Mojave Is My ESC Fan Installed Upside Down?

[Joker715]

I think my ESC fan motor was in upside down. Air should be blasting up on both right? Not down towards the motors?

 

[332_RC]

Down on both.

 

[Dan B.]

No, down on both.

 

[Joker715]

Down on both.

Really? Why is that?

No, down on both.

Why is that?

 

[Dan B.]

Really? Why is that?

You can see the “fins” on the ESC heatsink when you remove the fan. The fan blows down through them to cool the ESC.
Same scenario with the motor, sans heatsink on smooth can motors. But many motors are also finned, acting as a heatsink of sorts.
Someone on this forum actually tested the fans both ways awhile back, and found that the ESC wasn’t cooled as well when the fan was blowing away from the ESC (up) and the motor was barely cooled at all with the fans blowing away from it. I remember it being said “if you’re hot, do you want the fan blowing on you or away from you?”

 

[Joker715]

You can see the “fins” on the ESC heatsink when you remove the fan. The fan blows down through them to cool the ESC.
Same scenario with the motor, sans heatsink on smooth can motors. But many motors are also finned, acting as a heatsink of sorts.
Someone on this forum actually tested the fans both ways awhile back, and found that the ESC wasn’t cooled as well when the fan was blowing away from the ESC (up) and the motor was barely cooled at all with the fans blowing away from it. I remember it being said “if you’re hot, do you want the fan blowing on you or away from you?”

Thanks for the info man. I'm clearly a rookie here lol

 

[Dan B.]

Thanks for the info man. I'm clearly a rookie here lol

We all were! The fun is in the learning!

 

[hobo]

Thanks for the info man. I'm clearly a rookie here lol

god help you with other things in the hobby then its so obvious that fans need to blow on to the motors jesus christ man

 

[Joker715]

god help you with other things in the hobby then its so obvious that fans need to blow on to the motors jesus christ man

Go fu*k yourself pussy. Fuckin keyboard warrior

 

[Chapinb]

Not always that obvious. If the fan is sealed/ducted directly to the heatsink, like most esc, blowing up might be viable. Logically, all the air moves past the cooling fins either way, right? Bonus, it would push hot out out of the chassis rather than in. In practice, blowing works better.
If its not sealed, we'll then yes, it's a little more obvious. Fan blowing on you vs away illustrates that perfectly. Pushing the air causes a uniform column of flow, you can feel it. Pulling, air isn't sucked in by a column but enters from primarily the sides. Tis why you feel almost no air flow on the backside of a fan.

Just pointing out the op question was valid, otherwise why would someone spend time testing.

 

[Garcbomber]

I don’t know about you guys, but I prefer to be blown off instead.

On a Mojave with full body coverage, the most important thing is to bring in fresh ambient air while moving. Restricting with fender skirts and nets just compounds the need for supplemental air intake to adequately cool electronics.

 

[Joker715]

This is my first R/C car ever. I don't know anything about them.

 

[Garcbomber]

This is my first R/C car ever. I don't know anything about them.

You definitely picked the best one to learn from, enjoy

Pick up an infrared temp laser gun and check your temps sporadically to gather an understanding on ambient and loads while running.

Research and learning on the fly is the way to go

 

[Chapinb]

This is my first R/C car ever. I don't know anything about them.

No worries. If you have a question, search it first - most common questions have been asked. But if that fails, or you don't understand an answer, ask! Aside from a few bums, most members here willing to help.

 

[332_RC]

Yeah man. Ask away. Keep learning. I've been in RC a long time & I've learned tons here. The IR gun really helped me.

 

[hobo]

This is my first R/C car ever. I don't know anything about them.

only joking pal we all got to start somewhere I suppose

 

[Joker715]

only joking pal we all got to start somewhere I suppose

 

[hobo]

Not always that obvious. If the fan is sealed/ducted directly to the heatsink, like most esc, blowing up might be viable. Logically, all the air moves past the cooling fins either way, right? Bonus, it would push hot out out of the chassis rather than in. In practice, blowing works better.
If its not sealed, we'll then yes, it's a little more obvious. Fan blowing on you vs away illustrates that perfectly. Pushing the air causes a uniform column of flow, you can feel it. Pulling, air isn't sucked in by a column but enters from primarily the sides. Tis why you feel almost no air flow on the backside of a fan.

Just pointing out the op question was valid, otherwise why would someone spend time testing.

the fan needs to blow onto what ever your trying to cool down

 

[Dan B.]

I think I’m gonna like this guy.

god help you with other things in the hobby then its so obvious that fans need to blow on to the motors jesus christ man

Way to encourage and help out a noob!

the fan needs to blow onto what ever your trying to cool down

There really are a lot of applications where fans extract hot air, not blow it away. It wasn’t the silliest question I’ve ever heard.
My personal favorite was the guy asking if he had to de-solder the LiPo’s he soldered together in series before charging them, or if somebody had a trick to do it because, “I know Raz Shifrin isn’t desoldering his LiPo’s every time he needs to charge them.”
He didn't realize the battery harness was connected with 8mm bullets, he thought the LiPo leads were soldered together. WOW. That, my friends, is some scary sh’t right there…

I don’t know about you guys, but I prefer to be blown off instead.

View attachment 391768

On a Mojave with full body coverage, the most important thing is to bring in fresh ambient air while moving. Restricting with fender skirts and nets just compounds the need for supplemental air intake to adequately cool electronics.

The age old question, to suck or to blow?

 

[332_RC]

I think I’m gonna like this guy.

The litmus test is positive. All is normal.