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You probably don't need a fan in a Monster Beetle, but these ones are great.

https://www.banggood.com/SURPASS-HOBBY-ROCKET-28000RPM-Motor-Esc-Fan-For-18-110-112-RC-Car-p-1349628.html?rmmds=buy&ID=228&cur_warehouse=CN

As for the receiver, it depends.  Some ESC's have a socket you can use, otherwise the rx is the easiest way to get power.  I have seen people attach them to the ESC power cables, so the fan gets full voltage and will run when the ESC is switched off too.

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Why DO you need a fan? Chucking fans on stuff is relatively recent.

With the GT12 racing we sit the cars on a fan after the race to cool down asap to prevent weakening of the motor magnets, I suspect its just more weight to lug around for most people, and a nice little profit for WISH or BANGGOOD

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16 hours ago, Clodbusterfan said:

Why dont I need a fan in a Monster Beetle?

Monster Beetle has a very low gearing of 37:1 when most buggies have 9:1 ratio.  I would say Tamiya was very cautious when they were designing ORV back in the 1980s.  I've run Blackfoot with the same gearing all day long on Sport Tuned.  It would only get warm.  If, however, you were  to run 3S (11.1 volt), it would definitely heat up.  You can use a fan, but the motor is likely to seize up at that voltage.  

Most mortals use 7.4v.  If you are using motors like Sport Tuned, GT tuned, or super stock motors, you would be okay with a heatsink.  At burst speed, the temperatures would go up to 50C, but it will quickly drop down to 40 degrees in 20-30 seconds.  If you are running a faster 12 turn motor at 8.4v, a fan would be useful.  But heatsinks do fine with 21-27 turn motors at 7.4v.  

You don't need the 3rd channel either.  I'm not 100% sure, but you might use "Batt" slot to draw power if you have an older receiver.  Or you can simply plug it to an extra slot on your receiver (receivers often have more channel slots than the transmitter transmits). 

If you happened to have a 3 channel radio, there is an option of turning on the fan remotely.  You'll need a special switch for that, though.  It plugs in like a servo, but all it does is turn the power on and off on that channel.  People use it to turn on the LED lights but it should work for fans too.  

BbhLygB.jpg

https://www.ebay.com/itm/Apex-RC-Products-RC-Remote-Electronic-AUX-Channel-On-Off-Switch-9025/222890439807?_trkparms=ispr%3D1&hash=item33e54e347f:g:GvAAAOSwxdtasAbT&enc=AQAFAAACYBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkgCVySCgrNFPU8Iu85TabMJaH69Rj3sM9GSmEhCel6uQNocgLdta1ppUgBAb3r%2Bvlxrg3PCiT7zNLhjlrjFqkLhxrNFrYs4IFJ6aiH2yGIyWel0e5e60ItKfQhs9YlZ3dvh5mV57IjxVLcVZfUW7tan30RQ841FVOw%2FyM59jXwQzWK9BIznVZMtlhnJeulcvDNMNJGvSLS02bI%2B6GIsnaZghkOOWdLMbpyKKim2gy%2B6wB%2FWKJdRyIml6ZX1omx1AVd6QdRCNAMPYfIrNgBXay%2FM5e7V1uzdMe%2BqQT8SAWdY3OtDGB8cIzn%2BAi3k0uiNpSmUPl4bOrigFe%2Fg2E3witoTiRhItRMtiKMQjvBd15JILrjGYObSwgfqaOPFbNLahJ%2FT2YCKeyFaP5q8sfRa1%2FuSdYl2Lk5to3W%2BYSMjG8fpg%2Fd0VChQlf1t46ALRapEa4%2FdIXyiN2AJ78z4CEzhQM9FAdgA%2BKFrR2%2FAs7AB4H7cd%2F2UCgnxKpRvCVLzyK4H%2FIBVVOdmh%2Bn8eUQmmzUZy9h%2BHsgnthcL5AOh7UnZauocVQnPx3IfYimwmLF6A5QEtyNRH2k4Sw7LYLmHnBo6ki99oFEyIXZFJnIp719qGmNqhpoEH89ENKyg%2B6Qdry6OxHHX2j98V1IHau7DU6iLidVZO2ntPfKRFiHpl4dlOplyCfoRBcXLAgRpb0OTTJrDmlOqv0fdicq9vjwGQw0vrolSJf8K1M%2BYWaG16QmXUCqkHUT%2BH5X%2BrKWqjKBdvTwBrp&checksum=2228904398072d1049763b0647cf95150da5bac1f3d9

 

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