Rocket Fan Wiring Help!!!

[954kevin]

Hey! I have a Kraton 6s EXB v2 as some may already know. I bought a dual 40mm fan assembly from Campfire Carbon and a couple 40mm Rocket Fans from Surpass Hobby.

The dual fan adapter from Campfire Carbon included a fan splitter cable. This cable has 3 pins/wires per side going into a single 3 pin/wire that I assume I plug into the ESC.

However... the Rocket fans only have two pin/wires. So, my question is, can I just plug the two pins from the fans into the 3 pin connector on the splitter? Like, the 2 pin fan connector slides right in to the 3 pin connectors(on only two of the three pins obviously). Here is a couple pictures. I assume this will work fine, but thought I would ask someone with more fan knowledge than myself! I see a lot of the thick boi 40mm server rack fans have three wires. I suppose this splitter from Campfire had those in mind and I assume these rocket fans will work just fine running on only two pin +/-.

Thanks for your help and advice!

 

[pomplemus]

You just need to plug the fan into the power and ground pins, red and brown in your case.

As far as I know, these fans are reverse polarity protected, so plugging it in in reverse polarity won't hurt anything, it just won't run.

In general though, pin one on the two pin housing (marked with a little triangle in the molding) is usually the red power pin.

 

[954kevin]

In a fashion that truly personifies me and my life in general, I'm going to answer my own question and apologize of not at least taking a look under the shell before posting this request for help.

Just in case anyone else on the internet find this post while searching for their own answers to a similar question:

Yes, you can just run the 2 pin fans on the 3 pin splitter. The splitter from the factory has three pins/wires while the oem fan has only two.

Again. sorry for not getting off my ass to go out in the garage to have a look at things BEFORE posting here.

 

[954kevin]

You just need to plug the fan into the power and ground pins, red and brown in your case.

As far as I know, these fans are reverse polarity protected, so plugging it in in reverse polarity won't hurt anything, it just won't run.

In general though, pin one on the two pin housing (marked with a little triangle in the molding) is usually the red power pin.

Thanks for the quick reply! I don't have a lot of experience with fans on these models. I have done a couple fan upgrades on my Traxxas stuff, but it was all cut and dry. I assumed this was the case with the two pin wires, but wanted some confirmation. I thought maybe the Rocket fans maybe had a couple variations and I had ordered the wrong ones or something.

I went out and actually looked at the truck(something I should have done prior to posting) and saw two pins living happily with 3 pins.

 

[jkflow]

You just need to plug the fan into the power and ground pins, red and brown in your case.

As far as I know, these fans are reverse polarity protected, so plugging it in in reverse polarity won't hurt anything, it just won't run.

In general though, pin one on the two pin housing (marked with a little triangle in the molding) is usually the red power pin.

Sorry wrong, the middle is positive for many reasons, in RC if you plug in reverse you would damage the signal line (outside orange above) while grounding has no detrimental effect, other than nothing works. More or less a fool proof pinout. Agreed that pin 1 is always marked, but I've seen too many incorrect 3 pin cables that I don't rely on that marking for RC purposes.

These 3 pin headers (in RC) like in your picture
middle is always - positive (+)
black (outside) - negative (-)
orange (usually) signal

I have seen all kinds of colors but middle is always positive and if it doesn't work just flip it around.

For your fans, 2 might be too much for your ESC/BEC and you might experience brownouts, try it out but if you have issues reduce to 1. Rerally depends on the fan and your steering servo.

 

[954kevin]

Sorry wrong, the middle is positive for many reasons, in RC if you plug in reverse you would damage the signal line (outside orange above) while grounding has no detrimental effect, other than nothing works. More or less a fool proof pinout. Agreed that pin 1 is always marked, but I've seen too many incorrect 3 pin cables that I don't rely on that marking for RC purposes.

These 3 pin headers (in RC) like in your picture
middle is always - positive (+)
black (outside) - negative (-)
orange (usually) signal

I have seen all kinds of colors but middle is always positive and if it doesn't work just flip it around.

