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-   -   Speed Calculator (https://www.rc-monster.com/forum/showthread.php?t=2259)

SnoopMaxx 11.15.2008 02:26 PM

3906 with 2.5r drive shafts all around ... snaps like twigs :oh:

2 x 6cell 4000mah battīs
Need 3.3 drive shaft and diff ... would that be enough ?

brushlessboy16 11.15.2008 02:47 PM

i dont think the 2.5's or the 3.3's will be enough.. you might need somehybrid diffs for 6s, and definatley get steel idlers for the trans

SnoopMaxx 11.15.2008 02:55 PM

How ībout on 4s ? or is that to low volt ?
I only have two 6cell NiMh battīs at the moment

Iīd like to get a few set of A123 cellīs
I heard they were safer compared to some LiPoīs

brushlessboy16 11.15.2008 03:45 PM

Quote:

Originally Posted by SnoopMaxx (Post 232990)
How ībout on 4s ? or is that to low volt ?
I only have two 6cell NiMh battīs at the moment

Iīd like to get a few set of A123 cellīs
I heard they were safer compared to some LiPoīs

4s you would still need a driveline update, A123 are technically safer then lipos, but as long as you have some common sense lipo's should be fine.

SnoopMaxx 11.15.2008 03:52 PM

Thankīs :great:

Jabe 11.22.2008 02:50 PM

How about, in "motor selector" there is vehicle weight, but is it lbs or kg or something else??

brushlessboy16 12.02.2008 01:14 PM

If your willing to add Then cen matrix Tr, the diff ratio is 2.8888888 9/26.

Spur gear is 66t stock.
:intello:

BrianG 12.02.2008 01:31 PM

Quote:

Originally Posted by Jabe (Post 235067)
How about, in "motor selector" there is vehicle weight, but is it lbs or kg or something else??

Sorry, I guess I missed this question. Anyway, it's pounds.

Quote:

Originally Posted by brushlessboy16 (Post 238154)
If your willing to add Then cen matrix Tr, the diff ratio is 2.8888888 9/26.

Spur gear is 66t stock.
:intello:

Yeah, I can add that.

Looks like it's time for a small update. Before I go making the changes and FTP'ing everything back up, are there any other additions to make (mainly ratios and the like)?

Byte 12.02.2008 01:35 PM

Just wanted to say that that whole site is great, it even helped me on school today! :lol:

I didn't knew what the teacher meant with Parallel and in Series, he couldn't explain it good to me, but after seeing some things on that site I get it :yipi:


The only thing that could be better is more cars in the Speed Calculator.. ( More Diff ratio etc. )


- Patrick

BrianG 12.02.2008 01:39 PM

Lol, glad it helped, although I never thought it could be used as a teaching aid! :smile:

I add ratios for any car I have or am thinking of getting. Then, I add any ratios people submit. However, the ratios have to be tooth counts of the two (or more) gears, rather than the final ratio. Posted ratios are typically rounded and introduce errors in the final calculation. So, I use the tooth counts, do the math (keeping high precision), and only round the display value. So, if you have any of that info, feel free to post it!

And as a side note: I am currently working on another similar project for Mike, so any additions will help him in the long run as I will be borrowing much of the data from my site.

lutach 12.02.2008 01:48 PM

Brian,

Your calculator is awesome. It was dead on with the speed I got from my BPP truggy. Great job.

BrianG 12.02.2008 01:49 PM

Glad to hear it! Just curious, was it the theoretical max speed, or the adjusted speed?

lutach 12.02.2008 01:57 PM

Quote:

Originally Posted by BrianG (Post 238179)
Glad to hear it! Just curious, was it the theoretical max speed, or the adjusted speed?

That was the one that was dead on, 46mph.

Arct1k 12.02.2008 01:59 PM

Do tell - what is the project? How can we all help?

BrianG 12.02.2008 02:10 PM

Quote:

Originally Posted by lutach (Post 238188)
That was the one that was dead on, 46mph.

Lol, that was an either/or question. Was it the theoretical top speed (no drag estimates figured) OR was it the drag adjusted speed. :lol:

Quote:

Originally Posted by Arct1k (Post 238190)
Do tell - what is the project? How can we all help?

I'll have to ask Mike how much he wants publicly known first. I do know he said it was ok to get user's input on the various vehicle data. I am currently putting together a google docs spreadsheet to easily gather this data instead of sifting through posts (and we all know how topics tend to stray). I will add in what I already know and then post the result for others to add.


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