Added option for more fans to the BEC & Wiring page...

Pretty cool!

Added the dimensions for the various motors where applicable on the Miscellaneous Data page...

It just keeps getting better and better :027:.

Thanks MM!

If you see something that is incorrect or missing, please let me know. I grabbed what I could from the LMT, BK-Electronics, Castle, and Neu websites, so things might have changed since they published their values.

hey when using the calculator and coming up with voltage for li-po would it be 3.7 or 4.2v per cell? thanx
phil

3.7V. It wont be @4.2 since your going WOT when trying to get up to top speed.

I use 3.5 usually, for a best-case approximation.

Added LST tranny ratios, LVC diagram to the wiring page, and a couple other small changes.

Someone requested entries of these 18th scale vehicles:

- Associated RC18T/MT/B
- Associated RC18MT PRO
- Kyosho mini Inferno ST
- Kyosho mini Inferno ST PRO
- Xray M18MT
- Team Losi Mini-t

However, I don't really feel like looking up the various tooth counts for these, so if anyone happens to know any of them, let me know and I'll add them.

Link is in my sig...

I try to base it on the type of cells and sytem. I ussually use 3.7 myself.
Not saying it is totally accurate. But then again. It gets you in a close
guesstimate.

What I usually do is get a best-case speed and a worst-case speed.

To get the best-case speed, I use 4.2v/cell for the lipo and the maximum ballooning I think would be possible. Also, if I know it, I also use the unloaded motor kv value.

To get the worst-case speed, I use 3.3v/cell for lipo and no ballooning. Again, if known, I use the loaded motor kv value.

Either case will be wrong, but you know your speed has to be somewhere in the middle, probably a little towards the best-case side.

Very cool - Thanks for the LST stuff and the tech support on the calculations too. Keep up the nice work. It is definitely appreciated.

No problem. I have to make sure it's full-featured now that it's a stickie! :)

I was looking at the web referrer stats for my site and noticed that it's making it around to a few other R/C forums: www.lstforums.com, 30486.rapidforum.com, and www.maximummt.com. I thought that was kinda interesting for something just pieced together...

I know I 've linked the Calculator a few times over at lstforums.com:) Very interesting though with maximummt.com. Is it a Canadian site?

Don't know really...

Brian... How come I dont see the slipperential in the speed calculator as a transmision option? Can you add it?

EDIT:OK forget it .... I'm retarded. Its there.

yup.. it's there for sure.. well hidden in a roll-down menu.. :p

It even has the rcmonster.com in front of it to.

I just tested My setup with your calculator and a radar gun:

Gorilla racing G2R
18/51
9XL
Mamba Max ESC
4s LIPO
proline bowtie 40 series tires with wabash wheels (5.8", according to proline)
Emaxx tranny half tranny conversion
revo diffs

according to your calculator, it showed 30.65MPH at 3.7v per cell, radared it today at 30MPH (doesn't do decimals) with a bushnell radar gun, so i guess you're calculator is set very good, now it looks like i can run setups with confidence

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).

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?

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

Bye:018:

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. :)

The Lipo hookup page should help a lot of people understand how Lipo packs are built. Here's an idea, though - maybe duplicate the single pack selection to show how to add two packs in series.

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

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

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

Bye:018:

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

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

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 ??

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.

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.

After a certain speed, wind resistance starts to become a serious limitation. Unfortunately, without all the aerodynamic figures from all the different vehicles, it is extremely difficult to factor this in.

For a while, I was toying with the idea of calculating in some type of speed derating after a certain speed, but don't know what I should use. A MT will have a steeper derating than a pan car so it would still be quite difficult. I ended up not doing it so people can get a more accurate ideal calculation. Although I did add in a disclaimer on the "top speed" page:

That is phat brian. I like the new page.
You not trying to make others look bad are you. ;)

Thanks!

What do you mean by trying to make others look bad??

I agree, when my T4 was being speed tested with a 3s lipo and a mamba max 5700, it was a little windy and even with a tailwind, my T4 would flip at 40 to 45 no matter how I pulled the trigger

It was a joke brian.

Oh. :) I was just confused. :confused:

Does anyone have a decent AVI showing tire ballooning? I want to use it in the R/C calculator and turn it into an animated GIF. I can crop out unecessary parts of the "movie" as needed...

I don't know if this will help, its from serum's website (look at the top, there are some vids)

HERE

Bye:018: