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my solution to braking fans...
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whitrzac
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my solution to braking fans... - 06.07.2009, 05:21 PM
the 1 blade was broken before, it got cought in the top of the case, caused the esc to thermal


this is after ~2hrs of run time on an almost mudy track... its a good thing its water resistant
   
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BrianG
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06.07.2009, 06:01 PM
I'm confused. The title suggests a solution, but all I see is a problem.
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e-mike
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06.07.2009, 07:09 PM
Quote:
Originally Posted by BrianG View Post
I'm confused. The title suggests a solution, but all I see is a problem.
me too i think the sameso the solution(well i think) is probably that he remove the plastique on the rx8 to prevent more broken fan blade....

D8t on juice!!
   
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Snipin_Willy
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06.07.2009, 07:23 PM
I'm knocking on wood before and after typing this reply:
I haven't had my MMM fail yet but I can see why so many people have. Is there anyone out there willing to mod up a dust filter of some sort? Maybe using a piece of a K&N filter material, or a dust filter from a computer case? I'm sure almost anything is better than nothing.
   
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whitrzac
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06.07.2009, 07:35 PM
removing the plastic that covers the fan, when the fan flexes it catches on the plastic an brakes a blade...
   
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BrianG
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06.07.2009, 09:48 PM
lol, I see now; the fan guard was removed. All I saw was the dirt and broken fan blade.
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blueb8llz
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06.07.2009, 10:38 PM
i have a mmmv1 and i have a solution that works for me. i just put a mesh on top of the fan sorta like a grill. you can use a piece from a aquarium fish net, panty hose, and just other random things you can find around the house.
this has stopped many things that tried to get inside the case.
   
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BrianG
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06.07.2009, 11:13 PM
Or, simply remove the fan.

If it wasn't for that darn no-internal modding clause in the warranty...
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JThiessen
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06.07.2009, 11:32 PM
Brian, you really have no business in a thread on fans.....

Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES
   
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What's_nitro?
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06.07.2009, 11:35 PM
Quote:
Originally Posted by BrianG View Post
Or, simply remove the fan.

If it wasn't for that darn no-internal modding clause in the warranty...
Wow! It took him 3 posts to say it this time!

...And cant you just cut/shrink the power wires on the OUTSIDE of the case, then remove it?
   
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BrianG
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06.08.2009, 09:57 AM
Quote:
Originally Posted by JThiessen View Post
Brian, you really have no business in a thread on fans.....
Maybe, but I like to see what people do to continually use something that really doesn't belong on a R/C...

Quote:
Originally Posted by What's_nitro? View Post
Wow! It took him 3 posts to say it this time!

...And cant you just cut/shrink the power wires on the OUTSIDE of the case, then remove it?
Sometimes the simple answer is overlooked...
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PDM
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06.08.2009, 11:27 AM
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Originally Posted by whitrzac View Post
removing the plastic that covers the fan, when the fan flexes it catches on the plastic an brakes a blade...
You will be lucky if the fan will stay in place.
   
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Snipin_Willy
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06.08.2009, 01:04 PM
Quote:
Originally Posted by BrianG View Post
Maybe, but I like to see what people do to continually use something that really doesn't belong on a R/C...



Sometimes the simple answer is overlooked...
Cooling something that heats up like a CPU can be difficult without using a fan. Not too many options to choose from with exsisting technologies and still have a lightweight system.

Passive cooling: requires a big, heavy heatsink for the amount of heat we need to move.
Solid state cooling: Extra drain on the battery, condensation problems, still requires a heatsink and fan
Water cooling: well....
Is it possible to run Mamba Max systems in parallel to drive 1 motor?

Maybe a more efficient controller with very little energy lost as heat?
   
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BrianG
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06.08.2009, 01:16 PM
An important difference between a CPU and an ESC is that a CPU actually does work. An ESC simply channels battery energy in a controlled fashion to the motor, which is the part that does the work. The heat in an ESC is only caused by FET switching losses and the rdson value of the FETs. Over time, this will improve as FET design improves.

Passive cooling has worked very well for me. I usually add a little extra heatsinking in an area that will be exposed to at least minimal airflow. Adding larger heatsinks works, but you get diminishing returns if they get too big.

Solid state cooling is simply too inefficient, I agree. Condensation is not really a concern as long as you keep the temp at or above ambient. I don't think anyone has illusions of running an ESC as sub-0 temps.

And water cooling... um... yeah. I'm not gonna go there either.

Running ESCs in parallel would indeed help a lot, but the cost would be too high and the controller circuits would have to be designed to do so.
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lincpimp
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06.08.2009, 01:24 PM
Water cooling works great in a boat...

HAHAHA, maybe we need dirt cooling for land rcs!
   
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