor.
The xl can is a 50 x 19 mm rotor.
So the 1950 would or should be and xl. IMO
The 1930 and 1940 is another question.

[BrianG]

Added Mugen diff and temperature converter (sorry I forgot about the diff Dafni).

CHC: So, you think a 1950 has the same torque as an XL motor of the same kv? I figured an XL was closer to a 1940. What I ended up doing is made a list of 4 motor sizes (S, L, XL, and XXL) for each motor can size (eg: 540) and equated each level with a vehicle weight range. Then, each motor falls into one of these levels so the program knows which motor(s) to choose based on weight. It seems to be pretty accurate judging by the common setups found here.

[coolhandcountry]

Well the lmt motors run a lot different. The 1950 is real close to xl. It may edge
it out by a knats butt in power. A 1930 will pull a emaxx around pretty easy.
The emaxx weighed in at 11 lb rtr. Shayne ran an emaxx with a 1920 as well.
I didn't have heat issues with motor either. Not sure about shayne.

[Nick]

When I do a speed calculation. Is weight in the equation with the calculator?

[BrianG]

CHC:
So, are you saying the motor selector is not picking the correct motors for the application?

Nick:
The only calculator that factors in weight is the motor selector. I know it seems like there must be a lot of duplication of code on the max speed calc, motor selector, and solver page, but believe me, each one works quite differently because of the focus for each one.

For instance, on the solver, you wouldn't want to figure out how much ballooning you need to achieve a certain speed because you really don't want it. Likewise, you wouldn't want to calculate the motor kv needed based on vehicle weight. Weight affects motor size, not the motor kv value.

The motor selector was intended to help newbies with a starting point for which motor to pick based on other more easily selected parameters.

The motor selector and solver are intended more for initial planning. Use the solver to try a bunch of different scenarios. Then use the motor selector to get a range of motors to use. Finally, use the top speed calc to get an accurate speed rating which takes as many factors as possible.

[Nick]

Where is the motor selector calculator located at?

[coolhandcountry]

Accually no.
The lmt motors just seem more versatile in terms of vehicles.
The lmt motors well run cool when the feigaos are hot and ready to melt.
I got a lmt 1950 geared right tall and would never would have thought the 9xl would survive. Then again I tried it and it didn't make it as well. It got hot faster.
And hotter to.

[BrianG]

CHC:
So, when you say "Actually no", do you mean "no, it's not right", or "no, the selector is not picking the correct motor"?

Nick:
Motor Selector

But, I just went to the site and there is an error loading the library code. I'll have to fix that when I get home tonight. I don't know why it wasn't updated, I FTP'd all the files up at once...

[coolhandcountry]

It was no to your question.

So, are you saying the motor selector is not picking the correct motors for the application?

I couldn't get the motor selector working.

[BrianG]

That makes sense since nothing is working. All of the code that is common to all the various pages has been put into a seperate "library.js" file. This includes code to write the links to the top of the page, various code to build the parameter lists, etc. Without that, everything is broken.

[BrianG]

Ok, I was able to setup FTP in IE and make the fix. Everything is working now. I had forgotten one little ' mark.

[Nick]

Can this be Stickied? I think Brian has put some real good work into this and it's really useful. For it to be a few pages back would be a waste, it deserves to be in a permanent position for frequent access/use.

Just a thought. :)

[MetalMan]

I agree :).

[BrianG]

Wow! I feel honored, my own stickie! :o

I thought it had been deleted at first until I did a search and found it!

[coolhandcountry]

Well I know you put alot in to it brian. I feel you deserved it as well.
Congrats on a stickie.