mah and runtime for racing 1/8 Buggy?

[mtucker]

Unless your system is much less efficient than mine, you should have no problem making the 15 minutes.

You 5S pack has more energy storage than my 4S pack.

3.7V/cell *4 = 14.8V, 14.8V * 5AH = 74 Watt Hours
3,7V/cell *5 = 18.5, 18.5 * 4.35AH = 80.5 Watt Hours

For the comparison to work, you need to have the same amount of power draw. Since you are using a lower KV motor, that seems reasonable as long as it is geared right.

Matt

Edit: Oh ya, that is where I saw the picture of the big 5s Enerland cell...... in your 1/8 Buggy w/ a Outrunner Motor thread. I love my Enerland 4S pack. They just get warm after 15 minutes of racing.

[jhautz]

That makes sense to me. I think I will be OK with this also, but I'm still gonna take it out for a couple test packs before buying another pack, just to make sure. Just a little to close for me to be comfortable without real world testing.

Yea, that outrunner is just an experiment. Not sure how its gonna work. Ita a 2093kv motor, but that is an unloaded value so I am estimating it will be more like 1800 or so loaded. Plus its a much smaller motor than the Nue 1512. If the outrunner doesnt work out, I have a Neu 1515-2.5D that will be going in. Thats a 1700kv motor. but slightly longer than your 1512. Im estimating that either of these will have me right around 40-43. Probably a little hot for a indoor track, but it will be perfect for the outdoor track in the spring.

[starscream]

That sounds like a fairly large track so your runtime will be significantly less than a smaller track. You'll most likely have to test your buggy with the 4350mah 5s pack to see how long you can run before it dumps.
I agree with CC, 5000Ah may get you through 15 minutes on a short track but you'll most likely need at least 6Ah for a large track.

Keep us updated as I am very interested in your results.

Thanks

BTW
What kind of buggies are you guys running?

[jhautz]

Originally Posted by starscream

What kind of buggies are you guys running?

I'm doing a Cen Matrix. Have an Ofna MBX converted, but its not race worthy. Thing breaks every time it runs. Thats why I went w/ the Matrix. Its the beafyest buggy Ive seen.:dft009:

[jhautz]

[

Originally Posted by starscream

That sounds like a fairly large track so your runtime will be significantly less than a smaller track. You'll most likely have to test your buggy with the 4350mah 5s pack to see how long you can run before it dumps.
I agree with CC, 5000Ah may get you through 15 minutes on a short track but you'll most likely need at least 6Ah for a large track.

So you mean the average amp draw over a timed race will be higher on a large track vs a small track? Not sure I understand why. I am thinking that the highest amp draw is the first few seconds after hitting the throttle. And then under hard braking. I would think that there would be more frequent throttle stabbing and hard braking on a small track vs a large track.

What am I missing?