Going with my Team Overkill name, I try to size the batteries to not sag too much under load. When I designed Jolt, I figured on there being a sag under spin-up load and not much when the bar was up to speed - it mostly worked out. With Sauron, I am in uncharted territory, so the team & I are going to simulate the actual performance with a high current source (lots of paralleled car batteries) and an equivalent KE load - you might want to try something similar.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

I thought about that, but I would have to purchase a motor first. And I'm doing all this to work out which one I need, and what gearing.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

So if you had a design that needed 26V@40A, and you were going to use A123 cells.

http://www.a123systems.com/newsite/pdf/ANR26650M1_Datasheet_FEB2007-1.pdf

You would use a 10 cell pack..about 2.6V per cell?
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

id be wary of that assumption considering a voltage drop that severe is only going to happen on start up and under normal load that thing will be pulling 33v worth of power.

i still think the neumotors are way to small for their power, but ill shut up and see what happens before i throw some money in that direction
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www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Once I have the drum made, I will setup a test rig and use a known motor(Dewalt). Observe current consumption, voltage, RPM, spin up time etc. Then make a educated selection of weapon motor.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

Before you go investing $300+ into one of those Neumotors, why not pick up a few of the cheap UH brushlesses and see how they perform in regards to your needs. I could buy 2-3 test candidates at different sizes and windings and it would cost less then $100 and they could help you with picking the right Neumotor. Glen seems to have had a good run with his setup so far, even though he never lasts a full 3min match
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https://www.halfdonethings.com/

Thanks Aaron, food for thought.

Still workn on things, it looks like about 1000 Joules now. Nick how much is Jolt packing? Just for a comparison and interest.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

I think last time i checked it was around 1400?
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Mechanical engineers build weapons, civil engineers build targets

Real drum(not a cad ). It needs its heat treatment done now.



Not being one not to try something new...



They look real good, apart from the 14g leads.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

I reckons your gonna find those drum teeth are too small for the size of the drum But other wise, it's look very nice. Also wondered why you ditched your A123 packs, How much did the pre-made packs cost?
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https://www.halfdonethings.com/

Trial and error maybe Aaron. I thought that too when I first looked @ it, but its waring on me.

Price? Don't ask The pack kits are good value.
http://www.modelelectronicscorp.com/
The dollar is VERY good @ the moment, perfect timing for me.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

i think the teeth are right, the diameter looks massive anyway very NOICE
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www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

These guys - http://www.trextuning.com/motors.php - have a lot of actual tests of brushless motors at different voltages and compare them by weight, power output and current consumption etc.

It probably doesnt have exactly the same motor you do, but is good reading to give you a real-world feel for the different motors and their characteristics under loads etc. They're tests are usually quite well documented for batteries and bits as well.
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Great minds discuss ideas. Average minds discuss events. Small minds discuss people

I will start more parts this week, and post info.

Darn, looking @ that I need the drum teeth to have greater clearance. Thats a bugger
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

The timing belts I ordered arrived today, and because of the small mistake I made I now need longer ones. There not to pricey, so it's not a big problem. But I will now wait for the drum to come back from hardening, before I order any more(will see the final size).

The drive pods will have some slight changes too, nothing to dramatic.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.