ESC\Motor fan covers. How well do they work?

[Diem Turner]

Sorry for the delay..

So, here's what I've got >
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A. Three different Aero Turbine Shrouds -they'll guide More air into the cooling fan (but will produce couple of more dBs of noise.)

Imagine a jet engine intake.. Basically these will funnel more volume of air into your fan.


B. Speaking of crotchless..


It's more of an A.V.P. (Alien Va***al Protector)

Provides extra protection -Rocks, Grass, Dirt would have to come directly down into the opening to make it to the fan blades.


C. a modified Slanted "Honeycomb Grilled" Fan Shroud.

Angled in a way to "capture" more air and direct it towards your fan(s).


All of these are for standard 40mm fans.
Plus, you can use a sexy piece of pantyhose -to slip over the openings and easily secure it with a rubber band to hold them in place.




Note- Those "checkerboard dots" are not part of the turbine shrouds, they are just extra printed supports that will be removed after final print.

I like the idea of velocity stacks for fan covers as they're supposed to help smooth out airflow into a system as illustrated below. I do have questions as to their effectiveness when it comes to fans as you have a central hub in the middle which kinda messes with what the illustration portrays. It's possible that velo stacks are best used on open pipes such as inlet pipes, manifold or carb inlets, turbo/compressor inlets and the such like. Could be an interesting topic for some A/B comparisons.

 

[Tex Koder]

I like the idea of velocity stacks for fan covers as they're supposed to help smooth out airflow into a system as illustrated below. I do have questions as to their effectiveness when it comes to fans as you have a central hub in the middle which kinda messes with what the illustration portrays. It's possible that velo stacks are best used on open pipes such as inlet pipes, manifold or carb inlets, turbo/compressor inlets and the such like. Could be an interesting topic for some A/B comparisons.
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Your drawing/illustration shows just the initial portion of the process..
If you take into consideration just how close the actual engine/"compressor fan blades" are to the intake AND why most all jet engines have a center spike of some kind to help "guide" the air flow smoothly around the center hub.
That's why you see the "spike"/cone in the middle of aero shrouds.. to keep the airflow as smooth as possible.

And, granted the FASTER the airflow you are wanting to achieve or "to handle" , the Longer the spike...

 

[Diem Turner]

Your drawing/illustration shows just the initial portion of the process..
If you take into consideration just how close the actual engine/"compressor fan blades" are to the intake AND why most all jet engines have a center spike of some kind to help "guide" the air flow smoothly around the center hub.
That's why you see the "spike"/cone in the middle of aero shrouds.. to keep the airflow as smooth as possible.

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And, granted the FASTER the airflow you are wanting to achieve or "to handle" , the Longer the spike...

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You make a compelling argument good sir

 

[jkflow]

.., and compare that spike to the dime sized flat area on any fan out there.

It will still suck in Gras all day long. Efficiency goes out the window with debris blocking the blades. Nice thought experiment but bashing in Gras has its challenge.

 

[Tex Koder]

I'll take some more photos of the actual shrouds mounted on the "complete velocity stack" ,once I sneak home for lunch..

 

[Tex Koder]

Wasn't able to sneak back during lunch..

But, here they are >

 

[jkflow]

Looks like one of those eggs from 'Alien'

 

[Sirkensirlot]

Something like this perhaps?
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Not going down that hole

 

[Tex Koder]

Looks like one of those eggs from 'Alien'

I need to print one of those xenomorph facehuggers to go with it!

Perhaps someone can paint an "ALIEN" themed body ,yes?

 

[Diem Turner]

I need to print one of those xenomorph facehuggers to go with it!

Perhaps someone can paint an "ALIEN" themed body ,yes?

I believe @Tank93 already did.

 

[Tex Koder]

.., and compare that spike to the dime sized flat area on any fan out there.

It will still suck in Gras all day long. Efficiency goes out the window with debris blocking the blades. Nice thought experiment but bashing in Gras has its challenge.

Hence, the slanted shroud design -think of those leaf/debris guards for rain gutters- the "slant" will allow the grass/twigs/debris to slide off and not accumulate on the fans.
Especially if you add a fine window screen material or pantyhose on top for added filtering.

 

[Tex Koder]

I believe @Tank93 already did.

