Best motor for me?

[ReV:-O]

Heya,
I'm converting a Hyper 8, and i want to do speed runs to make it achieve 90+mph.

I currently have a MMM 2200 combo, but I want to get a better motor. The reason being is, I run on 6s which is fine for the 2200kv motor, but I need a higher kv motor to achieve higher speeds, for example the Neu 2700kv motor. But running 6s with this motor will put it well past its 60,000 RPM limit.

So basically what I am asking is, what motors have an RPM limit greater than 60,000? I'm kinda thinking along the lines of plettenberg bigmaxximum, although I really know nothing about these. I will be running it with the MMM.

Cheers for any help given!

[BrianG]

6s on a 2700kv motor puts the rpm at just under 60k rpm actually. I would't go much higher than that though as motor efficiency falls quickly. Just gear up a bit. And don't forget; that max rpm will only be realized for a relatively short amount of time when you actually reach the target speed.

No matter what, speeds like this is going to be expensive. It requires a lot of power and the chances of burning something out is much higher. If you still want really high speed runs, expect to have a failure or two.

[ReV:-O]

22.2x2700 = 59940RPM
25.2x2700 = 68040RPM

Your right in saying that it doesnt reach 60,000, but I don't wanna push a Neu motor till it cracks. Thats why I want to find a motor that has a higher RPM limit than 60,000.

Also, money is no object.

[BrianG]

lol, first of all, at the current levels you will be pulling to achieve those speeds, the lipos will not be 4.2v/cell very long at all. And second, rpm limit is determined by the motor bearings, how the rotor is built, and to some extent, the ESC.

Use high quality bearings and make sure the motor you pick has a wrapped rotor and you should be fine. At ~60k rpm, anything can go wrong no matter what brand it is.

IIRC, the Pletty is a 6 pole motor. I'm not sure what the MMM ESC is rated for rpm-wise on a 6 pole motor. As far as which motor can rev higher, I can't say. I know Nic Case uses Neu motors and routinely reaches those rpm levels and they hold up.

[coolhandcountry]

You may consider looking at this thread and seeing what he has done.

http://www.rc-monster.com/forum/show...422#post333422

[Rivermaxx]

At the ISC event I saw Nic Case hit 129 mph on 3s with a neu motor and a castle mmm in a pretty much stock 10th scale car. He told me to use 3 volt per cell when using brians calculator because of resistance and other losses. I believe His method is pretty acurate. I am finding out for speed runs that bigger motor is not always better. With a 15151.5d 2700 kv I had too much power and had issues with traction when I was on it. Nic said he couldnt believe I was running that big of a motor. He said I was probably putting out more than 5hp. BTW I burnt up 2 mmm esc's and had one faulty one. Expensive venture but I had fun doing it.

[ReV:-O]

would the new tekin motor or a Hacker motor have a higher RPM limit? Could I possibly use a helicopter hacker motor?

[stum]

I have run a Neu 1.5d on 6s before.. I bashed with it out back and did speed runs.. LOL you won't hurt it with a 6s lipo setup. As Brian said I wouldn't push beyond that and make sure you have good lipo's.. hyperion 35c or similar.. that 1.5d draws some BIG AMPS :)

[ReV:-O]

on here it says the hacker can go up to 60,000 - 80,000 RPM

http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT

and on here it says the plettenburg Maxximum can go up to 70,000 RPM

http://www.plettenberg-motoren.com/U...MAXX/motor.htm

[suicideneil]

RPMs isnt everything- a larger motor can pull taller gearing, and happily, where as spinning rotors too fast can lead to premature failure sometimes.. Stick 6s to a 1515 1y and it'll go plenty fast, or maybe even the new 1518 and gear it taller on 6s, really push the limits..