Higher pinions = safer MMM's? Or no? Someone's lying....

[suicideneil]

Ha, so lower gearing is better for the esc- now theres a revelation I didnt believe for a second that using higher gearing was better for the esc on any given voltage, as was suggested earlier.

[J57ltr]

Patricks answer is exactly the opposite of what I asked though.

As far as an external circuit, I am making a clipper circuit that uses a fet that is driven by a Zener in series with a resistor. Once the voltage rises above about 30V it drives the fet on and the load is dumped into a 10 ohm 5 watt resistor (Think I am going to go to a 10 watt though). This is specifically for the motor I use, but I am sure it could be applied in this case as well.

Jeff

Also higher and lower gearing means different things to different people. Higher gearing may mean higher speed (numerically lower) and lower gearing may mean Lower speed (numerically higher).

To me Higher gearing means Numerically low (or shorter gearing) and lower gearing means numerically high (or taller gearing)

[suicideneil]

That just confuses people saying things like numerically higher or lower; why not just say taller gearing or lower gearing, as in gearing up and gearing down, or using a larger pinion or smaller pinion. Plain english = less confusion ( to me atleast, bunch of geeks ).

[J57ltr]

Well I am used to 1:1 cars so I use the terminology that is associated with them. You guys confuse me when you say “I’m running 87/17 in an XYZ”. To me that means nothing other than the ratio between the spur and pinion is 5.12:1 but it leaves out the rest of the gear reduction like the transmission or differential gearing. Like in a rock crawler where you might have a 3:1, in the diff a 5.12:1 for pinion and spur and a 2.72 for the transmission, which would be an overall ratio of 41.78:1. You RC guys are weird I guess.

Jeff

So we STILL haven't gotten a conclusive answer in regards to weather higher gearing with larger pinions = death to ESC's

[RC-Monster Mike]

Originally Posted by Freezebyte

So we STILL haven't gotten a conclusive answer in regards to weather higher gearing with larger pinions = death to ESC's

Here is a quote from this thread made by the owner of Castle Creations (Patrick):

In 99% of the cases, that is exactly true. Smaller pinion = less ESC stress.

Not sure how much more conclusive of an answer you are looking for here? 99% is pretty conclusive in my book. :)

[BrianG]

That's because for a specific vehicle, the tranny and diffs are constant, so only the spur/pinion need to be specified. If someone does do some custom tranny or diff work, then they specify. We're not weird, just lazy and don't want to type what we don't have to.

[J57ltr]

So they gear like Ford then?

Jeff

[Arct1k]

Brian - Effectively that is what the Novak Transcap does if i'm not mistaken...

http://www.shopatron.com/products/pr...ber=5685/135.0

Description

This is a Power Trans-Cap Module for use in high-voltage applications with an input voltage range from 4S to 6S Li-Po. This module includes an 1,800µF power capacitor rated at 35V and includes two transorbs to reduce ESC temperatures and provide protection for the ESC. This module is factory wired with 4 inches of red and black 16-gauge silicone wire, and solders directly to the ESC’s positive and negative battery solder tabs. Module is rated for use with 4-6S Li-Po packs. Exceeding this input voltage will damage the module.

[J57ltr]

Originally Posted by Arct1k

Brian - Effectively that is what the Novak Transcap does if i'm not mistaken...

http://www.shopatron.com/products/pr...ber=5685/135.0

Description

This is a Power Trans-Cap Module for use in high-voltage applications with an input voltage range from 4S to 6S Li-Po. This module includes an 1,800µF power capacitor rated at 35V and includes two transorbs to reduce ESC temperatures and provide protection for the ESC. This module is factory wired with 4 inches of red and black 16-gauge silicone wire, and solders directly to the ESC’s positive and negative battery solder tabs. Module is rated for use with 4-6S Li-Po packs. Exceeding this input voltage will damage the module.

I'm not Brian, but that's what it is and what he was talking about earlier. The cap is there to smooth ripple and the TVS's clamp down on the voltage to a safe level.

Jeff

[snellemin]

Originally Posted by Arct1k

Brian - Effectively that is what the Novak Transcap does if i'm not mistaken...

http://www.shopatron.com/products/pr...ber=5685/135.0

Description

This is a Power Trans-Cap Module for use in high-voltage applications with an input voltage range from 4S to 6S Li-Po. This module includes an 1,800µF power capacitor rated at 35V and includes two transorbs to reduce ESC temperatures and provide protection for the ESC. This module is factory wired with 4 inches of red and black 16-gauge silicone wire, and solders directly to the ESC’s positive and negative battery solder tabs. Module is rated for use with 4-6S Li-Po packs. Exceeding this input voltage will damage the module.

I kinda built my own. I use 2 to 3 caps and two tvs. Single caps still blow a leg off at times.

[J57ltr]

Originally Posted by snellemin

I kinda built my own. I use 2 to 3 caps and two tvs. Single caps still blow a leg off at times.

Kinda's ass you built one!

Jeff

[BrianG]

Originally Posted by Arct1k

Brian - Effectively that is what the Novak Transcap does if i'm not mistaken...

http://www.shopatron.com/products/pr...ber=5685/135.0

Description

This is a Power Trans-Cap Module for use in high-voltage applications with an input voltage range from 4S to 6S Li-Po. This module includes an 1,800µF power capacitor rated at 35V and includes two transorbs to reduce ESC temperatures and provide protection for the ESC. This module is factory wired with 4 inches of red and black 16-gauge silicone wire, and solders directly to the ESC’s positive and negative battery solder tabs. Module is rated for use with 4-6S Li-Po packs. Exceeding this input voltage will damage the module.

Yes, just like that, except turn that single 1800uF cap into 2 or 3 smaller uF caps for better heat dissipation, use 12-13GA wire, and maybe have 3 or 4 TVS devices. Basically beefier for the higher powered setups. Also, it would be nice if Castle had their own to go with their products.

Besides, on the Novak version, $18 is a little steep for 3 cheap devices IMO. That probably can be assembled for under $5, and that's not even counting bulk ordering.

[snellemin]

You forgot that the 18bucks covers marketing, packaging and what not. Not everybody is capable of building one, less where to begin. For those people 18 bucks is a bargain.

[BrianG]

I suppose, but it's really no more difficult than wiring up battery connectors and wiring.