For your fans, 2 might be too much for your ESC/BEC and you might experience brownouts, try it out but if you have issues reduce to 1. Rerally depends on the fan and your steering servo.

In regards to the brown outs, would one of those Novak capacitors you plug into an open channel on the receiver help to reduce the issue? I forget what they are commonly called... Just a capacitor with two leads you plug into an open slot.

 

[332_RC]

Yes, you can just run the 2 pin fans on the 3 pin splitter. The splitter from the factory has three pins/wires while the oem fan has only two.

That's correct.

 

[jkflow]

In regards to the brown outs, would one of those Novak capacitors you plug into an open channel on the receiver help to reduce the issue? I forget what they are commonly called... Just a capacitor with two leads you plug into an open slot.

You are thinking of the magic 'cap-pack', no won't help. Do not buy cap packs, waste of money for this entry level stuff but look it up on the forum.
Brown out is simply not enough supply (BEC 5A limit), your servo will suck ~ 3-4A when stressed (depends on your type) and not sure about the fans, just a heads up if you loose control when turning and regain it shortly thereafter.

 

[jkflow]

Follow up, you will be running the fans on 5V (BEC) your current will be lower but also the fan output.

40mm Rocket: Max Voltage:
8.4v (2 cell lipo)
Current 0.6A
---
Highly suggest to already buy some spares, but from direct china for a lot less. Look for 4010 metal fans.
Lead time is longer but good to have spares, you will eventually loose some fanblades from debris etc.

$6,71 for the ones you have. Make sure you select the right version.

https://www.aliexpress.us/item/3256...hQ8cRPLI&utparam-url=scene:search|query_from:

 

[954kevin]

Follow up, you will be running the fans on 5V (BEC) your current will be lower but also the fan output.

40mm Rocket: Max Voltage:
8.4v (2 cell lipo)
Current 0.6A
---
Highly suggest to already buy some spares, but from direct china for a lot less. Look for 4010 metal fans.
Lead time is longer but good to have spares, you will eventually loose some fanblades from debris etc.

$6,71 for the ones you have. Make sure you select the right version.

https://www.aliexpress.us/item/3256804246087378.html?spm=a2g0o.productlist.main.77.3310e1b5IzzM8C&algo_pvid=5baeb41e-89e3-44f9-8d9d-43a2240f81a3&algo_exp_id=5baeb41e-89e3-44f9-8d9d-43a2240f81a3-38&pdp_npi=4@dis!USD!6.28!6.28!!!6.28!6.28!@2101eab017344661638567897ec636!12000029164293079!sea!US!3295500491!X&curPageLogUid=NCb9hQ8cRPLI&utparam-url=scene:search|query_from:

Appreciate the link! I did actually order some from Ali, but they shipped me the 30mm in black when I had ordered 40mm in red. So, I returned them and just ordered a set of eBay.

 

[pomplemus]

Sorry wrong, the middle is positive for many reasons, in RC if you plug in reverse you would damage the signal line (outside orange above) while grounding has no detrimental effect, other than nothing works. More or less a fool proof pinout. Agreed that pin 1 is always marked, but I've seen too many incorrect 3 pin cables that I don't rely on that marking for RC purposes.

These 3 pin headers (in RC) like in your picture
middle is always - positive (+)
black (outside) - negative (-)
orange (usually) signal

I have seen all kinds of colors but middle is always positive and if it doesn't work just flip it around.

For your fans, 2 might be too much for your ESC/BEC and you might experience brownouts, try it out but if you have issues reduce to 1. Rerally depends on the fan and your steering servo.

@jkflow you are absolutely correct regarding three-pin headers, power will always be the middle pin so reversing the direction doesn't hurt anything, just grounds the signal pin.

However, in my post I was talking about the two pin connectors on the fans.

On most of the rocket RC and clone fans I've seen, both the power and ground wires are black. Normally however, the power lead is plugged into pin 1 on the two pin housing.