Speed Calculator - RC-Monster Forums

MetalMan · 01.15.2007, 10:31 PM

crazyjr, did you factor in any tire ballooning? It looks like the approximate speed is so accurate because you accounted for tire ballooning by putting in a higher voltage (the cells are probably closer to 3.5v).

BrianG · 01.16.2007, 12:49 AM

OK experts. I added another section for lipo wiring. It's in "beta" stage, so you can't access it from the menu and some parts may not be fully done. I just want to know if this makes sense and will be of use. If so, I'll finish it up.

It also looks like I'm going to have to come up with a new menu scheme since the text links are getting too wide. Maybe a menu system something like this for bling? (my old home page. Don't laugh, it's old and hasn't been updated in a REALLY long time). Or should it stay simple?

01.16.2007, 01:04 AM

I think you should dress it up with some carbon fiber. Maybe some rc-monster logo's somewhere? Just a thought...

Bye:018:

BrianG · 01.16.2007, 01:35 AM

OK, I can dress it up somewhat, but I don't want to make it look "busy" or hard to read with complex background images, especially patterns like CF. Maybe if I faded it so it was lighter...

BTW: I just uploaded an update for the lipo page. It appears I named a function to a built-in function and there was a clash. Fixed now, and works better. :)

crazyjr · 01.16.2007, 02:22 AM

Quote:

Originally Posted by MetalMan

crazyjr, did you factor in any tire ballooning? It looks like the approximate speed is so accurate because you accounted for tire ballooning by putting in a higher voltage (the cells are probably closer to 3.5v).

No i didn't, just factored 5.8"diameter according to Proline

BrianG · 01.16.2007, 11:08 PM

OK, new version uploaded with the final lipo page. Whole new menu system and minor changes to layout as well.

@cemetary gates: I used both CF and the RCM logo. Although it did take a while to wipe out the background...

@MM: I used some of the code from the BEC & Wiring page to show how to connect multiple packs. I hope this is sufficient.

As usual: R/C Calculations

01.16.2007, 11:16 PM

Looks really good!:027: I'll have to bookmark the new version...

Bye:018:

jhautz · 01.16.2007, 11:18 PM

SLICK!!! I like it! Its looking as good as the info it contains now!!!

pinolelst · 01.16.2007, 11:34 PM

A bug IMHO..I tried inputting values for a xxx-t 2.43:1 tranny ratio 16 tooth pinion and 86 tooth spur 11.1 volts (3s lipo) mamba max 7700 kv motor and got a warning that my motor might overheat due to a 40k rpm limit on brushless motors and no top speed estimate was given...castle rates their motors at 65k and even then I'd exceed that but rather than get a warning and no output why not have the warning and give the user the option to proceed with the top speed estimate??

We all know there are a few of us who throw the warranty cards away in the interest of destructive testing for empirical data for the masses :005:

hope this helps

pinolelst

crazyjr · 01.17.2007, 12:06 AM

Quote:

Originally Posted by pinolelst

A bug IMHO..I tried inputting values for a xxx-t 2.43:1 tranny ratio 16 tooth pinion and 86 tooth spur 11.1 volts (3s lipo) mamba max 7700 kv motor and got a warning that my motor might overheat due to a 40k rpm limit on brushless motors and no top speed estimate was given...castle rates their motors at 65k and even then I'd exceed that but rather than get a warning and no output why not have the warning and give the user the option to proceed with the top speed estimate??

We all know there are a few of us who throw the warranty cards away in the interest of destructive testing for empirical data for the masses :005:

hope this helps

pinolelst

click on the ok in bubble and it will show the values. BTW your combo with 4.2" tires(off road) is 81.76 MPH

pinolelst · 12:24 AM

Quote:

Originally Posted by crazyjr

click on the ok in bubble and it will show the values. BTW your combo with 4.2" tires(off road) is 81.76 MPH

Silly me didn't think to scroll down :007: :007:

Was waiting for another pop up window to give me the estimates :007:

LOL

Thanks

pinolelst

edit:A friend of mine clocked it at 55 mph with a cheap bushnell gun but I suspect he shot it from an angle and not straight on so I could assume 60 or so but 81 mph ??

BrianG · 01.17.2007, 12:40 AM

Thanks jhautz! I like the interface better too. Although, this started as a single page and it sorta grew as I just tacked on more stuff. It did need an overhaul.

Quote:

Originally Posted by pinolelst

A bug IMHO..I tried inputting values for a xxx-t 2.43:1 tranny ratio 16 tooth pinion and 86 tooth spur 11.1 volts (3s lipo) mamba max 7700 kv motor and got a warning that my motor might overheat due to a 40k rpm limit on brushless motors and no top speed estimate was given...castle rates their motors at 65k and even then I'd exceed that but rather than get a warning and no output why not have the warning and give the user the option to proceed with the top speed estimate??

We all know there are a few of us who throw the warranty cards away in the interest of destructive testing for empirical data for the masses :005:

hope this helps

pinolelst

Thanks for the feedback! First of all, crazyjr is right, it will still figure out the values, it just warns you that the rpm is over the recommended limit.

Next, which page was this in?

If it's the "top speed estimator" or the "solver" page, then you have to select the motor from the list because there are seperate max rpms based on manufacturer ratings. If you type in "7700" the program uses the baseline 40k rpm as the limit. The program does not try to look up a matching motor since that would be a possibly incorrect assumption. I just tried it by picking the MM 7700 motor and it said it exceeded the 65k rpm limit, which is correct. But it still displayed the results regardless.

If it's still giving you something you don't think is right, post a screenshot of the error along with the values chosen and I'll see what I can do to correct it... or at least explain it.