Brushless Advice
 

Hey.

I am deeply wanting a brushless now but still unsure with one thing.

I have a "Triton" charger that can do upto 24 cells so no restrictions there! :D

My chassis is using the older version of Gorilla and can hold 16 cells flat, I moved from stock because I had to use the "hump" formation and a pack fell out and snapped!

I would like to try 16-18 cells but this would mean the "hump" again. So I worry it could happen again, having 18 cells would mean I could have a cell on top each end of the pack so the straps will hold both ends down, with 16 only one side would have a cell on so I have a slope where my strap is - any DIY tips or products that would make it more secure? I wonderd if just foam carved to the correct shape to go in the gap would work?

Would the 9918 comfortably run 16-18 cells or am I pushing it?

I'm not a weight person and don't have scales so hopefully you can give me an idea how much my truck weighs and what sort of brushless motor it needs to be pulled. ;)

I am looking for more speed than torque, although a good balance in between would be a treat. ;)

Picture of my Maxx here:
http://www.msuk-forum.co.uk/index.ph...cmd=si&img=458

I have some more parts on the ready (CVDs/Differentials/Driveshaft) too. :)

Many thanks,
Nick.

The 9918 can take the cell count, as long as a motor is properly selected. I have a couple of the old style chassis myself! They only fit 7 cells per side, but I don't run more than that anyways (when I run nimh!). I double up on the straps also, to hold the batteries more securely. The 10L or 7xl on 16 cells is a very nice setup. As for speed vs. torque - you are gonna get both - no way around it!

Thanks Mike.

I like the look of a 9918 with 7XL on 16cells. :)

7XL the Lehner?

Right, its the Feiago - so what differences between the 10L and 7XL? :)

The 7xl will be a pretty sweet motor on 16 cells. The Lehner motors are more expensive (especially the regular ones-not basic or basicxl), but the quality of the Lehner motors is top notch. I prefer the Lehners, myself.

The "l" is a little faster and a little shorter given the same gearing. If your truck isn't a "tank", the 10L would be my preference.

Great info' Mike. :)

What Lehner would you reccomend on 16 cells? I would be willing to pay extra if performance is noticable.

What is cogging like with these brushless motors also, I have had a go on a 1/18th Mamba 8000kv and it was pretty bad - don't know if you could use that as a comparison?

the cogging is not noticeable unless you are way overgeared. The basic xl motor for 16 cells would be the xl2000 or xl2400. There are higher end motors as well, which would be the ultimate in power/performance/efficiency, but these are very pricey!

You can't use the mamba as comparison.

Depening on the software that is on the controller, and the timing, and the startpower and the batteries, it varies a lot.

And besides that, the mamba 8k is used in small, light and nervous cars..

The biggest difference between the high end leher motors and the feigao's are efficiency. (smallest difference though, i personally doubt if you notice it in runtime and topspeed, besides a some hotter engine.)

There will be no difference in cogging with these motors, they are based on the same principle. (2pole, with no magnetic preload) (unlike a 4pole plettenberg)

The 7XL has got a 50% larger rotor than the 10L, (45 vs 30mm)among with that comes a huge amount of torque. Be sure your drivetrain can stand this.

I don't know how fast your want to go, a friend of mine uses a 10L on his 14.3lbs heavy savage and on 15 cells he got a 70.4 km/h topspeed.. (44 mph) and 16 cells is about 100 watts of more power for your motor.. (and the maxx is much lighter as well)

Hope this information is of any good.

As Serum said, the major difference is in the heat. the higher end motors are more efficient at partial load conditions. Most wouldn't know the difference by driving them.

Thanks.

So at the moment I am looking at the 10L or XL2000/2400.

I still can't understand the differences in motors. :S

I'm guessing the 2400 draws more torque than the 2000?

I think I will go with the 10L - looks the easiest option. :P

THe 10L will have got the most torque. (of all three latest called options)

The 2400 will give you a shorter runtime than the 2000, because it simple takes more energy from the batteries. The 2400 will be faster, and has got about the same torque as the 2000

Do you want to race your truck or is it for recreative bashing/speedrun use?

Bashing/Speedrun.

I want something good on grass, open fields and quick on jumps. With good run time.

What run time will I expect with 16, GP3300s on these motors?

I already think Titans have enough torque, so I guess I am looking for a speedy motor as probably any brushless has more torque than Titans. :D

The 10L would be the overall winner.

Brushless has got sooo much more power. (on the same amount of cells)

And your are also running on more cells too, so that would be even more powerfull.

Runtime will be about about 15 minutes

The 10L on 16 cells will be quite powerful, so you will need to be ready on your first run. As Serum said, there is a huge power increase from the titans to this setup.

10L & 9918 it looks like then. :D

Thanks alot, just need to order another pair of cells and an extra 2 to jump to 16. Then some differentials/CVDS and stuffage.

UBEC too, I heard this can cut runtime? But then I really can't be botherd having more cells in my truck to power things.

Can't wait to go Brushless, know someone who thinks hes unstoppable with a 18.97KWF and Hacker B50(10L) on 16 cells - now I can compete. :D

Ubec doesn't take that much. you probably won't notice it.

are you planning on mixing used cells with new and unused cells?

I will be buying a new pair and make a fresh 2x 8cell packs (3600s).

Then buy 2 more new cells to go on my current used 3300s.

None are matched.

*Update*

I have thought about a brushless setup further, and thinking of just a 14 cell setup instead of 16, my reason being a want rid of the hump pack, to avoid batteries falling out, which I truely think is the problem and don't want to discuss that in this thread again, lol.

Is it possible to get the same sort of performance of a 10L using 16 cells with 14 cells and a different motor?

Or should I just go for the basic 9L?

The 9L on 14 cells will be similar to the 10L on 16 cells. The 16 cell setup will always have potentially more power, but with the same gearing, the 9l and 14 cells would be right there with the 10L and 16 cells.

Whats the Lehner equivalent? How would it be in comparison to the 9L?

The 2800XL is the closest to the 9L. The 2 are pretty much identical, but the lehner is more efficient (maybe a tiny tiny bit quicker).

Xl2400 or xl2800 would be in the same power output range. The Lehners get a little better runtimes ans slightly faster acceleration, but the performance is very close.

You mentioned the XL2400 for 16 cells too, is this faster than than the XL2800 then, or more power?

The xl2800 is fatser, given the same cell count and gearing. the 9L under load would perform somewhere in between these two motors.

I guess the XL2800 is the "Basic XL2800" which you mention?
http://www.rc-monster.com/proddetail...rxl2800&cat=20

I noticed most brushless motors have 3 wires, whats the 3rd extra one for?

Yes, it is the basix XL2800.

The three wires serve other purposes than with brushed. You need three of them, to make the whole magnetic field fly around the magnet, pushing it forward. It is the princple of the Mono-rail magnetic field train. That is the reason you need a fancy controller as well.

here, check this;

http://www.serum.demon.nl/all/4-pole.gif

It is a 4 pole, but the goal of the three wires stays the same. A 2 pole brushless motor has got 2 poles on the internal magnet. (N+S)

Mike u seem very familiar with the lehner motors.
can u tell me the difference between a lehner basic and a lehner basic XL?

The basic xl is about twice the size - better for monster trucks!

the basic is nice for 1/10th cars and 2wd smaller trucks. (or a lightweight 4wd buggy)

Exactly!