Speed Calculator - Page 10 - RC-Monster Forums

BrianG · 11.02.2006, 01:04 AM

OK, no one has responded to my questions, so I guess I'll have to make some assumptions.

Anyway, I did a little more work. It's not quite done yet as I still have to factor in the weight variable (tomorrow night's project) so it picks the motor can length (S, L, XL, XXL), but I think I have the layout done. So far, it picks the motor can type (540, 380, etc) from the weight entered and picks motors whose kv value are +/- 5% of the calculated value. Then the program divides the remaining motors by motor quality. Take a look and offer feedback. BETA VERSION.

BTW: The "hard coded" values in there are just to ease my testing. Those will be stripped in the final version. Just override as necessary.

coolhandcountry · 11.15.2006, 07:36 PM

Quote:

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 · 11.16.2006, 12:33 AM

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.

sjcrss · 10.31.2006, 11:35 AM

cool , thanks..

BrianG · 10.31.2006, 01:10 PM

Thanks for the heads-up on the 6XL / 7XL thing. I'll check it out when I get home.

Yes, the page itself is simple HTML, but the code is done in Javascript. I have very little DHTML on there for simplicity. I think the only thing that could be considered DHTML is the help system. My main site, scriptasylum.com, is where I used to create all kinds of scripts, but I got out of it.

Nick · 10.31.2006, 01:38 PM

Very cool. I do alot of PHP myself, never tried anything more than basic Javascript although Ajax is making me want to.

aqwut · 11.02.2006, 10:38 AM

yeah... I would agree with your assumption

coolhandcountry · 11.02.2006, 03:46 PM

The 1950 is like a xl. It has almost the same deminsions. The 1930 is little shorter than l the 1940 is little longer. I think the 1920 is about an s can.

BrianG · 11.02.2006, 03:57 PM

Thanks. So, the 1920 is an "S", the 1930 is an "L", and the 1940/1950 are considered "XL"?

The only reason for this rating system is so that I can choose the appropriate motor for the weight of the vehicle. Heavier ones need more torque, which requires a longer can. I guess I could get away form the S, L, XL, thing and simply go with a number rating system.

coolhandcountry · 11.02.2006, 04:46 PM

The 1940 is kind of inbetween the l and xl. So you can kind of say either.

BrianG · 11.03.2006, 12:00 AM

OK, the final version is up. R/C Calculations

Dafni · 11.03.2006, 03:34 AM

Sweet tool! Very good job, Brian. Thank you.

DAF

Nick · 11.03.2006, 05:17 AM

Very good!

sjcrss · 11.03.2006, 09:15 AM

thanks brian...I like the final version....very easy to navigate thru

BrianG · 11.03.2006, 11:22 AM

Thanks all!

I still am not too sure on the motor selector. See if this sounds right to you:

For choosing the motor size (300 vs 540 can, and then S, L, XL) I am using the truck weight:

If weight < 1.5lbs, use the smaller 300/380 size can. (regular Mamba).
If weight between 1.5 and 5 lbs, use an S size
If weight between 5 and 8 lbs, use an L size
If weight between 8 and 16 lbs, use an XL size
If weight between 12 and 25 lbs, use an XXL size (LMT 1950)

I have some weight overlap for the XL and XXL size, but I wonder if there should be some overlap with the others? I know a smaller motor may work on a heavier truck, but this is for an "ideal" setup.

Then, I use the calculated requried kv value to determine the applicable motors which have a kv that falls near that value.