I must have missed that one.


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What I envision is an ALIEN Queen with a bunch of her eggs and several Palatine soldiers guarding her.. with perhaps some Colonial Marines about to attack her Hive...

 

[joshludden]

It's not RC, but I believe the same principle still applies:

https://www.pugetsystems.com/labs/articles/Effects-of-Grill-Patterns-on-Fan-Performance-Noise-107/

Very interesting & informative!! Thank you

Classic Arrma forum, from carbon fan covers to crotchless panties in less than 10 posts...

Just read thru this again, & once again I'm giggling my a$$ off like an idiot, by myself!!!

 

[rcastello755]

Yup on the machines right now. I have like 20 I haven’t added to inventory yet. Just let me know you can have a couple

Lmk im Interested.

 

[parcou]

I must say you all have given me a good read on this post!!

I like all I have seen what I want to stop the most and why I created this post is debris getting in the fans. I cannot stop it all, but mesh or any form of all the examples posted will be better than what I had, nothing.

Now when it comes to the best flow of the air and getting max air, that's next. So far, none of the Game Changer fans or fans I made myself the taller 40mm @Edough13 posted running off a 3S or 2S move, so much damn air has not been an issue. I have not hit thermal cut-off on the Infraction, Kraton, etc., since using those fans...cannot speak for the air efficiency, but it keeps my electronics in the range I want them. Recently, I have been surprised by the power of this tall 40mm fan with just a JST connection...it's not a GC, man it dances on the bench like a GC of ESC HW power...wanted to try supporting our smaller guys. GREAT fan!!

Thx all for a good read

 

[Diem Turner]

I must say you all have given me a good read on this post!!

I like all I have seen what I want to stop the most and why I created this post is debris getting in the fans. I cannot stop it all, but mesh or any form of all the examples posted will be better than what I had, nothing.

Now when it comes to the best flow of the air and getting max air, that's next. So far, none of the Game Changer fans or fans I made myself the taller 40mm @Edough13 posted running off a 3S or 2S move, so much damn air has not been an issue. I have not hit thermal cut-off on the Infraction, Kraton, etc., since using those fans...cannot speak for the air efficiency, but it keeps my electronics in the range I want them. Recently, I have been surprised by the power of this tall 40mm fan with just a JST connection...it's not a GC, man it dances on the bench like a GC of ESC HW power...wanted to try supporting our smaller guys. GREAT fan!!

Thx all for a good read

I'm all about supporting smaller vendors but $31?!?! Yikes...set a few filters on this site and you'll find a lot more options, a lot more air movement at a lot lower prices. I paid $20 each for some NMB server fans that move 36CFM and they've proven to be quite durable. Granted, I haven't been jumping my Infraction but they have survived a number of high speed blow overs.
https://www.digikey.com/en/products/filter/dc-brushless-fans-bldc/217

 

[Adiabatic]

Recently, I have been surprised by the power of this tall 40mm fan with just a JST connection...it's not a GC, man it dances on the bench like a GC of ESC HW power...

Careful running this fan from the ESC BEC. It draws over 1.5A, and you only have 5A to power everything (ESC, receiver, servo, fans). Its current draw is close to the maximum draw I'd be comfortable with from all fans combined.

 

[parcou]

Careful running this fan from the ESC BEC. It draws over 1.5A, and you only have 5A to power everything (ESC, receiver, servo, fans). Its current draw is close to the maximum draw I'd be comfortable with from all fans combined.

...ahh thx...see I'm dumb to the math. Thx did not know that

Careful running this fan from the ESC BEC. It draws over 1.5A, and you only have 5A to power everything (ESC, receiver, servo, fans). Its current draw is close to the maximum draw I'd be comfortable with from all fans combined.

Fans like this would you run on a 2S or 3S battery although it has been made with a JST?

 

[Gernuj]

I run a mojave. What i did was to totally protect the entire electronics bay from dirt and at the same time added an 8mm fan up front to blow air in the bay. I also cover the entire setup with plastic before putting on the body. Result, Zero to no dirt and cool running. I have a post on this: Mojave diy dirt shield and cooling system.

 

[KevinC]

I’ve stopped running fan covers altogether. I feel they do more damage than good.