My BL Savage

[jordan...]

Looks real good, ive been watching this thread and can't wait to see this finished product, should be really awesome

One question, what difference is there between running a 1527/1D (2300kv) on 6s and a 1527/2D (1150 kv) on 12s. They'll both be running the exact same rpms, will one get more runtime or pull more amps or something??

cheers
jordan

Originally Posted by jordan...

Looks real good, ive been watching this thread and can't wait to see this finished product, should be really awesome

One question, what difference is there between running a 1527/1D (2300kv) on 6s and a 1527/2D (1150 kv) on 12s. They'll both be running the exact same rpms, will one get more runtime or pull more amps or something??

cheers
jordan

Thanks! I can't wait for it to be finished either. I'll have it before the year ends if I want to fulfill my New Year's resolution (which I very much do, :) )

From what I know, (which isn't much compared to a lot of people on this site) the more volts a system runs, the more efficient it is. I don't really quite know why, but I think it is because a higher voltage system will pull less amps, causing reduced heat and less power loss. Also, (from what I know) in order to get the same performance, the 1527/1D running on 6s would require the batteries to provide more amps, so to match the performance of the higher voltage system, you'd have to run 6s2p. There is also the matter of watts, too. If the 12s setup pulls 100 amps, and the 6s setup pulls 100 amps, the 12s setup will provide more power. Granted, the two motors probably wouldn't pull the same amount of amps, as far as I know. Maybe somebody else can clarify for you as I'm not 100% sure on most of this, haha.

I also just like running Higher Voltage setups because they are a bit more unique.

[lutach]

Originally Posted by jordan...

Looks real good, ive been watching this thread and can't wait to see this finished product, should be really awesome

One question, what difference is there between running a 1527/1D (2300kv) on 6s and a 1527/2D (1150 kv) on 12s. They'll both be running the exact same rpms, will one get more runtime or pull more amps or something??

cheers
jordan

The higher the turn on the motor the higher the torque. A HV set up will run more efficient and will require less AMPs to produce the same power the 6S set up would.

One example is, if you want 3500 watts out of both set ups this is what you need to do:

3500/22.2=157.66A (You'll need 157.66A to make the 3500 watts)
3500/44.4=78.83A (You'll need 78.83A to make the 3500 watts)

AMPs is the cause of heat, not voltage. So by lowering the AMPs used, you'll also lower the temps and make for a very long lasting set up. Too bad ROAR can't see the benefits of it.

[BL_RV0]

Here's what I gather about the good and bad om amps (very basic but typically true):
More amps: more power on less voltage, more heat, less runtime.
Less amps: same power on higher voltage as hi-amp low voltage setup, less heat, more runtime.

[lutach]

Originally Posted by BL_RV0

Here's what I gather about the good and bad om amps (very basic but typically true):
More amps: more power on less voltage, more heat, less runtime.
Less amps: same power on higher voltage as hi-amp low voltage setup, less heat, more runtime.

True, but we need to add battery capacity into the mix. Let go with 4S since that's what the racers are using. They'll need 5000mAh+ to get a 15 minute main done. With 6S you might need 3300mAh+ to get there. Now I'm going to try 8S and 10S and I might only need 2200-2600mAh.

[BL_RV0]

Oops! I forgot. You can actually end up saving weight with the lower mah batteries.

[lutach]

Originally Posted by BL_RV0

Oops! I forgot. You can actually end up saving weight with the lower mah batteries.

Yes. Most people will also drag the price issue, but when it's all said and done, the price will be somewhat equal.

So, I am going with the brakes on the front diff idea, and I'm pretty sure that there is no kit for the savage. Does anyone know of a 1/8th scale buggy/truggy that has a brake on the rear or front diff? I recall seeing it on a buggy, but I forget which one, and searches aren't turning up with anything. Also, will a single mech brake on each side be enough, or should I go with 2 on each side, so they don't fade as much?
Thanks.

Edit:
I see now that it is on the LRP Buggy, and the brakes on that buggy looks pretty good, too. I may have to end up floping the whole design the other way around, and putting the brake on the rear diff though, because I'm not sure if I can clear the steering bellcranks...

[lincpimp]

Originally Posted by lutach

Yes. Most people will also drag the price issue, but when it's all said and done, the price will be somewhat equal.

My 8s lipo setup for my savage with the 14xl cost 120 bucks new. I use 12c 3600mah polyquest cells. Can beat 35mins with hard bashing, and even the motor will stay under 150f. All I can say is that hv is great. Can you imagine what a 4s pack would cost to do this? At least double...