Medusa vs. CC Neu

hi,

atm i use the mmm 2200 combo in my lst2 and tt st-1.
i use 6s2p a123 cells.

if i change to a medusa 1600kv (70 or 80), will give me the medusa a better runtime or performance?
i will gear it to the same speed like now.
cc2200 give me a good performance, i dont look for more power. better runtime is more important for me.

same question for my tt st-1 truggy.
2200 is really fast, i must gear it with a 9t pinion.

[BrianG]

Well, for a given amount of output power, speed (gearing), and battery voltage, the only thing that will increase runtime is a more efficient motor. Both Neus and Medusas are very efficient, so any gains would be minimal I would think - maybe measured in seconds.

So, to gain runtime, I would step up the voltage to 6s lipo and get a motor with a kv around 1800. 6s lipo (22.2v) is pretty close to 6s A123 (19.8v) so you will gain a little there, but the weight advantage of lipo might help more. 6s2p is a pretty heavy battery compared to an equivalent capacity/voltage lipo.

i know the weight advantage for lipos.
but i love the fast charging of the a123.

[BrianG]

Well, I don't know what to say then. The only other thing I can suggest is to reduce vehicle weight somewhere. Maybe get lighter tires (can make a big difference in total weight)?

i will use muggy parts for my race lst2.
its really heavy now, 6.9kg
i think with lighter tires i can save 0,8kg.

for understanding.
if i gear it to the same speed a motor with 1600kv has no advantage to a motor with 2200kv?

[BrianG]

Not really. A setup using X voltage geared for Y speed will not gain anything by simply changing motors unless their efficiency is different.

ok, thx.
then i will use my cc.

[ZippyBasher]

Originally Posted by BrianG

Not really. A setup using X voltage geared for Y speed will not gain anything by simply changing motors unless their efficiency is different.

OK so I have been trying to get this right and I thought that I had...

He asked precisley what I was thinking; I got a MMM and a medusa 36-70-1600 to run 6s geared for 45, instead of getting the CC 2200kv Combo (on 6s, geared for 45) because I thought it would be a "more efficient setup". Of course the CC Combo would be geared lower, and the Medusa geared higher to net the same speed but the major factor for me would be the medusa is spinning 35,000 rpm to reach max speed, while the CC neu would be spinning at nearly 49,000 rpms. I was under the impression it is to have a "sweet spot" to get the motor at the prevent bearing stress and a hot motor...

Anyway I already took the dive on the Medusa and had a first run today, it was a blast about 25 minute run and the motor got to about 145 after it all. But maybe I could get the CC Neu from mike and have Deuce,.. Lemme know what you guys think

[lincpimp]

I would say that a lower kv, like 1600, for larger motors such as the 1521 and 80mm medusa is the way to go. You get more torque from the longer motor, and lower motor rpm generally leads to better temps, and increased component life.

Now you may want to stick with a higher kv for a smaller motor, as the increased rpm will help out with less torque. This assumes you are running the motor in a heavier MT.

I run hacker c50 xl motors (longer than a 1515, but not quite a 1521) in 10 and 11 turns. Those are both near 1600kv, and work well in my heavy lst2. I have a 1521 to test as well, just waiting on some hex pins for the 20mm hubs so that I can run taller lst2 wheels/tires. And some al knuckles too.

hmm, is anybody here who can check the cc against a medusa 70 or 80 with 1600kv?

[lincpimp]

Originally Posted by Burnsi

hmm, is anybody here who can check the cc against a medusa 70 or 80 with 1600kv?

Check for what? The CC motor is a good 4-5 motor. A 1600kv medusa 70mm motor on 6s should have similar performance to the ccneu if you run it on 4s. 5s on the ccneu will make more "power" due to higherr motor rpm (if you gear down for the same speeds).

A medusa 80mm will have more torque than the 70 or ccneu, and is a better choice for a heavier vehicle. So it will handle more load and put out more power.

IMO, the 80mm is the best bet for a lst. The 70 and 1515 are a bit small. They are good for lighter trucks such as emaxx and erevo. Even a savage is lighter than a lst. I generally go for a longer motor as they will run cooler, and my battery choices can keep up with the increased demands. I am going to a 1521 for the lst I have, just cause I want 45+ mph speeds.

[traxxasrevony]

im thinking about getting a medusa 80mm 2200kv for my converted revo.
im sending my mmm back this weekend so i still have some time to decide what motor i want to get.

Do you think this motor will work good on 4s8000k maxamps packs?
ill have it geared at 22/38 running with the standard 2 speed tranny.

this in theroy would give me 40 mph in first gear and 55 in second gear.

just looking for some input on this setup vs a compareable cc neu