Another Medusa question

[dadgummit]

I am thinking about using a Medusa 36-50 motor in my CEN ME16 but I am not sure what KV would be better. The battery box is sized specifically for a stick pack so that is my limitation. I have many 6-cell nimh packs that I will use and I also can use either a 3s Hyperion 3700mah or a 3s 3900mah neu lipo.

The 2 Medusa's I am considering are the 36-50-3300 kv and the 36-50-4800 kv. Both are 700 watt motors. The first question is do you think a 6-cell nimh will be able to handle the medusa? The second is looking at the following RPM's:

3300 kv
7.2 = 23,760 RPM
11.1 = 36,630 RPM

4800 kv
7.2 = 34560 RPM
11.1 = 53280 RPM

Which motor would be better all around for both battery types? To me the 3300 looks like the better choice for 3s and the 4800 looks better for the 2s but 23k rpm sounds a little slow while 53k rpm sounds dangerously fast. I could just go with a Fiegao 9S at 3943kv but I wanted to check the medusa's out, they seem like a good quality motor for the price.

Last but not least, woudl the 1/8th inch shaft hold up well or should I go with the 5mm? Problem there is the only 48 pitch pinions in 5mm I know of are soft brass.

I tried running a 6 cell GP3300 pack built in a "solderless power tube", and it could kinda handle the 4800kv medusa I have in my Rustler. I also gear the bejesus out of it though to make up for lack of top end, so current draw is probably up there (8.7:1 FDR roughly with street tires).

I think the 3300 on 3s all the time would be the ticket for pure madness. 53,000 RPM is a lot for the 4800, but the motors are rated to something like 60,000 or 65,000 RPM, so you're still within specs. The 4800 is speced to handle a max of 13v, which 3s lipo falls under.

But anyways, I vote 3300 if you plan to run 3s more than 2s/6 cell NiMH. Even if you do run the 2s/6 cell packs, you can gear way up with that motor and it won't break a sweat. Since your little Cen is lighter with smaller diameter wheels/tires, the 3300 can probably still pull some high gearing without killing batteries.

I think the 4800 on 3s would be overkill. So either 4800 on 2s or 3300 on 3s.

[lincpimp]

I would go with the 4800, and the 1/8 shaft should be fine.

[TexasSP]

Anyone know the max RPM for Medusa v2 motors? Specifically the 36x60mm versions.

All Medusa Research motors are rated for 60,000 RPM operation

Hey that was an easy 1 :)

[TexasSP]

I must be missing it somewhere, thanks though.

http://www.medusaproducts.com/motors/036-V2.htm It's on this page under the first set of charts.

[TexasSP]

ah, the area I quickly scrolled past....