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Old 03-28-2013, 07:56 AM   #31
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Running both facing the motor will get the most air onto the places you want it. My concern would be that the large fans start working against each other over the top of the motor causing unnecessary extra load - try running one and then bring the other into place and see if the fans start to sound slower.

Running one facing away from the motor won't do much because there isn't really the volume of air around that needs to be guided away. There certainly isn't any airflow in the dead area between the motor and chassis.

Personally I feel the best solution may be a big fan blowing over the motor from in front, and a smaller fan blowing on the motor from behind to fill in the gap behind the motor and above the chassis.

Although having said all this, I don't even think that a fan in a TC makes all that much difference. Not so much that I can safely gear the car up compared to not running a fan. My fan setup drops the surface temperature by 20C or so, but that doesn't mean that the inside is 20C cooler. The motor just goes "soft" at 65C external with the fan, rather than 85C external without!
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Old 03-28-2013, 08:02 AM   #32
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As they must be 30mm for ROAR, what about this;

http://uk.rs-online.com/web/p/axial-fans/7588370/

It's a 30mm Sunon, 6cfm
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Old 03-28-2013, 08:35 AM   #33
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Thanks for all the replies! I will try your suggestions.
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Old 03-28-2013, 09:42 AM   #34
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I wouldn't trust ratings too much.

They are just like a Brushless's KV rating.
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Old 03-28-2013, 03:03 PM   #35
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I'm with you sosidge on the last thing!!!
IMO the fan keeps it cool yes, but if you gear up to a max temp with a fan the motor is still working hard enought to blow up, just at a lower temp... I gear it without the fan and put the fan on during the race to keep it cool and running at the same speed all race..
Again it's only an opinion as I am new to electric and racing but everything has a limit and don't think a 25x25 fan will let you push the limit much
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Old 03-28-2013, 08:44 PM   #36
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Superior Hobbies 30mm fan has been working well for me! $30 bucks though.
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Old 03-31-2014, 12:32 AM   #37
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Why all this company shows the RPM and not the CFM rating of their fan... RPM is nothing without proper airflow, I would go with fan that has CFM rated around 7-8 CFM with RPM around 7k-5k at 5V.. This will circulate more air for best efficient cooling...
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Old 03-31-2014, 02:44 AM   #38
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Quote:
Originally Posted by Jochim_18 View Post
Why all this company shows the RPM and not the CFM rating of their fan... RPM is nothing without proper airflow, I would go with fan that has CFM rated around 7-8 CFM with RPM around 7k-5k at 5V.. This will circulate more air for best efficient cooling...
Because like 'C' ratings on battery packs, it fools those who don't understand into thinking that what they're looking at is the best. 'Must be better, it has higher rpm'
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Old 03-31-2014, 03:28 AM   #39
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Quote:
Originally Posted by hanulec View Post
I think two fans is overkill ... Cause if your motor is that hot your speedo will probably thermal too..

You want both blowing at the motor. Make sure they are 8mm from the motor...
+1. Positioning of the motor fan is more important than the output of the fan IMHO. I have seen many ppl placing the fan right next to the motor and wondering why it is still running so hot

And for the record, the Yeah Racing Tornado fans are good.
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