How to install Hobbywing frameless fan for Max8?

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Atomic Skull

Atomic Skull

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Anyone know how this thing is supposed to install?

https://www.amainhobbies.com/hobbyw...less-cyclone-cooling-fan-hwa30860108/p1434333

HW claims it's an upgrade for the stock Max *'s ESC fan but I cannot see how it would install. The stock 30x30x10 fan sits under a plastic shroud that goes over the top of the ESC.This thing has the wrong number of screw holes and I cannot see how it's not going to be held in place so the blades don't interfere with the housing.

I've looked around and there is ZERO information about this anywhere even on Hobbywing''s own website.
 
Atomic Skull said:
Anyone know how this thing is supposed to install?

https://www.amainhobbies.com/hobbyw...less-cyclone-cooling-fan-hwa30860108/p1434333

HW claims it's an upgrade for the stock Max *'s ESC fan but I cannot see how it would install. The stock 30x30x10 fan sits under a plastic shroud that goes over the top of the ESC.This thing has the wrong number of screw holes and I cannot see how it's not going to be held in place so the blades don't interfere with the housing.

I've looked around and there is ZERO information about this anywhere even on Hobbywing''s own website.
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It’s upside down in the pics the shroud comes off and it just screws on, I’ll try take pics of mine, but if want to upgrade the fan just fit a 30mm fan on top of esc.

IMG_8080.webp
 
I'm not picturing how you screw a fan with three screw holes onto a fan mount that has four.
 
The screws go in between the heatsink ridges, so you basically anywhere on the heatsink.
But I’ve never seen that particular fan in your post.
 
My max8 came with it installed but wouldn’t consider it an upgrade personally, I’d add fan on top of the esc if want to upgrade it. I buy them in bulk cheap as chips

I just found this on AliExpress: ￡26.94 | 5Pcs YSIDO Hight Speed 4010 3510 3010 Cooling Fan Heat Dissipation for Hobbywing Traxxas ARRMA 4268 4274 1/10 1/8 1/7 RC Car
https://a.aliexpress.com/_EQe84Ua

IMG_8082.webp


IMG_8084.webp
 
Nelson.81 said:
My max8 came with it installed but wouldn’t consider it an upgrade personally, I’d add fan on top of the esc if want to upgrade it. I buy them in bulk cheap as chips

I just found this on AliExpress: ￡26.94 | 5Pcs YSIDO Hight Speed 4010 3510 3010 Cooling Fan Heat Dissipation for Hobbywing Traxxas ARRMA 4268 4274 1/10 1/8 1/7 RC Car
https://a.aliexpress.com/_EQe84Ua
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I'm pretty sure now the Max 8 G2 (which I have) comes with the frameless fan stock. According to Hobbywing's chart it was optional on the older version Max 8.\

EDIT: ESC temps are getting too high so I'm going to pull the ESC controlled fan from under the shroud and replace it with one of these: https://www.aliexpress.us/item/3256801740180231.html and connect it to the BEC so it just runs full blast all the time 28000RPM @ 8.4v
 
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Sandracer_NL said:
Those Rocket fans move a lot of air👍.
Only downside is the noise; everyone will think you are running a drone inside your car.😄
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So I checked with a multimeter while the ESC fan was running and I discovered that the fan port on the Max 8 is the same voltage as the BEC, which means if you set the BEC to less than 8.4v it cools less (EDIT: although it's possible that the stock HW fan runs at the same RPM regardless of input voltage). It also means you can put a better HV fan in there and just connect it to the fan port so long as you're running the BEC at 8.4v
 
Atomic Skull said:
So I checked with a multimeter while the ESC fan was running and I discovered that the fan port on the Max 8 is the same voltage as the BEC, which means if you set the BEC to less than 8.4v it cools less (EDIT: although it's possible that the stock HW fan runs at the same RPM regardless of input voltage). It also means you can put a better HV fan in there and just connect it to the fan port so long as you're running the BEC at 8.4v
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Your bec controls voltage to servo & the esc. I don’t like running my servo’s above 7.4v to save them burning out but each to their own.
 
Nelson.81 said:
Your bec controls voltage to servo & the esc. I don’t like running my servo’s above 7.4v to save them burning out but each to their own.
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HV servos are designed to handle a fully charged lipo receiver pack. If they can't handle that then they cannot be used in IC vehicles. The components are actually rated higher than 8.4v, nobody makes mosfets, regulators or passives like capacitors and resistors rated to exactly 8.4v or 7.4v only 3.3v, 5v, 6v, 7v 8v, 9v or 10v. (EDIT: I'm not mentioning voltages higher or lower than this suffice to say no datasheet I have ever seen has the rated maximum voltage for a componant listed as somthing point somthing unless it's 3.3v or less). This is why for example FrSky gives the maximum rated voltage for their recievers as 10v and not 8.4v, because 10v is the rated maximum input voltage for the 3.3v linear regulator they use.

That said I would not reccomend running a servo above 8.4v because you have no way of knowing what the maximum actually is, it could be 9v or it could be it's designed for heat dissipation at 8.4v and going higher could overheat it. However if run off a 2S reciever pack (which was the original intent for HV servos) they are going to be getting 8.4~7.4 for part of the runtime because 8.4v is the voltage of a fully charged lipo or li-ion battery.
 
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lol like I said each to there own, I like having my fans & lights running @8.4v but not my servo that’s why Ive got a separate bec controller for mine run of a separate battery

IMG_7693.webp
 
I come from large R/C helis where having a separate BEC on a receiver pack is seen as an additional point of failure and you either use the ESC SBEC for simplicity or a separate directly wired receiver battery for ultimate reliability. But the cost of a receiver voltage failure in an aircraft is a lot more serious than it is on a surface vehicle so you have to be paranoid.
 
I don't like running more than 6v through my servos either - which is probably why my servos last forever. Ditto for servos in my aircraft.

All my current servos are able to handle 8.4v - but I choose my servos based on their spec at 6v.

My choice of receivers are Futaba FASST R603FS, which are not rated for use above 6v.

This is why I tend to buy very high quality servos, such as AGF 81BHMW, Protek 170SBL/TBL - then use them well within their comfort zone.

Buy right - buy once. 👍
 
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