What motor???

[rcoverboard]

I have converted my Hyper 7. I have a MMM V3. I will be running 2 3s 5000mah lipos in series. I am looking at the Medusa motors. I need to know what would be the best hoice for me. I need this thing to have alot of speed.

I would love a neu, but I can't afford it lol.

[BrianG]

Define "a lot of speed" because that makes a big difference.

Normally, I'd say a Medusa 60, but that would be for typical 35ish mph gearing. If you want high speeds, step up to a Medusa 70 or even 80 motor for the added torque (I'd go with the 80).

Then, just pick the kv that will yield ~35-40krpm at the battery voltage you plan to run for speeds around 50mph.

If this is for speed runs over 60mph, pick a kv that will yield ~45k rpm. Yeah, the rpm is a bit higher than normal, but you may need those rpms.

[rcoverboard]

Well, I need enough speed to be able to jump a B52.

I am not sure how to calculate the RPM to Kv, verses voltage.

[BrianG]

So, around 60mph then?

total rpm = voltage * kv.

So, if you need around 35000 rpm and are running 4s lipo , that would be a kv of 2364. (35000rpm / 14.8v).

[rcoverboard]

So for a 6s I should probably run around a 1600Kv?

[BrianG]

Yep!

[rcoverboard]

So the MR-3670-1600V2SE-5 is the way to go for the insain speed that I need?

I better hide this purchase from the wife lol.

[speedracer1129]

Originally Posted by rcoverboard

So the MR-3670-1600V2SE-5 is the way to go for the insain speed that I need?

I better hide this purchase from the wife lol.

If you are looking for insane speed, you need to figure on the 60k limit as it will drop under load. HOWEVER, you will not have runtime!!

[BL_RV0]

Originally Posted by rcoverboard

So the MR-3670-1600V2SE-5 is the way to go for the insain speed that I need?

I better hide this purchase from the wife lol.

Or a 36-60 if you don't want to wait.

[rcoverboard]

What kind of run time would I have with a 5000mah 6s on that motor?

[rcoverboard]

What would I loose or gain by going with the 36-60?