8XL on 12 cells, as powerful as 8L? - RC-Monster Forums

Rtsbasic · **8XL on 12 cells, as powerful as 8L? -** 03.29.2006, 06:40 AM

Just to satisfy my curiousity, would an 8XL on 12 cells be able to hit the same top speed and have the same acceleration as an 8L on 12 cells? The longer can would take care of the heat problems I am having with the 8L in theory but I don't want to loose any power. The 8XL would be nice beacuse I can run it on 16 cells in a few months.

Thanks.

03.29.2006, 07:15 AM

with the 8xl you will be able to gear higher and get the same speed and acceleration as the 8L

Sylvester · 03.29.2006, 07:36 AM

gearing it higher will not make acceleration faster, so in theory youll get same topspeeds just not the quickness off the line as the 8l.

Rtsbasic · 03.29.2006, 07:51 AM

It has virtually idential resistance to the 8L and can pull the same number of amps according to them feigao rating charts, does this not mean it will be able to pull enough amps to accelerate hard with the steeper gearing for the same top speed as the smaller more revvy 8L?

coolhandcountry · 03.29.2006, 07:58 AM

I have a video of a 9xl on 12 cells if you curious of what the performance looks like. It is in rcpics. I think the 8xl would do better in my opinnion. I have seen a 8L on 12 cells. I have not ran but a 7xl and 9xl though.

maxxdude1234 · 03.29.2006, 09:33 AM

In theory the two motors will perform exactly the same if geared for the same speed. Acceleration and top speed will be the same. The only difference is the 8XL gets the majority of its power from torque, whereas the 8L gets power from rpm. Basically, power = torque x rpm.

Definately go for the 8XL over the 8L

Rtsbasic · 03.29.2006, 09:59 AM

Is there anywhere you can purchase bigger than 20t pinions? 32 pitch 5mm ones that is. Mike only has up to 20t, with 20/66 and stock tyres thats barely 30mph, I'd like to gear a bit higher than that if possible.

coolhandcountry, I couldn't find a video of you running 12 cells in your rcpics account?

maxxdude1234 · 03.29.2006, 10:08 AM

Why not use a 7XL, would be a better option for 12cells. I believe kershaw designs stock a wide range of pinions, pricey though

GriffinRU · 03.29.2006, 03:21 PM

8XL is more powerfull then 8L
800W vs 1200W
And do not be confused with motor resistance, it is the Kv parameter which is important!
Artur

maxxdude1234 · 03.30.2006, 08:19 AM

True, but its unlikely that 12cells packs will be able to ship out 1200W continuous. It'll be a push to get 800W out of them too.

SpEEdyBL · 04.01.2006, 02:42 PM

The xl motors are more powerful because they can handle more cells. Otherwise, two motors with the same resistance regardless of their sizes will have the same power at a given voltage.

GriffinRU · 04.01.2006, 04:16 PM

Quote:

Originally Posted by SpEEdyBL

The xl motors are more powerful because they can handle more cells. Otherwise, two motors with the same resistance regardless of their sizes will have the same power at a given voltage.

Are you sure about that?...

Artur

coolhandcountry · 04.01.2006, 04:14 PM

The xl will have more torque at the same wattage. It will have more power accually.

maxxdude1234 · 04.01.2006, 04:23 PM

Quote:

Originally Posted by coolhandcountry

The xl will have more torque at the same wattage. It will have more power accually.

How can it have more power at the same wattage? Power is watts! Yes, it will have more torque at a given power output, but that second bit makes no sense.

GriffinRU · 04.01.2006, 05:36 PM

Quote:

Originally Posted by maxxdude1234

How can it have more power at the same wattage? Power is watts! Yes, it will have more torque at a given power output, but that second bit makes no sense.

Just to be clear... Power = Torque*RPM

Both motors will have the same RPM limit, based on ESC limits/ball bearings/magnet/ballance...

So, do you still consider L an XL have the same output?

Later we can talk about cells, turns and gear ratios.

Artur