RC-Monster Forums - Speed Calculator

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

Quote:

Originally Posted by BrianG (Post 264463)

Since I rely on submitted data for much of the ratios listed, I ptobably got the incrorrect info from someone, or just made bad assumption(s). Sometime soon, I will sit down and compile a list of changes for the next update.

Sounds good, the speed calc is an invaluable tool, that is for sure. Thanks for keeping it current!

Hey Brian, the Proline Switch tires i am using on my Slash have got a diameter of 4.3". It would be nice if you could add them to the Proline 2.2 Rim section when you do the next update.

What about the 3 speed trans by savage? ;)

Quote:

Originally Posted by lincpimp (Post 264453)

Hey Brian, you have the incorrect ratio listed for the savage trans...

Well it is not correct for the X model...

The output gear is 29t, p/n 86098

And the gear that drives the output gear, on the center shaft is 32t, p/n 86084

So that ratio is 32/29, so 0.90625

You have 30/31 listed for the secondary reduction (which is actually not a reduction in the x tranny)

Now the 1st and 2nd ratios look to be correct, but I checked anyways.

Input gear cluster, p/n 86097, is listed as 18-23t. The 1st and 2nd gear "spurs", p/n 76914 & 76924, are 44t and 39t repectively. So that looks good.

So 1st is 18/44 and 32/29 so 2.444 x .906 = 2.214
2nd is 23/39 and 32/29 so 1.695 x .906 = 1.535

Those figures are rounded, and I know your program does not round the same. But you get the idea.

Are the figures you listed for the original savage 25 tranny? I will have to pull up a manual to see...

Just checked the savage 21 manual and it is identical, save for a different number for the 39t gear... Same ratios though

Arrg! All those numbers. Let me paraphrase:

The savage X tranny has a 29T output gear on an 32T idler for a 0.90625:1 ratio. Then, there is no 30/31 gear set in the savage X. But, the first/second gear cluster is correct. Is this right?

As far as the flux goes, what is the correct ratio? There are a couple threads and I don't feel like comparing them to get the right gear tooth counts. I saw the scan someone posted, but it really doesn't tell me anything.

And for the 3-speed savage tranny, post the gears and I'll do my best.

Quote:

Originally Posted by BrianG (Post 266211)

I could not find any savage tranny that has 30/31 gears in it. Correct ratio is .90625:1. Yourr 1st and 2nd gear cluster numbers are correct.

Quote:

Originally Posted by lincpimp (Post 266212)

I could not find any savage tranny that has 30/31 gears in it. Correct ratio is .90625:1. Yourr 1st and 2nd gear cluster numbers are correct.

So, the other savages just have in input gear, idler, and output gear? I can't remember all the details, but the 30/31 was something someone told me. I remember that because I thought it was odd.

NVM, I think I have it figured out.

Actually, if there is no 30/31 gears in any of the savages, what are the ratios for them?

Update:

- Added Proline Switch (Slash) tires to the Proline 2.2" rim section for the tires.

- Changed Baja spur gear pitch is Mod 1.5. Thanks to RCM forum member doo540 for this info.

- Alphabeticalized tire list.

- Added a BL Parameter Comparison page which graphically displays the effect that gearing, motor kv, and voltage play in speed, temps, and current draw. In BETA right now for user input.

- Removed Savage transmission ratios until I get the proper gear tooth counts.

Play around with the new page ("BL Parameter Comparison" under the "Other Stuff" section). If it seems confusing or isn't right, I'll just remove it.

That was quick, thanks!

I think the Brushless Parameter Conversion is a nice tool but a bit to abstract. In my opinion it would be nice if you could put the dropdown menu from the Top Speed Estimator where you can select the different motors under the Motor KV column. I would also add a scale from 5V to 50V to the Voltage culumn. Then i would set that for example the green range of Feigao motors ist 27k rpm - 33k rpm. And if you now are for example selecting a Feigao 8XL, the voltage controller jumps to around 15V.
I think the Gearing column is just nice how it is now, it depends too much on vehicle type, tire size, estimated speed, the place where you are driving around and so on.
I don't know if it can be realized or if it's worth spending that much of your time on it, but that are just my ideas. I hope you can understand what i'm trying to explain :)

Yeah, I too think something is missing, but not sure what. I don't want to add "absolute" values (like voltages or motor rpms) because it is intended to show the relative effects on speed/temp/amps from varying the input parameters. Its intent is to give someone a general feel for how a setup operates, not to suggest a setup. So, in that sense, it is supposed to be abstract. I dunno, I might just remove it.

Quote:

Originally Posted by BrianG (Post 266261)

Ah, ok. Maybe you could just split the result column in three singe columns: Temperature, current and speed. And if you then for example select the lowest motor kv and the highest voltage together, the amps and the temperature are low but the speed is normal. That would show the advantage of going HV quite well. Just another idea.....

Brian:

The Savage Flux tranny is 2.2153:1 based on the following internal gears, 44:18 and 29:32.

Quote:

Originally Posted by skellyo (Post 266269)

Brian:

The Savage Flux tranny is 2.2153:1 based on the following internal gears, 44:18 and 29:32.

Correct, those are also the same ratios for the 1ST GEAR in the 2 speed savage x, 25, ss kit, and all other savage trannies that have a 2 speed.

Brian 2nd gear was correct in your calc for the 2 speed savage. Just the second ratio in the tranny. (idler to output) was wrong. I have no idea where the 30/31 came from, but it is wrong.

Is there any chance you can make the "export values" feature compatible with the Opera browser? I don't think I could ever change...

Maybe he got that from a savage 3 speed. It seems to be a little different any way.

Uploaded update:

- Fixed the export values for Opera.
- Savage tranny ratios are sorted out (hopefully)
- Fixed a couple of dead help window links.