A mad brushless setup help

i agree with squee in my opinion the 1930 is the way to go with the speeds you want to get.

[jagboy]

You will definately want to go sensorless. Why do you have such easy access to the Novak and LRP stuff? If you get it at a way lowered price, you might want to just go w/ the 4.5. It definately will NOT get you to 100mph, but it would still be fun. To break into the 3 digit speeds, you need to go w/ a high quality sensorless company (lehner, hacker, aveox) and an esc that can handle a ton of amps. The 12020 could be a good one, Schulze has quite a few (though more expensive than the 12020,) and the Quark monster could probably hold its ground as well. Check out here for some links.


JB

[mmdooley]

Hey I have a Hacker c50 8s. Would that work? If so send me a pm and we can talk about it.

[Hayden]

Would the gtb 4.5 system get me to 80mph/130km/h? I have about 1km of smooth road out of sight (I’ll have to be careful)

lehner 5 turn 1930? Why not put a 5 turn 1940 in it "is bigger the better"?

Yes I can get novak, lrp and hacker I think may be some other brands too, the reason is: I work at a hobby shop and I do get them cheaper there, I know I can get navak and lrp at the moment I have to search the supplier list to see if I can get any other brands.
Our shop has only started dealing with brushless in planes and helicopters…etc but not in cars yet as everyone likes nitro at this stage so we know hardly anything about (car) brushless setups that’s why I’m building a really decent fast car to learn all this stuff, have fun, promote, race and to show.
And there is no point promoting stuff our store can't get.

I’m getting mixed answers here I’m confused I was going to get the gtb / velociti 4.5 combo is that a good idea?
Which of the hacker motors is the fastest? how do they rate their motors in order from fast to slow?
What else do I need to know about motors?
Are lower winds better?
Is more torque better?
Do I need power or rpm to achieve high speeds?
Can I just get a powerful motor with low kv and gear it for speed?

thanks for all your help :)

[coolhandcountry]

The 1940 would have more torque than a 1930 so you gear higher for faster speed. A system is only as good as the batteries pushing it. There is a thread in the forum called david vs golliath. It may help explain some things on the speed your trying to get to. The low turn means more kv.

[pcnutz]

the 1930 fits just perfect in a tc3 stock chassi, if you want to use a 1940 you will have to do a little dremel work

plus you are looking for the tallest gearing on a 1930/5 you can cram in, a 1940 would send you slower since you would prolly not find a tall enough gear to make up for the slower speeds and more torque

1930/5 would be the best choice in my opinion.

[MetalMan]

The GTB/4.5R won't take you to 80mph. 6cells/2s Lipo can only push out so much power, which is why higher voltage is needed.

[Scoob]

I think you would need at least 1000 watts output even in a light tourer. As speed increases power required increases exponentially. 1000 watts if your setup is 80% efficient would require you to pull 1250 watts from batteries. You could maybe get the efficiency up some but probably not much.

Here is an example of why 2s cannot do this.

2s=7.4v and 1250w / 7.4v = 169 amps. No battery can take that kind of draw and an ESC that could handle it would be huge.

On 4s you would still need 85 amps which is a little high. 6s would only need 56 amp which is very doable and would be easy on the equipment.

V * A = wattage pulled and W * efficiency % = wattage output from motor.

I believe this is all correct (someone correct me if I'm wrong). I'm still learning.

[coolhandcountry]

and that is why the man had 24 cells on a car to run 110 mph.

[Serum]

You are right Scoob!

You get it.. :)

[Hayden]

lol I want the motor that ran this boat, if it can run a boat that fast it should be able to run a car close to 100mph do you think?
I know he had 32 cells but i'll have to work it out, all I want is the motor now.
http://www.offshoreelectrics.com/rec...eaking_120.htm

bugger it I’ll just get the novak 4.5-GTB setup:027:

[jagboy]

Thats, as it says on the can, a 2250. This is a savage with a 2240 for size comparison: http://www.ultimaterc.com/forums/sho...9&page=6&pp=15. He got 30mph on 5s and he is planning to run it on 10s. Plus, he got the 15t and lehner makes down to a 6t, I think. Definately post a vid of the 4.5, though. I hope it all works out for ya.


JB

[Serum]

He's a user on this board too, he posted his truck.

10S can go faster than 60mph, with the right cells, 70mph is easy to reach with 10S. Time for me to build the savage...

[nl12]

I am hoping my 2240 on 8s can hit 70, on 10s I would think 70+ easy, my truck will be light though... I will find out in less than a week... come on fedex.