diesel

Hi there, I am thinking of going brushless and here are some questions:

1) What's the difference between a controller with sensor and
one thats sensorless?

2) Will i expect a change in driving style from brushes to
brushless? Is there any difference?

3) What do you mean by 'cogging effect' of the motor?

4) Has anyone tried the U-force 75 ESC with a brush motor and
how is it compared to the normal brushed ESCs?

5) What's a good brushless motor equivalent to an 8T brushed
mod motor?

Sorry for the questions, just trying to find out more before i commit. Cheers.

kufman

iTrader: (6)

It will run the motor without load, but it has terrible start up problems when the car is on the ground. Let me know if yours works differently.

kufman

iTrader: (6)

Sensored controllers always know the position of the rotor and never stutter or "cog" when the motor starts up from a dead stop. Most of the modern sensorless controllers don't have a problem with this. The Schulze U-Force 75 and most motors works very well.

Brushless tends to roll more than a brushed motor so you may feel the need to add some drag brake to make it feel more like what you are used to.

#3 was answered in #1.

I own one but I haven't tried it yet.

Plettenberg Shadow, hacker c40-7t or 6t, maybe some fo the lehner 15 series with Kv ratings around 6000 rpm/v. You can also use larger mtors and gear them to use the torque to generate more speed. I was able to gear a lehner basic 4200 to keep up with 9 and 10 turn motors, so youmight be able to gear a lehner basic 5300 to keep up with an 8 turn.

Exe

ok, i did run today with novak and uforce 75. coggin is really hard but it does not affect as i drive on carpet, as full trotthle is my friend

diesel: i don't know how hacker motors run, but they have about 700watts, the lehner basic xl5000 i own is 1300watts , maximum of course... and is extremely smooth without any coggin , just pure extreme power! haven't seen anything faster than this motor. you can't go wrong with this motor!

diesel

Thanks guys for the quick reply and valuable info. Looks like the Schulze U-force 75 and the lehner are the way to go.

Are there any other speedies comparable to that of the U-force 75? Something lighter for my wallet perhaps?

RCknight

iTrader: (5)

some info about their new brushless. I hope they are making a smaller speedo. I would love to run one in a 12 scale with 3800s. That would be great! Any one read/hear anything? The one they are working on, is it the brushed and brushless speedo? I hope not. Anyway no talk about it? I can't wait for it.

rcgen

I just ordered a Novak SS+ with the 5800...I am assuming it is the same size of the original. I'm upgrading from the Novak bl 4300 to the SS+. Now I can leave the speedo in and run any class without worrying about removing a speedo

Silver Cup

iTrader: (4)

I Loved my SS 5800 until the weather warmed up here.........Almost of us ran them in the HPI Super Electrics, we got pissed off when we could never finish a 5 minute race without thermalling. We tested all over the gear charts and could barely finish. We bagged the brushless and went back to brushed motors and have been smiling ever since. Miss not having to turn motors though - But definitely not worth the thermal frustration.

Exe

yup, that's the problem of novak esc, it simply cannot handle the it's own motor's power.

disel: you can get lehner warrior 7018 for 160$. but the main reason i went with uforce because timing is adjustable on
uforce and and you can really feel the difference... you can select soft soft/ soft/ medium / hard timing which corresponds to maximum torque and power at lower/low/medium/high speed. and you can always adjust to the track you drive on.

Exe

here is a clip riding my pro4 with lehner basic xl5000 and uforce75. gear ratio is 7.75, the length of the longest straight line is 24 meters.

video 6 mb here

diesel

Exe: Awesome Vid!!! Very well taken. Speed down the straight looks comparable to an 8T brush mod motor.

Exe

the interesting thing is that motor spools up immediately and almost through the whole straight it's running at full throttle... but it's extremely powerul and fast

kufman

iTrader: (6)

Unfortunately i don't know of any. I am hoping that castle creations comes out with a good car/truck controller soon. Their mini/micro system, the mamba, is really good.

kufman

iTrader: (6)

What gearing are you running with that setup?

For indoors and my lehner basic 4200 I run 72/26 and with my shadow I run 72/22 in my TC3.

How hot does the controller get?

Very nice video.

Exe

in the video it was close to 8 gear ratio. but something shuts off after 4-5 mins of intense run... probably heat, but esc is not really hot... i don't know if it's the motor or esc, sent an email to schulze about that...