Rc4wd gru 2:1, 3:1, 4:1

[rockwerks]

Has anyone tried one of these for those who have direct drive setups and have to fast of RPM motors to run in some classes.

I sold one to lonewolf and maybe should have held onto it.

http://rc4wdstore.com/index.php?cPath=61

[Darin Jordan]

Has anyone tried one of these for those who have direct drive setups and have to fast of RPM motors to run in some classes.

Dude.... I just sent you a PM... Get back to me as soon as you can... I have some questions about this item and would like to talk about it...

Thanks!

[Steven Vaccaro]

Dude.... I just sent you a PM... Get back to me as soon as you can... I have some questions about this item and would like to talk about it...

Thanks!

Looks like just what the doctor ordered Darin!

[ace028]

I have seen these on ebay before, looks promising! Keep us informed!

[rockwerks]

I have seen these on ebay before, looks promising! Keep us informed!

Rc4WD has been making these for a few years now, the first units had issues with gear mesh, not the case now. I ran one in a super class crawler for awhile and had no issues truck weighed around 10 lbs. Ive never ran one at high RPM's but maybe Ill pick one up again and test in and N2 offshore stepped hull

[crazzy maxx]

rc4wds products are very durable in my part... lol
i think it should work...

[Flying Scotsman]

Brian and Darin, I am at a loss here...why a gearbox..please explain the advatages for FE boats. I run true scale boats and I understand the benefits of ratio to drive? Or do I?

Douggie

[rockwerks]

Brian and Darin, I am at a loss here...why a gearbox..please explain the advatages for FE boats. I run true scale boats and I understand the benefits of ratio to drive? Or do I?

Douggie

Like this if you have a motor that is running a bit over what you need for proper prop speed a GRU unit will decrease the output RPM and increase the torque. hence the ability to swing a bigger prop without an increase in amp draw and hopefully higher top end.

[Spot Me 2]

It states right in the discription not for brushless motors. I like the idea though. If you try it out, keep us posted on how long it lasts.

[rockwerks]

It states right in the description not for brushless motors. I like the idea though. If you try it out, keep us posted on how long it lasts.

mainly because of the 5mm input of most brushless motors. its really no different than running with any other type or transmission IE: buggy, truck, crawler etc.

[Ub Hauled]

hmm...

[old guy]

Just my 2 cents I have 6 crawlers and a lot of my parts are RC4WD they are second to none. But CRAWLING is slow going FE is flat out, some crawling motors are 85 turn most use 50ish. RS4WD does not recommend them for brushless I believe for the high RPM. I would send them a e-mail be for I spent my money on one. I know nothing about FE bot I know e-mail is free and gear boxes are not.
The Old Guy

[Darin Jordan]

Just my 2 cents I have 6 crawlers and a lot of my parts are RC4WD they are second to none. But CRAWLING is slow going FE is flat out, some crawling motors are 85 turn most use 50ish. RS4WD does not recommend them for brushless I believe for the high RPM. I would send them a e-mail be for I spent my money on one. I know nothing about FE bot I know e-mail is free and gear boxes are not.
The Old Guy

This is excellent Advice... I've e-mailed Mike and he said that their units are tested with Brushless, but he doesn't think they will last very long since they "don't have bearings"... Not sure what that means, exactly, but I've e-mailed with some follow-up questions...

I'd like to see the inside of one of these, so if anyone has any pictures, could you please post them?

Their site has this pic, which kid of gives you an idea of how they accomplish the gear reduction:






The warning on their site says this:

Important note: this product is designed for regular 540 brushed motor, its not designed to run on high power brushless motors! It will work, but it wont last a long time.

It looks like it's all bushed, and that there aren't any bearings in there... Not sure what a "long time" is considered. I'm guessing that, due to the smallish gears in there, it's not possible to fit bearings, otherwise it might have them??? Will have to get one on the bench to find out for sure...

I think I'd skip this for most applications. We have enough power in most cases to power direct-drive anyhow... If you MUST use a geardrive, then a Hughey or Fine-Design set would be more appropriate I would think...

[rockwerks]

Just my 2 cents I have 6 crawlers and a lot of my parts are RC4WD they are second to none. But CRAWLING is slow going FE is flat out, some crawling motors are 85 turn most use 50ish. RS4WD does not recommend them for brushless I believe for the high RPM. I would send them a e-mail be for I spent my money on one. I know nothing about FE bot I know e-mail is free and gear boxes are not.
The Old Guy

already done. if its a bearing issue, thats a non issue. bearings are cheap

[Ub Hauled]

Rock,
I think what they mean is there are NO bearings in the unit, we have to figure out first, if the gears can actually take the kind of RPM we are looking for (I think so since they are stainless steel) and second if there is a possibility to place bearings in it and how simple it is (in case frequent replacement is necessary).