Hey guys.

I am currently looking to pick up a medusa motor to run on 4 cell lipo setup to be legal for the RC Pro Series in a newer style E-maxx which has already got the single motor setup, etc on it.

Anyway, I am wanting something that has similar KV to my Neu 1512 2.5D, and I am looking at the 36-60 V2 2000Kv motor.

Here are my questions, I hope you all are able to answer:

1. What kind of range of pinion gears do I need to use for this kind of setup to go a max of about 40 mph (looking at race speed here)? (14.8V, 2000kv) ( I am having trouble getting the gearing XLS to open up for some reason)

2. Do the medusa motors come with a flat spot already on the shaft?

3. Should I go with the heatsink version, or, the smooth can setup?

4. How much do the heatsinks interfer with gearing on the newer Emaxx, as well as say a 1/8 scale buggy?

5. Can you use the heat sinks as a clip ons (order them not bonded, just clip on as needed?


I think that is about it. Thanks again everyone!

1. 24/58, though I'd suggest picking up all the available spurs for the emaxx 3905 & jato3.3 to experiment with.
2. Nope.
3. Smooth, dont really need a heatsink, only makes gearing adjutment harder due to larger diameter motor.
4. See above. Reported temps with even the 3300kv 50mm medusas are great in a 3905.
5. Nope- they are bonded to the motor at the factory, not a loose item you can order seperately. Best to use some cheap clip-on heatsinks & thermal grease to get the maximum heat transfer if you decide you need/want some heatsinks later on.

so what does everyone recommend for a motor for the 3905 from the medusa line?

if my opinion is welcome...

first, medusa heatsinks can be bought seperately:
http://www.medusaproducts.com/accessories/heatsinks.htm
the 36mm ones are usable with 36mm motors [apparently].

second thing to notice, the traxxas heatsink has smaller fins, and thus it`s a lot easier to mount and use than the medusa one. all other dimensions are equal between those two however.
http://www3.towerhobbies.com/cgi-bin...?&I=LXJD62&P=7
i have been using those for years without any issues/interference...

the 36-60-2000v2 is a killer motor at 5s. a tad on the slow/conservative side at 4s however [it will need gearing up quite a bit]... so suicideneil got it right on with the 24/58 gearing: it should get you to 40mph approximately [with 4s and assuming 'close-to-stock' wheels/tires]...

didn't know there were even more spurs. Will have to look into this more.

Too bad there isn't more mod1 spurs that fit the tranny as I have a good selection of mod1 pinions I would like to use.

would a 36-60-2000 v2 work an e-aftershock running 5s2p A123 and a MMM? on another forum some people were thinking that even though the can is the same size as a feiago L, with the 4 pole design it should have as much torque as a XL can.

what do you guys think?

BTW medUSA takes preorders on MR-036-060-2000V2-5 and lower KV motors, expected stock may 31

I almost ordered one last night, might still get a preorder in but I need to think on it. Kinda been thinking about an E-revo so another motor is needed but I might just go with a 75mm this time, the Tekno/Neu 1515 looks pretty nice.

You can easily mod the mgt mod 1 spurs to fit the revo spec slipper assy.

WE NEED A STICKY ABOUT THIS!!!!!

Mainly as i am sick of typing this info!!!!

Here is my current setup. I need to work on an antenna mount for it. I have the 36-50 2000kv with 12/46 gearing. I just took a few passes today on the street. What are some steps I can take to keep the ESC cooler other than a fan on 4S ? it was about 95F here today and after my short run the motor was about 105F and the ESC 125F.

What are your esc settings? You could up the timing and see if that helps? From what I can gather the higher pole count motors prefer more timing. You could also turn down the punch control.

Maybe open some cooling holes in the body, and add a fan.

Nice buggy John. Do you have any airflow through your body? I used a toilet paper core to make a duct from the windshield to my motor and it did help, dont know if it was any better than just a hole though;)

That is actually a really good idea. A duct like that could really flow, especially at speed. I may give this a try, sounds good for esc cooling. Maybe make a duct tube that runs front to back, and cut out a portion so that the esc heatsink can sit in the airflow.

I just re checked the settings and found that I was running the old SW.. v.09 and now its updated to v.17 I think I will leave things set the way they are for now and see if that helped.

Rev... off....

braking at 50%
Punch control 50%
Timming normal
LVC 12.4

Also I was not running a body for the road test / shakedown.

I have a feeling the new firmware will help...